diff --git a/core/config/engine.h b/core/config/engine.h
index 1adab9b96f32..eac96852b30a 100644
--- a/core/config/engine.h
+++ b/core/config/engine.h
@@ -40,7 +40,7 @@ class Engine {
 public:
 	struct Singleton {
 		StringName name;
-		Object *ptr;
+		Object *ptr = nullptr;
 		StringName class_name; //used for binding generation hinting
 		bool user_created = false;
 		Singleton(const StringName &p_name = StringName(), Object *p_ptr = nullptr, const StringName &p_class_name = StringName());
diff --git a/core/core_bind.h b/core/core_bind.h
index 907f37c5faae..4d26698f9907 100644
--- a/core/core_bind.h
+++ b/core/core_bind.h
@@ -447,7 +447,7 @@ public:
 
 class Directory : public RefCounted {
 	GDCLASS(Directory, RefCounted);
-	DirAccess *d;
+	DirAccess *d = nullptr;
 
 	bool dir_open = false;
 	bool include_navigational = false;
diff --git a/core/io/file_access.h b/core/io/file_access.h
index a6cb5d9fc660..a5150010da0e 100644
--- a/core/io/file_access.h
+++ b/core/io/file_access.h
@@ -183,7 +183,7 @@ struct FileAccessRef {
 
 	operator bool() const { return f != nullptr; }
 
-	FileAccess *f;
+	FileAccess *f = nullptr;
 
 	operator FileAccess *() { return f; }
 
diff --git a/core/io/file_access_pack.h b/core/io/file_access_pack.h
index 6eee2f593d98..fe4b12aef6b3 100644
--- a/core/io/file_access_pack.h
+++ b/core/io/file_access_pack.h
@@ -64,7 +64,7 @@ public:
 		uint64_t offset; //if offset is ZERO, the file was ERASED
 		uint64_t size;
 		uint8_t md5[16];
-		PackSource *src;
+		PackSource *src = nullptr;
 		bool encrypted;
 	};
 
@@ -103,7 +103,7 @@ private:
 
 	Vector<PackSource *> sources;
 
-	PackedDir *root;
+	PackedDir *root = nullptr;
 
 	static PackedData *singleton;
 	bool disabled = false;
@@ -150,7 +150,7 @@ class FileAccessPack : public FileAccess {
 	mutable bool eof;
 	uint64_t off;
 
-	FileAccess *f;
+	FileAccess *f = nullptr;
 	virtual Error _open(const String &p_path, int p_mode_flags);
 	virtual uint64_t _get_modified_time(const String &p_file) { return 0; }
 	virtual uint32_t _get_unix_permissions(const String &p_file) { return 0; }
diff --git a/core/io/ip.h b/core/io/ip.h
index ebd944a94974..06ff8a4d70fa 100644
--- a/core/io/ip.h
+++ b/core/io/ip.h
@@ -62,7 +62,7 @@ public:
 	typedef int ResolverID;
 
 private:
-	_IP_ResolverPrivate *resolver;
+	_IP_ResolverPrivate *resolver = nullptr;
 
 protected:
 	static IP *singleton;
diff --git a/core/io/resource_format_binary.h b/core/io/resource_format_binary.h
index c80c9b0ac94a..5403168a5343 100644
--- a/core/io/resource_format_binary.h
+++ b/core/io/resource_format_binary.h
@@ -127,7 +127,7 @@ class ResourceFormatSaverBinaryInstance {
 	bool skip_editor;
 	bool big_endian;
 	bool takeover_paths;
-	FileAccess *f;
+	FileAccess *f = nullptr;
 	String magic;
 	Set<RES> resource_set;
 
diff --git a/core/io/resource_uid.h b/core/io/resource_uid.h
index 1ea44b9d06ee..0b7ffdf6d0c7 100644
--- a/core/io/resource_uid.h
+++ b/core/io/resource_uid.h
@@ -46,7 +46,7 @@ public:
 	static String get_cache_file();
 
 private:
-	void *crypto; // CryptoCore::RandomGenerator (avoid including crypto_core.h)
+	void *crypto = nullptr; // CryptoCore::RandomGenerator (avoid including crypto_core.h)
 	Mutex mutex;
 	struct Cache {
 		CharString cs;
diff --git a/core/io/udp_server.h b/core/io/udp_server.h
index 4a7546fddf2d..47f06b249025 100644
--- a/core/io/udp_server.h
+++ b/core/io/udp_server.h
@@ -43,7 +43,7 @@ protected:
 	};
 
 	struct Peer {
-		PacketPeerUDP *peer;
+		PacketPeerUDP *peer = nullptr;
 		IPAddress ip;
 		uint16_t port = 0;
 
diff --git a/core/math/bvh.h b/core/math/bvh.h
index f429ce189b48..9f6ab9f7361f 100644
--- a/core/math/bvh.h
+++ b/core/math/bvh.h
@@ -763,19 +763,19 @@ private:
 		tree._extra[p_handle.id()].last_updated_tick = 0;
 	}
 
-	PairCallback pair_callback;
-	UnpairCallback unpair_callback;
-	CheckPairCallback check_pair_callback;
-	void *pair_callback_userdata;
-	void *unpair_callback_userdata;
-	void *check_pair_callback_userdata;
+	PairCallback pair_callback = nullptr;
+	UnpairCallback unpair_callback = nullptr;
+	CheckPairCallback check_pair_callback = nullptr;
+	void *pair_callback_userdata = nullptr;
+	void *unpair_callback_userdata = nullptr;
+	void *check_pair_callback_userdata = nullptr;
 
 	BVHTREE_CLASS tree;
 
 	// for collision pairing,
 	// maintain a list of all items moved etc on each frame / tick
 	LocalVector<BVHHandle, uint32_t, true> changed_items;
-	uint32_t _tick;
+	uint32_t _tick = 1; // Start from 1 so items with 0 indicate never updated.
 
 	class BVHLockedFunction {
 	public:
@@ -801,23 +801,16 @@ private:
 		}
 
 	private:
-		Mutex *_mutex;
+		Mutex *_mutex = nullptr;
 	};
 
 	Mutex _mutex;
 
 	// local toggle for turning on and off thread safety in project settings
-	bool _thread_safe;
+	bool _thread_safe = BVH_THREAD_SAFE;
 
 public:
-	BVH_Manager() {
-		_tick = 1; // start from 1 so items with 0 indicate never updated
-		pair_callback = nullptr;
-		unpair_callback = nullptr;
-		pair_callback_userdata = nullptr;
-		unpair_callback_userdata = nullptr;
-		_thread_safe = BVH_THREAD_SAFE;
-	}
+	BVH_Manager() {}
 };
 
 #undef BVHTREE_CLASS
diff --git a/core/math/dynamic_bvh.h b/core/math/dynamic_bvh.h
index 50ec2c2b304e..74831089f3bb 100644
--- a/core/math/dynamic_bvh.h
+++ b/core/math/dynamic_bvh.h
@@ -183,7 +183,7 @@ private:
 		Node *parent = nullptr;
 		union {
 			Node *childs[2];
-			void *data;
+			void *data = nullptr;
 		};
 
 		_FORCE_INLINE_ bool is_leaf() const { return childs[1] == nullptr; }
@@ -215,10 +215,7 @@ private:
 			return axis.dot(volume.get_center() - org) <= 0;
 		}
 
-		Node() {
-			childs[0] = nullptr;
-			childs[1] = nullptr;
-		}
+		Node() {}
 	};
 
 	PagedAllocator<Node> node_allocator;
diff --git a/core/math/expression.h b/core/math/expression.h
index 9b87bdd6ec81..d43cc4091a5a 100644
--- a/core/math/expression.h
+++ b/core/math/expression.h
@@ -147,7 +147,7 @@ private:
 		bool is_op = false;
 		union {
 			Variant::Operator op;
-			ENode *node;
+			ENode *node = nullptr;
 		};
 	};
 
diff --git a/core/math/octree.h b/core/math/octree.h
index e73f8213b340..65ab9e2292e5 100644
--- a/core/math/octree.h
+++ b/core/math/octree.h
@@ -134,7 +134,7 @@ private:
 		List<PairData *, AL> pair_list;
 
 		struct OctantOwner {
-			Octant *octant;
+			Octant *octant = nullptr;
 			typename List<Element *, AL>::Element *E;
 		}; // an element can be in max 8 octants
 
@@ -147,7 +147,7 @@ private:
 		int refcount;
 		bool intersect;
 		Element *A, *B;
-		void *ud;
+		void *ud = nullptr;
 		typename List<PairData *, AL>::Element *eA, *eB;
 	};
 
@@ -156,18 +156,18 @@ private:
 	ElementMap element_map;
 	PairMap pair_map;
 
-	PairCallback pair_callback;
-	UnpairCallback unpair_callback;
-	void *pair_callback_userdata;
-	void *unpair_callback_userdata;
+	PairCallback pair_callback = nullptr;
+	UnpairCallback unpair_callback = nullptr;
+	void *pair_callback_userdata = nullptr;
+	void *unpair_callback_userdata = nullptr;
 
-	OctreeElementID last_element_id;
-	uint64_t pass;
+	OctreeElementID last_element_id = 1;
+	uint64_t pass = 1;
 
-	real_t unit_size;
-	Octant *root;
-	int octant_count;
-	int pair_count;
+	real_t unit_size = 1.0;
+	Octant *root = nullptr;
+	int octant_count = 0;
+	int pair_count = 0;
 
 	_FORCE_INLINE_ void _pair_check(PairData *p_pair) {
 		bool intersect = p_pair->A->aabb.intersects_inclusive(p_pair->B->aabb);
@@ -294,7 +294,7 @@ private:
 		const Vector3 *points;
 		int point_count;
 		T **result_array;
-		int *result_idx;
+		int *result_idx = nullptr;
 		int result_max;
 		uint32_t mask;
 	};
@@ -1265,18 +1265,7 @@ void Octree<T, use_pairs, AL>::set_unpair_callback(UnpairCallback p_callback, vo
 
 template <class T, bool use_pairs, class AL>
 Octree<T, use_pairs, AL>::Octree(real_t p_unit_size) {
-	last_element_id = 1;
-	pass = 1;
 	unit_size = p_unit_size;
-	root = nullptr;
-
-	octant_count = 0;
-	pair_count = 0;
-
-	pair_callback = nullptr;
-	unpair_callback = nullptr;
-	pair_callback_userdata = nullptr;
-	unpair_callback_userdata = nullptr;
 }
 
 #endif // OCTREE_H
diff --git a/core/object/callable_method_pointer.h b/core/object/callable_method_pointer.h
index 3cd9ad381912..577d4b9fbdd0 100644
--- a/core/object/callable_method_pointer.h
+++ b/core/object/callable_method_pointer.h
@@ -38,7 +38,7 @@
 #include "core/variant/callable.h"
 
 class CallableCustomMethodPointerBase : public CallableCustom {
-	uint32_t *comp_ptr;
+	uint32_t *comp_ptr = nullptr;
 	uint32_t comp_size;
 	uint32_t h;
 #ifdef DEBUG_METHODS_ENABLED
diff --git a/core/object/class_db.h b/core/object/class_db.h
index b8a4b3ea2ba8..5da85237430b 100644
--- a/core/object/class_db.h
+++ b/core/object/class_db.h
@@ -85,8 +85,8 @@ public:
 		int index;
 		StringName setter;
 		StringName getter;
-		MethodBind *_setptr;
-		MethodBind *_getptr;
+		MethodBind *_setptr = nullptr;
+		MethodBind *_getptr = nullptr;
 		Variant::Type type;
 	};
 
diff --git a/core/object/message_queue.h b/core/object/message_queue.h
index eaab01d0aa39..2219cdb8f687 100644
--- a/core/object/message_queue.h
+++ b/core/object/message_queue.h
@@ -62,10 +62,10 @@ class MessageQueue {
 		};
 	};
 
-	uint8_t *buffer;
+	uint8_t *buffer = nullptr;
 	uint32_t buffer_end = 0;
 	uint32_t buffer_max_used = 0;
-	uint32_t buffer_size;
+	uint32_t buffer_size = 0;
 
 	void _call_function(const Callable &p_callable, const Variant *p_args, int p_argcount, bool p_show_error);
 
diff --git a/core/object/object.h b/core/object/object.h
index b640c4e78a7d..eeef03dcb9a7 100644
--- a/core/object/object.h
+++ b/core/object/object.h
@@ -538,8 +538,8 @@ private:
 
 	std::mutex _instance_binding_mutex;
 	struct InstanceBinding {
-		void *binding;
-		void *token;
+		void *binding = nullptr;
+		void *token = nullptr;
 		GDNativeInstanceBindingFreeCallback free_callback = nullptr;
 		GDNativeInstanceBindingReferenceCallback reference_callback = nullptr;
 	};
@@ -849,7 +849,7 @@ class ObjectDB {
 		uint64_t validator : OBJECTDB_VALIDATOR_BITS;
 		uint64_t next_free : OBJECTDB_SLOT_MAX_COUNT_BITS;
 		uint64_t is_ref_counted : 1;
-		Object *object;
+		Object *object = nullptr;
 	};
 
 	static SpinLock spin_lock;
diff --git a/core/object/script_language.h b/core/object/script_language.h
index af4f276825f6..08b82d798eda 100644
--- a/core/object/script_language.h
+++ b/core/object/script_language.h
@@ -430,11 +430,11 @@ public:
 extern uint8_t script_encryption_key[32];
 
 class PlaceHolderScriptInstance : public ScriptInstance {
-	Object *owner;
+	Object *owner = nullptr;
 	List<PropertyInfo> properties;
 	Map<StringName, Variant> values;
 	Map<StringName, Variant> constants;
-	ScriptLanguage *language;
+	ScriptLanguage *language = nullptr;
 	Ref<Script> script;
 
 public:
diff --git a/core/os/memory.h b/core/os/memory.h
index 27eaad5010a4..baa96ef3e97a 100644
--- a/core/os/memory.h
+++ b/core/os/memory.h
@@ -186,9 +186,9 @@ void memdelete_arr(T *p_class) {
 
 struct _GlobalNil {
 	int color = 1;
-	_GlobalNil *right;
-	_GlobalNil *left;
-	_GlobalNil *parent;
+	_GlobalNil *right = nullptr;
+	_GlobalNil *left = nullptr;
+	_GlobalNil *parent = nullptr;
 
 	_GlobalNil();
 };
diff --git a/core/os/os.h b/core/os/os.h
index 808d704b3da8..b3c66ff18c3a 100644
--- a/core/os/os.h
+++ b/core/os/os.h
@@ -60,8 +60,6 @@ class OS {
 	bool _stdout_enabled = true;
 	bool _stderr_enabled = true;
 
-	char *last_error;
-
 	CompositeLogger *_logger = nullptr;
 
 	bool restart_on_exit = false;
diff --git a/core/os/pool_allocator.h b/core/os/pool_allocator.h
index 11a252bc541c..0919a024e2d4 100644
--- a/core/os/pool_allocator.h
+++ b/core/os/pool_allocator.h
@@ -75,13 +75,13 @@ private:
 	typedef int EntryArrayPos;
 	typedef int EntryIndicesPos;
 
-	Entry *entry_array;
-	int *entry_indices;
+	Entry *entry_array = nullptr;
+	int *entry_indices = nullptr;
 	int entry_max;
 	int entry_count;
 
-	uint8_t *pool;
-	void *mem_ptr;
+	uint8_t *pool = nullptr;
+	void *mem_ptr = nullptr;
 	int pool_size;
 
 	int free_mem;
diff --git a/core/string/string_name.h b/core/string/string_name.h
index 6f08d3298171..f4233854ac85 100644
--- a/core/string/string_name.h
+++ b/core/string/string_name.h
@@ -70,7 +70,7 @@ class StringName {
 	_Data *_data = nullptr;
 
 	union _HashUnion {
-		_Data *ptr;
+		_Data *ptr = nullptr;
 		uint32_t hash;
 	};
 
diff --git a/core/templates/command_queue_mt.h b/core/templates/command_queue_mt.h
index 1ecb81c2a27f..0aa1cfd541bd 100644
--- a/core/templates/command_queue_mt.h
+++ b/core/templates/command_queue_mt.h
@@ -311,7 +311,7 @@ class CommandQueueMT {
 	};
 
 	struct SyncCommand : public CommandBase {
-		SyncSemaphore *sync_sem;
+		SyncSemaphore *sync_sem = nullptr;
 
 		virtual void post() {
 			sync_sem->sem.post();
diff --git a/core/templates/map.h b/core/templates/map.h
index f228640a1e72..c54da1dc0326 100644
--- a/core/templates/map.h
+++ b/core/templates/map.h
@@ -178,7 +178,7 @@ public:
 private:
 	struct _Data {
 		Element *_root = nullptr;
-		Element *_nil;
+		Element *_nil = nullptr;
 		int size_cache = 0;
 
 		_FORCE_INLINE_ _Data() {
@@ -344,7 +344,7 @@ private:
 	void _insert_rb_fix(Element *p_new_node) {
 		Element *node = p_new_node;
 		Element *nparent = node->parent;
-		Element *ngrand_parent;
+		Element *ngrand_parent = nullptr;
 
 		while (nparent->color == RED) {
 			ngrand_parent = nparent->parent;
@@ -500,7 +500,7 @@ private:
 		Element *rp = ((p_node->left == _data._nil) || (p_node->right == _data._nil)) ? p_node : p_node->_next;
 		Element *node = (rp->left == _data._nil) ? rp->right : rp->left;
 
-		Element *sibling;
+		Element *sibling = nullptr;
 		if (rp == rp->parent->left) {
 			rp->parent->left = node;
 			sibling = rp->parent->right;
diff --git a/core/templates/oa_hash_map.h b/core/templates/oa_hash_map.h
index 4e712fccf237..e4d9323c45e7 100644
--- a/core/templates/oa_hash_map.h
+++ b/core/templates/oa_hash_map.h
@@ -306,7 +306,7 @@ public:
 		bool valid;
 
 		const TKey *key;
-		TValue *value;
+		TValue *value = nullptr;
 
 	private:
 		uint32_t pos;
diff --git a/core/templates/safe_list.h b/core/templates/safe_list.h
index 53fc3fe5f9fb..ae31525dd07c 100644
--- a/core/templates/safe_list.h
+++ b/core/templates/safe_list.h
@@ -75,8 +75,8 @@ public:
 	class Iterator {
 		friend class SafeList;
 
-		SafeListNode *cursor;
-		SafeList *list;
+		SafeListNode *cursor = nullptr;
+		SafeList *list = nullptr;
 
 		Iterator(SafeListNode *p_cursor, SafeList *p_list) :
 				cursor(p_cursor), list(p_list) {
@@ -253,8 +253,8 @@ public:
 	class Iterator {
 		friend class SafeList;
 
-		SafeListNode *cursor;
-		SafeList *list;
+		SafeListNode *cursor = nullptr;
+		SafeList *list = nullptr;
 
 	public:
 		Iterator(SafeListNode *p_cursor, SafeList *p_list) :
diff --git a/core/templates/self_list.h b/core/templates/self_list.h
index 7f2236fa3acd..719b5f2e6339 100644
--- a/core/templates/self_list.h
+++ b/core/templates/self_list.h
@@ -108,7 +108,7 @@ public:
 
 private:
 	List *_root = nullptr;
-	T *_self;
+	T *_self = nullptr;
 	SelfList<T> *_next = nullptr;
 	SelfList<T> *_prev = nullptr;
 
diff --git a/core/templates/set.h b/core/templates/set.h
index cdc6e8447da1..a8a0a777122f 100644
--- a/core/templates/set.h
+++ b/core/templates/set.h
@@ -328,7 +328,7 @@ private:
 	void _insert_rb_fix(Element *p_new_node) {
 		Element *node = p_new_node;
 		Element *nparent = node->parent;
-		Element *ngrand_parent;
+		Element *ngrand_parent = nullptr;
 
 		while (nparent->color == RED) {
 			ngrand_parent = nparent->parent;
@@ -482,7 +482,7 @@ private:
 		Element *rp = ((p_node->left == _data._nil) || (p_node->right == _data._nil)) ? p_node : p_node->_next;
 		Element *node = (rp->left == _data._nil) ? rp->right : rp->left;
 
-		Element *sibling;
+		Element *sibling = nullptr;
 		if (rp == rp->parent->left) {
 			rp->parent->left = node;
 			sibling = rp->parent->right;
diff --git a/core/templates/thread_work_pool.h b/core/templates/thread_work_pool.h
index 957af44f48ac..d364ac4fd8a7 100644
--- a/core/templates/thread_work_pool.h
+++ b/core/templates/thread_work_pool.h
@@ -68,7 +68,7 @@ class ThreadWorkPool {
 		Semaphore start;
 		Semaphore completed;
 		std::atomic<bool> exit;
-		BaseWork *work;
+		BaseWork *work = nullptr;
 	};
 
 	ThreadData *threads = nullptr;
diff --git a/drivers/gles3/rasterizer_canvas_gles3.h b/drivers/gles3/rasterizer_canvas_gles3.h
index 4e825ab8b2de..70066c5e2a83 100644
--- a/drivers/gles3/rasterizer_canvas_gles3.h
+++ b/drivers/gles3/rasterizer_canvas_gles3.h
@@ -169,7 +169,7 @@ public:
 		LocalVector<GLsync> fences;
 		uint32_t current_buffer = 0;
 
-		InstanceData *instance_data_array;
+		InstanceData *instance_data_array = nullptr;
 		bool canvas_texscreen_used;
 		CanvasShaderGLES3 canvas_shader;
 		RID canvas_shader_current_version;
@@ -198,7 +198,7 @@ public:
 		bool end_batch = false;
 
 		Transform3D vp;
-		Light *using_light;
+		Light *using_light = nullptr;
 		bool using_shadow;
 		bool using_transparent_rt;
 
@@ -220,9 +220,9 @@ public:
 
 	typedef void Texture;
 
-	RasterizerSceneGLES3 *scene_render;
+	RasterizerSceneGLES3 *scene_render = nullptr;
 
-	RasterizerStorageGLES3 *storage;
+	RasterizerStorageGLES3 *storage = nullptr;
 
 	void _set_uniforms();
 
diff --git a/drivers/gles3/storage/material_storage.h b/drivers/gles3/storage/material_storage.h
index bf17e66c2f5e..450ee7191f61 100644
--- a/drivers/gles3/storage/material_storage.h
+++ b/drivers/gles3/storage/material_storage.h
@@ -66,7 +66,7 @@ struct Shader {
 	RID self;
 
 	RS::ShaderMode mode;
-	ShaderGLES3 *shader;
+	ShaderGLES3 *shader = nullptr;
 	String code;
 	SelfList<Material>::List materials;
 
@@ -185,7 +185,7 @@ struct Shader {
 
 struct Material {
 	RID self;
-	Shader *shader;
+	Shader *shader = nullptr;
 	Map<StringName, Variant> params;
 	SelfList<Material> list;
 	SelfList<Material> dirty_list;
diff --git a/drivers/gles3/storage/texture_storage.h b/drivers/gles3/storage/texture_storage.h
index 8a921fbe10d5..7656cdf67e00 100644
--- a/drivers/gles3/storage/texture_storage.h
+++ b/drivers/gles3/storage/texture_storage.h
@@ -93,7 +93,7 @@ enum OpenGLTextureFlags {
 struct Texture {
 	RID self;
 
-	Texture *proxy;
+	Texture *proxy = nullptr;
 	Set<Texture *> proxy_owners;
 
 	String path;
@@ -125,20 +125,20 @@ struct Texture {
 
 	uint16_t stored_cube_sides;
 
-	RenderTarget *render_target;
+	RenderTarget *render_target = nullptr;
 
 	Vector<Ref<Image>> images;
 
 	bool redraw_if_visible;
 
 	RS::TextureDetectCallback detect_3d;
-	void *detect_3d_ud;
+	void *detect_3d_ud = nullptr;
 
 	RS::TextureDetectCallback detect_srgb;
-	void *detect_srgb_ud;
+	void *detect_srgb_ud = nullptr;
 
 	RS::TextureDetectCallback detect_normal;
-	void *detect_normal_ud;
+	void *detect_normal_ud = nullptr;
 
 	CanvasTexture *canvas_texture = nullptr;
 
diff --git a/drivers/unix/dir_access_unix.h b/drivers/unix/dir_access_unix.h
index f90f55605cad..b4dc012db2c7 100644
--- a/drivers/unix/dir_access_unix.h
+++ b/drivers/unix/dir_access_unix.h
@@ -41,7 +41,7 @@
 #include <unistd.h>
 
 class DirAccessUnix : public DirAccess {
-	DIR *dir_stream;
+	DIR *dir_stream = nullptr;
 
 	static DirAccess *create_fs();
 
diff --git a/editor/action_map_editor.h b/editor/action_map_editor.h
index 34c70c942e51..e96139e07061 100644
--- a/editor/action_map_editor.h
+++ b/editor/action_map_editor.h
@@ -63,24 +63,24 @@ private:
 
 	Ref<InputEvent> event = Ref<InputEvent>();
 
-	TabContainer *tab_container;
+	TabContainer *tab_container = nullptr;
 
 	// Listening for input
-	Label *event_as_text;
-	ColorRect *mouse_detection_rect;
+	Label *event_as_text = nullptr;
+	ColorRect *mouse_detection_rect = nullptr;
 
 	// List of All Key/Mouse/Joypad input options.
 	int allowed_input_types;
-	Tree *input_list_tree;
-	LineEdit *input_list_search;
+	Tree *input_list_tree = nullptr;
+	LineEdit *input_list_search = nullptr;
 
 	// Additional Options, shown depending on event selected
-	VBoxContainer *additional_options_container;
+	VBoxContainer *additional_options_container = nullptr;
 
-	HBoxContainer *device_container;
-	OptionButton *device_id_option;
+	HBoxContainer *device_container = nullptr;
+	OptionButton *device_id_option = nullptr;
 
-	HBoxContainer *mod_container; // Contains the subcontainer and the store command checkbox.
+	HBoxContainer *mod_container = nullptr; // Contains the subcontainer and the store command checkbox.
 
 	enum ModCheckbox {
 		MOD_ALT,
@@ -93,9 +93,9 @@ private:
 	String mods[MOD_MAX] = { "Alt", "Shift", "Command", "Ctrl", "Metakey" };
 
 	CheckBox *mod_checkboxes[MOD_MAX];
-	CheckBox *store_command_checkbox;
+	CheckBox *store_command_checkbox = nullptr;
 
-	CheckBox *physical_key_checkbox;
+	CheckBox *physical_key_checkbox = nullptr;
 
 	void _set_event(const Ref<InputEvent> &p_event);
 
@@ -149,7 +149,7 @@ private:
 	};
 
 	Vector<ActionInfo> actions_cache;
-	Tree *action_tree;
+	Tree *action_tree = nullptr;
 
 	// Storing which action/event is currently being edited in the InputEventConfigurationDialog.
 
@@ -159,17 +159,17 @@ private:
 
 	// Popups
 
-	InputEventConfigurationDialog *event_config_dialog;
-	AcceptDialog *message;
+	InputEventConfigurationDialog *event_config_dialog = nullptr;
+	AcceptDialog *message = nullptr;
 
 	// Filtering and Adding actions
 
 	bool show_builtin_actions = false;
-	CheckButton *show_builtin_actions_checkbutton;
-	LineEdit *action_list_search;
+	CheckButton *show_builtin_actions_checkbutton = nullptr;
+	LineEdit *action_list_search = nullptr;
 
-	HBoxContainer *add_hbox;
-	LineEdit *add_edit;
+	HBoxContainer *add_hbox = nullptr;
+	LineEdit *add_edit = nullptr;
 
 	void _event_config_confirmed();
 
diff --git a/editor/animation_bezier_editor.h b/editor/animation_bezier_editor.h
index fa6fc405f21c..dcb650244020 100644
--- a/editor/animation_bezier_editor.h
+++ b/editor/animation_bezier_editor.h
@@ -49,7 +49,7 @@ class AnimationBezierTrackEdit : public Control {
 	AnimationTimelineEdit *timeline = nullptr;
 	UndoRedo *undo_redo = nullptr;
 	Node *root = nullptr;
-	Control *play_position; //separate control used to draw so updates for only position changed are much faster
+	Control *play_position = nullptr; //separate control used to draw so updates for only position changed are much faster
 	float play_position_pos = 0;
 
 	Ref<Animation> animation;
@@ -130,7 +130,7 @@ class AnimationBezierTrackEdit : public Control {
 		float transition = 0;
 	};
 
-	AnimationTrackEditor *editor;
+	AnimationTrackEditor *editor = nullptr;
 
 	struct EditPoint {
 		Rect2 point_rect;
diff --git a/editor/animation_track_editor.h b/editor/animation_track_editor.h
index 1baebc469e6e..d025dd3d26ec 100644
--- a/editor/animation_track_editor.h
+++ b/editor/animation_track_editor.h
@@ -54,27 +54,27 @@ class AnimationTimelineEdit : public Range {
 	GDCLASS(AnimationTimelineEdit, Range);
 
 	Ref<Animation> animation;
-	AnimationTrackEdit *track_edit;
+	AnimationTrackEdit *track_edit = nullptr;
 	int name_limit;
-	Range *zoom;
-	Range *h_scroll;
+	Range *zoom = nullptr;
+	Range *h_scroll = nullptr;
 	float play_position_pos;
 
-	HBoxContainer *len_hb;
-	EditorSpinSlider *length;
-	Button *loop;
-	TextureRect *time_icon;
+	HBoxContainer *len_hb = nullptr;
+	EditorSpinSlider *length = nullptr;
+	Button *loop = nullptr;
+	TextureRect *time_icon = nullptr;
 
-	MenuButton *add_track;
-	Control *play_position; //separate control used to draw so updates for only position changed are much faster
-	HScrollBar *hscroll;
+	MenuButton *add_track = nullptr;
+	Control *play_position = nullptr; //separate control used to draw so updates for only position changed are much faster
+	HScrollBar *hscroll = nullptr;
 
 	void _zoom_changed(double);
 	void _anim_length_changed(double p_new_len);
 	void _anim_loop_pressed();
 
 	void _play_position_draw();
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 	Rect2 hsize_rect;
 
 	bool editing = false;
@@ -146,12 +146,12 @@ class AnimationTrackEdit : public Control {
 		MENU_KEY_ADD_RESET,
 		MENU_KEY_DELETE
 	};
-	AnimationTimelineEdit *timeline;
-	UndoRedo *undo_redo;
-	Popup *path_popup;
-	LineEdit *path;
-	Node *root;
-	Control *play_position; //separate control used to draw so updates for only position changed are much faster
+	AnimationTimelineEdit *timeline = nullptr;
+	UndoRedo *undo_redo = nullptr;
+	Popup *path_popup = nullptr;
+	LineEdit *path = nullptr;
+	Node *root = nullptr;
+	Control *play_position = nullptr; //separate control used to draw so updates for only position changed are much faster
 	float play_position_pos;
 	NodePath node_path;
 
@@ -169,7 +169,7 @@ class AnimationTrackEdit : public Control {
 	Ref<Texture2D> type_icon;
 	Ref<Texture2D> selected_icon;
 
-	PopupMenu *menu;
+	PopupMenu *menu = nullptr;
 
 	bool clicking_on_name = false;
 
@@ -194,7 +194,7 @@ class AnimationTrackEdit : public Control {
 	float moving_selection_from_ofs;
 
 	bool in_group = false;
-	AnimationTrackEditor *editor;
+	AnimationTrackEditor *editor = nullptr;
 
 protected:
 	static void _bind_methods();
@@ -285,27 +285,27 @@ class AnimationTrackEditor : public VBoxContainer {
 	GDCLASS(AnimationTrackEditor, VBoxContainer);
 
 	Ref<Animation> animation;
-	Node *root;
+	Node *root = nullptr;
 
-	MenuButton *edit;
+	MenuButton *edit = nullptr;
 
-	PanelContainer *main_panel;
-	HScrollBar *hscroll;
-	ScrollContainer *scroll;
-	VBoxContainer *track_vbox;
-	AnimationBezierTrackEdit *bezier_edit;
+	PanelContainer *main_panel = nullptr;
+	HScrollBar *hscroll = nullptr;
+	ScrollContainer *scroll = nullptr;
+	VBoxContainer *track_vbox = nullptr;
+	AnimationBezierTrackEdit *bezier_edit = nullptr;
 
-	Label *info_message;
+	Label *info_message = nullptr;
 
-	AnimationTimelineEdit *timeline;
-	HSlider *zoom;
-	EditorSpinSlider *step;
-	TextureRect *zoom_icon;
-	Button *snap;
-	Button *bezier_edit_icon;
-	OptionButton *snap_mode;
+	AnimationTimelineEdit *timeline = nullptr;
+	HSlider *zoom = nullptr;
+	EditorSpinSlider *step = nullptr;
+	TextureRect *zoom_icon = nullptr;
+	Button *snap = nullptr;
+	Button *bezier_edit_icon = nullptr;
+	OptionButton *snap_mode = nullptr;
 
-	Button *imported_anim_warning;
+	Button *imported_anim_warning = nullptr;
 	void _show_imported_anim_warning();
 
 	void _snap_mode_changed(int p_mode);
@@ -323,7 +323,7 @@ class AnimationTrackEditor : public VBoxContainer {
 	void _track_remove_request(int p_track);
 	void _track_grab_focus(int p_track);
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	void _update_scroll(double);
 	void _update_step(double p_new_step);
@@ -336,9 +336,9 @@ class AnimationTrackEditor : public VBoxContainer {
 
 	void _update_step_spinbox();
 
-	PropertySelector *prop_selector;
-	PropertySelector *method_selector;
-	SceneTreeDialog *pick_track;
+	PropertySelector *prop_selector = nullptr;
+	PropertySelector *method_selector = nullptr;
+	SceneTreeDialog *pick_track = nullptr;
 	int adding_track_type;
 	NodePath adding_track_path;
 
@@ -353,10 +353,10 @@ class AnimationTrackEditor : public VBoxContainer {
 		bool advance = false;
 	}; /* insert_data;*/
 
-	Label *insert_confirm_text;
-	CheckBox *insert_confirm_bezier;
-	CheckBox *insert_confirm_reset;
-	ConfirmationDialog *insert_confirm;
+	Label *insert_confirm_text = nullptr;
+	CheckBox *insert_confirm_bezier = nullptr;
+	CheckBox *insert_confirm_reset = nullptr;
+	ConfirmationDialog *insert_confirm = nullptr;
 	bool insert_queue = false;
 	List<InsertData> insert_data;
 
@@ -419,13 +419,13 @@ class AnimationTrackEditor : public VBoxContainer {
 	void _move_selection_commit();
 	void _move_selection_cancel();
 
-	AnimationTrackKeyEdit *key_edit;
-	AnimationMultiTrackKeyEdit *multi_key_edit;
+	AnimationTrackKeyEdit *key_edit = nullptr;
+	AnimationMultiTrackKeyEdit *multi_key_edit = nullptr;
 	void _update_key_edit();
 
 	void _clear_key_edit();
 
-	Control *box_selection;
+	Control *box_selection = nullptr;
 	void _box_selection_draw();
 	bool box_selecting = false;
 	Vector2 box_selecting_from;
@@ -440,18 +440,18 @@ class AnimationTrackEditor : public VBoxContainer {
 
 	////////////// edit menu stuff
 
-	ConfirmationDialog *optimize_dialog;
-	SpinBox *optimize_linear_error;
-	SpinBox *optimize_angular_error;
-	SpinBox *optimize_max_angle;
+	ConfirmationDialog *optimize_dialog = nullptr;
+	SpinBox *optimize_linear_error = nullptr;
+	SpinBox *optimize_angular_error = nullptr;
+	SpinBox *optimize_max_angle = nullptr;
 
-	ConfirmationDialog *cleanup_dialog;
-	CheckBox *cleanup_keys;
-	CheckBox *cleanup_tracks;
-	CheckBox *cleanup_all;
+	ConfirmationDialog *cleanup_dialog = nullptr;
+	CheckBox *cleanup_keys = nullptr;
+	CheckBox *cleanup_tracks = nullptr;
+	CheckBox *cleanup_all = nullptr;
 
-	ConfirmationDialog *scale_dialog;
-	SpinBox *scale;
+	ConfirmationDialog *scale_dialog = nullptr;
+	SpinBox *scale = nullptr;
 
 	void _select_all_tracks_for_copy();
 
@@ -464,13 +464,13 @@ class AnimationTrackEditor : public VBoxContainer {
 	void _anim_duplicate_keys(bool transpose);
 
 	void _view_group_toggle();
-	Button *view_group;
-	Button *selected_filter;
+	Button *view_group = nullptr;
+	Button *selected_filter = nullptr;
 
 	void _selection_changed();
 
-	ConfirmationDialog *track_copy_dialog;
-	Tree *track_copy_select;
+	ConfirmationDialog *track_copy_dialog = nullptr;
+	Tree *track_copy_select = nullptr;
 
 	struct TrackClipboard {
 		NodePath full_path;
diff --git a/editor/code_editor.h b/editor/code_editor.h
index bbc45d6ec0e3..d52f57860c85 100644
--- a/editor/code_editor.h
+++ b/editor/code_editor.h
@@ -43,10 +43,10 @@
 class GotoLineDialog : public ConfirmationDialog {
 	GDCLASS(GotoLineDialog, ConfirmationDialog);
 
-	Label *line_label;
-	LineEdit *line;
+	Label *line_label = nullptr;
+	LineEdit *line = nullptr;
 
-	CodeEdit *text_editor;
+	CodeEdit *text_editor = nullptr;
 
 	virtual void ok_pressed() override;
 
@@ -62,25 +62,25 @@ class CodeTextEditor;
 class FindReplaceBar : public HBoxContainer {
 	GDCLASS(FindReplaceBar, HBoxContainer);
 
-	LineEdit *search_text;
-	Label *matches_label;
-	Button *find_prev;
-	Button *find_next;
-	CheckBox *case_sensitive;
-	CheckBox *whole_words;
-	TextureButton *hide_button;
+	LineEdit *search_text = nullptr;
+	Label *matches_label = nullptr;
+	Button *find_prev = nullptr;
+	Button *find_next = nullptr;
+	CheckBox *case_sensitive = nullptr;
+	CheckBox *whole_words = nullptr;
+	TextureButton *hide_button = nullptr;
 
-	LineEdit *replace_text;
-	Button *replace;
-	Button *replace_all;
-	CheckBox *selection_only;
+	LineEdit *replace_text = nullptr;
+	Button *replace = nullptr;
+	Button *replace_all = nullptr;
+	CheckBox *selection_only = nullptr;
 
-	VBoxContainer *vbc_lineedit;
-	HBoxContainer *hbc_button_replace;
-	HBoxContainer *hbc_option_replace;
+	VBoxContainer *vbc_lineedit = nullptr;
+	HBoxContainer *hbc_button_replace = nullptr;
+	HBoxContainer *hbc_option_replace = nullptr;
 
 	CodeTextEditor *base_text_editor = nullptr;
-	CodeEdit *text_editor;
+	CodeEdit *text_editor = nullptr;
 
 	int result_line;
 	int result_col;
@@ -139,25 +139,25 @@ typedef void (*CodeTextEditorCodeCompleteFunc)(void *p_ud, const String &p_code,
 class CodeTextEditor : public VBoxContainer {
 	GDCLASS(CodeTextEditor, VBoxContainer);
 
-	CodeEdit *text_editor;
+	CodeEdit *text_editor = nullptr;
 	FindReplaceBar *find_replace_bar = nullptr;
-	HBoxContainer *status_bar;
+	HBoxContainer *status_bar = nullptr;
 
-	Button *toggle_scripts_button;
-	Button *error_button;
-	Button *warning_button;
+	Button *toggle_scripts_button = nullptr;
+	Button *error_button = nullptr;
+	Button *warning_button = nullptr;
 
-	Label *line_and_col_txt;
+	Label *line_and_col_txt = nullptr;
 
-	Label *info;
-	Timer *idle;
-	Timer *code_complete_timer;
+	Label *info = nullptr;
+	Timer *idle = nullptr;
+	Timer *code_complete_timer = nullptr;
 
-	Timer *font_resize_timer;
+	Timer *font_resize_timer = nullptr;
 	int font_resize_val;
 	real_t font_size;
 
-	Label *error;
+	Label *error = nullptr;
 	int error_line;
 	int error_column;
 
@@ -181,7 +181,7 @@ class CodeTextEditor : public VBoxContainer {
 	Color completion_string_color;
 	Color completion_comment_color;
 	CodeTextEditorCodeCompleteFunc code_complete_func;
-	void *code_complete_ud;
+	void *code_complete_ud = nullptr;
 
 	void _error_button_pressed();
 	void _warning_button_pressed();
diff --git a/editor/connections_dialog.h b/editor/connections_dialog.h
index 58c584b8b2f5..4b1b8363dd96 100644
--- a/editor/connections_dialog.h
+++ b/editor/connections_dialog.h
@@ -105,27 +105,27 @@ public:
 	};
 
 private:
-	Label *connect_to_label;
-	LineEdit *from_signal;
-	Node *source;
+	Label *connect_to_label = nullptr;
+	LineEdit *from_signal = nullptr;
+	Node *source = nullptr;
 	StringName signal;
-	LineEdit *dst_method;
-	ConnectDialogBinds *cdbinds;
+	LineEdit *dst_method = nullptr;
+	ConnectDialogBinds *cdbinds = nullptr;
 	bool edit_mode;
 	NodePath dst_path;
-	VBoxContainer *vbc_right;
+	VBoxContainer *vbc_right = nullptr;
 
-	SceneTreeEditor *tree;
-	AcceptDialog *error;
-	SpinBox *unbind_count;
-	EditorInspector *bind_editor;
-	OptionButton *type_list;
-	CheckBox *deferred;
-	CheckBox *oneshot;
-	CheckButton *advanced;
+	SceneTreeEditor *tree = nullptr;
+	AcceptDialog *error = nullptr;
+	SpinBox *unbind_count = nullptr;
+	EditorInspector *bind_editor = nullptr;
+	OptionButton *type_list = nullptr;
+	CheckBox *deferred = nullptr;
+	CheckBox *oneshot = nullptr;
+	CheckButton *advanced = nullptr;
 	Vector<Control *> bind_controls;
 
-	Label *error_label;
+	Label *error_label = nullptr;
 
 	void ok_pressed() override;
 	void _cancel_pressed();
@@ -186,16 +186,16 @@ class ConnectionsDock : public VBoxContainer {
 		DISCONNECT
 	};
 
-	Node *selected_node;
-	ConnectionsDockTree *tree;
+	Node *selected_node = nullptr;
+	ConnectionsDockTree *tree = nullptr;
 
-	ConfirmationDialog *disconnect_all_dialog;
-	ConnectDialog *connect_dialog;
-	Button *connect_button;
-	PopupMenu *signal_menu;
-	PopupMenu *slot_menu;
-	UndoRedo *undo_redo;
-	LineEdit *search_box;
+	ConfirmationDialog *disconnect_all_dialog = nullptr;
+	ConnectDialog *connect_dialog = nullptr;
+	Button *connect_button = nullptr;
+	PopupMenu *signal_menu = nullptr;
+	PopupMenu *slot_menu = nullptr;
+	UndoRedo *undo_redo = nullptr;
+	LineEdit *search_box = nullptr;
 
 	Map<StringName, Map<StringName, String>> descr_cache;
 
diff --git a/editor/create_dialog.h b/editor/create_dialog.h
index fe7c89c05957..31761be6fe22 100644
--- a/editor/create_dialog.h
+++ b/editor/create_dialog.h
@@ -47,18 +47,18 @@ class CreateDialog : public ConfirmationDialog {
 		OTHER_TYPE
 	};
 
-	LineEdit *search_box;
-	Tree *search_options;
+	LineEdit *search_box = nullptr;
+	Tree *search_options = nullptr;
 
 	String base_type;
 	String icon_fallback;
 	String preferred_search_result_type;
 
-	Button *favorite;
+	Button *favorite = nullptr;
 	Vector<String> favorite_list;
-	Tree *favorites;
-	ItemList *recent;
-	EditorHelpBit *help_bit;
+	Tree *favorites = nullptr;
+	ItemList *recent = nullptr;
+	EditorHelpBit *help_bit = nullptr;
 
 	HashMap<String, TreeItem *> search_options_types;
 	HashMap<String, String> custom_type_parents;
diff --git a/editor/debugger/debug_adapter/debug_adapter_protocol.h b/editor/debugger/debug_adapter/debug_adapter_protocol.h
index b54a5f1f3fe1..e4760bea5420 100644
--- a/editor/debugger/debug_adapter/debug_adapter_protocol.h
+++ b/editor/debugger/debug_adapter/debug_adapter_protocol.h
@@ -76,7 +76,7 @@ class DebugAdapterProtocol : public Object {
 
 private:
 	static DebugAdapterProtocol *singleton;
-	DebugAdapterParser *parser;
+	DebugAdapterParser *parser = nullptr;
 
 	List<Ref<DAPeer>> clients;
 	Ref<TCPServer> server;
diff --git a/editor/debugger/editor_debugger_inspector.h b/editor/debugger/editor_debugger_inspector.h
index 5cdc4417d017..8f523bfbdc7f 100644
--- a/editor/debugger/editor_debugger_inspector.h
+++ b/editor/debugger/editor_debugger_inspector.h
@@ -70,7 +70,7 @@ private:
 	ObjectID inspected_object_id;
 	Map<ObjectID, EditorDebuggerRemoteObject *> remote_objects;
 	Set<RES> remote_dependencies;
-	EditorDebuggerRemoteObject *variables;
+	EditorDebuggerRemoteObject *variables = nullptr;
 
 	void _object_selected(ObjectID p_object);
 	void _object_edited(ObjectID p_id, const String &p_prop, const Variant &p_value);
diff --git a/editor/debugger/editor_network_profiler.h b/editor/debugger/editor_network_profiler.h
index 3e95eb0de6dc..3a604f55641e 100644
--- a/editor/debugger/editor_network_profiler.h
+++ b/editor/debugger/editor_network_profiler.h
@@ -42,13 +42,13 @@ class EditorNetworkProfiler : public VBoxContainer {
 	GDCLASS(EditorNetworkProfiler, VBoxContainer)
 
 private:
-	Button *activate;
-	Button *clear_button;
-	Tree *counters_display;
-	LineEdit *incoming_bandwidth_text;
-	LineEdit *outgoing_bandwidth_text;
+	Button *activate = nullptr;
+	Button *clear_button = nullptr;
+	Tree *counters_display = nullptr;
+	LineEdit *incoming_bandwidth_text = nullptr;
+	LineEdit *outgoing_bandwidth_text = nullptr;
 
-	Timer *frame_delay;
+	Timer *frame_delay = nullptr;
 
 	Map<ObjectID, SceneDebugger::RPCNodeInfo> nodes_data;
 
diff --git a/editor/debugger/editor_performance_profiler.h b/editor/debugger/editor_performance_profiler.h
index 998ecc5bb691..a917ddbe28e2 100644
--- a/editor/debugger/editor_performance_profiler.h
+++ b/editor/debugger/editor_performance_profiler.h
@@ -62,9 +62,9 @@ private:
 	OrderedHashMap<StringName, Monitor> monitors;
 
 	Map<StringName, TreeItem *> base_map;
-	Tree *monitor_tree;
-	Control *monitor_draw;
-	Label *info_message;
+	Tree *monitor_tree = nullptr;
+	Control *monitor_draw = nullptr;
+	Label *info_message = nullptr;
 	StringName marker_key;
 	int marker_frame;
 	const int MARGIN = 4;
diff --git a/editor/debugger/editor_profiler.h b/editor/debugger/editor_profiler.h
index 45f7ac39c166..34f34be7c393 100644
--- a/editor/debugger/editor_profiler.h
+++ b/editor/debugger/editor_profiler.h
@@ -90,20 +90,20 @@ public:
 	};
 
 private:
-	Button *activate;
-	Button *clear_button;
-	TextureRect *graph;
+	Button *activate = nullptr;
+	Button *clear_button = nullptr;
+	TextureRect *graph = nullptr;
 	Ref<ImageTexture> graph_texture;
 	Vector<uint8_t> graph_image;
-	Tree *variables;
-	HSplitContainer *h_split;
+	Tree *variables = nullptr;
+	HSplitContainer *h_split = nullptr;
 
 	Set<StringName> plot_sigs;
 
-	OptionButton *display_mode;
-	OptionButton *display_time;
+	OptionButton *display_mode = nullptr;
+	OptionButton *display_time = nullptr;
 
-	SpinBox *cursor_metric_edit;
+	SpinBox *cursor_metric_edit = nullptr;
 
 	Vector<Metric> frame_metrics;
 	int total_metrics;
@@ -119,8 +119,8 @@ private:
 
 	bool seeking;
 
-	Timer *frame_delay;
-	Timer *plot_delay;
+	Timer *frame_delay = nullptr;
+	Timer *plot_delay = nullptr;
 
 	void _update_frame();
 
diff --git a/editor/debugger/editor_visual_profiler.h b/editor/debugger/editor_visual_profiler.h
index 55ba725ae810..14eacca02d9c 100644
--- a/editor/debugger/editor_visual_profiler.h
+++ b/editor/debugger/editor_visual_profiler.h
@@ -67,20 +67,20 @@ public:
 	};
 
 private:
-	Button *activate;
-	Button *clear_button;
+	Button *activate = nullptr;
+	Button *clear_button = nullptr;
 
-	TextureRect *graph;
+	TextureRect *graph = nullptr;
 	Ref<ImageTexture> graph_texture;
 	Vector<uint8_t> graph_image;
-	Tree *variables;
-	HSplitContainer *h_split;
-	CheckBox *frame_relative;
-	CheckBox *linked;
+	Tree *variables = nullptr;
+	HSplitContainer *h_split = nullptr;
+	CheckBox *frame_relative = nullptr;
+	CheckBox *linked = nullptr;
 
-	OptionButton *display_mode;
+	OptionButton *display_mode = nullptr;
 
-	SpinBox *cursor_metric_edit;
+	SpinBox *cursor_metric_edit = nullptr;
 
 	Vector<Metric> frame_metrics;
 	int last_metric;
@@ -99,8 +99,8 @@ private:
 
 	bool seeking;
 
-	Timer *frame_delay;
-	Timer *plot_delay;
+	Timer *frame_delay = nullptr;
+	Timer *plot_delay = nullptr;
 
 	void _update_frame(bool p_focus_selected = false);
 
diff --git a/editor/debugger/script_editor_debugger.h b/editor/debugger/script_editor_debugger.h
index 486ac26ef796..ad90e63c1629 100644
--- a/editor/debugger/script_editor_debugger.h
+++ b/editor/debugger/script_editor_debugger.h
@@ -85,26 +85,26 @@ private:
 		ACTION_DELETE_ALL_BREAKPOINTS,
 	};
 
-	AcceptDialog *msgdialog;
+	AcceptDialog *msgdialog = nullptr;
 
-	LineEdit *clicked_ctrl;
-	LineEdit *clicked_ctrl_type;
-	LineEdit *live_edit_root;
-	Button *le_set;
-	Button *le_clear;
-	Button *export_csv;
+	LineEdit *clicked_ctrl = nullptr;
+	LineEdit *clicked_ctrl_type = nullptr;
+	LineEdit *live_edit_root = nullptr;
+	Button *le_set = nullptr;
+	Button *le_clear = nullptr;
+	Button *export_csv = nullptr;
 
-	VBoxContainer *errors_tab;
-	Tree *error_tree;
-	Button *expand_all_button;
-	Button *collapse_all_button;
-	Button *clear_button;
-	PopupMenu *item_menu;
+	VBoxContainer *errors_tab = nullptr;
+	Tree *error_tree = nullptr;
+	Button *expand_all_button = nullptr;
+	Button *collapse_all_button = nullptr;
+	Button *clear_button = nullptr;
+	PopupMenu *item_menu = nullptr;
 
-	Tree *breakpoints_tree;
-	PopupMenu *breakpoints_menu;
+	Tree *breakpoints_tree = nullptr;
+	PopupMenu *breakpoints_menu = nullptr;
 
-	EditorFileDialog *file_dialog;
+	EditorFileDialog *file_dialog = nullptr;
 	enum FileDialogPurpose {
 		SAVE_MONITORS_CSV,
 		SAVE_VRAM_CSV,
@@ -117,31 +117,31 @@ private:
 	bool skip_breakpoints_value = false;
 	Ref<Script> stack_script;
 
-	TabContainer *tabs;
+	TabContainer *tabs = nullptr;
 
-	Label *reason;
+	Label *reason = nullptr;
 
-	Button *skip_breakpoints;
-	Button *copy;
-	Button *step;
-	Button *next;
-	Button *dobreak;
-	Button *docontinue;
+	Button *skip_breakpoints = nullptr;
+	Button *copy = nullptr;
+	Button *step = nullptr;
+	Button *next = nullptr;
+	Button *dobreak = nullptr;
+	Button *docontinue = nullptr;
 	// Reference to "Remote" tab in scene tree. Needed by _live_edit_set and buttons state.
 	// Each debugger should have it's tree in the future I guess.
 	const Tree *editor_remote_tree = nullptr;
 
 	Map<int, String> profiler_signature;
 
-	Tree *vmem_tree;
-	Button *vmem_refresh;
-	Button *vmem_export;
-	LineEdit *vmem_total;
+	Tree *vmem_tree = nullptr;
+	Button *vmem_refresh = nullptr;
+	Button *vmem_export = nullptr;
+	LineEdit *vmem_total = nullptr;
 
-	Tree *stack_dump;
+	Tree *stack_dump = nullptr;
 	LineEdit *search = nullptr;
-	EditorDebuggerInspector *inspector;
-	SceneDebuggerTree *scene_tree;
+	EditorDebuggerInspector *inspector = nullptr;
+	SceneDebuggerTree *scene_tree = nullptr;
 
 	Ref<RemoteDebuggerPeer> peer;
 
@@ -149,10 +149,10 @@ private:
 	int last_path_id;
 	Map<String, int> res_path_cache;
 
-	EditorProfiler *profiler;
-	EditorVisualProfiler *visual_profiler;
-	EditorNetworkProfiler *network_profiler;
-	EditorPerformanceProfiler *performance_profiler;
+	EditorProfiler *profiler = nullptr;
+	EditorVisualProfiler *visual_profiler = nullptr;
+	EditorNetworkProfiler *network_profiler = nullptr;
+	EditorPerformanceProfiler *performance_profiler = nullptr;
 
 	OS::ProcessID remote_pid = 0;
 	bool breaked = false;
diff --git a/editor/dependency_editor.h b/editor/dependency_editor.h
index 84642edd79f3..d1dc470c7960 100644
--- a/editor/dependency_editor.h
+++ b/editor/dependency_editor.h
@@ -42,10 +42,10 @@ class EditorFileSystemDirectory;
 class DependencyEditor : public AcceptDialog {
 	GDCLASS(DependencyEditor, AcceptDialog);
 
-	Tree *tree;
-	Button *fixdeps;
+	Tree *tree = nullptr;
+	Button *fixdeps = nullptr;
 
-	EditorFileDialog *search;
+	EditorFileDialog *search = nullptr;
 
 	String replacing;
 	String editing;
@@ -71,8 +71,8 @@ public:
 class DependencyEditorOwners : public AcceptDialog {
 	GDCLASS(DependencyEditorOwners, AcceptDialog);
 
-	ItemList *owners;
-	PopupMenu *file_options;
+	ItemList *owners = nullptr;
+	PopupMenu *file_options = nullptr;
 	String editing;
 
 	void _fill_owners(EditorFileSystemDirectory *efsd);
@@ -95,8 +95,8 @@ public:
 class DependencyRemoveDialog : public ConfirmationDialog {
 	GDCLASS(DependencyRemoveDialog, ConfirmationDialog);
 
-	Label *text;
-	Tree *owners;
+	Label *text = nullptr;
+	Tree *owners = nullptr;
 
 	Map<String, String> all_remove_files;
 	Vector<String> dirs_to_delete;
@@ -142,9 +142,9 @@ public:
 private:
 	String for_file;
 	Mode mode;
-	Button *fdep;
-	Label *text;
-	Tree *files;
+	Button *fdep = nullptr;
+	Label *text = nullptr;
+	Tree *files = nullptr;
 	void ok_pressed() override;
 	void custom_action(const String &) override;
 
@@ -156,9 +156,9 @@ public:
 class OrphanResourcesDialog : public ConfirmationDialog {
 	GDCLASS(OrphanResourcesDialog, ConfirmationDialog);
 
-	DependencyEditor *dep_edit;
-	Tree *files;
-	ConfirmationDialog *delete_confirm;
+	DependencyEditor *dep_edit = nullptr;
+	Tree *files = nullptr;
+	ConfirmationDialog *delete_confirm = nullptr;
 	void ok_pressed() override;
 
 	bool _fill_owners(EditorFileSystemDirectory *efsd, HashMap<String, int> &refs, TreeItem *p_parent);
diff --git a/editor/editor_about.h b/editor/editor_about.h
index 5a3b1e198777..6f05700582df 100644
--- a/editor/editor_about.h
+++ b/editor/editor_about.h
@@ -56,11 +56,11 @@ private:
 	void _version_button_pressed();
 	ScrollContainer *_populate_list(const String &p_name, const List<String> &p_sections, const char *const *const p_src[], const int p_flag_single_column = 0);
 
-	LinkButton *version_btn;
-	Tree *_tpl_tree;
-	RichTextLabel *_license_text;
-	RichTextLabel *_tpl_text;
-	TextureRect *_logo;
+	LinkButton *version_btn = nullptr;
+	Tree *_tpl_tree = nullptr;
+	RichTextLabel *_license_text = nullptr;
+	RichTextLabel *_tpl_text = nullptr;
+	TextureRect *_logo = nullptr;
 
 	void _theme_changed();
 
diff --git a/editor/editor_asset_installer.h b/editor/editor_asset_installer.h
index 58c232f3514a..deb320e7fa71 100644
--- a/editor/editor_asset_installer.h
+++ b/editor/editor_asset_installer.h
@@ -36,11 +36,11 @@
 class EditorAssetInstaller : public ConfirmationDialog {
 	GDCLASS(EditorAssetInstaller, ConfirmationDialog);
 
-	Tree *tree;
-	Label *asset_contents;
+	Tree *tree = nullptr;
+	Label *asset_contents = nullptr;
 	String package_path;
 	String asset_name;
-	AcceptDialog *error;
+	AcceptDialog *error = nullptr;
 	Map<String, TreeItem *> status_map;
 	bool updating = false;
 	void _item_edited();
diff --git a/editor/editor_audio_buses.h b/editor/editor_audio_buses.h
index 0020b6137076..81a6e5b86d02 100644
--- a/editor/editor_audio_buses.h
+++ b/editor/editor_audio_buses.h
@@ -52,9 +52,9 @@ class EditorAudioBus : public PanelContainer {
 	GDCLASS(EditorAudioBus, PanelContainer);
 
 	Ref<Texture2D> disabled_vu;
-	LineEdit *track_name;
-	MenuButton *bus_options;
-	VSlider *slider;
+	LineEdit *track_name = nullptr;
+	MenuButton *bus_options = nullptr;
+	VSlider *slider = nullptr;
 
 	int cc;
 	static const int CHANNELS_MAX = 4;
@@ -69,21 +69,21 @@ class EditorAudioBus : public PanelContainer {
 		TextureProgressBar *vu_r = nullptr;
 	} channel[CHANNELS_MAX];
 
-	OptionButton *send;
+	OptionButton *send = nullptr;
 
-	PopupMenu *effect_options;
-	PopupMenu *bus_popup;
-	PopupMenu *delete_effect_popup;
+	PopupMenu *effect_options = nullptr;
+	PopupMenu *bus_popup = nullptr;
+	PopupMenu *delete_effect_popup = nullptr;
 
-	Panel *audio_value_preview_box;
-	Label *audio_value_preview_label;
-	Timer *preview_timer;
+	Panel *audio_value_preview_box = nullptr;
+	Label *audio_value_preview_label = nullptr;
+	Timer *preview_timer = nullptr;
 
-	Button *solo;
-	Button *mute;
-	Button *bypass;
+	Button *solo = nullptr;
+	Button *mute = nullptr;
+	Button *bypass = nullptr;
 
-	Tree *effects;
+	Tree *effects = nullptr;
 
 	bool updating_bus = false;
 	bool is_master;
@@ -121,7 +121,7 @@ class EditorAudioBus : public PanelContainer {
 
 	friend class EditorAudioBuses;
 
-	EditorAudioBuses *buses;
+	EditorAudioBuses *buses = nullptr;
 
 protected:
 	static void _bind_methods();
@@ -153,22 +153,22 @@ public:
 class EditorAudioBuses : public VBoxContainer {
 	GDCLASS(EditorAudioBuses, VBoxContainer);
 
-	HBoxContainer *top_hb;
+	HBoxContainer *top_hb = nullptr;
 
-	ScrollContainer *bus_scroll;
-	HBoxContainer *bus_hb;
+	ScrollContainer *bus_scroll = nullptr;
+	HBoxContainer *bus_hb = nullptr;
 
-	EditorAudioBusDrop *drop_end;
+	EditorAudioBusDrop *drop_end = nullptr;
 
-	Label *file;
+	Label *file = nullptr;
 
-	Button *add;
-	Button *load;
-	Button *save_as;
-	Button *_default;
-	Button *_new;
+	Button *add = nullptr;
+	Button *load = nullptr;
+	Button *save_as = nullptr;
+	Button *_default = nullptr;
+	Button *_new = nullptr;
 
-	Timer *save_timer;
+	Timer *save_timer = nullptr;
 	String edited_path;
 
 	void _add_bus();
@@ -191,7 +191,7 @@ class EditorAudioBuses : public VBoxContainer {
 	void _load_default_layout();
 	void _new_layout();
 
-	EditorFileDialog *file_dialog;
+	EditorFileDialog *file_dialog = nullptr;
 	bool new_layout;
 
 	void _file_dialog_callback(const String &p_string);
@@ -262,7 +262,7 @@ public:
 class AudioBusesEditorPlugin : public EditorPlugin {
 	GDCLASS(AudioBusesEditorPlugin, EditorPlugin);
 
-	EditorAudioBuses *audio_bus_editor;
+	EditorAudioBuses *audio_bus_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "SampleLibrary"; }
diff --git a/editor/editor_command_palette.h b/editor/editor_command_palette.h
index 41141af0c3ee..124703cca488 100644
--- a/editor/editor_command_palette.h
+++ b/editor/editor_command_palette.h
@@ -40,8 +40,8 @@ class EditorCommandPalette : public ConfirmationDialog {
 	GDCLASS(EditorCommandPalette, ConfirmationDialog);
 
 	static EditorCommandPalette *singleton;
-	LineEdit *command_search_box;
-	Tree *search_options;
+	LineEdit *command_search_box = nullptr;
+	Tree *search_options = nullptr;
 
 	struct Command {
 		Callable callable;
diff --git a/editor/editor_dir_dialog.h b/editor/editor_dir_dialog.h
index e97b5ce8af75..9baa37793bfc 100644
--- a/editor/editor_dir_dialog.h
+++ b/editor/editor_dir_dialog.h
@@ -39,14 +39,14 @@
 class EditorDirDialog : public ConfirmationDialog {
 	GDCLASS(EditorDirDialog, ConfirmationDialog);
 
-	ConfirmationDialog *makedialog;
-	LineEdit *makedirname;
-	AcceptDialog *mkdirerr;
+	ConfirmationDialog *makedialog = nullptr;
+	LineEdit *makedirname = nullptr;
+	AcceptDialog *mkdirerr = nullptr;
 
-	Button *makedir;
+	Button *makedir = nullptr;
 	Set<String> opened_paths;
 
-	Tree *tree;
+	Tree *tree = nullptr;
 	bool updating = false;
 
 	void _item_collapsed(Object *p_item);
diff --git a/editor/editor_export.h b/editor/editor_export.h
index 7c61e7cff678..4d5aebc77035 100644
--- a/editor/editor_export.h
+++ b/editor/editor_export.h
@@ -380,7 +380,7 @@ class EditorExport : public Node {
 
 	StringName _export_presets_updated;
 
-	Timer *save_timer;
+	Timer *save_timer = nullptr;
 	bool block_save = false;
 
 	static EditorExport *singleton;
diff --git a/editor/editor_feature_profile.h b/editor/editor_feature_profile.h
index 881f14638f5d..19df8a968677 100644
--- a/editor/editor_feature_profile.h
+++ b/editor/editor_feature_profile.h
@@ -117,25 +117,25 @@ class EditorFeatureProfileManager : public AcceptDialog {
 		CLASS_OPTION_DISABLE_EDITOR
 	};
 
-	ConfirmationDialog *erase_profile_dialog;
-	ConfirmationDialog *new_profile_dialog;
-	LineEdit *new_profile_name;
+	ConfirmationDialog *erase_profile_dialog = nullptr;
+	ConfirmationDialog *new_profile_dialog = nullptr;
+	LineEdit *new_profile_name = nullptr;
 
-	LineEdit *current_profile_name;
-	OptionButton *profile_list;
+	LineEdit *current_profile_name = nullptr;
+	OptionButton *profile_list = nullptr;
 	Button *profile_actions[PROFILE_MAX];
 
-	HSplitContainer *h_split;
+	HSplitContainer *h_split = nullptr;
 
-	VBoxContainer *class_list_vbc;
-	Tree *class_list;
-	VBoxContainer *property_list_vbc;
-	Tree *property_list;
-	EditorHelpBit *description_bit;
-	Label *no_profile_selected_help;
+	VBoxContainer *class_list_vbc = nullptr;
+	Tree *class_list = nullptr;
+	VBoxContainer *property_list_vbc = nullptr;
+	Tree *property_list = nullptr;
+	EditorHelpBit *description_bit = nullptr;
+	Label *no_profile_selected_help = nullptr;
 
-	EditorFileDialog *import_profiles;
-	EditorFileDialog *export_profile;
+	EditorFileDialog *import_profiles = nullptr;
+	EditorFileDialog *export_profile = nullptr;
 
 	void _profile_action(int p_action);
 	void _profile_selected(int p_what);
@@ -163,7 +163,7 @@ class EditorFeatureProfileManager : public AcceptDialog {
 	void _property_item_edited();
 	void _save_and_update();
 
-	Timer *update_timer;
+	Timer *update_timer = nullptr;
 	void _emit_current_profile_changed();
 
 	static EditorFeatureProfileManager *singleton;
diff --git a/editor/editor_file_dialog.h b/editor/editor_file_dialog.h
index a747255ce86e..07af8c54354c 100644
--- a/editor/editor_file_dialog.h
+++ b/editor/editor_file_dialog.h
@@ -84,50 +84,50 @@ private:
 		ITEM_MENU_SHOW_IN_EXPLORER
 	};
 
-	ConfirmationDialog *makedialog;
-	LineEdit *makedirname;
+	ConfirmationDialog *makedialog = nullptr;
+	LineEdit *makedirname = nullptr;
 
-	Button *makedir;
+	Button *makedir = nullptr;
 	Access access;
 
-	VBoxContainer *vbox;
+	VBoxContainer *vbox = nullptr;
 	FileMode mode;
 	bool can_create_dir;
-	LineEdit *dir;
+	LineEdit *dir = nullptr;
 
-	Button *dir_prev;
-	Button *dir_next;
-	Button *dir_up;
+	Button *dir_prev = nullptr;
+	Button *dir_next = nullptr;
+	Button *dir_up = nullptr;
 
-	HBoxContainer *drives_container;
-	HBoxContainer *shortcuts_container;
-	OptionButton *drives;
-	ItemList *item_list;
-	PopupMenu *item_menu;
-	TextureRect *preview;
-	VBoxContainer *preview_vb;
-	HSplitContainer *list_hb;
-	HBoxContainer *file_box;
-	LineEdit *file;
-	OptionButton *filter;
-	AcceptDialog *error_dialog;
-	DirAccess *dir_access;
-	ConfirmationDialog *confirm_save;
-	DependencyRemoveDialog *dep_remove_dialog;
-	ConfirmationDialog *global_remove_dialog;
+	HBoxContainer *drives_container = nullptr;
+	HBoxContainer *shortcuts_container = nullptr;
+	OptionButton *drives = nullptr;
+	ItemList *item_list = nullptr;
+	PopupMenu *item_menu = nullptr;
+	TextureRect *preview = nullptr;
+	VBoxContainer *preview_vb = nullptr;
+	HSplitContainer *list_hb = nullptr;
+	HBoxContainer *file_box = nullptr;
+	LineEdit *file = nullptr;
+	OptionButton *filter = nullptr;
+	AcceptDialog *error_dialog = nullptr;
+	DirAccess *dir_access = nullptr;
+	ConfirmationDialog *confirm_save = nullptr;
+	DependencyRemoveDialog *dep_remove_dialog = nullptr;
+	ConfirmationDialog *global_remove_dialog = nullptr;
 
-	Button *mode_thumbnails;
-	Button *mode_list;
+	Button *mode_thumbnails = nullptr;
+	Button *mode_list = nullptr;
 
-	Button *refresh;
-	Button *favorite;
-	Button *show_hidden;
+	Button *refresh = nullptr;
+	Button *favorite = nullptr;
+	Button *show_hidden = nullptr;
 
-	Button *fav_up;
-	Button *fav_down;
+	Button *fav_up = nullptr;
+	Button *fav_down = nullptr;
 
-	ItemList *favorites;
-	ItemList *recent;
+	ItemList *favorites = nullptr;
+	ItemList *recent = nullptr;
 
 	Vector<String> local_history;
 	int local_history_pos;
diff --git a/editor/editor_file_system.h b/editor/editor_file_system.h
index 0ddac6583919..05b55d4e1b0f 100644
--- a/editor/editor_file_system.h
+++ b/editor/editor_file_system.h
@@ -49,7 +49,7 @@ class EditorFileSystemDirectory : public Object {
 	uint64_t modified_time;
 	bool verified = false; //used for checking changes
 
-	EditorFileSystemDirectory *parent;
+	EditorFileSystemDirectory *parent = nullptr;
 	Vector<EditorFileSystemDirectory *> subdirs;
 
 	struct FileInfo {
@@ -167,7 +167,7 @@ class EditorFileSystem : public Node {
 	Thread thread;
 	static void _thread_func(void *_userdata);
 
-	EditorFileSystemDirectory *new_filesystem;
+	EditorFileSystemDirectory *new_filesystem = nullptr;
 
 	bool abort_scan = false;
 	bool scanning = false;
@@ -184,7 +184,7 @@ class EditorFileSystem : public Node {
 
 	void _save_late_updated_files();
 
-	EditorFileSystemDirectory *filesystem;
+	EditorFileSystemDirectory *filesystem = nullptr;
 
 	static EditorFileSystem *singleton;
 
diff --git a/editor/editor_help.h b/editor/editor_help.h
index b40d1709b637..054fd84af69d 100644
--- a/editor/editor_help.h
+++ b/editor/editor_help.h
@@ -47,14 +47,14 @@
 class FindBar : public HBoxContainer {
 	GDCLASS(FindBar, HBoxContainer);
 
-	LineEdit *search_text;
-	Button *find_prev;
-	Button *find_next;
-	Label *matches_label;
-	TextureButton *hide_button;
+	LineEdit *search_text = nullptr;
+	Button *find_prev = nullptr;
+	Button *find_next = nullptr;
+	Label *matches_label = nullptr;
+	TextureButton *hide_button = nullptr;
 	String prev_search;
 
-	RichTextLabel *rich_text_label;
+	RichTextLabel *rich_text_label = nullptr;
 
 	int results_count;
 
@@ -114,15 +114,15 @@ class EditorHelp : public VBoxContainer {
 	Map<String, Map<String, int>> enum_values_line;
 	int description_line;
 
-	RichTextLabel *class_desc;
-	HSplitContainer *h_split;
+	RichTextLabel *class_desc = nullptr;
+	HSplitContainer *h_split = nullptr;
 	static DocTools *doc;
 
-	ConfirmationDialog *search_dialog;
-	LineEdit *search;
-	FindBar *find_bar;
-	HBoxContainer *status_bar;
-	Button *toggle_scripts_button;
+	ConfirmationDialog *search_dialog = nullptr;
+	LineEdit *search = nullptr;
+	FindBar *find_bar = nullptr;
+	HBoxContainer *status_bar = nullptr;
+	Button *toggle_scripts_button = nullptr;
 
 	String base_path;
 
@@ -210,7 +210,7 @@ public:
 class EditorHelpBit : public MarginContainer {
 	GDCLASS(EditorHelpBit, MarginContainer);
 
-	RichTextLabel *rich_text;
+	RichTextLabel *rich_text = nullptr;
 	void _go_to_help(String p_what);
 	void _meta_clicked(String p_select);
 
diff --git a/editor/editor_help_search.h b/editor/editor_help_search.h
index bf69fe169305..d89bb0959c01 100644
--- a/editor/editor_help_search.h
+++ b/editor/editor_help_search.h
@@ -55,11 +55,11 @@ class EditorHelpSearch : public ConfirmationDialog {
 		SEARCH_SHOW_HIERARCHY = 1 << 30
 	};
 
-	LineEdit *search_box;
-	Button *case_sensitive_button;
-	Button *hierarchy_button;
-	OptionButton *filter_combo;
-	Tree *results_tree;
+	LineEdit *search_box = nullptr;
+	Button *case_sensitive_button = nullptr;
+	Button *hierarchy_button = nullptr;
+	OptionButton *filter_combo = nullptr;
+	Tree *results_tree = nullptr;
 	bool old_search = false;
 	String old_term;
 
@@ -114,8 +114,8 @@ class EditorHelpSearch::Runner : public RefCounted {
 		}
 	};
 
-	Control *ui_service;
-	Tree *results_tree;
+	Control *ui_service = nullptr;
+	Tree *results_tree = nullptr;
 	String term;
 	int search_flags;
 
diff --git a/editor/editor_inspector.h b/editor/editor_inspector.h
index 87703564b99e..c9e8a1672e78 100644
--- a/editor/editor_inspector.h
+++ b/editor/editor_inspector.h
@@ -68,7 +68,7 @@ private:
 	String label;
 	int text_size;
 	friend class EditorInspector;
-	Object *object;
+	Object *object = nullptr;
 	StringName property;
 	String property_path;
 
@@ -111,9 +111,9 @@ private:
 	float split_ratio;
 
 	Vector<Control *> focusables;
-	Control *label_reference;
-	Control *bottom_editor;
-	PopupMenu *menu;
+	Control *label_reference = nullptr;
+	Control *bottom_editor = nullptr;
+	PopupMenu *menu = nullptr;
 
 	mutable String tooltip_text;
 
@@ -269,14 +269,14 @@ class EditorInspectorSection : public Container {
 	bool foldable = false;
 	int indent_depth = 0;
 
-	Timer *dropping_unfold_timer;
+	Timer *dropping_unfold_timer = nullptr;
 	bool dropping = false;
 
 	void _test_unfold();
 
 protected:
 	Object *object = nullptr;
-	VBoxContainer *vbox;
+	VBoxContainer *vbox = nullptr;
 
 	void _notification(int p_what);
 	static void _bind_methods();
@@ -297,7 +297,7 @@ public:
 class EditorInspectorArray : public EditorInspectorSection {
 	GDCLASS(EditorInspectorArray, EditorInspectorSection);
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	enum Mode {
 		MODE_NONE,
@@ -309,16 +309,16 @@ class EditorInspectorArray : public EditorInspectorSection {
 
 	int count = 0;
 
-	VBoxContainer *elements_vbox;
+	VBoxContainer *elements_vbox = nullptr;
 
-	Control *control_dropping;
+	Control *control_dropping = nullptr;
 	bool dropping = false;
 
-	Button *add_button;
+	Button *add_button = nullptr;
 
-	AcceptDialog *resize_dialog;
+	AcceptDialog *resize_dialog = nullptr;
 	int new_size = 0;
-	LineEdit *new_size_line_edit;
+	LineEdit *new_size_line_edit = nullptr;
 
 	// Pagination
 	int page_length = 5;
@@ -337,14 +337,14 @@ class EditorInspectorArray : public EditorInspectorSection {
 		OPTION_RESIZE_ARRAY,
 	};
 	int popup_array_index_pressed = -1;
-	PopupMenu *rmb_popup;
+	PopupMenu *rmb_popup = nullptr;
 
 	struct ArrayElement {
-		PanelContainer *panel;
-		MarginContainer *margin;
-		HBoxContainer *hbox;
-		TextureRect *move_texture_rect;
-		VBoxContainer *vbox;
+		PanelContainer *panel = nullptr;
+		MarginContainer *margin = nullptr;
+		HBoxContainer *hbox = nullptr;
+		TextureRect *move_texture_rect = nullptr;
+		VBoxContainer *vbox = nullptr;
 	};
 	LocalVector<ArrayElement> array_elements;
 
@@ -399,12 +399,12 @@ class EditorPaginator : public HBoxContainer {
 
 	int page = 0;
 	int max_page = 0;
-	Button *first_page_button;
-	Button *prev_page_button;
-	LineEdit *page_line_edit;
-	Label *page_count_label;
-	Button *next_page_button;
-	Button *last_page_button;
+	Button *first_page_button = nullptr;
+	Button *prev_page_button = nullptr;
+	LineEdit *page_line_edit = nullptr;
+	Label *page_count_label = nullptr;
+	Button *next_page_button = nullptr;
+	Button *last_page_button = nullptr;
 
 	void _first_page_button_pressed();
 	void _prev_page_button_pressed();
@@ -425,14 +425,14 @@ public:
 class EditorInspector : public ScrollContainer {
 	GDCLASS(EditorInspector, ScrollContainer);
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 	enum {
 		MAX_PLUGINS = 1024
 	};
 	static Ref<EditorInspectorPlugin> inspector_plugins[MAX_PLUGINS];
 	static int inspector_plugin_count;
 
-	VBoxContainer *main_vbox;
+	VBoxContainer *main_vbox = nullptr;
 
 	//map use to cache the instantiated editors
 	Map<StringName, List<EditorProperty *>> editor_property_map;
@@ -440,11 +440,11 @@ class EditorInspector : public ScrollContainer {
 	Set<StringName> pending;
 
 	void _clear();
-	Object *object;
+	Object *object = nullptr;
 
 	//
 
-	LineEdit *search_box;
+	LineEdit *search_box = nullptr;
 	bool show_categories = false;
 	bool hide_script = true;
 	bool hide_metadata = true;
diff --git a/editor/editor_layouts_dialog.h b/editor/editor_layouts_dialog.h
index bbdffd67229c..a597ac38cc55 100644
--- a/editor/editor_layouts_dialog.h
+++ b/editor/editor_layouts_dialog.h
@@ -39,9 +39,9 @@ class ItemList;
 class EditorLayoutsDialog : public ConfirmationDialog {
 	GDCLASS(EditorLayoutsDialog, ConfirmationDialog);
 
-	LineEdit *name;
-	ItemList *layout_names;
-	VBoxContainer *makevb;
+	LineEdit *name = nullptr;
+	ItemList *layout_names = nullptr;
+	VBoxContainer *makevb = nullptr;
 
 	void _line_gui_input(const Ref<InputEvent> &p_event);
 
diff --git a/editor/editor_log.h b/editor/editor_log.h
index e66b732ffe5c..267ad406d456 100644
--- a/editor/editor_log.h
+++ b/editor/editor_log.h
@@ -117,23 +117,23 @@ private:
 	// Maps MessageTypes to LogFilters for convenient access and storage (don't need 1 member per filter).
 	Map<MessageType, LogFilter *> type_filter_map;
 
-	RichTextLabel *log;
+	RichTextLabel *log = nullptr;
 
-	Button *clear_button;
-	Button *copy_button;
+	Button *clear_button = nullptr;
+	Button *copy_button = nullptr;
 
-	Button *collapse_button;
+	Button *collapse_button = nullptr;
 	bool collapse = false;
 
-	Button *show_search_button;
-	LineEdit *search_box;
+	Button *show_search_button = nullptr;
+	LineEdit *search_box = nullptr;
 
 	// Reference to the "Output" button on the toolbar so we can update it's icon when
 	// Warnings or Errors are encounetered.
-	Button *tool_button;
+	Button *tool_button = nullptr;
 
 	bool is_loading_state = false; // Used to disable saving requests while loading (some signals from buttons will try trigger a save, which happens during loading).
-	Timer *save_state_timer;
+	Timer *save_state_timer = nullptr;
 
 	static void _error_handler(void *p_self, const char *p_func, const char *p_file, int p_line, const char *p_error, const char *p_errorexp, bool p_editor_notify, ErrorHandlerType p_type);
 
diff --git a/editor/editor_node.h b/editor/editor_node.h
index 7d24cfe758a3..5f09d4e518c1 100644
--- a/editor/editor_node.h
+++ b/editor/editor_node.h
@@ -275,161 +275,161 @@ private:
 	bool _initializing_plugins = false;
 	Map<String, EditorPlugin *> addon_name_to_plugin;
 
-	PanelContainer *scene_root_parent;
-	Control *theme_base;
-	Control *gui_base;
-	VBoxContainer *main_vbox;
-	OptionButton *rendering_driver;
+	PanelContainer *scene_root_parent = nullptr;
+	Control *theme_base = nullptr;
+	Control *gui_base = nullptr;
+	VBoxContainer *main_vbox = nullptr;
+	OptionButton *rendering_driver = nullptr;
 
-	ConfirmationDialog *video_restart_dialog;
+	ConfirmationDialog *video_restart_dialog = nullptr;
 
 	int rendering_driver_current;
 	String rendering_driver_request;
 
 	// Split containers.
-	HSplitContainer *left_l_hsplit;
-	VSplitContainer *left_l_vsplit;
-	HSplitContainer *left_r_hsplit;
-	VSplitContainer *left_r_vsplit;
-	HSplitContainer *main_hsplit;
-	HSplitContainer *right_hsplit;
-	VSplitContainer *right_l_vsplit;
-	VSplitContainer *right_r_vsplit;
-	VSplitContainer *center_split;
+	HSplitContainer *left_l_hsplit = nullptr;
+	VSplitContainer *left_l_vsplit = nullptr;
+	HSplitContainer *left_r_hsplit = nullptr;
+	VSplitContainer *left_r_vsplit = nullptr;
+	HSplitContainer *main_hsplit = nullptr;
+	HSplitContainer *right_hsplit = nullptr;
+	VSplitContainer *right_l_vsplit = nullptr;
+	VSplitContainer *right_r_vsplit = nullptr;
+	VSplitContainer *center_split = nullptr;
 	// To access those easily by index.
 	Vector<VSplitContainer *> vsplits;
 	Vector<HSplitContainer *> hsplits;
 
 	// Main tabs.
-	TabBar *scene_tabs;
-	PopupMenu *scene_tabs_context_menu;
-	Panel *tab_preview_panel;
-	TextureRect *tab_preview;
+	TabBar *scene_tabs = nullptr;
+	PopupMenu *scene_tabs_context_menu = nullptr;
+	Panel *tab_preview_panel = nullptr;
+	TextureRect *tab_preview = nullptr;
 	int tab_closing_idx;
 
 	bool exiting = false;
 	bool dimmed = false;
 
 	int old_split_ofs;
-	VSplitContainer *top_split;
-	HBoxContainer *bottom_hb;
-	Control *vp_base;
+	VSplitContainer *top_split = nullptr;
+	HBoxContainer *bottom_hb = nullptr;
+	Control *vp_base = nullptr;
 
-	HBoxContainer *menu_hb;
-	Control *main_control;
-	MenuButton *file_menu;
-	MenuButton *project_menu;
-	MenuButton *debug_menu;
-	MenuButton *settings_menu;
-	MenuButton *help_menu;
-	PopupMenu *tool_menu;
-	Button *export_button;
-	Button *prev_scene;
-	Button *play_button;
-	Button *pause_button;
-	Button *stop_button;
-	Button *run_settings_button;
-	Button *play_scene_button;
-	Button *play_custom_scene_button;
-	Button *search_button;
-	TextureProgressBar *audio_vu;
+	HBoxContainer *menu_hb = nullptr;
+	Control *main_control = nullptr;
+	MenuButton *file_menu = nullptr;
+	MenuButton *project_menu = nullptr;
+	MenuButton *debug_menu = nullptr;
+	MenuButton *settings_menu = nullptr;
+	MenuButton *help_menu = nullptr;
+	PopupMenu *tool_menu = nullptr;
+	Button *export_button = nullptr;
+	Button *prev_scene = nullptr;
+	Button *play_button = nullptr;
+	Button *pause_button = nullptr;
+	Button *stop_button = nullptr;
+	Button *run_settings_button = nullptr;
+	Button *play_scene_button = nullptr;
+	Button *play_custom_scene_button = nullptr;
+	Button *search_button = nullptr;
+	TextureProgressBar *audio_vu = nullptr;
 
-	Timer *screenshot_timer;
+	Timer *screenshot_timer = nullptr;
 
-	PluginConfigDialog *plugin_config_dialog;
+	PluginConfigDialog *plugin_config_dialog = nullptr;
 
-	RichTextLabel *load_errors;
-	AcceptDialog *load_error_dialog;
+	RichTextLabel *load_errors = nullptr;
+	AcceptDialog *load_error_dialog = nullptr;
 
-	RichTextLabel *execute_outputs;
-	AcceptDialog *execute_output_dialog;
+	RichTextLabel *execute_outputs = nullptr;
+	AcceptDialog *execute_output_dialog = nullptr;
 
 	Ref<Theme> theme;
 
-	PopupMenu *recent_scenes;
+	PopupMenu *recent_scenes = nullptr;
 	String _recent_scene;
 	List<String> previous_scenes;
 	String defer_load_scene;
-	Node *_last_instantiated_scene;
+	Node *_last_instantiated_scene = nullptr;
 
-	ConfirmationDialog *confirmation;
-	ConfirmationDialog *save_confirmation;
-	ConfirmationDialog *import_confirmation;
-	ConfirmationDialog *pick_main_scene;
-	Button *select_current_scene_button;
-	AcceptDialog *accept;
-	AcceptDialog *save_accept;
-	EditorAbout *about;
-	AcceptDialog *warning;
+	ConfirmationDialog *confirmation = nullptr;
+	ConfirmationDialog *save_confirmation = nullptr;
+	ConfirmationDialog *import_confirmation = nullptr;
+	ConfirmationDialog *pick_main_scene = nullptr;
+	Button *select_current_scene_button = nullptr;
+	AcceptDialog *accept = nullptr;
+	AcceptDialog *save_accept = nullptr;
+	EditorAbout *about = nullptr;
+	AcceptDialog *warning = nullptr;
 
 	int overridden_default_layout;
 	Ref<ConfigFile> default_layout;
-	PopupMenu *editor_layouts;
-	EditorLayoutsDialog *layout_dialog;
+	PopupMenu *editor_layouts = nullptr;
+	EditorLayoutsDialog *layout_dialog = nullptr;
 
-	ConfirmationDialog *custom_build_manage_templates;
-	ConfirmationDialog *install_android_build_template;
-	ConfirmationDialog *remove_android_build_template;
+	ConfirmationDialog *custom_build_manage_templates = nullptr;
+	ConfirmationDialog *install_android_build_template = nullptr;
+	ConfirmationDialog *remove_android_build_template = nullptr;
 
-	PopupMenu *vcs_actions_menu;
-	EditorFileDialog *file;
-	ExportTemplateManager *export_template_manager;
-	EditorFeatureProfileManager *feature_profile_manager;
-	EditorFileDialog *file_templates;
-	EditorFileDialog *file_export_lib;
-	EditorFileDialog *file_script;
-	EditorFileDialog *file_android_build_source;
-	CheckBox *file_export_lib_merge;
-	CheckBox *file_export_lib_apply_xforms;
+	PopupMenu *vcs_actions_menu = nullptr;
+	EditorFileDialog *file = nullptr;
+	ExportTemplateManager *export_template_manager = nullptr;
+	EditorFeatureProfileManager *feature_profile_manager = nullptr;
+	EditorFileDialog *file_templates = nullptr;
+	EditorFileDialog *file_export_lib = nullptr;
+	EditorFileDialog *file_script = nullptr;
+	EditorFileDialog *file_android_build_source = nullptr;
+	CheckBox *file_export_lib_merge = nullptr;
+	CheckBox *file_export_lib_apply_xforms = nullptr;
 	String current_path;
-	MenuButton *update_spinner;
+	MenuButton *update_spinner = nullptr;
 
-	HBoxContainer *main_editor_button_vb;
+	HBoxContainer *main_editor_button_vb = nullptr;
 	Vector<Button *> main_editor_buttons;
 	Vector<EditorPlugin *> editor_table;
 
-	AudioStreamPreviewGenerator *audio_preview_gen;
-	ProgressDialog *progress_dialog;
-	BackgroundProgress *progress_hb;
+	AudioStreamPreviewGenerator *audio_preview_gen = nullptr;
+	ProgressDialog *progress_dialog = nullptr;
+	BackgroundProgress *progress_hb = nullptr;
 
-	DependencyErrorDialog *dependency_error;
+	DependencyErrorDialog *dependency_error = nullptr;
 	Map<String, Set<String>> dependency_errors;
-	DependencyEditor *dependency_fixer;
-	OrphanResourcesDialog *orphan_resources;
-	ConfirmationDialog *open_imported;
-	Button *new_inherited_button;
+	DependencyEditor *dependency_fixer = nullptr;
+	OrphanResourcesDialog *orphan_resources = nullptr;
+	ConfirmationDialog *open_imported = nullptr;
+	Button *new_inherited_button = nullptr;
 	String open_import_request;
 
 	Vector<Control *> floating_docks;
 
-	Button *dock_float;
-	Button *dock_tab_move_left;
-	Button *dock_tab_move_right;
-	Control *dock_select;
-	PopupPanel *dock_select_popup;
+	Button *dock_float = nullptr;
+	Button *dock_tab_move_left = nullptr;
+	Button *dock_tab_move_right = nullptr;
+	Control *dock_select = nullptr;
+	PopupPanel *dock_select_popup = nullptr;
 	Rect2 dock_select_rect[DOCK_SLOT_MAX];
 	TabContainer *dock_slot[DOCK_SLOT_MAX];
-	Timer *dock_drag_timer;
+	Timer *dock_drag_timer = nullptr;
 	bool docks_visible = true;
 	int dock_popup_selected_idx;
 	int dock_select_rect_over_idx;
 
-	HBoxContainer *tabbar_container;
-	Button *distraction_free;
-	Button *scene_tab_add;
-	Control *scene_tab_add_ph;
+	HBoxContainer *tabbar_container = nullptr;
+	Button *distraction_free = nullptr;
+	Button *scene_tab_add = nullptr;
+	Control *scene_tab_add_ph = nullptr;
 
 	Vector<BottomPanelItem> bottom_panel_items;
-	PanelContainer *bottom_panel;
-	HBoxContainer *bottom_panel_hb;
-	HBoxContainer *bottom_panel_hb_editors;
-	VBoxContainer *bottom_panel_vb;
-	EditorToaster *editor_toaster;
-	LinkButton *version_btn;
-	Button *bottom_panel_raise;
+	PanelContainer *bottom_panel = nullptr;
+	HBoxContainer *bottom_panel_hb = nullptr;
+	HBoxContainer *bottom_panel_hb_editors = nullptr;
+	VBoxContainer *bottom_panel_vb = nullptr;
+	EditorToaster *editor_toaster = nullptr;
+	LinkButton *version_btn = nullptr;
+	Button *bottom_panel_raise = nullptr;
 
-	Tree *disk_changed_list;
-	ConfirmationDialog *disk_changed;
+	Tree *disk_changed_list = nullptr;
+	ConfirmationDialog *disk_changed = nullptr;
 
 	bool scene_distraction_free = false;
 	bool script_distraction_free = false;
@@ -447,8 +447,8 @@ private:
 
 	int current_menu_option;
 
-	SubViewport *scene_root; // Root of the scene being edited.
-	Object *current;
+	SubViewport *scene_root = nullptr; // Root of the scene being edited.
+	Object *current = nullptr;
 
 	Ref<Resource> saving_resource;
 
@@ -464,8 +464,8 @@ private:
 	uint64_t saved_version;
 	uint64_t last_checked_version;
 
-	DynamicFontImportSettings *fontdata_import_settings;
-	SceneImportSettings *scene_import_settings;
+	DynamicFontImportSettings *fontdata_import_settings = nullptr;
+	SceneImportSettings *scene_import_settings = nullptr;
 
 	String import_reload_fn;
 
diff --git a/editor/editor_path.h b/editor/editor_path.h
index 1e19344d9eae..afc7a20bad5b 100644
--- a/editor/editor_path.h
+++ b/editor/editor_path.h
@@ -42,12 +42,12 @@ class EditorSelectionHistory;
 class EditorPath : public Button {
 	GDCLASS(EditorPath, Button);
 
-	EditorSelectionHistory *history;
+	EditorSelectionHistory *history = nullptr;
 
-	TextureRect *current_object_icon;
-	Label *current_object_label;
-	TextureRect *sub_objects_icon;
-	PopupMenu *sub_objects_menu;
+	TextureRect *current_object_icon = nullptr;
+	Label *current_object_label = nullptr;
+	TextureRect *sub_objects_icon = nullptr;
+	PopupMenu *sub_objects_menu = nullptr;
 
 	Vector<ObjectID> objects;
 
diff --git a/editor/editor_plugin_settings.h b/editor/editor_plugin_settings.h
index c239b735dead..826bb8c00f50 100644
--- a/editor/editor_plugin_settings.h
+++ b/editor/editor_plugin_settings.h
@@ -44,10 +44,10 @@ class EditorPluginSettings : public VBoxContainer {
 		BUTTON_PLUGIN_EDIT
 	};
 
-	PluginConfigDialog *plugin_config_dialog;
-	Button *create_plugin;
-	Button *update_list;
-	Tree *plugin_list;
+	PluginConfigDialog *plugin_config_dialog = nullptr;
+	Button *create_plugin = nullptr;
+	Button *update_list = nullptr;
+	Tree *plugin_list = nullptr;
 	bool updating = false;
 
 	void _plugin_activity_changed();
diff --git a/editor/editor_properties.h b/editor/editor_properties.h
index c21e0e0b4d46..1f40a7fe7b4e 100644
--- a/editor/editor_properties.h
+++ b/editor/editor_properties.h
@@ -52,7 +52,7 @@ public:
 
 class EditorPropertyText : public EditorProperty {
 	GDCLASS(EditorPropertyText, EditorProperty);
-	LineEdit *text;
+	LineEdit *text = nullptr;
 
 	bool updating = false;
 	bool string_name = false;
@@ -72,11 +72,11 @@ public:
 
 class EditorPropertyMultilineText : public EditorProperty {
 	GDCLASS(EditorPropertyMultilineText, EditorProperty);
-	TextEdit *text;
+	TextEdit *text = nullptr;
 
-	AcceptDialog *big_text_dialog;
-	TextEdit *big_text;
-	Button *open_big_text;
+	AcceptDialog *big_text_dialog = nullptr;
+	TextEdit *big_text = nullptr;
+	Button *open_big_text = nullptr;
 
 	void _big_text_changed();
 	void _text_changed();
@@ -95,15 +95,15 @@ public:
 class EditorPropertyTextEnum : public EditorProperty {
 	GDCLASS(EditorPropertyTextEnum, EditorProperty);
 
-	HBoxContainer *default_layout;
-	HBoxContainer *edit_custom_layout;
+	HBoxContainer *default_layout = nullptr;
+	HBoxContainer *edit_custom_layout = nullptr;
 
-	OptionButton *option_button;
-	Button *edit_button;
+	OptionButton *option_button = nullptr;
+	Button *edit_button = nullptr;
 
-	LineEdit *custom_value_edit;
-	Button *accept_button;
-	Button *cancel_button;
+	LineEdit *custom_value_edit = nullptr;
+	Button *accept_button = nullptr;
+	Button *cancel_button = nullptr;
 
 	Vector<String> options;
 	bool string_name = false;
@@ -134,9 +134,9 @@ class EditorPropertyPath : public EditorProperty {
 	bool folder = false;
 	bool global = false;
 	bool save_mode = false;
-	EditorFileDialog *dialog;
-	LineEdit *path;
-	Button *path_edit;
+	EditorFileDialog *dialog = nullptr;
+	LineEdit *path = nullptr;
+	Button *path_edit = nullptr;
 
 	void _path_selected(const String &p_path);
 	void _path_pressed();
@@ -156,9 +156,9 @@ public:
 
 class EditorPropertyLocale : public EditorProperty {
 	GDCLASS(EditorPropertyLocale, EditorProperty);
-	EditorLocaleDialog *dialog;
-	LineEdit *locale;
-	Button *locale_edit;
+	EditorLocaleDialog *dialog = nullptr;
+	LineEdit *locale = nullptr;
+	Button *locale_edit = nullptr;
 
 	void _locale_selected(const String &p_locale);
 	void _locale_pressed();
@@ -178,8 +178,8 @@ class EditorPropertyClassName : public EditorProperty {
 	GDCLASS(EditorPropertyClassName, EditorProperty);
 
 private:
-	CreateDialog *dialog;
-	Button *property;
+	CreateDialog *dialog = nullptr;
+	Button *property = nullptr;
 	String selected_type;
 	String base_type;
 	void _property_selected();
@@ -212,8 +212,8 @@ public:
 
 private:
 	Type hint;
-	PropertySelector *selector;
-	Button *property;
+	PropertySelector *selector = nullptr;
+	Button *property = nullptr;
 	String hint_text;
 
 	void _property_selected(const String &p_selected);
@@ -231,7 +231,7 @@ public:
 
 class EditorPropertyCheck : public EditorProperty {
 	GDCLASS(EditorPropertyCheck, EditorProperty);
-	CheckBox *checkbox;
+	CheckBox *checkbox = nullptr;
 
 	void _checkbox_pressed();
 
@@ -246,7 +246,7 @@ public:
 
 class EditorPropertyEnum : public EditorProperty {
 	GDCLASS(EditorPropertyEnum, EditorProperty);
-	OptionButton *options;
+	OptionButton *options = nullptr;
 
 	void _option_selected(int p_which);
 
@@ -263,7 +263,7 @@ public:
 
 class EditorPropertyFlags : public EditorProperty {
 	GDCLASS(EditorPropertyFlags, EditorProperty);
-	VBoxContainer *vbox;
+	VBoxContainer *vbox = nullptr;
 	Vector<CheckBox *> flags;
 	Vector<int> flag_indices;
 
@@ -293,9 +293,9 @@ private:
 	int hovered_index = -1;
 	bool read_only = false;
 	int renamed_layer_index = -1;
-	PopupMenu *layer_rename;
-	ConfirmationDialog *rename_dialog;
-	LineEdit *rename_dialog_text;
+	PopupMenu *layer_rename = nullptr;
+	ConfirmationDialog *rename_dialog = nullptr;
+	LineEdit *rename_dialog_text = nullptr;
 
 	void _rename_pressed(int p_menu);
 	void _rename_operation_confirm();
@@ -334,12 +334,12 @@ public:
 	};
 
 private:
-	EditorPropertyLayersGrid *grid;
+	EditorPropertyLayersGrid *grid = nullptr;
 	void _grid_changed(uint32_t p_grid);
 	String basename;
 	LayerType layer_type;
-	PopupMenu *layers;
-	Button *button;
+	PopupMenu *layers = nullptr;
+	Button *button = nullptr;
 
 	void _button_pressed();
 	void _menu_pressed(int p_menu);
@@ -358,7 +358,7 @@ public:
 
 class EditorPropertyInteger : public EditorProperty {
 	GDCLASS(EditorPropertyInteger, EditorProperty);
-	EditorSpinSlider *spin;
+	EditorSpinSlider *spin = nullptr;
 	bool setting = false;
 	void _value_changed(int64_t p_val);
 
@@ -374,7 +374,7 @@ public:
 
 class EditorPropertyObjectID : public EditorProperty {
 	GDCLASS(EditorPropertyObjectID, EditorProperty);
-	Button *edit;
+	Button *edit = nullptr;
 	String base_type;
 	void _edit_pressed();
 
@@ -390,7 +390,7 @@ public:
 
 class EditorPropertyFloat : public EditorProperty {
 	GDCLASS(EditorPropertyFloat, EditorProperty);
-	EditorSpinSlider *spin;
+	EditorSpinSlider *spin = nullptr;
 	bool setting = false;
 	bool angle_in_radians = false;
 	void _value_changed(double p_val);
@@ -407,9 +407,9 @@ public:
 
 class EditorPropertyEasing : public EditorProperty {
 	GDCLASS(EditorPropertyEasing, EditorProperty);
-	Control *easing_draw;
-	PopupMenu *preset;
-	EditorSpinSlider *spin;
+	Control *easing_draw = nullptr;
+	PopupMenu *preset = nullptr;
+	EditorSpinSlider *spin = nullptr;
 	bool setting = false;
 
 	bool dragging = false;
@@ -657,7 +657,7 @@ public:
 
 class EditorPropertyColor : public EditorProperty {
 	GDCLASS(EditorPropertyColor, EditorProperty);
-	ColorPickerButton *picker;
+	ColorPickerButton *picker = nullptr;
 	void _color_changed(const Color &p_color);
 	void _popup_closed();
 	void _picker_created();
@@ -677,9 +677,9 @@ public:
 
 class EditorPropertyNodePath : public EditorProperty {
 	GDCLASS(EditorPropertyNodePath, EditorProperty);
-	Button *assign;
-	Button *clear;
-	SceneTreeDialog *scene_tree;
+	Button *assign = nullptr;
+	Button *clear = nullptr;
+	SceneTreeDialog *scene_tree = nullptr;
 	NodePath base_hint;
 	bool use_path_from_scene_root = false;
 
@@ -705,7 +705,7 @@ public:
 
 class EditorPropertyRID : public EditorProperty {
 	GDCLASS(EditorPropertyRID, EditorProperty);
-	Label *label;
+	Label *label = nullptr;
 
 public:
 	virtual void update_property() override;
diff --git a/editor/editor_properties_array_dict.h b/editor/editor_properties_array_dict.h
index 3d9fe90b200f..070353c53887 100644
--- a/editor/editor_properties_array_dict.h
+++ b/editor/editor_properties_array_dict.h
@@ -80,7 +80,7 @@ public:
 class EditorPropertyArray : public EditorProperty {
 	GDCLASS(EditorPropertyArray, EditorProperty);
 
-	PopupMenu *change_type;
+	PopupMenu *change_type = nullptr;
 	bool updating = false;
 	bool dropping = false;
 
@@ -88,12 +88,12 @@ class EditorPropertyArray : public EditorProperty {
 	int page_length = 20;
 	int page_index = 0;
 	int changing_type_index;
-	Button *edit;
-	VBoxContainer *vbox;
-	VBoxContainer *property_vbox;
-	EditorSpinSlider *size_slider;
-	Button *button_add_item;
-	EditorPaginator *paginator;
+	Button *edit = nullptr;
+	VBoxContainer *vbox = nullptr;
+	VBoxContainer *property_vbox = nullptr;
+	EditorSpinSlider *size_slider = nullptr;
+	Button *button_add_item = nullptr;
+	EditorPaginator *paginator = nullptr;
 	Variant::Type array_type;
 	Variant::Type subtype;
 	PropertyHint subtype_hint;
@@ -138,19 +138,19 @@ public:
 class EditorPropertyDictionary : public EditorProperty {
 	GDCLASS(EditorPropertyDictionary, EditorProperty);
 
-	PopupMenu *change_type;
+	PopupMenu *change_type = nullptr;
 	bool updating = false;
 
 	Ref<EditorPropertyDictionaryObject> object;
 	int page_length = 20;
 	int page_index = 0;
 	int changing_type_index;
-	Button *edit;
-	VBoxContainer *vbox;
-	VBoxContainer *property_vbox;
-	EditorSpinSlider *size_slider;
-	Button *button_add_item;
-	EditorPaginator *paginator;
+	Button *edit = nullptr;
+	VBoxContainer *vbox = nullptr;
+	VBoxContainer *property_vbox = nullptr;
+	EditorSpinSlider *size_slider = nullptr;
+	Button *button_add_item = nullptr;
+	EditorPaginator *paginator = nullptr;
 
 	void _page_changed(int p_page);
 	void _edit_pressed();
@@ -173,19 +173,19 @@ public:
 class EditorPropertyLocalizableString : public EditorProperty {
 	GDCLASS(EditorPropertyLocalizableString, EditorProperty);
 
-	EditorLocaleDialog *locale_select;
+	EditorLocaleDialog *locale_select = nullptr;
 
 	bool updating;
 
 	Ref<EditorPropertyDictionaryObject> object;
 	int page_length = 20;
 	int page_index = 0;
-	Button *edit;
-	VBoxContainer *vbox;
-	VBoxContainer *property_vbox;
-	EditorSpinSlider *size_slider;
-	Button *button_add_item;
-	EditorPaginator *paginator;
+	Button *edit = nullptr;
+	VBoxContainer *vbox = nullptr;
+	VBoxContainer *property_vbox = nullptr;
+	EditorSpinSlider *size_slider = nullptr;
+	Button *button_add_item = nullptr;
+	EditorPaginator *paginator = nullptr;
 
 	void _page_changed(int p_page);
 	void _edit_pressed();
diff --git a/editor/editor_resource_picker.h b/editor/editor_resource_picker.h
index a6eff760e736..cd7e507984ca 100644
--- a/editor/editor_resource_picker.h
+++ b/editor/editor_resource_picker.h
@@ -52,9 +52,9 @@ class EditorResourcePicker : public HBoxContainer {
 
 	Vector<String> inheritors_array;
 
-	Button *assign_button;
-	TextureRect *preview_rect;
-	Button *edit_button;
+	Button *assign_button = nullptr;
+	TextureRect *preview_rect = nullptr;
+	Button *edit_button = nullptr;
 	EditorFileDialog *file_dialog = nullptr;
 	EditorQuickOpen *quick_open = nullptr;
 
diff --git a/editor/editor_run_script.h b/editor/editor_run_script.h
index 28a854aaeb33..a2399bd780db 100644
--- a/editor/editor_run_script.h
+++ b/editor/editor_run_script.h
@@ -39,7 +39,7 @@ class EditorNode;
 class EditorScript : public RefCounted {
 	GDCLASS(EditorScript, RefCounted);
 
-	EditorNode *editor;
+	EditorNode *editor = nullptr;
 
 protected:
 	static void _bind_methods();
diff --git a/editor/editor_sectioned_inspector.h b/editor/editor_sectioned_inspector.h
index 7c21e00c037b..0ccffa00486b 100644
--- a/editor/editor_sectioned_inspector.h
+++ b/editor/editor_sectioned_inspector.h
@@ -42,11 +42,11 @@ class SectionedInspector : public HSplitContainer {
 
 	ObjectID obj;
 
-	Tree *sections;
-	SectionedInspectorFilter *filter;
+	Tree *sections = nullptr;
+	SectionedInspectorFilter *filter = nullptr;
 
 	Map<String, TreeItem *> section_map;
-	EditorInspector *inspector;
+	EditorInspector *inspector = nullptr;
 	LineEdit *search_box = nullptr;
 
 	String selected_category;
diff --git a/editor/editor_settings_dialog.h b/editor/editor_settings_dialog.h
index e3139bb07acf..42831c9ebd34 100644
--- a/editor/editor_settings_dialog.h
+++ b/editor/editor_settings_dialog.h
@@ -45,13 +45,13 @@ class EditorSettingsDialog : public AcceptDialog {
 
 	bool updating = false;
 
-	TabContainer *tabs;
-	Control *tab_general;
-	Control *tab_shortcuts;
+	TabContainer *tabs = nullptr;
+	Control *tab_general = nullptr;
+	Control *tab_shortcuts = nullptr;
 
-	LineEdit *search_box;
-	LineEdit *shortcut_search_box;
-	SectionedInspector *inspector;
+	LineEdit *search_box = nullptr;
+	LineEdit *shortcut_search_box = nullptr;
+	SectionedInspector *inspector = nullptr;
 
 	// Shortcuts
 	enum ShortcutButton {
@@ -61,19 +61,19 @@ class EditorSettingsDialog : public AcceptDialog {
 		SHORTCUT_REVERT
 	};
 
-	Tree *shortcuts;
+	Tree *shortcuts = nullptr;
 	String shortcut_filter;
 
-	InputEventConfigurationDialog *shortcut_editor;
+	InputEventConfigurationDialog *shortcut_editor = nullptr;
 
 	bool is_editing_action = false;
 	String current_edited_identifier;
 	Array current_events;
 	int current_event_index = -1;
 
-	Timer *timer;
+	Timer *timer = nullptr;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	virtual void cancel_pressed() override;
 	virtual void ok_pressed() override;
@@ -110,10 +110,10 @@ class EditorSettingsDialog : public AcceptDialog {
 
 	static void _undo_redo_callback(void *p_self, const String &p_name);
 
-	Label *restart_label;
-	TextureRect *restart_icon;
-	PanelContainer *restart_container;
-	Button *restart_close_button;
+	Label *restart_label = nullptr;
+	TextureRect *restart_icon = nullptr;
+	PanelContainer *restart_container = nullptr;
+	Button *restart_close_button = nullptr;
 
 	void _editor_restart_request();
 	void _editor_restart();
diff --git a/editor/editor_spin_slider.h b/editor/editor_spin_slider.h
index 405c3bfc220b..fc9f6b8722df 100644
--- a/editor/editor_spin_slider.h
+++ b/editor/editor_spin_slider.h
@@ -44,7 +44,7 @@ class EditorSpinSlider : public Range {
 	bool hover_updown = false;
 	bool mouse_hover = false;
 
-	TextureRect *grabber;
+	TextureRect *grabber = nullptr;
 	int grabber_range;
 
 	bool mouse_over_spin = false;
diff --git a/editor/editor_toaster.h b/editor/editor_toaster.h
index 059245ce662b..791a146a8dc5 100644
--- a/editor/editor_toaster.h
+++ b/editor/editor_toaster.h
@@ -61,11 +61,11 @@ private:
 	Ref<StyleBoxFlat> warning_panel_style_progress;
 	Ref<StyleBoxFlat> error_panel_style_progress;
 
-	Button *main_button;
-	PanelContainer *disable_notifications_panel;
-	Button *disable_notifications_button;
+	Button *main_button = nullptr;
+	PanelContainer *disable_notifications_panel = nullptr;
+	Button *disable_notifications_button = nullptr;
 
-	VBoxContainer *vbox_container;
+	VBoxContainer *vbox_container = nullptr;
 	const int max_temporary_count = 5;
 	struct Toast {
 		Severity severity = SEVERITY_INFO;
diff --git a/editor/editor_zoom_widget.h b/editor/editor_zoom_widget.h
index bf8358ff1ae8..4690a57a2b64 100644
--- a/editor/editor_zoom_widget.h
+++ b/editor/editor_zoom_widget.h
@@ -37,9 +37,9 @@
 class EditorZoomWidget : public HBoxContainer {
 	GDCLASS(EditorZoomWidget, HBoxContainer);
 
-	Button *zoom_minus;
-	Button *zoom_reset;
-	Button *zoom_plus;
+	Button *zoom_minus = nullptr;
+	Button *zoom_reset = nullptr;
+	Button *zoom_plus = nullptr;
 
 	float zoom = 1.0;
 	void _update_zoom_label();
diff --git a/editor/export_template_manager.h b/editor/export_template_manager.h
index cf7585635d2b..61df212f1f20 100644
--- a/editor/export_template_manager.h
+++ b/editor/export_template_manager.h
@@ -51,42 +51,42 @@ class ExportTemplateManager : public AcceptDialog {
 	bool is_downloading_templates = false;
 	float update_countdown = 0;
 
-	Label *current_value;
-	Label *current_missing_label;
-	Label *current_installed_label;
+	Label *current_value = nullptr;
+	Label *current_missing_label = nullptr;
+	Label *current_installed_label = nullptr;
 
-	HBoxContainer *current_installed_hb;
-	LineEdit *current_installed_path;
-	Button *current_open_button;
-	Button *current_uninstall_button;
+	HBoxContainer *current_installed_hb = nullptr;
+	LineEdit *current_installed_path = nullptr;
+	Button *current_open_button = nullptr;
+	Button *current_uninstall_button = nullptr;
 
-	VBoxContainer *install_options_vb;
-	OptionButton *mirrors_list;
+	VBoxContainer *install_options_vb = nullptr;
+	OptionButton *mirrors_list = nullptr;
 
 	enum MirrorAction {
 		VISIT_WEB_MIRROR,
 		COPY_MIRROR_URL,
 	};
 
-	MenuButton *mirror_options_button;
-	HBoxContainer *download_progress_hb;
-	ProgressBar *download_progress_bar;
-	Label *download_progress_label;
-	HTTPRequest *download_templates;
-	Button *install_file_button;
-	HTTPRequest *request_mirrors;
+	MenuButton *mirror_options_button = nullptr;
+	HBoxContainer *download_progress_hb = nullptr;
+	ProgressBar *download_progress_bar = nullptr;
+	Label *download_progress_label = nullptr;
+	HTTPRequest *download_templates = nullptr;
+	Button *install_file_button = nullptr;
+	HTTPRequest *request_mirrors = nullptr;
 
 	enum TemplatesAction {
 		OPEN_TEMPLATE_FOLDER,
 		UNINSTALL_TEMPLATE,
 	};
 
-	Tree *installed_table;
+	Tree *installed_table = nullptr;
 
-	ConfirmationDialog *uninstall_confirm;
+	ConfirmationDialog *uninstall_confirm = nullptr;
 	String uninstall_version;
-	FileDialog *install_file_dialog;
-	AcceptDialog *hide_dialog_accept;
+	FileDialog *install_file_dialog = nullptr;
+	AcceptDialog *hide_dialog_accept = nullptr;
 
 	void _update_template_status();
 
diff --git a/editor/fileserver/editor_file_server.h b/editor/fileserver/editor_file_server.h
index 7807e72800a0..a1bb7ecf4e9b 100644
--- a/editor/fileserver/editor_file_server.h
+++ b/editor/fileserver/editor_file_server.h
@@ -47,7 +47,7 @@ class EditorFileServer : public Object {
 	};
 
 	struct ClientData {
-		Thread *thread;
+		Thread *thread = nullptr;
 		Ref<StreamPeerTCP> connection;
 		Map<int, FileAccess *> files;
 		EditorFileServer *efs = nullptr;
diff --git a/editor/filesystem_dock.h b/editor/filesystem_dock.h
index 92dac374ec0e..15fade2d9547 100644
--- a/editor/filesystem_dock.h
+++ b/editor/filesystem_dock.h
@@ -102,57 +102,57 @@ private:
 
 	FileSortOption file_sort = FILE_SORT_NAME;
 
-	VBoxContainer *scanning_vb;
-	ProgressBar *scanning_progress;
-	VSplitContainer *split_box;
-	VBoxContainer *file_list_vb;
+	VBoxContainer *scanning_vb = nullptr;
+	ProgressBar *scanning_progress = nullptr;
+	VSplitContainer *split_box = nullptr;
+	VBoxContainer *file_list_vb = nullptr;
 
 	Set<String> favorites;
 
-	Button *button_toggle_display_mode;
-	Button *button_reload;
-	Button *button_file_list_display_mode;
-	Button *button_hist_next;
-	Button *button_hist_prev;
-	LineEdit *current_path;
+	Button *button_toggle_display_mode = nullptr;
+	Button *button_reload = nullptr;
+	Button *button_file_list_display_mode = nullptr;
+	Button *button_hist_next = nullptr;
+	Button *button_hist_prev = nullptr;
+	LineEdit *current_path = nullptr;
 
-	HBoxContainer *toolbar2_hbc;
-	LineEdit *tree_search_box;
-	MenuButton *tree_button_sort;
+	HBoxContainer *toolbar2_hbc = nullptr;
+	LineEdit *tree_search_box = nullptr;
+	MenuButton *tree_button_sort = nullptr;
 
-	LineEdit *file_list_search_box;
-	MenuButton *file_list_button_sort;
+	LineEdit *file_list_search_box = nullptr;
+	MenuButton *file_list_button_sort = nullptr;
 
 	String searched_string;
 	Vector<String> uncollapsed_paths_before_search;
 
-	TextureRect *search_icon;
-	HBoxContainer *path_hb;
+	TextureRect *search_icon = nullptr;
+	HBoxContainer *path_hb = nullptr;
 
 	FileListDisplayMode file_list_display_mode;
 	DisplayMode display_mode;
 	DisplayMode old_display_mode;
 
-	PopupMenu *file_list_popup;
-	PopupMenu *tree_popup;
+	PopupMenu *file_list_popup = nullptr;
+	PopupMenu *tree_popup = nullptr;
 
-	DependencyEditor *deps_editor;
-	DependencyEditorOwners *owners_editor;
-	DependencyRemoveDialog *remove_dialog;
+	DependencyEditor *deps_editor = nullptr;
+	DependencyEditorOwners *owners_editor = nullptr;
+	DependencyRemoveDialog *remove_dialog = nullptr;
 
-	EditorDirDialog *move_dialog;
-	ConfirmationDialog *rename_dialog;
-	LineEdit *rename_dialog_text;
-	ConfirmationDialog *duplicate_dialog;
-	LineEdit *duplicate_dialog_text;
-	ConfirmationDialog *make_dir_dialog;
-	LineEdit *make_dir_dialog_text;
-	ConfirmationDialog *make_scene_dialog;
-	LineEdit *make_scene_dialog_text;
-	ConfirmationDialog *overwrite_dialog;
-	ScriptCreateDialog *make_script_dialog;
-	ShaderCreateDialog *make_shader_dialog;
-	CreateDialog *new_resource_dialog;
+	EditorDirDialog *move_dialog = nullptr;
+	ConfirmationDialog *rename_dialog = nullptr;
+	LineEdit *rename_dialog_text = nullptr;
+	ConfirmationDialog *duplicate_dialog = nullptr;
+	LineEdit *duplicate_dialog_text = nullptr;
+	ConfirmationDialog *make_dir_dialog = nullptr;
+	LineEdit *make_dir_dialog_text = nullptr;
+	ConfirmationDialog *make_scene_dialog = nullptr;
+	LineEdit *make_scene_dialog_text = nullptr;
+	ConfirmationDialog *overwrite_dialog = nullptr;
+	ScriptCreateDialog *make_script_dialog = nullptr;
+	ShaderCreateDialog *make_shader_dialog = nullptr;
+	CreateDialog *new_resource_dialog = nullptr;
 
 	bool always_show_folders = false;
 
@@ -181,8 +181,8 @@ private:
 
 	bool updating_tree = false;
 	int tree_update_id;
-	Tree *tree;
-	ItemList *files;
+	Tree *tree = nullptr;
+	ItemList *files = nullptr;
 	bool import_dock_needs_update = false;
 
 	bool holding_branch = false;
diff --git a/editor/find_in_files.h b/editor/find_in_files.h
index cf14f3d5c3f2..9def190b5b75 100644
--- a/editor/find_in_files.h
+++ b/editor/find_in_files.h
@@ -132,18 +132,18 @@ private:
 	void _on_replace_text_submitted(String text);
 
 	FindInFilesMode _mode;
-	LineEdit *_search_text_line_edit;
+	LineEdit *_search_text_line_edit = nullptr;
 
-	Label *_replace_label;
-	LineEdit *_replace_text_line_edit;
+	Label *_replace_label = nullptr;
+	LineEdit *_replace_text_line_edit = nullptr;
 
-	LineEdit *_folder_line_edit;
-	CheckBox *_match_case_checkbox;
-	CheckBox *_whole_words_checkbox;
-	Button *_find_button;
-	Button *_replace_button;
-	FileDialog *_folder_dialog;
-	HBoxContainer *_filters_container;
+	LineEdit *_folder_line_edit = nullptr;
+	CheckBox *_match_case_checkbox = nullptr;
+	CheckBox *_whole_words_checkbox = nullptr;
+	Button *_find_button = nullptr;
+	Button *_replace_button = nullptr;
+	FileDialog *_folder_dialog = nullptr;
+	HBoxContainer *_filters_container = nullptr;
 	HashMap<String, bool> _filters_preferences;
 };
 
@@ -201,20 +201,20 @@ private:
 	void set_progress_visible(bool visible);
 	void clear();
 
-	FindInFiles *_finder;
-	Label *_search_text_label;
-	Tree *_results_display;
-	Label *_status_label;
-	Button *_refresh_button;
-	Button *_cancel_button;
-	ProgressBar *_progress_bar;
+	FindInFiles *_finder = nullptr;
+	Label *_search_text_label = nullptr;
+	Tree *_results_display = nullptr;
+	Label *_status_label = nullptr;
+	Button *_refresh_button = nullptr;
+	Button *_cancel_button = nullptr;
+	ProgressBar *_progress_bar = nullptr;
 	Map<String, TreeItem *> _file_items;
 	Map<TreeItem *, Result> _result_items;
 	bool _with_replace = false;
 
-	HBoxContainer *_replace_container;
-	LineEdit *_replace_line_edit;
-	Button *_replace_all_button;
+	HBoxContainer *_replace_container = nullptr;
+	LineEdit *_replace_line_edit = nullptr;
+	Button *_replace_all_button = nullptr;
 };
 
 #endif // FIND_IN_FILES_H
diff --git a/editor/groups_editor.h b/editor/groups_editor.h
index aa70ac5bc4b2..b6a620401359 100644
--- a/editor/groups_editor.h
+++ b/editor/groups_editor.h
@@ -43,32 +43,32 @@
 class GroupDialog : public AcceptDialog {
 	GDCLASS(GroupDialog, AcceptDialog);
 
-	ConfirmationDialog *error;
+	ConfirmationDialog *error = nullptr;
 
-	SceneTree *scene_tree;
-	TreeItem *groups_root;
+	SceneTree *scene_tree = nullptr;
+	TreeItem *groups_root = nullptr;
 
-	LineEdit *add_group_text;
-	Button *add_group_button;
+	LineEdit *add_group_text = nullptr;
+	Button *add_group_button = nullptr;
 
-	Tree *groups;
+	Tree *groups = nullptr;
 
-	Tree *nodes_to_add;
-	TreeItem *add_node_root;
-	LineEdit *add_filter;
+	Tree *nodes_to_add = nullptr;
+	TreeItem *add_node_root = nullptr;
+	LineEdit *add_filter = nullptr;
 
-	Tree *nodes_to_remove;
-	TreeItem *remove_node_root;
-	LineEdit *remove_filter;
+	Tree *nodes_to_remove = nullptr;
+	TreeItem *remove_node_root = nullptr;
+	LineEdit *remove_filter = nullptr;
 
-	Label *group_empty;
+	Label *group_empty = nullptr;
 
-	Button *add_button;
-	Button *remove_button;
+	Button *add_button = nullptr;
+	Button *remove_button = nullptr;
 
 	String selected_group;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	void _group_selected();
 
@@ -111,15 +111,15 @@ public:
 class GroupsEditor : public VBoxContainer {
 	GDCLASS(GroupsEditor, VBoxContainer);
 
-	Node *node;
+	Node *node = nullptr;
 
-	GroupDialog *group_dialog;
+	GroupDialog *group_dialog = nullptr;
 
-	LineEdit *group_name;
-	Button *add;
-	Tree *tree;
+	LineEdit *group_name = nullptr;
+	Button *add = nullptr;
+	Tree *tree = nullptr;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	void update_tree();
 	void _add_group(const String &p_group = "");
diff --git a/editor/import/dynamic_font_import_settings.h b/editor/import/dynamic_font_import_settings.h
index 7b2a9184a400..c1e868403f2d 100644
--- a/editor/import/dynamic_font_import_settings.h
+++ b/editor/import/dynamic_font_import_settings.h
@@ -66,7 +66,7 @@ class DynamicFontImportSettings : public ConfirmationDialog {
 	List<ResourceImporter::ImportOption> options_variations;
 	List<ResourceImporter::ImportOption> options_general;
 
-	EditorLocaleDialog *locale_select;
+	EditorLocaleDialog *locale_select = nullptr;
 	Vector<String> script_codes;
 
 	// Root layout
diff --git a/editor/import/scene_import_settings.h b/editor/import/scene_import_settings.h
index b51f342729f4..3cf708740b8b 100644
--- a/editor/import/scene_import_settings.h
+++ b/editor/import/scene_import_settings.h
@@ -62,26 +62,26 @@ class SceneImportSettings : public ConfirmationDialog {
 
 	Node *scene = nullptr;
 
-	HSplitContainer *tree_split;
-	HSplitContainer *property_split;
-	TabContainer *data_mode;
-	Tree *scene_tree;
-	Tree *mesh_tree;
-	Tree *material_tree;
+	HSplitContainer *tree_split = nullptr;
+	HSplitContainer *property_split = nullptr;
+	TabContainer *data_mode = nullptr;
+	Tree *scene_tree = nullptr;
+	Tree *mesh_tree = nullptr;
+	Tree *material_tree = nullptr;
 
-	EditorInspector *inspector;
+	EditorInspector *inspector = nullptr;
 
-	SubViewport *base_viewport;
+	SubViewport *base_viewport = nullptr;
 
-	Camera3D *camera;
+	Camera3D *camera = nullptr;
 	bool first_aabb = false;
 	AABB contents_aabb;
 
-	DirectionalLight3D *light;
+	DirectionalLight3D *light = nullptr;
 	Ref<ArrayMesh> selection_mesh;
-	MeshInstance3D *node_selected;
+	MeshInstance3D *node_selected = nullptr;
 
-	MeshInstance3D *mesh_preview;
+	MeshInstance3D *mesh_preview = nullptr;
 	Ref<SphereMesh> material_preview;
 
 	Ref<StandardMaterial3D> collider_mat;
@@ -95,9 +95,9 @@ class SceneImportSettings : public ConfirmationDialog {
 	struct MaterialData {
 		bool has_import_id;
 		Ref<Material> material;
-		TreeItem *scene_node;
-		TreeItem *mesh_node;
-		TreeItem *material_node;
+		TreeItem *scene_node = nullptr;
+		TreeItem *mesh_node = nullptr;
+		TreeItem *material_node = nullptr;
 
 		float cam_rot_x = -Math_PI / 4;
 		float cam_rot_y = -Math_PI / 4;
@@ -110,8 +110,8 @@ class SceneImportSettings : public ConfirmationDialog {
 	struct MeshData {
 		bool has_import_id;
 		Ref<Mesh> mesh;
-		TreeItem *scene_node;
-		TreeItem *mesh_node;
+		TreeItem *scene_node = nullptr;
+		TreeItem *mesh_node = nullptr;
 
 		float cam_rot_x = -Math_PI / 4;
 		float cam_rot_y = -Math_PI / 4;
@@ -122,14 +122,14 @@ class SceneImportSettings : public ConfirmationDialog {
 
 	struct AnimationData {
 		Ref<Animation> animation;
-		TreeItem *scene_node;
+		TreeItem *scene_node = nullptr;
 		Map<StringName, Variant> settings;
 	};
 	Map<String, AnimationData> animation_map;
 
 	struct NodeData {
-		Node *node;
-		TreeItem *scene_node;
+		Node *node = nullptr;
+		TreeItem *scene_node = nullptr;
 		Map<StringName, Variant> settings;
 	};
 	Map<String, NodeData> node_map;
@@ -158,20 +158,20 @@ class SceneImportSettings : public ConfirmationDialog {
 
 	Map<StringName, Variant> defaults;
 
-	SceneImportSettingsData *scene_import_settings_data;
+	SceneImportSettingsData *scene_import_settings_data = nullptr;
 
 	void _re_import();
 
 	String base_path;
 
-	MenuButton *action_menu;
+	MenuButton *action_menu = nullptr;
 
-	ConfirmationDialog *external_paths;
-	Tree *external_path_tree;
-	EditorFileDialog *save_path;
-	OptionButton *external_extension_type;
+	ConfirmationDialog *external_paths = nullptr;
+	Tree *external_path_tree = nullptr;
+	EditorFileDialog *save_path = nullptr;
+	OptionButton *external_extension_type = nullptr;
 
-	EditorFileDialog *item_save_path;
+	EditorFileDialog *item_save_path = nullptr;
 
 	void _menu_callback(int p_id);
 	void _save_dir_callback(const String &p_path);
diff --git a/editor/import_defaults_editor.h b/editor/import_defaults_editor.h
index ed94fe615631..f0433f6065e3 100644
--- a/editor/import_defaults_editor.h
+++ b/editor/import_defaults_editor.h
@@ -41,13 +41,13 @@ class EditorInspector;
 class ImportDefaultsEditor : public VBoxContainer {
 	GDCLASS(ImportDefaultsEditor, VBoxContainer)
 
-	OptionButton *importers;
-	Button *save_defaults;
-	Button *reset_defaults;
+	OptionButton *importers = nullptr;
+	Button *save_defaults = nullptr;
+	Button *reset_defaults = nullptr;
 
-	EditorInspector *inspector;
+	EditorInspector *inspector = nullptr;
 
-	ImportDefaultsEditorSettings *settings;
+	ImportDefaultsEditorSettings *settings = nullptr;
 
 	void _update_importer();
 	void _importer_selected(int p_index);
diff --git a/editor/import_dock.h b/editor/import_dock.h
index c5cdc4ac40f4..f522b0bced42 100644
--- a/editor/import_dock.h
+++ b/editor/import_dock.h
@@ -45,25 +45,25 @@ class ImportDockParameters;
 class ImportDock : public VBoxContainer {
 	GDCLASS(ImportDock, VBoxContainer);
 
-	Label *imported;
-	OptionButton *import_as;
-	MenuButton *preset;
-	EditorInspector *import_opts;
+	Label *imported = nullptr;
+	OptionButton *import_as = nullptr;
+	MenuButton *preset = nullptr;
+	EditorInspector *import_opts = nullptr;
 
 	List<PropertyInfo> properties;
 	Map<StringName, Variant> property_values;
 
-	ConfirmationDialog *reimport_confirm;
-	Label *label_warning;
-	Button *import;
+	ConfirmationDialog *reimport_confirm = nullptr;
+	Label *label_warning = nullptr;
+	Button *import = nullptr;
 
-	Control *advanced_spacer;
-	Button *advanced;
+	Control *advanced_spacer = nullptr;
+	Button *advanced = nullptr;
 
-	ImportDockParameters *params;
+	ImportDockParameters *params = nullptr;
 
-	VBoxContainer *content;
-	Label *select_a_resource;
+	VBoxContainer *content = nullptr;
+	Label *select_a_resource = nullptr;
 
 	void _preset_selected(int p_idx);
 	void _importer_selected(int i_idx);
diff --git a/editor/inspector_dock.h b/editor/inspector_dock.h
index 7e653c475092..86733c992da8 100644
--- a/editor/inspector_dock.h
+++ b/editor/inspector_dock.h
@@ -70,34 +70,34 @@ class InspectorDock : public VBoxContainer {
 		OBJECT_METHOD_BASE = 500
 	};
 
-	EditorData *editor_data;
+	EditorData *editor_data = nullptr;
 
-	EditorInspector *inspector;
+	EditorInspector *inspector = nullptr;
 
-	Object *current;
+	Object *current = nullptr;
 
-	Button *backward_button;
-	Button *forward_button;
+	Button *backward_button = nullptr;
+	Button *forward_button = nullptr;
 
-	EditorFileDialog *load_resource_dialog;
-	CreateDialog *new_resource_dialog;
-	Button *resource_new_button;
-	Button *resource_load_button;
-	MenuButton *resource_save_button;
-	MenuButton *resource_extra_button;
-	MenuButton *history_menu;
-	LineEdit *search;
+	EditorFileDialog *load_resource_dialog = nullptr;
+	CreateDialog *new_resource_dialog = nullptr;
+	Button *resource_new_button = nullptr;
+	Button *resource_load_button = nullptr;
+	MenuButton *resource_save_button = nullptr;
+	MenuButton *resource_extra_button = nullptr;
+	MenuButton *history_menu = nullptr;
+	LineEdit *search = nullptr;
 
-	Button *open_docs_button;
-	MenuButton *object_menu;
-	EditorPath *editor_path;
+	Button *open_docs_button = nullptr;
+	MenuButton *object_menu = nullptr;
+	EditorPath *editor_path = nullptr;
 
-	Button *warning;
-	AcceptDialog *warning_dialog;
+	Button *warning = nullptr;
+	AcceptDialog *warning_dialog = nullptr;
 
 	int current_option = -1;
-	ConfirmationDialog *unique_resources_confirmation;
-	Tree *unique_resources_list_tree;
+	ConfirmationDialog *unique_resources_confirmation = nullptr;
+	Tree *unique_resources_list_tree = nullptr;
 
 	EditorPropertyNameProcessor::Style property_name_style;
 
diff --git a/editor/localization_editor.h b/editor/localization_editor.h
index 3424ba7c552b..966ef0f36ed9 100644
--- a/editor/localization_editor.h
+++ b/editor/localization_editor.h
@@ -40,22 +40,22 @@ class EditorFileDialog;
 class LocalizationEditor : public VBoxContainer {
 	GDCLASS(LocalizationEditor, VBoxContainer);
 
-	Tree *translation_list;
+	Tree *translation_list = nullptr;
 
-	EditorLocaleDialog *locale_select;
-	EditorFileDialog *translation_file_open;
+	EditorLocaleDialog *locale_select = nullptr;
+	EditorFileDialog *translation_file_open = nullptr;
 
-	Button *translation_res_option_add_button;
-	EditorFileDialog *translation_res_file_open_dialog;
-	EditorFileDialog *translation_res_option_file_open_dialog;
-	Tree *translation_remap;
-	Tree *translation_remap_options;
+	Button *translation_res_option_add_button = nullptr;
+	EditorFileDialog *translation_res_file_open_dialog = nullptr;
+	EditorFileDialog *translation_res_option_file_open_dialog = nullptr;
+	Tree *translation_remap = nullptr;
+	Tree *translation_remap_options = nullptr;
 
-	Tree *translation_pot_list;
-	EditorFileDialog *pot_file_open_dialog;
-	EditorFileDialog *pot_generate_dialog;
+	Tree *translation_pot_list = nullptr;
+	EditorFileDialog *pot_file_open_dialog = nullptr;
+	EditorFileDialog *pot_generate_dialog = nullptr;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 	bool updating_translations = false;
 	String localization_changed;
 
diff --git a/editor/node_dock.h b/editor/node_dock.h
index 4c814ab65f80..35af1a8121b6 100644
--- a/editor/node_dock.h
+++ b/editor/node_dock.h
@@ -38,15 +38,15 @@ class ConnectionsDock;
 class NodeDock : public VBoxContainer {
 	GDCLASS(NodeDock, VBoxContainer);
 
-	Button *connections_button;
-	Button *groups_button;
+	Button *connections_button = nullptr;
+	Button *groups_button = nullptr;
 
-	ConnectionsDock *connections;
-	GroupsEditor *groups;
+	ConnectionsDock *connections = nullptr;
+	GroupsEditor *groups = nullptr;
 
-	HBoxContainer *mode_hb;
+	HBoxContainer *mode_hb = nullptr;
 
-	Label *select_a_node;
+	Label *select_a_node = nullptr;
 
 private:
 	static NodeDock *singleton;
diff --git a/editor/plugin_config_dialog.h b/editor/plugin_config_dialog.h
index 0dc2e84a98c9..76fec636f3ce 100644
--- a/editor/plugin_config_dialog.h
+++ b/editor/plugin_config_dialog.h
@@ -41,18 +41,18 @@
 class PluginConfigDialog : public ConfirmationDialog {
 	GDCLASS(PluginConfigDialog, ConfirmationDialog);
 
-	LineEdit *name_edit;
-	LineEdit *subfolder_edit;
-	TextEdit *desc_edit;
-	LineEdit *author_edit;
-	LineEdit *version_edit;
-	OptionButton *script_option_edit;
-	LineEdit *script_edit;
-	CheckBox *active_edit;
+	LineEdit *name_edit = nullptr;
+	LineEdit *subfolder_edit = nullptr;
+	TextEdit *desc_edit = nullptr;
+	LineEdit *author_edit = nullptr;
+	LineEdit *version_edit = nullptr;
+	OptionButton *script_option_edit = nullptr;
+	LineEdit *script_edit = nullptr;
+	CheckBox *active_edit = nullptr;
 
-	TextureRect *name_validation;
-	TextureRect *subfolder_validation;
-	TextureRect *script_validation;
+	TextureRect *name_validation = nullptr;
+	TextureRect *subfolder_validation = nullptr;
+	TextureRect *script_validation = nullptr;
 
 	bool _edit_mode;
 
diff --git a/editor/plugins/abstract_polygon_2d_editor.h b/editor/plugins/abstract_polygon_2d_editor.h
index c0e7c1be2e99..b0483cbb628e 100644
--- a/editor/plugins/abstract_polygon_2d_editor.h
+++ b/editor/plugins/abstract_polygon_2d_editor.h
@@ -40,9 +40,9 @@ class CanvasItemEditor;
 class AbstractPolygon2DEditor : public HBoxContainer {
 	GDCLASS(AbstractPolygon2DEditor, HBoxContainer);
 
-	Button *button_create;
-	Button *button_edit;
-	Button *button_delete;
+	Button *button_create = nullptr;
+	Button *button_edit = nullptr;
+	Button *button_delete = nullptr;
 
 	struct Vertex {
 		Vertex() {}
@@ -85,9 +85,9 @@ class AbstractPolygon2DEditor : public HBoxContainer {
 
 	bool _polygon_editing_enabled;
 
-	CanvasItemEditor *canvas_item_editor;
-	Panel *panel;
-	ConfirmationDialog *create_resource;
+	CanvasItemEditor *canvas_item_editor = nullptr;
+	Panel *panel = nullptr;
+	ConfirmationDialog *create_resource = nullptr;
 
 protected:
 	enum {
@@ -99,7 +99,7 @@ protected:
 
 	int mode;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	virtual void _menu_option(int p_option);
 	void _wip_changed();
@@ -149,7 +149,7 @@ public:
 class AbstractPolygon2DEditorPlugin : public EditorPlugin {
 	GDCLASS(AbstractPolygon2DEditorPlugin, EditorPlugin);
 
-	AbstractPolygon2DEditor *polygon_editor;
+	AbstractPolygon2DEditor *polygon_editor = nullptr;
 	String klass;
 
 public:
diff --git a/editor/plugins/animation_blend_space_1d_editor.h b/editor/plugins/animation_blend_space_1d_editor.h
index 54cded604836..816c2555ca21 100644
--- a/editor/plugins/animation_blend_space_1d_editor.h
+++ b/editor/plugins/animation_blend_space_1d_editor.h
@@ -45,36 +45,36 @@ class AnimationNodeBlendSpace1DEditor : public AnimationTreeNodeEditorPlugin {
 
 	Ref<AnimationNodeBlendSpace1D> blend_space;
 
-	HBoxContainer *goto_parent_hb;
-	Button *goto_parent;
+	HBoxContainer *goto_parent_hb = nullptr;
+	Button *goto_parent = nullptr;
 
-	PanelContainer *panel;
-	Button *tool_blend;
-	Button *tool_select;
-	Button *tool_create;
-	VSeparator *tool_erase_sep;
-	Button *tool_erase;
-	Button *snap;
-	SpinBox *snap_value;
+	PanelContainer *panel = nullptr;
+	Button *tool_blend = nullptr;
+	Button *tool_select = nullptr;
+	Button *tool_create = nullptr;
+	VSeparator *tool_erase_sep = nullptr;
+	Button *tool_erase = nullptr;
+	Button *snap = nullptr;
+	SpinBox *snap_value = nullptr;
 
-	LineEdit *label_value;
-	SpinBox *max_value;
-	SpinBox *min_value;
+	LineEdit *label_value = nullptr;
+	SpinBox *max_value = nullptr;
+	SpinBox *min_value = nullptr;
 
-	HBoxContainer *edit_hb;
-	SpinBox *edit_value;
-	Button *open_editor;
+	HBoxContainer *edit_hb = nullptr;
+	SpinBox *edit_value = nullptr;
+	Button *open_editor = nullptr;
 
 	int selected_point;
 
-	Control *blend_space_draw;
+	Control *blend_space_draw = nullptr;
 
-	PanelContainer *error_panel;
-	Label *error_label;
+	PanelContainer *error_panel = nullptr;
+	Label *error_label = nullptr;
 
 	bool updating;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	static AnimationNodeBlendSpace1DEditor *singleton;
 
@@ -87,8 +87,8 @@ class AnimationNodeBlendSpace1DEditor : public AnimationTreeNodeEditorPlugin {
 	void _labels_changed(String);
 	void _snap_toggled();
 
-	PopupMenu *menu;
-	PopupMenu *animations_menu;
+	PopupMenu *menu = nullptr;
+	PopupMenu *animations_menu = nullptr;
 	Vector<String> animations_to_add;
 	float add_point_pos;
 	Vector<real_t> points;
@@ -108,7 +108,7 @@ class AnimationNodeBlendSpace1DEditor : public AnimationTreeNodeEditorPlugin {
 	void _edit_point_pos(double);
 	void _open_editor();
 
-	EditorFileDialog *open_file;
+	EditorFileDialog *open_file = nullptr;
 	Ref<AnimationNode> file_loaded;
 	void _file_opened(const String &p_file);
 
diff --git a/editor/plugins/animation_blend_space_2d_editor.h b/editor/plugins/animation_blend_space_2d_editor.h
index 933d2bd96d24..db54e84254d9 100644
--- a/editor/plugins/animation_blend_space_2d_editor.h
+++ b/editor/plugins/animation_blend_space_2d_editor.h
@@ -45,43 +45,43 @@ class AnimationNodeBlendSpace2DEditor : public AnimationTreeNodeEditorPlugin {
 
 	Ref<AnimationNodeBlendSpace2D> blend_space;
 
-	PanelContainer *panel;
-	Button *tool_blend;
-	Button *tool_select;
-	Button *tool_create;
-	Button *tool_triangle;
-	VSeparator *tool_erase_sep;
-	Button *tool_erase;
-	Button *snap;
-	SpinBox *snap_x;
-	SpinBox *snap_y;
-	OptionButton *interpolation;
+	PanelContainer *panel = nullptr;
+	Button *tool_blend = nullptr;
+	Button *tool_select = nullptr;
+	Button *tool_create = nullptr;
+	Button *tool_triangle = nullptr;
+	VSeparator *tool_erase_sep = nullptr;
+	Button *tool_erase = nullptr;
+	Button *snap = nullptr;
+	SpinBox *snap_x = nullptr;
+	SpinBox *snap_y = nullptr;
+	OptionButton *interpolation = nullptr;
 
-	Button *auto_triangles;
+	Button *auto_triangles = nullptr;
 
-	LineEdit *label_x;
-	LineEdit *label_y;
-	SpinBox *max_x_value;
-	SpinBox *min_x_value;
-	SpinBox *max_y_value;
-	SpinBox *min_y_value;
+	LineEdit *label_x = nullptr;
+	LineEdit *label_y = nullptr;
+	SpinBox *max_x_value = nullptr;
+	SpinBox *min_x_value = nullptr;
+	SpinBox *max_y_value = nullptr;
+	SpinBox *min_y_value = nullptr;
 
-	HBoxContainer *edit_hb;
-	SpinBox *edit_x;
-	SpinBox *edit_y;
-	Button *open_editor;
+	HBoxContainer *edit_hb = nullptr;
+	SpinBox *edit_x = nullptr;
+	SpinBox *edit_y = nullptr;
+	Button *open_editor = nullptr;
 
 	int selected_point;
 	int selected_triangle;
 
-	Control *blend_space_draw;
+	Control *blend_space_draw = nullptr;
 
-	PanelContainer *error_panel;
-	Label *error_label;
+	PanelContainer *error_panel = nullptr;
+	Label *error_label = nullptr;
 
 	bool updating;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	static AnimationNodeBlendSpace2DEditor *singleton;
 
@@ -94,8 +94,8 @@ class AnimationNodeBlendSpace2DEditor : public AnimationTreeNodeEditorPlugin {
 	void _labels_changed(String);
 	void _snap_toggled();
 
-	PopupMenu *menu;
-	PopupMenu *animations_menu;
+	PopupMenu *menu = nullptr;
+	PopupMenu *animations_menu = nullptr;
 	Vector<String> animations_to_add;
 	Vector2 add_point_pos;
 	Vector<Vector2> points;
@@ -123,7 +123,7 @@ class AnimationNodeBlendSpace2DEditor : public AnimationTreeNodeEditorPlugin {
 
 	StringName get_blend_position_path() const;
 
-	EditorFileDialog *open_file;
+	EditorFileDialog *open_file = nullptr;
 	Ref<AnimationNode> file_loaded;
 	void _file_opened(const String &p_file);
 
diff --git a/editor/plugins/animation_blend_tree_editor_plugin.h b/editor/plugins/animation_blend_tree_editor_plugin.h
index c111f9245e00..cacf8379f9cf 100644
--- a/editor/plugins/animation_blend_tree_editor_plugin.h
+++ b/editor/plugins/animation_blend_tree_editor_plugin.h
@@ -47,19 +47,19 @@ class AnimationNodeBlendTreeEditor : public AnimationTreeNodeEditorPlugin {
 	GDCLASS(AnimationNodeBlendTreeEditor, AnimationTreeNodeEditorPlugin);
 
 	Ref<AnimationNodeBlendTree> blend_tree;
-	GraphEdit *graph;
-	MenuButton *add_node;
+	GraphEdit *graph = nullptr;
+	MenuButton *add_node = nullptr;
 	Vector2 position_from_popup_menu;
 	bool use_position_from_popup_menu;
 
-	PanelContainer *error_panel;
-	Label *error_label;
+	PanelContainer *error_panel = nullptr;
+	Label *error_label = nullptr;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
-	AcceptDialog *filter_dialog;
-	Tree *filters;
-	CheckBox *filter_enabled;
+	AcceptDialog *filter_dialog = nullptr;
+	Tree *filters = nullptr;
+	CheckBox *filter_enabled = nullptr;
 
 	Map<StringName, ProgressBar *> animations;
 	Vector<EditorProperty *> visible_properties;
@@ -122,7 +122,7 @@ class AnimationNodeBlendTreeEditor : public AnimationTreeNodeEditorPlugin {
 	void _update_editor_settings();
 	void _update_theme();
 
-	EditorFileDialog *open_file;
+	EditorFileDialog *open_file = nullptr;
 	Ref<AnimationNode> file_loaded;
 	void _file_opened(const String &p_file);
 
diff --git a/editor/plugins/animation_player_editor_plugin.h b/editor/plugins/animation_player_editor_plugin.h
index 5bb32e25e6e3..850751e47a1a 100644
--- a/editor/plugins/animation_player_editor_plugin.h
+++ b/editor/plugins/animation_player_editor_plugin.h
@@ -46,8 +46,8 @@ class AnimationPlayerEditorPlugin;
 class AnimationPlayerEditor : public VBoxContainer {
 	GDCLASS(AnimationPlayerEditor, VBoxContainer);
 
-	AnimationPlayerEditorPlugin *plugin;
-	AnimationPlayer *player;
+	AnimationPlayerEditorPlugin *plugin = nullptr;
+	AnimationPlayer *player = nullptr;
 
 	enum {
 		TOOL_NEW_ANIM,
@@ -88,31 +88,31 @@ class AnimationPlayerEditor : public VBoxContainer {
 		RESOURCE_SAVE
 	};
 
-	OptionButton *animation;
-	Button *stop;
-	Button *play;
-	Button *play_from;
-	Button *play_bw;
-	Button *play_bw_from;
-	Button *autoplay;
+	OptionButton *animation = nullptr;
+	Button *stop = nullptr;
+	Button *play = nullptr;
+	Button *play_from = nullptr;
+	Button *play_bw = nullptr;
+	Button *play_bw_from = nullptr;
+	Button *autoplay = nullptr;
 
-	MenuButton *tool_anim;
-	Button *onion_toggle;
-	MenuButton *onion_skinning;
-	Button *pin;
-	SpinBox *frame;
-	LineEdit *scale;
-	LineEdit *name;
-	Label *name_title;
-	UndoRedo *undo_redo;
+	MenuButton *tool_anim = nullptr;
+	Button *onion_toggle = nullptr;
+	MenuButton *onion_skinning = nullptr;
+	Button *pin = nullptr;
+	SpinBox *frame = nullptr;
+	LineEdit *scale = nullptr;
+	LineEdit *name = nullptr;
+	Label *name_title = nullptr;
+	UndoRedo *undo_redo = nullptr;
 	Ref<Texture2D> autoplay_icon;
 	Ref<Texture2D> reset_icon;
 	Ref<ImageTexture> autoplay_reset_icon;
 	bool last_active;
 	float timeline_position;
 
-	EditorFileDialog *file;
-	ConfirmationDialog *delete_dialog;
+	EditorFileDialog *file = nullptr;
+	ConfirmationDialog *delete_dialog = nullptr;
 
 	struct BlendEditor {
 		AcceptDialog *dialog = nullptr;
@@ -121,14 +121,14 @@ class AnimationPlayerEditor : public VBoxContainer {
 
 	} blend_editor;
 
-	ConfirmationDialog *name_dialog;
-	ConfirmationDialog *error_dialog;
+	ConfirmationDialog *name_dialog = nullptr;
+	ConfirmationDialog *error_dialog = nullptr;
 	int name_dialog_op = TOOL_NEW_ANIM;
 
 	bool updating;
 	bool updating_blends;
 
-	AnimationTrackEditor *track_editor;
+	AnimationTrackEditor *track_editor = nullptr;
 	static AnimationPlayerEditor *singleton;
 
 	// Onion skinning.
@@ -250,7 +250,7 @@ public:
 class AnimationPlayerEditorPlugin : public EditorPlugin {
 	GDCLASS(AnimationPlayerEditorPlugin, EditorPlugin);
 
-	AnimationPlayerEditor *anim_editor;
+	AnimationPlayerEditor *anim_editor = nullptr;
 
 protected:
 	void _notification(int p_what);
diff --git a/editor/plugins/animation_state_machine_editor.h b/editor/plugins/animation_state_machine_editor.h
index 03991d00f961..bf3f7e93cf5f 100644
--- a/editor/plugins/animation_state_machine_editor.h
+++ b/editor/plugins/animation_state_machine_editor.h
@@ -47,36 +47,36 @@ class AnimationNodeStateMachineEditor : public AnimationTreeNodeEditorPlugin {
 
 	Ref<AnimationNodeStateMachine> state_machine;
 
-	Button *tool_select;
-	Button *tool_create;
-	Button *tool_connect;
-	Popup *name_edit_popup;
-	LineEdit *name_edit;
+	Button *tool_select = nullptr;
+	Button *tool_create = nullptr;
+	Button *tool_connect = nullptr;
+	Popup *name_edit_popup = nullptr;
+	LineEdit *name_edit = nullptr;
 
-	HBoxContainer *tool_erase_hb;
-	Button *tool_erase;
-	Button *tool_autoplay;
-	Button *tool_end;
+	HBoxContainer *tool_erase_hb = nullptr;
+	Button *tool_erase = nullptr;
+	Button *tool_autoplay = nullptr;
+	Button *tool_end = nullptr;
 
-	OptionButton *transition_mode;
-	OptionButton *play_mode;
+	OptionButton *transition_mode = nullptr;
+	OptionButton *play_mode = nullptr;
 
-	PanelContainer *panel;
+	PanelContainer *panel = nullptr;
 
 	StringName selected_node;
 
-	HScrollBar *h_scroll;
-	VScrollBar *v_scroll;
+	HScrollBar *h_scroll = nullptr;
+	VScrollBar *v_scroll = nullptr;
 
-	Control *state_machine_draw;
-	Control *state_machine_play_pos;
+	Control *state_machine_draw = nullptr;
+	Control *state_machine_play_pos = nullptr;
 
-	PanelContainer *error_panel;
-	Label *error_label;
+	PanelContainer *error_panel = nullptr;
+	Label *error_label = nullptr;
 
 	bool updating;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	static AnimationNodeStateMachineEditor *singleton;
 
@@ -87,8 +87,8 @@ class AnimationNodeStateMachineEditor : public AnimationTreeNodeEditorPlugin {
 
 	void _update_graph();
 
-	PopupMenu *menu;
-	PopupMenu *animations_menu;
+	PopupMenu *menu = nullptr;
+	PopupMenu *animations_menu = nullptr;
 	Vector<String> animations_to_add;
 
 	Vector2 add_node_pos;
@@ -166,7 +166,7 @@ class AnimationNodeStateMachineEditor : public AnimationTreeNodeEditorPlugin {
 	float error_time;
 	String error_text;
 
-	EditorFileDialog *open_file;
+	EditorFileDialog *open_file = nullptr;
 	Ref<AnimationNode> file_loaded;
 	void _file_opened(const String &p_file);
 
diff --git a/editor/plugins/animation_tree_editor_plugin.h b/editor/plugins/animation_tree_editor_plugin.h
index 5442584a40fa..ab4ef5a00137 100644
--- a/editor/plugins/animation_tree_editor_plugin.h
+++ b/editor/plugins/animation_tree_editor_plugin.h
@@ -52,11 +52,11 @@ public:
 class AnimationTreeEditor : public VBoxContainer {
 	GDCLASS(AnimationTreeEditor, VBoxContainer);
 
-	ScrollContainer *path_edit;
-	HBoxContainer *path_hb;
+	ScrollContainer *path_edit = nullptr;
+	HBoxContainer *path_hb = nullptr;
 
-	AnimationTree *tree;
-	MarginContainer *editor_base;
+	AnimationTree *tree = nullptr;
+	MarginContainer *editor_base = nullptr;
 
 	Vector<String> button_path;
 	Vector<String> edited_path;
@@ -96,8 +96,8 @@ public:
 class AnimationTreeEditorPlugin : public EditorPlugin {
 	GDCLASS(AnimationTreeEditorPlugin, EditorPlugin);
 
-	AnimationTreeEditor *anim_tree_editor;
-	Button *button;
+	AnimationTreeEditor *anim_tree_editor = nullptr;
+	Button *button = nullptr;
 
 public:
 	virtual String get_name() const override { return "AnimationTree"; }
diff --git a/editor/plugins/asset_library_editor_plugin.h b/editor/plugins/asset_library_editor_plugin.h
index 493ffc4033ef..2a04935c4738 100644
--- a/editor/plugins/asset_library_editor_plugin.h
+++ b/editor/plugins/asset_library_editor_plugin.h
@@ -53,12 +53,12 @@
 class EditorAssetLibraryItem : public PanelContainer {
 	GDCLASS(EditorAssetLibraryItem, PanelContainer);
 
-	TextureButton *icon;
-	LinkButton *title;
-	LinkButton *category;
-	LinkButton *author;
+	TextureButton *icon = nullptr;
+	LinkButton *title = nullptr;
+	LinkButton *category = nullptr;
+	LinkButton *author = nullptr;
 	TextureRect *stars[5];
-	Label *price;
+	Label *price = nullptr;
 
 	int asset_id;
 	int category_id;
@@ -83,11 +83,11 @@ public:
 class EditorAssetLibraryItemDescription : public ConfirmationDialog {
 	GDCLASS(EditorAssetLibraryItemDescription, ConfirmationDialog);
 
-	EditorAssetLibraryItem *item;
-	RichTextLabel *description;
-	ScrollContainer *previews;
-	HBoxContainer *preview_hb;
-	PanelContainer *previews_bg;
+	EditorAssetLibraryItem *item = nullptr;
+	RichTextLabel *description = nullptr;
+	ScrollContainer *previews = nullptr;
+	HBoxContainer *preview_hb = nullptr;
+	PanelContainer *previews_bg = nullptr;
 
 	struct Preview {
 		int id = 0;
@@ -98,7 +98,7 @@ class EditorAssetLibraryItemDescription : public ConfirmationDialog {
 	};
 
 	Vector<Preview> preview_images;
-	TextureRect *preview;
+	TextureRect *preview = nullptr;
 
 	void set_image(int p_type, int p_index, const Ref<Texture2D> &p_image);
 
@@ -130,19 +130,19 @@ public:
 class EditorAssetLibraryItemDownload : public MarginContainer {
 	GDCLASS(EditorAssetLibraryItemDownload, MarginContainer);
 
-	PanelContainer *panel;
-	TextureRect *icon;
-	Label *title;
-	ProgressBar *progress;
-	Button *install_button;
-	Button *retry_button;
-	TextureButton *dismiss_button;
+	PanelContainer *panel = nullptr;
+	TextureRect *icon = nullptr;
+	Label *title = nullptr;
+	ProgressBar *progress = nullptr;
+	Button *install_button = nullptr;
+	Button *retry_button = nullptr;
+	TextureButton *dismiss_button = nullptr;
 
-	AcceptDialog *download_error;
-	HTTPRequest *download;
+	AcceptDialog *download_error = nullptr;
+	HTTPRequest *download = nullptr;
 	String host;
 	String sha256;
-	Label *status;
+	Label *status = nullptr;
 
 	int prev_status;
 
@@ -150,7 +150,7 @@ class EditorAssetLibraryItemDownload : public MarginContainer {
 
 	bool external_install;
 
-	EditorAssetInstaller *asset_installer;
+	EditorAssetInstaller *asset_installer = nullptr;
 
 	void _close();
 	void _make_request();
@@ -176,35 +176,35 @@ class EditorAssetLibrary : public PanelContainer {
 
 	String host;
 
-	EditorFileDialog *asset_open;
-	EditorAssetInstaller *asset_installer;
+	EditorFileDialog *asset_open = nullptr;
+	EditorAssetInstaller *asset_installer = nullptr;
 
 	void _asset_open();
 	void _asset_file_selected(const String &p_file);
 	void _update_repository_options();
 
-	PanelContainer *library_scroll_bg;
-	ScrollContainer *library_scroll;
-	VBoxContainer *library_vb;
-	Label *library_loading;
-	Label *library_error;
-	LineEdit *filter;
-	Timer *filter_debounce_timer;
-	OptionButton *categories;
-	OptionButton *repository;
-	OptionButton *sort;
-	HBoxContainer *error_hb;
-	TextureRect *error_tr;
-	Label *error_label;
-	MenuButton *support;
+	PanelContainer *library_scroll_bg = nullptr;
+	ScrollContainer *library_scroll = nullptr;
+	VBoxContainer *library_vb = nullptr;
+	Label *library_loading = nullptr;
+	Label *library_error = nullptr;
+	LineEdit *filter = nullptr;
+	Timer *filter_debounce_timer = nullptr;
+	OptionButton *categories = nullptr;
+	OptionButton *repository = nullptr;
+	OptionButton *sort = nullptr;
+	HBoxContainer *error_hb = nullptr;
+	TextureRect *error_tr = nullptr;
+	Label *error_label = nullptr;
+	MenuButton *support = nullptr;
 
-	HBoxContainer *contents;
+	HBoxContainer *contents = nullptr;
 
-	HBoxContainer *asset_top_page;
-	GridContainer *asset_items;
-	HBoxContainer *asset_bottom_page;
+	HBoxContainer *asset_top_page = nullptr;
+	GridContainer *asset_items = nullptr;
+	HBoxContainer *asset_bottom_page = nullptr;
 
-	HTTPRequest *request;
+	HTTPRequest *request = nullptr;
 
 	bool templates_only;
 	bool initial_loading;
@@ -260,7 +260,7 @@ class EditorAssetLibrary : public PanelContainer {
 	HBoxContainer *_make_pages(int p_page, int p_page_count, int p_page_len, int p_total_items, int p_current_items);
 
 	//
-	EditorAssetLibraryItemDescription *description;
+	EditorAssetLibraryItemDescription *description = nullptr;
 	//
 
 	enum RequestType {
@@ -273,8 +273,8 @@ class EditorAssetLibrary : public PanelContainer {
 	RequestType requesting;
 	Dictionary category_map;
 
-	ScrollContainer *downloads_scroll;
-	HBoxContainer *downloads_hb;
+	ScrollContainer *downloads_scroll = nullptr;
+	HBoxContainer *downloads_hb = nullptr;
 
 	void _install_asset();
 
@@ -315,7 +315,7 @@ public:
 class AssetLibraryEditorPlugin : public EditorPlugin {
 	GDCLASS(AssetLibraryEditorPlugin, EditorPlugin);
 
-	EditorAssetLibrary *addon_library;
+	EditorAssetLibrary *addon_library = nullptr;
 
 public:
 	virtual String get_name() const override { return "AssetLib"; }
diff --git a/editor/plugins/audio_stream_editor_plugin.h b/editor/plugins/audio_stream_editor_plugin.h
index 2478210430d2..0d927bddd501 100644
--- a/editor/plugins/audio_stream_editor_plugin.h
+++ b/editor/plugins/audio_stream_editor_plugin.h
@@ -75,7 +75,7 @@ public:
 class AudioStreamEditorPlugin : public EditorPlugin {
 	GDCLASS(AudioStreamEditorPlugin, EditorPlugin);
 
-	AudioStreamEditor *audio_editor;
+	AudioStreamEditor *audio_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "Audio"; }
diff --git a/editor/plugins/camera_3d_editor_plugin.h b/editor/plugins/camera_3d_editor_plugin.h
index c1f71d3b1bfa..a8164f9b85dd 100644
--- a/editor/plugins/camera_3d_editor_plugin.h
+++ b/editor/plugins/camera_3d_editor_plugin.h
@@ -37,9 +37,9 @@
 class Camera3DEditor : public Control {
 	GDCLASS(Camera3DEditor, Control);
 
-	Panel *panel;
-	Button *preview;
-	Node *node;
+	Panel *panel = nullptr;
+	Button *preview = nullptr;
+	Node *node = nullptr;
 
 	void _pressed();
 
diff --git a/editor/plugins/canvas_item_editor_plugin.h b/editor/plugins/canvas_item_editor_plugin.h
index 1a9d49a4a87f..1b61cdc67524 100644
--- a/editor/plugins/canvas_item_editor_plugin.h
+++ b/editor/plugins/canvas_item_editor_plugin.h
@@ -183,16 +183,16 @@ private:
 	bool selection_menu_additive_selection;
 
 	Tool tool = TOOL_SELECT;
-	Control *viewport;
-	Control *viewport_scrollable;
+	Control *viewport = nullptr;
+	Control *viewport_scrollable = nullptr;
 
-	HScrollBar *h_scroll;
-	VScrollBar *v_scroll;
-	HBoxContainer *hb;
+	HScrollBar *h_scroll = nullptr;
+	VScrollBar *v_scroll = nullptr;
+	HBoxContainer *hb = nullptr;
 	// Used for secondary menu items which are displayed depending on the currently selected node
 	// (such as MeshInstance's "Mesh" menu).
-	PanelContainer *context_menu_container;
-	HBoxContainer *hbc_context_menu;
+	PanelContainer *context_menu_container = nullptr;
+	HBoxContainer *hbc_context_menu = nullptr;
 
 	Transform2D transform;
 	GridVisibility grid_visibility = GRID_VISIBILITY_SHOW_WHEN_SNAPPING;
@@ -293,47 +293,47 @@ private:
 	};
 	List<PoseClipboard> pose_clipboard;
 
-	Button *select_button;
+	Button *select_button = nullptr;
 
-	Button *move_button;
-	Button *scale_button;
-	Button *rotate_button;
+	Button *move_button = nullptr;
+	Button *scale_button = nullptr;
+	Button *rotate_button = nullptr;
 
-	Button *list_select_button;
-	Button *pivot_button;
-	Button *pan_button;
+	Button *list_select_button = nullptr;
+	Button *pivot_button = nullptr;
+	Button *pan_button = nullptr;
 
-	Button *ruler_button;
+	Button *ruler_button = nullptr;
 
-	Button *smart_snap_button;
-	Button *grid_snap_button;
-	MenuButton *snap_config_menu;
-	PopupMenu *smartsnap_config_popup;
+	Button *smart_snap_button = nullptr;
+	Button *grid_snap_button = nullptr;
+	MenuButton *snap_config_menu = nullptr;
+	PopupMenu *smartsnap_config_popup = nullptr;
 
-	Button *lock_button;
-	Button *unlock_button;
+	Button *lock_button = nullptr;
+	Button *unlock_button = nullptr;
 
-	Button *group_button;
-	Button *ungroup_button;
+	Button *group_button = nullptr;
+	Button *ungroup_button = nullptr;
 
-	MenuButton *skeleton_menu;
-	Button *override_camera_button;
-	MenuButton *view_menu;
-	PopupMenu *grid_menu;
-	HBoxContainer *animation_hb;
-	MenuButton *animation_menu;
+	MenuButton *skeleton_menu = nullptr;
+	Button *override_camera_button = nullptr;
+	MenuButton *view_menu = nullptr;
+	PopupMenu *grid_menu = nullptr;
+	HBoxContainer *animation_hb = nullptr;
+	MenuButton *animation_menu = nullptr;
 
-	Button *key_loc_button;
-	Button *key_rot_button;
-	Button *key_scale_button;
-	Button *key_insert_button;
-	Button *key_auto_insert_button;
+	Button *key_loc_button = nullptr;
+	Button *key_rot_button = nullptr;
+	Button *key_scale_button = nullptr;
+	Button *key_insert_button = nullptr;
+	Button *key_auto_insert_button = nullptr;
 
-	PopupMenu *selection_menu;
-	PopupMenu *add_node_menu;
+	PopupMenu *selection_menu = nullptr;
+	PopupMenu *add_node_menu = nullptr;
 
-	Control *top_ruler;
-	Control *left_ruler;
+	Control *top_ruler = nullptr;
+	Control *left_ruler = nullptr;
 
 	Point2 drag_start_origin;
 	DragType drag_type = DRAG_NONE;
@@ -374,9 +374,9 @@ private:
 	void _find_canvas_items_in_rect(const Rect2 &p_rect, Node *p_node, List<CanvasItem *> *r_items, const Transform2D &p_parent_xform = Transform2D(), const Transform2D &p_canvas_xform = Transform2D());
 	bool _select_click_on_item(CanvasItem *item, Point2 p_click_pos, bool p_append);
 
-	ConfirmationDialog *snap_dialog;
+	ConfirmationDialog *snap_dialog = nullptr;
 
-	CanvasItem *ref_item;
+	CanvasItem *ref_item = nullptr;
 
 	void _save_canvas_item_state(List<CanvasItem *> p_canvas_items, bool save_bones = false);
 	void _restore_canvas_item_state(List<CanvasItem *> p_canvas_items, bool restore_bones = false);
@@ -400,7 +400,7 @@ private:
 	void _prepare_grid_menu();
 	void _on_grid_menu_id_pressed(int p_id);
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	List<CanvasItem *> _get_edited_canvas_items(bool retrieve_locked = false, bool remove_canvas_item_if_parent_in_selection = true);
 	Rect2 _get_encompassing_rect_from_list(List<CanvasItem *> p_list);
@@ -476,8 +476,8 @@ private:
 			const SnapTarget p_snap_target, List<const CanvasItem *> p_exceptions,
 			const Node *p_current);
 
-	VBoxContainer *controls_vb;
-	EditorZoomWidget *zoom_widget;
+	VBoxContainer *controls_vb = nullptr;
+	EditorZoomWidget *zoom_widget = nullptr;
 	void _update_zoom(real_t p_zoom);
 	void _shortcut_zoom_set(real_t p_zoom);
 	void _zoom_on_position(real_t p_zoom, Point2 p_position = Point2());
@@ -488,9 +488,9 @@ private:
 
 	void _update_override_camera_button(bool p_game_running);
 
-	HSplitContainer *left_panel_split;
-	HSplitContainer *right_panel_split;
-	VSplitContainer *bottom_split;
+	HSplitContainer *left_panel_split = nullptr;
+	HSplitContainer *right_panel_split = nullptr;
+	VSplitContainer *bottom_split = nullptr;
 
 	void _update_context_menu_stylebox();
 
@@ -555,7 +555,7 @@ public:
 
 	void focus_selection();
 
-	EditorSelection *editor_selection;
+	EditorSelection *editor_selection = nullptr;
 
 	CanvasItemEditor();
 };
@@ -563,7 +563,7 @@ public:
 class CanvasItemEditorPlugin : public EditorPlugin {
 	GDCLASS(CanvasItemEditorPlugin, EditorPlugin);
 
-	CanvasItemEditor *canvas_item_editor;
+	CanvasItemEditor *canvas_item_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "2D"; }
@@ -589,18 +589,18 @@ class CanvasItemEditorViewport : public Control {
 	Vector<String> texture_node_types;
 
 	Vector<String> selected_files;
-	Node *target_node;
+	Node *target_node = nullptr;
 	Point2 drop_pos;
 
-	EditorData *editor_data;
-	CanvasItemEditor *canvas_item_editor;
-	Control *preview_node;
-	AcceptDialog *accept;
-	AcceptDialog *selector;
-	Label *selector_label;
-	Label *label;
-	Label *label_desc;
-	VBoxContainer *btn_group;
+	EditorData *editor_data = nullptr;
+	CanvasItemEditor *canvas_item_editor = nullptr;
+	Control *preview_node = nullptr;
+	AcceptDialog *accept = nullptr;
+	AcceptDialog *selector = nullptr;
+	Label *selector_label = nullptr;
+	Label *label = nullptr;
+	Label *label_desc = nullptr;
+	VBoxContainer *btn_group = nullptr;
 	Ref<ButtonGroup> button_group;
 
 	void _on_mouse_exit();
diff --git a/editor/plugins/collision_polygon_2d_editor_plugin.h b/editor/plugins/collision_polygon_2d_editor_plugin.h
index bdd4228b3b89..0225d5d6204a 100644
--- a/editor/plugins/collision_polygon_2d_editor_plugin.h
+++ b/editor/plugins/collision_polygon_2d_editor_plugin.h
@@ -37,7 +37,7 @@
 class CollisionPolygon2DEditor : public AbstractPolygon2DEditor {
 	GDCLASS(CollisionPolygon2DEditor, AbstractPolygon2DEditor);
 
-	CollisionPolygon2D *node;
+	CollisionPolygon2D *node = nullptr;
 
 protected:
 	virtual Node2D *_get_node() const override;
diff --git a/editor/plugins/collision_shape_2d_editor_plugin.h b/editor/plugins/collision_shape_2d_editor_plugin.h
index 033ea3db93c7..da9e9f339fd0 100644
--- a/editor/plugins/collision_shape_2d_editor_plugin.h
+++ b/editor/plugins/collision_shape_2d_editor_plugin.h
@@ -61,9 +61,9 @@ class CollisionShape2DEditor : public Control {
 		Point2(1, -1),
 	};
 
-	UndoRedo *undo_redo;
-	CanvasItemEditor *canvas_item_editor;
-	CollisionShape2D *node;
+	UndoRedo *undo_redo = nullptr;
+	CanvasItemEditor *canvas_item_editor = nullptr;
+	CollisionShape2D *node = nullptr;
 
 	Vector<Point2> handles;
 
@@ -96,7 +96,7 @@ public:
 class CollisionShape2DEditorPlugin : public EditorPlugin {
 	GDCLASS(CollisionShape2DEditorPlugin, EditorPlugin);
 
-	CollisionShape2DEditor *collision_shape_2d_editor;
+	CollisionShape2DEditor *collision_shape_2d_editor = nullptr;
 
 public:
 	virtual bool forward_canvas_gui_input(const Ref<InputEvent> &p_event) override { return collision_shape_2d_editor->forward_canvas_gui_input(p_event); }
diff --git a/editor/plugins/control_editor_plugin.h b/editor/plugins/control_editor_plugin.h
index 37d218abb9dc..96451f7dcf79 100644
--- a/editor/plugins/control_editor_plugin.h
+++ b/editor/plugins/control_editor_plugin.h
@@ -70,7 +70,7 @@ public:
 
 class EditorPropertyAnchorsPreset : public EditorProperty {
 	GDCLASS(EditorPropertyAnchorsPreset, EditorProperty);
-	OptionButton *options;
+	OptionButton *options = nullptr;
 
 	void _option_selected(int p_which);
 
@@ -94,9 +94,9 @@ class EditorPropertySizeFlags : public EditorProperty {
 		SIZE_FLAGS_PRESET_CUSTOM,
 	};
 
-	OptionButton *flag_presets;
-	CheckBox *flag_expand;
-	VBoxContainer *flag_options;
+	OptionButton *flag_presets = nullptr;
+	CheckBox *flag_expand = nullptr;
+	VBoxContainer *flag_options = nullptr;
 	Vector<CheckBox *> flag_checks;
 
 	bool vertical = false;
@@ -128,8 +128,8 @@ public:
 class ControlEditorToolbar : public HBoxContainer {
 	GDCLASS(ControlEditorToolbar, HBoxContainer);
 
-	UndoRedo *undo_redo;
-	EditorSelection *editor_selection;
+	UndoRedo *undo_redo = nullptr;
+	EditorSelection *editor_selection = nullptr;
 
 	enum MenuOption {
 		ANCHORS_AND_OFFSETS_PRESET_TOP_LEFT,
@@ -198,12 +198,12 @@ class ControlEditorToolbar : public HBoxContainer {
 		CONTAINERS_V_PRESET_SHRINK_END,
 	};
 
-	MenuButton *anchor_presets_menu;
-	PopupMenu *anchors_popup;
-	MenuButton *container_h_presets_menu;
-	MenuButton *container_v_presets_menu;
+	MenuButton *anchor_presets_menu = nullptr;
+	PopupMenu *anchors_popup = nullptr;
+	MenuButton *container_h_presets_menu = nullptr;
+	MenuButton *container_v_presets_menu = nullptr;
 
-	Button *anchor_mode_button;
+	Button *anchor_mode_button = nullptr;
 
 	bool anchors_mode = false;
 
@@ -239,7 +239,7 @@ public:
 class ControlEditorPlugin : public EditorPlugin {
 	GDCLASS(ControlEditorPlugin, EditorPlugin);
 
-	ControlEditorToolbar *toolbar;
+	ControlEditorToolbar *toolbar = nullptr;
 
 public:
 	virtual String get_name() const override { return "Control"; }
diff --git a/editor/plugins/cpu_particles_2d_editor_plugin.h b/editor/plugins/cpu_particles_2d_editor_plugin.h
index b10ed73e3803..cc59bc924fa3 100644
--- a/editor/plugins/cpu_particles_2d_editor_plugin.h
+++ b/editor/plugins/cpu_particles_2d_editor_plugin.h
@@ -55,22 +55,22 @@ class CPUParticles2DEditorPlugin : public EditorPlugin {
 		EMISSION_MODE_BORDER_DIRECTED
 	};
 
-	CPUParticles2D *particles;
+	CPUParticles2D *particles = nullptr;
 
-	EditorFileDialog *file;
+	EditorFileDialog *file = nullptr;
 
-	HBoxContainer *toolbar;
-	MenuButton *menu;
+	HBoxContainer *toolbar = nullptr;
+	MenuButton *menu = nullptr;
 
-	SpinBox *epoints;
+	SpinBox *epoints = nullptr;
 
-	ConfirmationDialog *emission_mask;
-	OptionButton *emission_mask_mode;
-	CheckBox *emission_colors;
+	ConfirmationDialog *emission_mask = nullptr;
+	OptionButton *emission_mask_mode = nullptr;
+	CheckBox *emission_colors = nullptr;
 
 	String source_emission_file;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 	void _file_selected(const String &p_file);
 	void _menu_callback(int p_idx);
 	void _generate_emission_mask();
diff --git a/editor/plugins/cpu_particles_3d_editor_plugin.h b/editor/plugins/cpu_particles_3d_editor_plugin.h
index 05019365749b..70f2da4b2d4f 100644
--- a/editor/plugins/cpu_particles_3d_editor_plugin.h
+++ b/editor/plugins/cpu_particles_3d_editor_plugin.h
@@ -44,7 +44,7 @@ class CPUParticles3DEditor : public GPUParticles3DEditorBase {
 
 	};
 
-	CPUParticles3D *node;
+	CPUParticles3D *node = nullptr;
 
 	void _menu_option(int);
 
@@ -65,7 +65,7 @@ public:
 class CPUParticles3DEditorPlugin : public EditorPlugin {
 	GDCLASS(CPUParticles3DEditorPlugin, EditorPlugin);
 
-	CPUParticles3DEditor *particles_editor;
+	CPUParticles3DEditor *particles_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "CPUParticles3D"; }
diff --git a/editor/plugins/curve_editor_plugin.h b/editor/plugins/curve_editor_plugin.h
index 4aba2fffd08a..5cf3b16a0629 100644
--- a/editor/plugins/curve_editor_plugin.h
+++ b/editor/plugins/curve_editor_plugin.h
@@ -99,8 +99,8 @@ private:
 	Transform2D _world_to_view;
 
 	Ref<Curve> _curve_ref;
-	PopupMenu *_context_menu;
-	PopupMenu *_presets_menu;
+	PopupMenu *_context_menu = nullptr;
+	PopupMenu *_presets_menu = nullptr;
 
 	Array _undo_data;
 	bool _has_undo_data;
diff --git a/editor/plugins/debugger_editor_plugin.h b/editor/plugins/debugger_editor_plugin.h
index c02452628547..10e1a2793352 100644
--- a/editor/plugins/debugger_editor_plugin.h
+++ b/editor/plugins/debugger_editor_plugin.h
@@ -41,9 +41,9 @@ class DebuggerEditorPlugin : public EditorPlugin {
 	GDCLASS(DebuggerEditorPlugin, EditorPlugin);
 
 private:
-	MenuButton *debug_menu;
-	EditorFileServer *file_server;
-	PopupMenu *instances_menu;
+	MenuButton *debug_menu = nullptr;
+	EditorFileServer *file_server = nullptr;
+	PopupMenu *instances_menu = nullptr;
 
 	enum MenuOptions {
 		RUN_FILE_SERVER,
diff --git a/editor/plugins/gpu_particles_2d_editor_plugin.h b/editor/plugins/gpu_particles_2d_editor_plugin.h
index f94ce632e984..75f68617d14d 100644
--- a/editor/plugins/gpu_particles_2d_editor_plugin.h
+++ b/editor/plugins/gpu_particles_2d_editor_plugin.h
@@ -56,26 +56,26 @@ class GPUParticles2DEditorPlugin : public EditorPlugin {
 		EMISSION_MODE_BORDER_DIRECTED
 	};
 
-	GPUParticles2D *particles;
+	GPUParticles2D *particles = nullptr;
 	List<GPUParticles2D *> selected_particles;
 
-	EditorFileDialog *file;
+	EditorFileDialog *file = nullptr;
 
-	HBoxContainer *toolbar;
-	MenuButton *menu;
+	HBoxContainer *toolbar = nullptr;
+	MenuButton *menu = nullptr;
 
-	SpinBox *epoints;
+	SpinBox *epoints = nullptr;
 
-	ConfirmationDialog *generate_visibility_rect;
-	SpinBox *generate_seconds;
+	ConfirmationDialog *generate_visibility_rect = nullptr;
+	SpinBox *generate_seconds = nullptr;
 
-	ConfirmationDialog *emission_mask;
-	OptionButton *emission_mask_mode;
-	CheckBox *emission_colors;
+	ConfirmationDialog *emission_mask = nullptr;
+	OptionButton *emission_mask_mode = nullptr;
+	CheckBox *emission_colors = nullptr;
 
 	String source_emission_file;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 	void _file_selected(const String &p_file);
 	void _menu_callback(int p_idx);
 	void _generate_visibility_rect();
diff --git a/editor/plugins/gpu_particles_3d_editor_plugin.h b/editor/plugins/gpu_particles_3d_editor_plugin.h
index 39aa596ece35..190fb9954bf0 100644
--- a/editor/plugins/gpu_particles_3d_editor_plugin.h
+++ b/editor/plugins/gpu_particles_3d_editor_plugin.h
@@ -41,16 +41,16 @@ class GPUParticles3DEditorBase : public Control {
 	GDCLASS(GPUParticles3DEditorBase, Control);
 
 protected:
-	Node3D *base_node;
-	Panel *panel;
-	MenuButton *options;
-	HBoxContainer *particles_editor_hb;
+	Node3D *base_node = nullptr;
+	Panel *panel = nullptr;
+	MenuButton *options = nullptr;
+	HBoxContainer *particles_editor_hb = nullptr;
 
-	SceneTreeDialog *emission_tree_dialog;
+	SceneTreeDialog *emission_tree_dialog = nullptr;
 
-	ConfirmationDialog *emission_dialog;
-	SpinBox *emission_amount;
-	OptionButton *emission_fill;
+	ConfirmationDialog *emission_dialog = nullptr;
+	SpinBox *emission_amount = nullptr;
+	OptionButton *emission_fill = nullptr;
 
 	Vector<Face3> geometry;
 
@@ -67,9 +67,9 @@ public:
 class GPUParticles3DEditor : public GPUParticles3DEditorBase {
 	GDCLASS(GPUParticles3DEditor, GPUParticles3DEditorBase);
 
-	ConfirmationDialog *generate_aabb;
-	SpinBox *generate_seconds;
-	GPUParticles3D *node;
+	ConfirmationDialog *generate_aabb = nullptr;
+	SpinBox *generate_seconds = nullptr;
+	GPUParticles3D *node = nullptr;
 
 	enum Menu {
 		MENU_OPTION_GENERATE_AABB,
@@ -101,7 +101,7 @@ public:
 class GPUParticles3DEditorPlugin : public EditorPlugin {
 	GDCLASS(GPUParticles3DEditorPlugin, EditorPlugin);
 
-	GPUParticles3DEditor *particles_editor;
+	GPUParticles3DEditor *particles_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "GPUParticles3D"; }
diff --git a/editor/plugins/gpu_particles_collision_sdf_editor_plugin.h b/editor/plugins/gpu_particles_collision_sdf_editor_plugin.h
index f6e4fd3dec63..684279039a61 100644
--- a/editor/plugins/gpu_particles_collision_sdf_editor_plugin.h
+++ b/editor/plugins/gpu_particles_collision_sdf_editor_plugin.h
@@ -41,12 +41,12 @@ class EditorFileDialog;
 class GPUParticlesCollisionSDF3DEditorPlugin : public EditorPlugin {
 	GDCLASS(GPUParticlesCollisionSDF3DEditorPlugin, EditorPlugin);
 
-	GPUParticlesCollisionSDF3D *col_sdf;
+	GPUParticlesCollisionSDF3D *col_sdf = nullptr;
 
-	HBoxContainer *bake_hb;
-	Button *bake;
+	HBoxContainer *bake_hb = nullptr;
+	Button *bake = nullptr;
 
-	EditorFileDialog *probe_file;
+	EditorFileDialog *probe_file = nullptr;
 
 	static EditorProgress *tmp_progress;
 	static void bake_func_begin(int p_steps);
diff --git a/editor/plugins/gradient_editor_plugin.h b/editor/plugins/gradient_editor_plugin.h
index 9857ea018da8..26bf76fecd49 100644
--- a/editor/plugins/gradient_editor_plugin.h
+++ b/editor/plugins/gradient_editor_plugin.h
@@ -65,9 +65,9 @@ class GradientReverseButton : public BaseButton {
 class EditorInspectorPluginGradient : public EditorInspectorPlugin {
 	GDCLASS(EditorInspectorPluginGradient, EditorInspectorPlugin);
 
-	GradientEditor *editor;
-	HBoxContainer *gradient_tools_hbox;
-	GradientReverseButton *reverse_btn;
+	GradientEditor *editor = nullptr;
+	HBoxContainer *gradient_tools_hbox = nullptr;
+	GradientReverseButton *reverse_btn = nullptr;
 
 	void _reverse_button_pressed();
 
diff --git a/editor/plugins/input_event_editor_plugin.h b/editor/plugins/input_event_editor_plugin.h
index ab948462abad..3c658a86e955 100644
--- a/editor/plugins/input_event_editor_plugin.h
+++ b/editor/plugins/input_event_editor_plugin.h
@@ -38,11 +38,11 @@
 class InputEventConfigContainer : public HBoxContainer {
 	GDCLASS(InputEventConfigContainer, HBoxContainer);
 
-	Label *input_event_text;
-	Button *open_config_button;
+	Label *input_event_text = nullptr;
+	Button *open_config_button = nullptr;
 
 	Ref<InputEvent> input_event;
-	InputEventConfigurationDialog *config_dialog;
+	InputEventConfigurationDialog *config_dialog = nullptr;
 
 	void _config_dialog_confirmed();
 	void _configure_pressed();
diff --git a/editor/plugins/light_occluder_2d_editor_plugin.h b/editor/plugins/light_occluder_2d_editor_plugin.h
index 557e8bf292a7..aeee12b5b6a4 100644
--- a/editor/plugins/light_occluder_2d_editor_plugin.h
+++ b/editor/plugins/light_occluder_2d_editor_plugin.h
@@ -37,7 +37,7 @@
 class LightOccluder2DEditor : public AbstractPolygon2DEditor {
 	GDCLASS(LightOccluder2DEditor, AbstractPolygon2DEditor);
 
-	LightOccluder2D *node;
+	LightOccluder2D *node = nullptr;
 
 	Ref<OccluderPolygon2D> _ensure_occluder() const;
 
diff --git a/editor/plugins/lightmap_gi_editor_plugin.h b/editor/plugins/lightmap_gi_editor_plugin.h
index e65823018114..1202efe8fce1 100644
--- a/editor/plugins/lightmap_gi_editor_plugin.h
+++ b/editor/plugins/lightmap_gi_editor_plugin.h
@@ -41,11 +41,11 @@ class EditorFileDialog;
 class LightmapGIEditorPlugin : public EditorPlugin {
 	GDCLASS(LightmapGIEditorPlugin, EditorPlugin);
 
-	LightmapGI *lightmap;
+	LightmapGI *lightmap = nullptr;
 
-	Button *bake;
+	Button *bake = nullptr;
 
-	EditorFileDialog *file_dialog;
+	EditorFileDialog *file_dialog = nullptr;
 	static EditorProgress *tmp_progress;
 	static bool bake_func_step(float p_progress, const String &p_description, void *, bool p_refresh);
 	static void bake_func_end(uint64_t p_time_started);
diff --git a/editor/plugins/line_2d_editor_plugin.h b/editor/plugins/line_2d_editor_plugin.h
index 307cf1120756..0d407b315057 100644
--- a/editor/plugins/line_2d_editor_plugin.h
+++ b/editor/plugins/line_2d_editor_plugin.h
@@ -37,7 +37,7 @@
 class Line2DEditor : public AbstractPolygon2DEditor {
 	GDCLASS(Line2DEditor, AbstractPolygon2DEditor);
 
-	Line2D *node;
+	Line2D *node = nullptr;
 
 protected:
 	virtual Node2D *_get_node() const override;
diff --git a/editor/plugins/mesh_editor_plugin.h b/editor/plugins/mesh_editor_plugin.h
index 37464c98fecd..3554b3c1e98c 100644
--- a/editor/plugins/mesh_editor_plugin.h
+++ b/editor/plugins/mesh_editor_plugin.h
@@ -44,17 +44,17 @@ class MeshEditor : public SubViewportContainer {
 	float rot_x;
 	float rot_y;
 
-	SubViewport *viewport;
-	MeshInstance3D *mesh_instance;
-	Node3D *rotation;
-	DirectionalLight3D *light1;
-	DirectionalLight3D *light2;
-	Camera3D *camera;
+	SubViewport *viewport = nullptr;
+	MeshInstance3D *mesh_instance = nullptr;
+	Node3D *rotation = nullptr;
+	DirectionalLight3D *light1 = nullptr;
+	DirectionalLight3D *light2 = nullptr;
+	Camera3D *camera = nullptr;
 
 	Ref<Mesh> mesh;
 
-	TextureButton *light_1_switch;
-	TextureButton *light_2_switch;
+	TextureButton *light_1_switch = nullptr;
+	TextureButton *light_2_switch = nullptr;
 
 	void _button_pressed(Node *p_button);
 	bool first_enter;
diff --git a/editor/plugins/mesh_instance_3d_editor_plugin.h b/editor/plugins/mesh_instance_3d_editor_plugin.h
index 9c59c5fb9fb1..36d8eacd98d6 100644
--- a/editor/plugins/mesh_instance_3d_editor_plugin.h
+++ b/editor/plugins/mesh_instance_3d_editor_plugin.h
@@ -51,17 +51,17 @@ class MeshInstance3DEditor : public Control {
 		MENU_OPTION_DEBUG_UV2,
 	};
 
-	MeshInstance3D *node;
+	MeshInstance3D *node = nullptr;
 
-	MenuButton *options;
+	MenuButton *options = nullptr;
 
-	ConfirmationDialog *outline_dialog;
-	SpinBox *outline_size;
+	ConfirmationDialog *outline_dialog = nullptr;
+	SpinBox *outline_size = nullptr;
 
-	AcceptDialog *err_dialog;
+	AcceptDialog *err_dialog = nullptr;
 
-	AcceptDialog *debug_uv_dialog;
-	Control *debug_uv;
+	AcceptDialog *debug_uv_dialog = nullptr;
+	Control *debug_uv = nullptr;
 	Vector<Vector2> uv_lines;
 
 	void _menu_option(int p_option);
@@ -84,7 +84,7 @@ public:
 class MeshInstance3DEditorPlugin : public EditorPlugin {
 	GDCLASS(MeshInstance3DEditorPlugin, EditorPlugin);
 
-	MeshInstance3DEditor *mesh_editor;
+	MeshInstance3DEditor *mesh_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "MeshInstance3D"; }
diff --git a/editor/plugins/mesh_library_editor_plugin.h b/editor/plugins/mesh_library_editor_plugin.h
index 6bc992869b5f..85ead3553426 100644
--- a/editor/plugins/mesh_library_editor_plugin.h
+++ b/editor/plugins/mesh_library_editor_plugin.h
@@ -43,10 +43,10 @@ class MeshLibraryEditor : public Control {
 
 	Ref<MeshLibrary> mesh_library;
 
-	MenuButton *menu;
-	ConfirmationDialog *cd_remove;
-	ConfirmationDialog *cd_update;
-	EditorFileDialog *file;
+	MenuButton *menu = nullptr;
+	ConfirmationDialog *cd_remove = nullptr;
+	ConfirmationDialog *cd_update = nullptr;
+	EditorFileDialog *file = nullptr;
 	bool apply_xforms;
 	int to_erase;
 
@@ -81,7 +81,7 @@ public:
 class MeshLibraryEditorPlugin : public EditorPlugin {
 	GDCLASS(MeshLibraryEditorPlugin, EditorPlugin);
 
-	MeshLibraryEditor *mesh_library_editor;
+	MeshLibraryEditor *mesh_library_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "MeshLibrary"; }
diff --git a/editor/plugins/multimesh_editor_plugin.h b/editor/plugins/multimesh_editor_plugin.h
index 846e6d17f37f..9f5e85216c2d 100644
--- a/editor/plugins/multimesh_editor_plugin.h
+++ b/editor/plugins/multimesh_editor_plugin.h
@@ -43,26 +43,26 @@ class MultiMeshEditor : public Control {
 
 	friend class MultiMeshEditorPlugin;
 
-	AcceptDialog *err_dialog;
-	MenuButton *options;
-	MultiMeshInstance3D *_last_pp_node;
+	AcceptDialog *err_dialog = nullptr;
+	MenuButton *options = nullptr;
+	MultiMeshInstance3D *_last_pp_node = nullptr;
 	bool browsing_source;
 
-	Panel *panel;
-	MultiMeshInstance3D *node;
+	Panel *panel = nullptr;
+	MultiMeshInstance3D *node = nullptr;
 
-	LineEdit *surface_source;
-	LineEdit *mesh_source;
+	LineEdit *surface_source = nullptr;
+	LineEdit *mesh_source = nullptr;
 
-	SceneTreeDialog *std;
+	SceneTreeDialog *std = nullptr;
 
-	ConfirmationDialog *populate_dialog;
-	OptionButton *populate_axis;
-	HSlider *populate_rotate_random;
-	HSlider *populate_tilt_random;
-	SpinBox *populate_scale_random;
-	SpinBox *populate_scale;
-	SpinBox *populate_amount;
+	ConfirmationDialog *populate_dialog = nullptr;
+	OptionButton *populate_axis = nullptr;
+	HSlider *populate_rotate_random = nullptr;
+	HSlider *populate_tilt_random = nullptr;
+	SpinBox *populate_scale_random = nullptr;
+	SpinBox *populate_scale = nullptr;
+	SpinBox *populate_amount = nullptr;
 
 	enum Menu {
 		MENU_OPTION_POPULATE
@@ -85,7 +85,7 @@ public:
 class MultiMeshEditorPlugin : public EditorPlugin {
 	GDCLASS(MultiMeshEditorPlugin, EditorPlugin);
 
-	MultiMeshEditor *multimesh_editor;
+	MultiMeshEditor *multimesh_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "MultiMesh"; }
diff --git a/editor/plugins/navigation_polygon_editor_plugin.h b/editor/plugins/navigation_polygon_editor_plugin.h
index 16fbb241e9b4..7550b75fa386 100644
--- a/editor/plugins/navigation_polygon_editor_plugin.h
+++ b/editor/plugins/navigation_polygon_editor_plugin.h
@@ -37,7 +37,7 @@
 class NavigationPolygonEditor : public AbstractPolygon2DEditor {
 	GDCLASS(NavigationPolygonEditor, AbstractPolygon2DEditor);
 
-	NavigationRegion2D *node;
+	NavigationRegion2D *node = nullptr;
 
 	Ref<NavigationPolygon> _ensure_navpoly() const;
 
diff --git a/editor/plugins/node_3d_editor_gizmos.h b/editor/plugins/node_3d_editor_gizmos.h
index fa55651d2642..3b67b898e33c 100644
--- a/editor/plugins/node_3d_editor_gizmos.h
+++ b/editor/plugins/node_3d_editor_gizmos.h
@@ -70,14 +70,14 @@ class EditorNode3DGizmo : public Node3DGizmo {
 	bool valid;
 	bool hidden;
 	Vector<Instance> instances;
-	Node3D *spatial_node;
+	Node3D *spatial_node = nullptr;
 
 	void _set_spatial_node(Node *p_node) { set_spatial_node(Object::cast_to<Node3D>(p_node)); }
 
 protected:
 	static void _bind_methods();
 
-	EditorNode3DGizmoPlugin *gizmo_plugin;
+	EditorNode3DGizmoPlugin *gizmo_plugin = nullptr;
 
 	GDVIRTUAL0(_redraw)
 	GDVIRTUAL2RC(String, _get_handle_name, int, bool)
@@ -618,7 +618,7 @@ public:
 class Joint3DGizmoPlugin : public EditorNode3DGizmoPlugin {
 	GDCLASS(Joint3DGizmoPlugin, EditorNode3DGizmoPlugin);
 
-	Timer *update_timer;
+	Timer *update_timer = nullptr;
 	uint64_t update_idx = 0;
 
 	void incremental_update_gizmos();
diff --git a/editor/plugins/node_3d_editor_plugin.h b/editor/plugins/node_3d_editor_plugin.h
index 5c0bfab34e2b..5447befeddb5 100644
--- a/editor/plugins/node_3d_editor_plugin.h
+++ b/editor/plugins/node_3d_editor_plugin.h
@@ -190,27 +190,27 @@ private:
 	ViewType view_type;
 	void _menu_option(int p_option);
 	void _set_auto_orthogonal();
-	Node3D *preview_node;
-	AABB *preview_bounds;
+	Node3D *preview_node = nullptr;
+	AABB *preview_bounds = nullptr;
 	Vector<String> selected_files;
-	AcceptDialog *accept;
+	AcceptDialog *accept = nullptr;
 
-	Node *target_node;
+	Node *target_node = nullptr;
 	Point2 drop_pos;
 
-	EditorData *editor_data;
-	EditorSelection *editor_selection;
-	UndoRedo *undo_redo;
+	EditorData *editor_data = nullptr;
+	EditorSelection *editor_selection = nullptr;
+	UndoRedo *undo_redo = nullptr;
 
-	CheckBox *preview_camera;
-	SubViewportContainer *subviewport_container;
+	CheckBox *preview_camera = nullptr;
+	SubViewportContainer *subviewport_container = nullptr;
 
-	MenuButton *view_menu;
-	PopupMenu *display_submenu;
+	MenuButton *view_menu = nullptr;
+	PopupMenu *display_submenu = nullptr;
 
-	Control *surface;
-	SubViewport *viewport;
-	Camera3D *camera;
+	Control *surface = nullptr;
+	SubViewport *viewport = nullptr;
+	Camera3D *camera = nullptr;
 	bool transforming;
 	bool orthogonal;
 	bool auto_orthogonal;
@@ -221,17 +221,17 @@ private:
 	real_t freelook_speed;
 	Vector2 previous_mouse_position;
 
-	Label *info_label;
-	Label *cinema_label;
-	Label *locked_label;
-	Label *zoom_limit_label;
+	Label *info_label = nullptr;
+	Label *cinema_label = nullptr;
+	Label *locked_label = nullptr;
+	Label *zoom_limit_label = nullptr;
 
-	VBoxContainer *top_right_vbox;
-	ViewportRotationControl *rotation_control;
-	Gradient *frame_time_gradient;
-	Label *cpu_time_label;
-	Label *gpu_time_label;
-	Label *fps_label;
+	VBoxContainer *top_right_vbox = nullptr;
+	ViewportRotationControl *rotation_control = nullptr;
+	Gradient *frame_time_gradient = nullptr;
+	Label *cpu_time_label = nullptr;
+	Label *gpu_time_label = nullptr;
+	Label *fps_label = nullptr;
 
 	struct _RayResult {
 		Node3D *item = nullptr;
@@ -274,7 +274,7 @@ private:
 	bool clicked_wants_append;
 	bool selection_in_progress = false;
 
-	PopupMenu *selection_menu;
+	PopupMenu *selection_menu = nullptr;
 
 	enum NavigationZoomStyle {
 		NAVIGATION_ZOOM_VERTICAL,
@@ -375,9 +375,9 @@ private:
 
 	void _sinput(const Ref<InputEvent> &p_event);
 	void _update_freelook(real_t delta);
-	Node3DEditor *spatial_editor;
+	Node3DEditor *spatial_editor = nullptr;
 
-	Camera3D *previewing;
+	Camera3D *previewing = nullptr;
 	Camera3D *preview = nullptr;
 
 	bool previewing_cinema;
@@ -455,7 +455,7 @@ public:
 	Transform3D original_local;
 	Transform3D last_xform; // last transform
 	bool last_xform_dirty;
-	Node3D *sp;
+	Node3D *sp = nullptr;
 	RID sbox_instance;
 	RID sbox_instance_offset;
 	RID sbox_instance_xray;
@@ -537,13 +537,13 @@ public:
 	};
 
 private:
-	EditorSelection *editor_selection;
+	EditorSelection *editor_selection = nullptr;
 
-	Node3DEditorViewportContainer *viewport_base;
+	Node3DEditorViewportContainer *viewport_base = nullptr;
 	Node3DEditorViewport *viewports[VIEWPORTS_COUNT];
-	VSplitContainer *shader_split;
-	HSplitContainer *left_panel_split;
-	HSplitContainer *right_panel_split;
+	VSplitContainer *shader_split = nullptr;
+	HSplitContainer *left_panel_split = nullptr;
+	HSplitContainer *right_panel_split = nullptr;
 
 	/////
 
@@ -588,7 +588,7 @@ private:
 	Ref<StandardMaterial3D> cursor_material;
 
 	// Scene drag and drop support
-	Node3D *preview_node;
+	Node3D *preview_node = nullptr;
 	AABB preview_bounds;
 
 	struct Gizmo {
@@ -628,31 +628,31 @@ private:
 	Button *tool_button[TOOL_MAX];
 	Button *tool_option_button[TOOL_OPT_MAX];
 
-	MenuButton *transform_menu;
-	PopupMenu *gizmos_menu;
-	MenuButton *view_menu;
+	MenuButton *transform_menu = nullptr;
+	PopupMenu *gizmos_menu = nullptr;
+	MenuButton *view_menu = nullptr;
 
-	AcceptDialog *accept;
+	AcceptDialog *accept = nullptr;
 
-	ConfirmationDialog *snap_dialog;
-	ConfirmationDialog *xform_dialog;
-	ConfirmationDialog *settings_dialog;
+	ConfirmationDialog *snap_dialog = nullptr;
+	ConfirmationDialog *xform_dialog = nullptr;
+	ConfirmationDialog *settings_dialog = nullptr;
 
 	bool snap_enabled;
 	bool snap_key_enabled;
-	LineEdit *snap_translate;
-	LineEdit *snap_rotate;
-	LineEdit *snap_scale;
+	LineEdit *snap_translate = nullptr;
+	LineEdit *snap_rotate = nullptr;
+	LineEdit *snap_scale = nullptr;
 
 	LineEdit *xform_translate[3];
 	LineEdit *xform_rotate[3];
 	LineEdit *xform_scale[3];
-	OptionButton *xform_type;
+	OptionButton *xform_type = nullptr;
 
-	VBoxContainer *settings_vbc;
-	SpinBox *settings_fov;
-	SpinBox *settings_znear;
-	SpinBox *settings_zfar;
+	VBoxContainer *settings_vbc = nullptr;
+	SpinBox *settings_fov = nullptr;
+	SpinBox *settings_znear = nullptr;
+	SpinBox *settings_zfar = nullptr;
 
 	void _snap_changed();
 	void _snap_update();
@@ -662,14 +662,14 @@ private:
 	void _menu_gizmo_toggled(int p_option);
 	void _update_camera_override_button(bool p_game_running);
 	void _update_camera_override_viewport(Object *p_viewport);
-	HBoxContainer *hbc_menu;
+	HBoxContainer *hbc_menu = nullptr;
 	// Used for secondary menu items which are displayed depending on the currently selected node
 	// (such as MeshInstance's "Mesh" menu).
-	PanelContainer *context_menu_container;
-	HBoxContainer *hbc_context_menu;
+	PanelContainer *context_menu_container = nullptr;
+	HBoxContainer *hbc_context_menu = nullptr;
 
 	void _generate_selection_boxes();
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	int camera_override_viewport_id;
 
@@ -683,13 +683,13 @@ private:
 
 	void _toggle_maximize_view(Object *p_viewport);
 
-	Node *custom_camera;
+	Node *custom_camera = nullptr;
 
 	Object *_get_editor_data(Object *p_what);
 
 	Ref<Environment> viewport_environment;
 
-	Node3D *selected;
+	Node3D *selected = nullptr;
 
 	void _request_gizmo(Object *p_obj);
 	void _set_subgizmo_selection(Object *p_obj, Ref<Node3DGizmo> p_gizmo, int p_id, Transform3D p_transform = Transform3D());
@@ -712,18 +712,18 @@ private:
 	uint32_t world_env_count = 0;
 	uint32_t directional_light_count = 0;
 
-	Button *sun_button;
-	Label *sun_state;
-	Label *sun_title;
-	VBoxContainer *sun_vb;
-	Popup *sun_environ_popup;
-	Control *sun_direction;
-	EditorSpinSlider *sun_angle_altitude;
-	EditorSpinSlider *sun_angle_azimuth;
-	ColorPickerButton *sun_color;
-	EditorSpinSlider *sun_energy;
-	EditorSpinSlider *sun_max_distance;
-	Button *sun_add_to_scene;
+	Button *sun_button = nullptr;
+	Label *sun_state = nullptr;
+	Label *sun_title = nullptr;
+	VBoxContainer *sun_vb = nullptr;
+	Popup *sun_environ_popup = nullptr;
+	Control *sun_direction = nullptr;
+	EditorSpinSlider *sun_angle_altitude = nullptr;
+	EditorSpinSlider *sun_angle_azimuth = nullptr;
+	ColorPickerButton *sun_color = nullptr;
+	EditorSpinSlider *sun_energy = nullptr;
+	EditorSpinSlider *sun_max_distance = nullptr;
+	Button *sun_add_to_scene = nullptr;
 
 	void _sun_direction_draw();
 	void _sun_direction_input(const Ref<InputEvent> &p_event);
@@ -734,23 +734,23 @@ private:
 	Ref<Shader> sun_direction_shader;
 	Ref<ShaderMaterial> sun_direction_material;
 
-	Button *environ_button;
-	Label *environ_state;
-	Label *environ_title;
-	VBoxContainer *environ_vb;
-	ColorPickerButton *environ_sky_color;
-	ColorPickerButton *environ_ground_color;
-	EditorSpinSlider *environ_energy;
-	Button *environ_ao_button;
-	Button *environ_glow_button;
-	Button *environ_tonemap_button;
-	Button *environ_gi_button;
-	Button *environ_add_to_scene;
+	Button *environ_button = nullptr;
+	Label *environ_state = nullptr;
+	Label *environ_title = nullptr;
+	VBoxContainer *environ_vb = nullptr;
+	ColorPickerButton *environ_sky_color = nullptr;
+	ColorPickerButton *environ_ground_color = nullptr;
+	EditorSpinSlider *environ_energy = nullptr;
+	Button *environ_ao_button = nullptr;
+	Button *environ_glow_button = nullptr;
+	Button *environ_tonemap_button = nullptr;
+	Button *environ_gi_button = nullptr;
+	Button *environ_add_to_scene = nullptr;
 
-	Button *sun_environ_settings;
+	Button *sun_environ_settings = nullptr;
 
-	DirectionalLight3D *preview_sun;
-	WorldEnvironment *preview_environment;
+	DirectionalLight3D *preview_sun = nullptr;
+	WorldEnvironment *preview_environment = nullptr;
 	Ref<Environment> environment;
 	Ref<ProceduralSkyMaterial> sky_material;
 
@@ -868,7 +868,7 @@ public:
 class Node3DEditorPlugin : public EditorPlugin {
 	GDCLASS(Node3DEditorPlugin, EditorPlugin);
 
-	Node3DEditor *spatial_editor;
+	Node3DEditor *spatial_editor = nullptr;
 
 public:
 	Node3DEditor *get_spatial_editor() { return spatial_editor; }
diff --git a/editor/plugins/occluder_instance_3d_editor_plugin.h b/editor/plugins/occluder_instance_3d_editor_plugin.h
index 24f31b2ea8a8..360b7297cf1a 100644
--- a/editor/plugins/occluder_instance_3d_editor_plugin.h
+++ b/editor/plugins/occluder_instance_3d_editor_plugin.h
@@ -40,11 +40,11 @@ class EditorFileDialog;
 class OccluderInstance3DEditorPlugin : public EditorPlugin {
 	GDCLASS(OccluderInstance3DEditorPlugin, EditorPlugin);
 
-	OccluderInstance3D *occluder_instance;
+	OccluderInstance3D *occluder_instance = nullptr;
 
-	Button *bake;
+	Button *bake = nullptr;
 
-	EditorFileDialog *file_dialog;
+	EditorFileDialog *file_dialog = nullptr;
 
 	void _bake_select_file(const String &p_file);
 	void _bake();
diff --git a/editor/plugins/ot_features_plugin.h b/editor/plugins/ot_features_plugin.h
index fcbc8692cad7..6639148080f4 100644
--- a/editor/plugins/ot_features_plugin.h
+++ b/editor/plugins/ot_features_plugin.h
@@ -38,7 +38,7 @@
 
 class OpenTypeFeaturesEditor : public EditorProperty {
 	GDCLASS(OpenTypeFeaturesEditor, EditorProperty);
-	EditorSpinSlider *spin;
+	EditorSpinSlider *spin = nullptr;
 	bool setting = true;
 	void _value_changed(double p_val);
 	Button *button = nullptr;
diff --git a/editor/plugins/path_2d_editor_plugin.h b/editor/plugins/path_2d_editor_plugin.h
index 926a859f8bad..ff74aeedf733 100644
--- a/editor/plugins/path_2d_editor_plugin.h
+++ b/editor/plugins/path_2d_editor_plugin.h
@@ -40,14 +40,14 @@ class CanvasItemEditor;
 class Path2DEditor : public HBoxContainer {
 	GDCLASS(Path2DEditor, HBoxContainer);
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
-	CanvasItemEditor *canvas_item_editor;
-	Panel *panel;
-	Path2D *node;
+	CanvasItemEditor *canvas_item_editor = nullptr;
+	Panel *panel = nullptr;
+	Path2D *node = nullptr;
 
-	HBoxContainer *base_hb;
-	Separator *sep;
+	HBoxContainer *base_hb = nullptr;
+	Separator *sep = nullptr;
 
 	enum Mode {
 		MODE_CREATE,
@@ -58,12 +58,12 @@ class Path2DEditor : public HBoxContainer {
 	};
 
 	Mode mode;
-	Button *curve_create;
-	Button *curve_edit;
-	Button *curve_edit_curve;
-	Button *curve_del;
-	Button *curve_close;
-	MenuButton *handle_menu;
+	Button *curve_create = nullptr;
+	Button *curve_edit = nullptr;
+	Button *curve_edit_curve = nullptr;
+	Button *curve_del = nullptr;
+	Button *curve_close = nullptr;
+	MenuButton *handle_menu = nullptr;
 
 	bool mirror_handle_angle;
 	bool mirror_handle_length;
@@ -110,7 +110,7 @@ public:
 class Path2DEditorPlugin : public EditorPlugin {
 	GDCLASS(Path2DEditorPlugin, EditorPlugin);
 
-	Path2DEditor *path2d_editor;
+	Path2DEditor *path2d_editor = nullptr;
 
 public:
 	virtual bool forward_canvas_gui_input(const Ref<InputEvent> &p_event) override { return path2d_editor->forward_gui_input(p_event); }
diff --git a/editor/plugins/path_3d_editor_plugin.h b/editor/plugins/path_3d_editor_plugin.h
index 3c6ca65437c2..72c24732c098 100644
--- a/editor/plugins/path_3d_editor_plugin.h
+++ b/editor/plugins/path_3d_editor_plugin.h
@@ -40,7 +40,7 @@
 class Path3DGizmo : public EditorNode3DGizmo {
 	GDCLASS(Path3DGizmo, EditorNode3DGizmo);
 
-	Path3D *path;
+	Path3D *path = nullptr;
 	mutable Vector3 original;
 	mutable float orig_in_length;
 	mutable float orig_out_length;
@@ -70,14 +70,14 @@ public:
 class Path3DEditorPlugin : public EditorPlugin {
 	GDCLASS(Path3DEditorPlugin, EditorPlugin);
 
-	Separator *sep;
-	Button *curve_create;
-	Button *curve_edit;
-	Button *curve_del;
-	Button *curve_close;
-	MenuButton *handle_menu;
+	Separator *sep = nullptr;
+	Button *curve_create = nullptr;
+	Button *curve_edit = nullptr;
+	Button *curve_del = nullptr;
+	Button *curve_close = nullptr;
+	MenuButton *handle_menu = nullptr;
 
-	Path3D *path;
+	Path3D *path = nullptr;
 
 	void _update_theme();
 
diff --git a/editor/plugins/physical_bone_3d_editor_plugin.h b/editor/plugins/physical_bone_3d_editor_plugin.h
index 4051644b549e..93e722a43237 100644
--- a/editor/plugins/physical_bone_3d_editor_plugin.h
+++ b/editor/plugins/physical_bone_3d_editor_plugin.h
@@ -39,8 +39,8 @@
 class PhysicalBone3DEditor : public Object {
 	GDCLASS(PhysicalBone3DEditor, Object);
 
-	HBoxContainer *spatial_editor_hb;
-	Button *button_transform_joint;
+	HBoxContainer *spatial_editor_hb = nullptr;
+	Button *button_transform_joint = nullptr;
 
 	PhysicalBone3D *selected = nullptr;
 
diff --git a/editor/plugins/polygon_2d_editor_plugin.h b/editor/plugins/polygon_2d_editor_plugin.h
index 0a5def902cb4..4403d1e9c74f 100644
--- a/editor/plugins/polygon_2d_editor_plugin.h
+++ b/editor/plugins/polygon_2d_editor_plugin.h
@@ -68,38 +68,38 @@ class Polygon2DEditor : public AbstractPolygon2DEditor {
 	Button *uv_edit_mode[4];
 	Ref<ButtonGroup> uv_edit_group;
 
-	Polygon2D *node;
+	Polygon2D *node = nullptr;
 
 	UVMode uv_mode;
-	AcceptDialog *uv_edit;
+	AcceptDialog *uv_edit = nullptr;
 	Button *uv_button[UV_MODE_MAX];
-	Button *b_snap_enable;
-	Button *b_snap_grid;
-	Panel *uv_edit_draw;
-	HSlider *uv_zoom;
-	SpinBox *uv_zoom_value;
-	HScrollBar *uv_hscroll;
-	VScrollBar *uv_vscroll;
-	MenuButton *uv_menu;
-	TextureRect *uv_icon_zoom;
+	Button *b_snap_enable = nullptr;
+	Button *b_snap_grid = nullptr;
+	Panel *uv_edit_draw = nullptr;
+	HSlider *uv_zoom = nullptr;
+	SpinBox *uv_zoom_value = nullptr;
+	HScrollBar *uv_hscroll = nullptr;
+	VScrollBar *uv_vscroll = nullptr;
+	MenuButton *uv_menu = nullptr;
+	TextureRect *uv_icon_zoom = nullptr;
 
 	Ref<ViewPanner> uv_panner;
 	void _uv_scroll_callback(Vector2 p_scroll_vec, bool p_alt);
 	void _uv_pan_callback(Vector2 p_scroll_vec);
 	void _uv_zoom_callback(Vector2 p_scroll_vec, Vector2 p_origin, bool p_alt);
 
-	VBoxContainer *bone_scroll_main_vb;
-	ScrollContainer *bone_scroll;
-	VBoxContainer *bone_scroll_vb;
-	Button *sync_bones;
-	HSlider *bone_paint_strength;
-	SpinBox *bone_paint_radius;
-	Label *bone_paint_radius_label;
+	VBoxContainer *bone_scroll_main_vb = nullptr;
+	ScrollContainer *bone_scroll = nullptr;
+	VBoxContainer *bone_scroll_vb = nullptr;
+	Button *sync_bones = nullptr;
+	HSlider *bone_paint_strength = nullptr;
+	SpinBox *bone_paint_radius = nullptr;
+	Label *bone_paint_radius_label = nullptr;
 	bool bone_painting;
 	int bone_painting_bone;
 	Vector<float> prev_weights;
 	Vector2 bone_paint_pos;
-	AcceptDialog *grid_settings;
+	AcceptDialog *grid_settings = nullptr;
 
 	void _sync_bones();
 	void _update_bone_list();
@@ -123,9 +123,9 @@ class Polygon2DEditor : public AbstractPolygon2DEditor {
 	Vector2 uv_drag_from;
 	bool updating_uv_scroll;
 
-	AcceptDialog *error;
+	AcceptDialog *error = nullptr;
 
-	Button *button_uv;
+	Button *button_uv = nullptr;
 
 	bool use_snap;
 	bool snap_show_grid;
diff --git a/editor/plugins/polygon_3d_editor_plugin.h b/editor/plugins/polygon_3d_editor_plugin.h
index e92dcaf3190b..3ad7a4df58e8 100644
--- a/editor/plugins/polygon_3d_editor_plugin.h
+++ b/editor/plugins/polygon_3d_editor_plugin.h
@@ -41,7 +41,7 @@ class CanvasItemEditor;
 class Polygon3DEditor : public HBoxContainer {
 	GDCLASS(Polygon3DEditor, HBoxContainer);
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 	enum Mode {
 		MODE_CREATE,
 		MODE_EDIT,
@@ -50,21 +50,21 @@ class Polygon3DEditor : public HBoxContainer {
 
 	Mode mode;
 
-	Button *button_create;
-	Button *button_edit;
+	Button *button_create = nullptr;
+	Button *button_edit = nullptr;
 
 	Ref<StandardMaterial3D> line_material;
 	Ref<StandardMaterial3D> handle_material;
 
-	Panel *panel;
-	Node3D *node;
+	Panel *panel = nullptr;
+	Node3D *node = nullptr;
 	Ref<Resource> node_resource;
 	Ref<ImmediateMesh> imesh;
-	MeshInstance3D *imgeom;
-	MeshInstance3D *pointsm;
+	MeshInstance3D *imgeom = nullptr;
+	MeshInstance3D *pointsm = nullptr;
 	Ref<ArrayMesh> m;
 
-	MenuButton *options;
+	MenuButton *options = nullptr;
 
 	int edited_point;
 	Vector2 edited_point_pos;
@@ -98,7 +98,7 @@ public:
 class Polygon3DEditorPlugin : public EditorPlugin {
 	GDCLASS(Polygon3DEditorPlugin, EditorPlugin);
 
-	Polygon3DEditor *polygon_editor;
+	Polygon3DEditor *polygon_editor = nullptr;
 
 public:
 	virtual EditorPlugin::AfterGUIInput forward_spatial_gui_input(Camera3D *p_camera, const Ref<InputEvent> &p_event) override { return polygon_editor->forward_spatial_gui_input(p_camera, p_event); }
diff --git a/editor/plugins/replication_editor_plugin.h b/editor/plugins/replication_editor_plugin.h
index 46274d188cc2..08e86d1617d4 100644
--- a/editor/plugins/replication_editor_plugin.h
+++ b/editor/plugins/replication_editor_plugin.h
@@ -51,7 +51,7 @@ private:
 
 	Ref<SceneReplicationConfig> config;
 	NodePath deleting;
-	Tree *tree;
+	Tree *tree = nullptr;
 	bool keying = false;
 
 	Ref<Texture2D> _get_class_icon(const Node *p_node);
@@ -84,7 +84,7 @@ class ReplicationEditorPlugin : public EditorPlugin {
 	GDCLASS(ReplicationEditorPlugin, EditorPlugin);
 
 private:
-	ReplicationEditor *repl_editor;
+	ReplicationEditor *repl_editor = nullptr;
 
 	void _node_removed(Node *p_node);
 	void _keying_changed();
diff --git a/editor/plugins/resource_preloader_editor_plugin.h b/editor/plugins/resource_preloader_editor_plugin.h
index 8e81239f1bc3..0b799c13c6f0 100644
--- a/editor/plugins/resource_preloader_editor_plugin.h
+++ b/editor/plugins/resource_preloader_editor_plugin.h
@@ -47,16 +47,16 @@ class ResourcePreloaderEditor : public PanelContainer {
 		BUTTON_REMOVE
 	};
 
-	Button *load;
-	Button *paste;
-	Tree *tree;
+	Button *load = nullptr;
+	Button *paste = nullptr;
+	Tree *tree = nullptr;
 	bool loading_scene;
 
-	EditorFileDialog *file;
+	EditorFileDialog *file = nullptr;
 
-	AcceptDialog *dialog;
+	AcceptDialog *dialog = nullptr;
 
-	ResourcePreloader *preloader;
+	ResourcePreloader *preloader = nullptr;
 
 	void _load_pressed();
 	void _files_load_request(const Vector<String> &p_paths);
@@ -66,7 +66,7 @@ class ResourcePreloaderEditor : public PanelContainer {
 	void _cell_button_pressed(Object *p_item, int p_column, int p_id);
 	void _item_edited();
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	Variant get_drag_data_fw(const Point2 &p_point, Control *p_from);
 	bool can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const;
@@ -87,8 +87,8 @@ public:
 class ResourcePreloaderEditorPlugin : public EditorPlugin {
 	GDCLASS(ResourcePreloaderEditorPlugin, EditorPlugin);
 
-	ResourcePreloaderEditor *preloader_editor;
-	Button *button;
+	ResourcePreloaderEditor *preloader_editor = nullptr;
+	Button *button = nullptr;
 
 public:
 	virtual String get_name() const override { return "ResourcePreloader"; }
diff --git a/editor/plugins/root_motion_editor_plugin.h b/editor/plugins/root_motion_editor_plugin.h
index c2866f269b6a..5b8c1d77b380 100644
--- a/editor/plugins/root_motion_editor_plugin.h
+++ b/editor/plugins/root_motion_editor_plugin.h
@@ -38,12 +38,12 @@
 
 class EditorPropertyRootMotion : public EditorProperty {
 	GDCLASS(EditorPropertyRootMotion, EditorProperty);
-	Button *assign;
-	Button *clear;
+	Button *assign = nullptr;
+	Button *clear = nullptr;
 	NodePath base_hint;
 
-	ConfirmationDialog *filter_dialog;
-	Tree *filters;
+	ConfirmationDialog *filter_dialog = nullptr;
+	Tree *filters = nullptr;
 
 	void _confirmed();
 	void _node_assign();
diff --git a/editor/plugins/script_editor_plugin.h b/editor/plugins/script_editor_plugin.h
index a99e269d4615..5eeca7a3346c 100644
--- a/editor/plugins/script_editor_plugin.h
+++ b/editor/plugins/script_editor_plugin.h
@@ -102,8 +102,8 @@ public:
 class ScriptEditorQuickOpen : public ConfirmationDialog {
 	GDCLASS(ScriptEditorQuickOpen, ConfirmationDialog);
 
-	LineEdit *search_box;
-	Tree *search_options;
+	LineEdit *search_box = nullptr;
+	Tree *search_options = nullptr;
 	String function;
 
 	void _update_search();
@@ -242,55 +242,55 @@ class ScriptEditor : public PanelContainer {
 		DISPLAY_FULL_PATH,
 	};
 
-	HBoxContainer *menu_hb;
-	MenuButton *file_menu;
-	MenuButton *edit_menu;
-	MenuButton *script_search_menu;
-	MenuButton *debug_menu;
-	PopupMenu *context_menu;
-	Timer *autosave_timer;
+	HBoxContainer *menu_hb = nullptr;
+	MenuButton *file_menu = nullptr;
+	MenuButton *edit_menu = nullptr;
+	MenuButton *script_search_menu = nullptr;
+	MenuButton *debug_menu = nullptr;
+	PopupMenu *context_menu = nullptr;
+	Timer *autosave_timer = nullptr;
 	uint64_t idle;
 
-	PopupMenu *recent_scripts;
-	PopupMenu *theme_submenu;
+	PopupMenu *recent_scripts = nullptr;
+	PopupMenu *theme_submenu = nullptr;
 
-	Button *help_search;
-	Button *site_search;
-	EditorHelpSearch *help_search_dialog;
+	Button *help_search = nullptr;
+	Button *site_search = nullptr;
+	EditorHelpSearch *help_search_dialog = nullptr;
 
-	ItemList *script_list;
-	HSplitContainer *script_split;
-	ItemList *members_overview;
-	LineEdit *filter_scripts;
-	LineEdit *filter_methods;
-	VBoxContainer *scripts_vbox;
-	VBoxContainer *overview_vbox;
-	HBoxContainer *buttons_hbox;
-	Label *filename;
-	Button *members_overview_alphabeta_sort_button;
+	ItemList *script_list = nullptr;
+	HSplitContainer *script_split = nullptr;
+	ItemList *members_overview = nullptr;
+	LineEdit *filter_scripts = nullptr;
+	LineEdit *filter_methods = nullptr;
+	VBoxContainer *scripts_vbox = nullptr;
+	VBoxContainer *overview_vbox = nullptr;
+	HBoxContainer *buttons_hbox = nullptr;
+	Label *filename = nullptr;
+	Button *members_overview_alphabeta_sort_button = nullptr;
 	bool members_overview_enabled;
-	ItemList *help_overview;
+	ItemList *help_overview = nullptr;
 	bool help_overview_enabled;
-	VSplitContainer *list_split;
-	TabContainer *tab_container;
-	EditorFileDialog *file_dialog;
-	AcceptDialog *error_dialog;
-	ConfirmationDialog *erase_tab_confirm;
-	ScriptCreateDialog *script_create_dialog;
-	Button *scripts_visible;
-	FindReplaceBar *find_replace_bar;
+	VSplitContainer *list_split = nullptr;
+	TabContainer *tab_container = nullptr;
+	EditorFileDialog *file_dialog = nullptr;
+	AcceptDialog *error_dialog = nullptr;
+	ConfirmationDialog *erase_tab_confirm = nullptr;
+	ScriptCreateDialog *script_create_dialog = nullptr;
+	Button *scripts_visible = nullptr;
+	FindReplaceBar *find_replace_bar = nullptr;
 
 	String current_theme;
 
-	TextureRect *script_icon;
-	Label *script_name_label;
+	TextureRect *script_icon = nullptr;
+	Label *script_name_label = nullptr;
 
-	Button *script_back;
-	Button *script_forward;
+	Button *script_back = nullptr;
+	Button *script_forward = nullptr;
 
-	FindInFilesDialog *find_in_files_dialog;
-	FindInFilesPanel *find_in_files;
-	Button *find_in_files_button;
+	FindInFilesDialog *find_in_files_dialog = nullptr;
+	FindInFilesPanel *find_in_files = nullptr;
+	Button *find_in_files_button = nullptr;
 
 	enum {
 		SCRIPT_EDITOR_FUNC_MAX = 32,
@@ -320,8 +320,8 @@ class ScriptEditor : public PanelContainer {
 	bool _has_script_tab() const;
 	void _prepare_file_menu();
 
-	Tree *disk_changed_list;
-	ConfirmationDialog *disk_changed;
+	Tree *disk_changed_list = nullptr;
+	ConfirmationDialog *disk_changed = nullptr;
 
 	bool restoring_layout;
 
@@ -361,7 +361,7 @@ class ScriptEditor : public PanelContainer {
 
 	void _update_selected_editor_menu();
 
-	EditorScriptCodeCompletionCache *completion_cache;
+	EditorScriptCodeCompletionCache *completion_cache = nullptr;
 
 	void _editor_stop();
 
@@ -528,7 +528,7 @@ public:
 class ScriptEditorPlugin : public EditorPlugin {
 	GDCLASS(ScriptEditorPlugin, EditorPlugin);
 
-	ScriptEditor *script_editor;
+	ScriptEditor *script_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "Script"; }
diff --git a/editor/plugins/shader_editor_plugin.h b/editor/plugins/shader_editor_plugin.h
index 600b14362e3d..067711c75cce 100644
--- a/editor/plugins/shader_editor_plugin.h
+++ b/editor/plugins/shader_editor_plugin.h
@@ -108,19 +108,19 @@ class ShaderEditor : public PanelContainer {
 		HELP_DOCS,
 	};
 
-	MenuButton *edit_menu;
-	MenuButton *search_menu;
-	PopupMenu *bookmarks_menu;
-	MenuButton *help_menu;
-	PopupMenu *context_menu;
+	MenuButton *edit_menu = nullptr;
+	MenuButton *search_menu = nullptr;
+	PopupMenu *bookmarks_menu = nullptr;
+	MenuButton *help_menu = nullptr;
+	PopupMenu *context_menu = nullptr;
 	RichTextLabel *warnings_panel = nullptr;
 	uint64_t idle;
 
-	GotoLineDialog *goto_line_dialog;
-	ConfirmationDialog *erase_tab_confirm;
-	ConfirmationDialog *disk_changed;
+	GotoLineDialog *goto_line_dialog = nullptr;
+	ConfirmationDialog *erase_tab_confirm = nullptr;
+	ConfirmationDialog *disk_changed = nullptr;
 
-	ShaderTextEditor *shader_editor;
+	ShaderTextEditor *shader_editor = nullptr;
 
 	void _menu_option(int p_option);
 	mutable Ref<Shader> shader;
@@ -161,8 +161,8 @@ class ShaderEditorPlugin : public EditorPlugin {
 	GDCLASS(ShaderEditorPlugin, EditorPlugin);
 
 	bool _2d;
-	ShaderEditor *shader_editor;
-	Button *button;
+	ShaderEditor *shader_editor = nullptr;
+	Button *button = nullptr;
 
 public:
 	virtual String get_name() const override { return "Shader"; }
diff --git a/editor/plugins/shader_file_editor_plugin.h b/editor/plugins/shader_file_editor_plugin.h
index 5ee2d01dbf8d..1ebd6442828c 100644
--- a/editor/plugins/shader_file_editor_plugin.h
+++ b/editor/plugins/shader_file_editor_plugin.h
@@ -48,10 +48,10 @@ class ShaderFileEditor : public PanelContainer {
 
 	Ref<RDShaderFile> shader_file;
 
-	HBoxContainer *stage_hb;
-	ItemList *versions;
+	HBoxContainer *stage_hb = nullptr;
+	ItemList *versions = nullptr;
 	Button *stages[RD::SHADER_STAGE_MAX];
-	RichTextLabel *error_text;
+	RichTextLabel *error_text = nullptr;
 
 	void _update_version(const StringName &p_version_txt, const RenderingDevice::ShaderStage p_stage);
 	void _version_selected(int p_stage);
@@ -74,8 +74,8 @@ public:
 class ShaderFileEditorPlugin : public EditorPlugin {
 	GDCLASS(ShaderFileEditorPlugin, EditorPlugin);
 
-	ShaderFileEditor *shader_editor;
-	Button *button;
+	ShaderFileEditor *shader_editor = nullptr;
+	Button *button = nullptr;
 
 public:
 	virtual String get_name() const override { return "ShaderFile"; }
diff --git a/editor/plugins/skeleton_2d_editor_plugin.h b/editor/plugins/skeleton_2d_editor_plugin.h
index 004dac7b05e7..295725b75139 100644
--- a/editor/plugins/skeleton_2d_editor_plugin.h
+++ b/editor/plugins/skeleton_2d_editor_plugin.h
@@ -43,10 +43,10 @@ class Skeleton2DEditor : public Control {
 		MENU_OPTION_MAKE_REST,
 	};
 
-	Skeleton2D *node;
+	Skeleton2D *node = nullptr;
 
-	MenuButton *options;
-	AcceptDialog *err_dialog;
+	MenuButton *options = nullptr;
+	AcceptDialog *err_dialog = nullptr;
 
 	void _menu_option(int p_option);
 
@@ -65,7 +65,7 @@ public:
 class Skeleton2DEditorPlugin : public EditorPlugin {
 	GDCLASS(Skeleton2DEditorPlugin, EditorPlugin);
 
-	Skeleton2DEditor *sprite_editor;
+	Skeleton2DEditor *sprite_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "Skeleton2D"; }
diff --git a/editor/plugins/skeleton_3d_editor_plugin.h b/editor/plugins/skeleton_3d_editor_plugin.h
index 2dbb552428d2..911e39a34f7a 100644
--- a/editor/plugins/skeleton_3d_editor_plugin.h
+++ b/editor/plugins/skeleton_3d_editor_plugin.h
@@ -60,10 +60,10 @@ class BoneTransformEditor : public VBoxContainer {
 
 	Rect2 background_rects[5];
 
-	Skeleton3D *skeleton;
+	Skeleton3D *skeleton = nullptr;
 	// String property;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	bool toggle_enabled = false;
 	bool updating = false;
@@ -108,26 +108,26 @@ class Skeleton3DEditor : public VBoxContainer {
 		Transform3D relative_rest; // Relative to skeleton node.
 	};
 
-	EditorInspectorPluginSkeleton *editor_plugin;
+	EditorInspectorPluginSkeleton *editor_plugin = nullptr;
 
-	Skeleton3D *skeleton;
+	Skeleton3D *skeleton = nullptr;
 
 	Tree *joint_tree = nullptr;
 	BoneTransformEditor *rest_editor = nullptr;
 	BoneTransformEditor *pose_editor = nullptr;
 
-	VSeparator *separator;
+	VSeparator *separator = nullptr;
 	MenuButton *skeleton_options = nullptr;
-	Button *edit_mode_button;
+	Button *edit_mode_button = nullptr;
 
 	bool edit_mode = false;
 
-	HBoxContainer *animation_hb;
-	Button *key_loc_button;
-	Button *key_rot_button;
-	Button *key_scale_button;
-	Button *key_insert_button;
-	Button *key_insert_all_button;
+	HBoxContainer *animation_hb = nullptr;
+	Button *key_loc_button = nullptr;
+	Button *key_rot_button = nullptr;
+	Button *key_scale_button = nullptr;
+	Button *key_insert_button = nullptr;
+	Button *key_insert_all_button = nullptr;
 
 	EditorFileDialog *file_dialog = nullptr;
 
@@ -163,7 +163,7 @@ class Skeleton3DEditor : public VBoxContainer {
 	void set_bone_options_enabled(const bool p_bone_options_enabled);
 
 	// Handle.
-	MeshInstance3D *handles_mesh_instance;
+	MeshInstance3D *handles_mesh_instance = nullptr;
 	Ref<ImmediateMesh> handles_mesh;
 	Ref<ShaderMaterial> handle_material;
 	Ref<Shader> handle_shader;
@@ -220,7 +220,7 @@ class EditorInspectorPluginSkeleton : public EditorInspectorPlugin {
 
 	friend class Skeleton3DEditorPlugin;
 
-	Skeleton3DEditor *skel_editor;
+	Skeleton3DEditor *skel_editor = nullptr;
 
 public:
 	virtual bool can_handle(Object *p_object) override;
@@ -230,7 +230,7 @@ public:
 class Skeleton3DEditorPlugin : public EditorPlugin {
 	GDCLASS(Skeleton3DEditorPlugin, EditorPlugin);
 
-	EditorInspectorPluginSkeleton *skeleton_plugin;
+	EditorInspectorPluginSkeleton *skeleton_plugin = nullptr;
 
 public:
 	virtual EditorPlugin::AfterGUIInput forward_spatial_gui_input(Camera3D *p_camera, const Ref<InputEvent> &p_event) override;
diff --git a/editor/plugins/skeleton_ik_3d_editor_plugin.h b/editor/plugins/skeleton_ik_3d_editor_plugin.h
index f71e78823210..26aead6d6767 100644
--- a/editor/plugins/skeleton_ik_3d_editor_plugin.h
+++ b/editor/plugins/skeleton_ik_3d_editor_plugin.h
@@ -38,9 +38,9 @@ class SkeletonIK3D;
 class SkeletonIK3DEditorPlugin : public EditorPlugin {
 	GDCLASS(SkeletonIK3DEditorPlugin, EditorPlugin);
 
-	SkeletonIK3D *skeleton_ik;
+	SkeletonIK3D *skeleton_ik = nullptr;
 
-	Button *play_btn;
+	Button *play_btn = nullptr;
 
 	void _play();
 
diff --git a/editor/plugins/sprite_2d_editor_plugin.h b/editor/plugins/sprite_2d_editor_plugin.h
index 46953b0937e8..8e3dc19c7e16 100644
--- a/editor/plugins/sprite_2d_editor_plugin.h
+++ b/editor/plugins/sprite_2d_editor_plugin.h
@@ -47,16 +47,16 @@ class Sprite2DEditor : public Control {
 
 	Menu selected_menu_item;
 
-	Sprite2D *node;
+	Sprite2D *node = nullptr;
 
-	MenuButton *options;
+	MenuButton *options = nullptr;
 
-	ConfirmationDialog *outline_dialog;
+	ConfirmationDialog *outline_dialog = nullptr;
 
-	AcceptDialog *err_dialog;
+	AcceptDialog *err_dialog = nullptr;
 
-	ConfirmationDialog *debug_uv_dialog;
-	Control *debug_uv;
+	ConfirmationDialog *debug_uv_dialog = nullptr;
+	Control *debug_uv = nullptr;
 	Vector<Vector2> uv_lines;
 	Vector<Vector<Vector2>> outline_lines;
 	Vector<Vector<Vector2>> computed_outline_lines;
@@ -64,10 +64,10 @@ class Sprite2DEditor : public Control {
 	Vector<Vector2> computed_uv;
 	Vector<int> computed_indices;
 
-	SpinBox *simplification;
-	SpinBox *grow_pixels;
-	SpinBox *shrink_pixels;
-	Button *update_preview;
+	SpinBox *simplification = nullptr;
+	SpinBox *grow_pixels = nullptr;
+	SpinBox *shrink_pixels = nullptr;
+	Button *update_preview = nullptr;
 
 	void _menu_option(int p_option);
 
@@ -98,7 +98,7 @@ public:
 class Sprite2DEditorPlugin : public EditorPlugin {
 	GDCLASS(Sprite2DEditorPlugin, EditorPlugin);
 
-	Sprite2DEditor *sprite_editor;
+	Sprite2DEditor *sprite_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "Sprite2D"; }
diff --git a/editor/plugins/sprite_frames_editor_plugin.h b/editor/plugins/sprite_frames_editor_plugin.h
index 872a88e26291..b0213012a2cf 100644
--- a/editor/plugins/sprite_frames_editor_plugin.h
+++ b/editor/plugins/sprite_frames_editor_plugin.h
@@ -48,48 +48,48 @@ class EditorFileDialog;
 class SpriteFramesEditor : public HSplitContainer {
 	GDCLASS(SpriteFramesEditor, HSplitContainer);
 
-	Button *load;
-	Button *load_sheet;
-	Button *_delete;
-	Button *copy;
-	Button *paste;
-	Button *empty;
-	Button *empty2;
-	Button *move_up;
-	Button *move_down;
-	Button *zoom_out;
-	Button *zoom_reset;
-	Button *zoom_in;
-	ItemList *tree;
+	Button *load = nullptr;
+	Button *load_sheet = nullptr;
+	Button *_delete = nullptr;
+	Button *copy = nullptr;
+	Button *paste = nullptr;
+	Button *empty = nullptr;
+	Button *empty2 = nullptr;
+	Button *move_up = nullptr;
+	Button *move_down = nullptr;
+	Button *zoom_out = nullptr;
+	Button *zoom_reset = nullptr;
+	Button *zoom_in = nullptr;
+	ItemList *tree = nullptr;
 	bool loading_scene;
 	int sel;
 
-	Button *new_anim;
-	Button *remove_anim;
+	Button *new_anim = nullptr;
+	Button *remove_anim = nullptr;
 
-	Tree *animations;
-	SpinBox *anim_speed;
-	CheckButton *anim_loop;
+	Tree *animations = nullptr;
+	SpinBox *anim_speed = nullptr;
+	CheckButton *anim_loop = nullptr;
 
-	EditorFileDialog *file;
+	EditorFileDialog *file = nullptr;
 
-	AcceptDialog *dialog;
+	AcceptDialog *dialog = nullptr;
 
-	SpriteFrames *frames;
+	SpriteFrames *frames = nullptr;
 
 	StringName edited_anim;
 
-	ConfirmationDialog *delete_dialog;
+	ConfirmationDialog *delete_dialog = nullptr;
 
-	ConfirmationDialog *split_sheet_dialog;
-	ScrollContainer *split_sheet_scroll;
-	TextureRect *split_sheet_preview;
-	SpinBox *split_sheet_h;
-	SpinBox *split_sheet_v;
-	Button *split_sheet_zoom_out;
-	Button *split_sheet_zoom_reset;
-	Button *split_sheet_zoom_in;
-	EditorFileDialog *file_split_sheet;
+	ConfirmationDialog *split_sheet_dialog = nullptr;
+	ScrollContainer *split_sheet_scroll = nullptr;
+	TextureRect *split_sheet_preview = nullptr;
+	SpinBox *split_sheet_h = nullptr;
+	SpinBox *split_sheet_v = nullptr;
+	Button *split_sheet_zoom_out = nullptr;
+	Button *split_sheet_zoom_reset = nullptr;
+	Button *split_sheet_zoom_in = nullptr;
+	EditorFileDialog *file_split_sheet = nullptr;
 	Set<int> frames_selected;
 	Set<int> frames_toggled_by_mouse_hover;
 	int last_frame_selected;
@@ -129,7 +129,7 @@ class SpriteFramesEditor : public HSplitContainer {
 
 	bool updating;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	Variant get_drag_data_fw(const Point2 &p_point, Control *p_from);
 	bool can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const;
@@ -164,8 +164,8 @@ public:
 class SpriteFramesEditorPlugin : public EditorPlugin {
 	GDCLASS(SpriteFramesEditorPlugin, EditorPlugin);
 
-	SpriteFramesEditor *frames_editor;
-	Button *button;
+	SpriteFramesEditor *frames_editor = nullptr;
+	Button *button = nullptr;
 
 public:
 	virtual String get_name() const override { return "SpriteFrames"; }
diff --git a/editor/plugins/style_box_editor_plugin.h b/editor/plugins/style_box_editor_plugin.h
index bdebebbe1c55..663440ae3115 100644
--- a/editor/plugins/style_box_editor_plugin.h
+++ b/editor/plugins/style_box_editor_plugin.h
@@ -40,7 +40,7 @@
 class StyleBoxPreview : public VBoxContainer {
 	GDCLASS(StyleBoxPreview, VBoxContainer);
 
-	Control *preview;
+	Control *preview = nullptr;
 	Ref<StyleBox> stylebox;
 
 	void _sb_changed();
diff --git a/editor/plugins/text_control_editor_plugin.h b/editor/plugins/text_control_editor_plugin.h
index 1349003a9c74..a475f6eba398 100644
--- a/editor/plugins/text_control_editor_plugin.h
+++ b/editor/plugins/text_control_editor_plugin.h
@@ -100,7 +100,7 @@ public:
 class TextControlEditorPlugin : public EditorPlugin {
 	GDCLASS(TextControlEditorPlugin, EditorPlugin);
 
-	TextControlEditor *text_ctl_editor;
+	TextControlEditor *text_ctl_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "TextControlFontEditor"; }
diff --git a/editor/plugins/texture_3d_editor_plugin.h b/editor/plugins/texture_3d_editor_plugin.h
index d418032477a6..2f7f6f83bbf9 100644
--- a/editor/plugins/texture_3d_editor_plugin.h
+++ b/editor/plugins/texture_3d_editor_plugin.h
@@ -39,14 +39,14 @@
 class Texture3DEditor : public Control {
 	GDCLASS(Texture3DEditor, Control);
 
-	SpinBox *layer;
-	Label *info;
+	SpinBox *layer = nullptr;
+	Label *info = nullptr;
 	Ref<Texture3D> texture;
 
 	Ref<Shader> shader;
 	Ref<ShaderMaterial> material;
 
-	Control *texture_rect;
+	Control *texture_rect = nullptr;
 
 	void _make_shaders();
 
diff --git a/editor/plugins/texture_layered_editor_plugin.h b/editor/plugins/texture_layered_editor_plugin.h
index 1c59ec4db07c..830916e954d8 100644
--- a/editor/plugins/texture_layered_editor_plugin.h
+++ b/editor/plugins/texture_layered_editor_plugin.h
@@ -39,8 +39,8 @@
 class TextureLayeredEditor : public Control {
 	GDCLASS(TextureLayeredEditor, Control);
 
-	SpinBox *layer;
-	Label *info;
+	SpinBox *layer = nullptr;
+	Label *info = nullptr;
 	Ref<TextureLayered> texture;
 
 	Ref<Shader> shaders[3];
@@ -48,7 +48,7 @@ class TextureLayeredEditor : public Control {
 
 	float x_rot = 0;
 	float y_rot = 0;
-	Control *texture_rect;
+	Control *texture_rect = nullptr;
 
 	void _make_shaders();
 
diff --git a/editor/plugins/texture_region_editor_plugin.h b/editor/plugins/texture_region_editor_plugin.h
index 041742c28a0e..1e1cc2b7b290 100644
--- a/editor/plugins/texture_region_editor_plugin.h
+++ b/editor/plugins/texture_region_editor_plugin.h
@@ -52,23 +52,23 @@ class TextureRegionEditor : public VBoxContainer {
 	};
 
 	friend class TextureRegionEditorPlugin;
-	OptionButton *snap_mode_button;
-	Button *zoom_in;
-	Button *zoom_reset;
-	Button *zoom_out;
-	HBoxContainer *hb_grid; //For showing/hiding the grid controls when changing the SnapMode
-	SpinBox *sb_step_y;
-	SpinBox *sb_step_x;
-	SpinBox *sb_off_y;
-	SpinBox *sb_off_x;
-	SpinBox *sb_sep_y;
-	SpinBox *sb_sep_x;
-	Panel *edit_draw;
+	OptionButton *snap_mode_button = nullptr;
+	Button *zoom_in = nullptr;
+	Button *zoom_reset = nullptr;
+	Button *zoom_out = nullptr;
+	HBoxContainer *hb_grid = nullptr; //For showing/hiding the grid controls when changing the SnapMode
+	SpinBox *sb_step_y = nullptr;
+	SpinBox *sb_step_x = nullptr;
+	SpinBox *sb_off_y = nullptr;
+	SpinBox *sb_off_x = nullptr;
+	SpinBox *sb_sep_y = nullptr;
+	SpinBox *sb_sep_x = nullptr;
+	Panel *edit_draw = nullptr;
 
-	VScrollBar *vscroll;
-	HScrollBar *hscroll;
+	VScrollBar *vscroll = nullptr;
+	HScrollBar *hscroll = nullptr;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	Vector2 draw_ofs;
 	float draw_zoom;
@@ -79,9 +79,9 @@ class TextureRegionEditor : public VBoxContainer {
 	Vector2 snap_step;
 	Vector2 snap_separation;
 
-	Sprite2D *node_sprite_2d;
-	Sprite3D *node_sprite_3d;
-	NinePatchRect *node_ninepatch;
+	Sprite2D *node_sprite_2d = nullptr;
+	Sprite3D *node_sprite_3d = nullptr;
+	NinePatchRect *node_ninepatch = nullptr;
 	Ref<StyleBoxTexture> obj_styleBox;
 	Ref<AtlasTexture> atlas_tex;
 
@@ -146,8 +146,8 @@ class TextureRegionEditorPlugin : public EditorPlugin {
 	GDCLASS(TextureRegionEditorPlugin, EditorPlugin);
 
 	bool manually_hidden;
-	Button *texture_region_button;
-	TextureRegionEditor *region_editor;
+	Button *texture_region_button = nullptr;
+	TextureRegionEditor *region_editor = nullptr;
 
 protected:
 	static void _bind_methods();
diff --git a/editor/plugins/theme_editor_plugin.h b/editor/plugins/theme_editor_plugin.h
index 7c1b0cda3e8e..4b49fbb1864f 100644
--- a/editor/plugins/theme_editor_plugin.h
+++ b/editor/plugins/theme_editor_plugin.h
@@ -75,9 +75,9 @@ class ThemeItemImportTree : public VBoxContainer {
 
 	Map<ThemeItem, ItemCheckedState> selected_items;
 
-	LineEdit *import_items_filter;
+	LineEdit *import_items_filter = nullptr;
 
-	Tree *import_items_tree;
+	Tree *import_items_tree = nullptr;
 	List<TreeItem *> tree_color_items;
 	List<TreeItem *> tree_constant_items;
 	List<TreeItem *> tree_font_items;
@@ -92,57 +92,57 @@ class ThemeItemImportTree : public VBoxContainer {
 		IMPORT_ITEM_DATA = 2,
 	};
 
-	TextureRect *select_colors_icon;
-	Label *select_colors_label;
-	Button *select_all_colors_button;
-	Button *select_full_colors_button;
-	Button *deselect_all_colors_button;
-	Label *total_selected_colors_label;
+	TextureRect *select_colors_icon = nullptr;
+	Label *select_colors_label = nullptr;
+	Button *select_all_colors_button = nullptr;
+	Button *select_full_colors_button = nullptr;
+	Button *deselect_all_colors_button = nullptr;
+	Label *total_selected_colors_label = nullptr;
 
-	TextureRect *select_constants_icon;
-	Label *select_constants_label;
-	Button *select_all_constants_button;
-	Button *select_full_constants_button;
-	Button *deselect_all_constants_button;
-	Label *total_selected_constants_label;
+	TextureRect *select_constants_icon = nullptr;
+	Label *select_constants_label = nullptr;
+	Button *select_all_constants_button = nullptr;
+	Button *select_full_constants_button = nullptr;
+	Button *deselect_all_constants_button = nullptr;
+	Label *total_selected_constants_label = nullptr;
 
-	TextureRect *select_fonts_icon;
-	Label *select_fonts_label;
-	Button *select_all_fonts_button;
-	Button *select_full_fonts_button;
-	Button *deselect_all_fonts_button;
-	Label *total_selected_fonts_label;
+	TextureRect *select_fonts_icon = nullptr;
+	Label *select_fonts_label = nullptr;
+	Button *select_all_fonts_button = nullptr;
+	Button *select_full_fonts_button = nullptr;
+	Button *deselect_all_fonts_button = nullptr;
+	Label *total_selected_fonts_label = nullptr;
 
-	TextureRect *select_font_sizes_icon;
-	Label *select_font_sizes_label;
-	Button *select_all_font_sizes_button;
-	Button *select_full_font_sizes_button;
-	Button *deselect_all_font_sizes_button;
-	Label *total_selected_font_sizes_label;
+	TextureRect *select_font_sizes_icon = nullptr;
+	Label *select_font_sizes_label = nullptr;
+	Button *select_all_font_sizes_button = nullptr;
+	Button *select_full_font_sizes_button = nullptr;
+	Button *deselect_all_font_sizes_button = nullptr;
+	Label *total_selected_font_sizes_label = nullptr;
 
-	TextureRect *select_icons_icon;
-	Label *select_icons_label;
-	Button *select_all_icons_button;
-	Button *select_full_icons_button;
-	Button *deselect_all_icons_button;
-	Label *total_selected_icons_label;
+	TextureRect *select_icons_icon = nullptr;
+	Label *select_icons_label = nullptr;
+	Button *select_all_icons_button = nullptr;
+	Button *select_full_icons_button = nullptr;
+	Button *deselect_all_icons_button = nullptr;
+	Label *total_selected_icons_label = nullptr;
 
-	TextureRect *select_styleboxes_icon;
-	Label *select_styleboxes_label;
-	Button *select_all_styleboxes_button;
-	Button *select_full_styleboxes_button;
-	Button *deselect_all_styleboxes_button;
-	Label *total_selected_styleboxes_label;
+	TextureRect *select_styleboxes_icon = nullptr;
+	Label *select_styleboxes_label = nullptr;
+	Button *select_all_styleboxes_button = nullptr;
+	Button *select_full_styleboxes_button = nullptr;
+	Button *deselect_all_styleboxes_button = nullptr;
+	Label *total_selected_styleboxes_label = nullptr;
 
-	HBoxContainer *select_icons_warning_hb;
-	TextureRect *select_icons_warning_icon;
-	Label *select_icons_warning;
+	HBoxContainer *select_icons_warning_hb = nullptr;
+	TextureRect *select_icons_warning_icon = nullptr;
+	Label *select_icons_warning = nullptr;
 
-	Button *import_collapse_types_button;
-	Button *import_expand_types_button;
-	Button *import_select_all_button;
-	Button *import_select_full_button;
-	Button *import_deselect_all_button;
+	Button *import_collapse_types_button = nullptr;
+	Button *import_expand_types_button = nullptr;
+	Button *import_select_all_button = nullptr;
+	Button *import_select_full_button = nullptr;
+	Button *import_deselect_all_button = nullptr;
 
 	void _update_items_tree();
 	void _toggle_type_items(bool p_collapse);
@@ -186,31 +186,31 @@ class ThemeTypeEditor;
 class ThemeItemEditorDialog : public AcceptDialog {
 	GDCLASS(ThemeItemEditorDialog, AcceptDialog);
 
-	ThemeTypeEditor *theme_type_editor;
+	ThemeTypeEditor *theme_type_editor = nullptr;
 
 	Ref<Theme> edited_theme;
 
-	TabContainer *tc;
+	TabContainer *tc = nullptr;
 
 	enum TypesTreeAction {
 		TYPES_TREE_REMOVE_ITEM,
 	};
 
-	Tree *edit_type_list;
-	LineEdit *edit_add_type_value;
+	Tree *edit_type_list = nullptr;
+	LineEdit *edit_add_type_value = nullptr;
 	String edited_item_type;
 
-	Button *edit_items_add_color;
-	Button *edit_items_add_constant;
-	Button *edit_items_add_font;
-	Button *edit_items_add_font_size;
-	Button *edit_items_add_icon;
-	Button *edit_items_add_stylebox;
-	Button *edit_items_remove_class;
-	Button *edit_items_remove_custom;
-	Button *edit_items_remove_all;
-	Tree *edit_items_tree;
-	Label *edit_items_message;
+	Button *edit_items_add_color = nullptr;
+	Button *edit_items_add_constant = nullptr;
+	Button *edit_items_add_font = nullptr;
+	Button *edit_items_add_font_size = nullptr;
+	Button *edit_items_add_icon = nullptr;
+	Button *edit_items_add_stylebox = nullptr;
+	Button *edit_items_remove_class = nullptr;
+	Button *edit_items_remove_custom = nullptr;
+	Button *edit_items_remove_all = nullptr;
+	Tree *edit_items_tree = nullptr;
+	Label *edit_items_message = nullptr;
 
 	enum ItemsTreeAction {
 		ITEMS_TREE_RENAME_ITEM,
@@ -218,10 +218,10 @@ class ThemeItemEditorDialog : public AcceptDialog {
 		ITEMS_TREE_REMOVE_DATA_TYPE,
 	};
 
-	ConfirmationDialog *edit_theme_item_dialog;
-	VBoxContainer *edit_theme_item_old_vb;
-	Label *theme_item_old_name;
-	LineEdit *theme_item_name;
+	ConfirmationDialog *edit_theme_item_dialog = nullptr;
+	VBoxContainer *edit_theme_item_old_vb = nullptr;
+	Label *theme_item_old_name = nullptr;
+	LineEdit *theme_item_name = nullptr;
 
 	enum ItemPopupMode {
 		CREATE_THEME_ITEM,
@@ -233,15 +233,15 @@ class ThemeItemEditorDialog : public AcceptDialog {
 	String edit_item_old_name;
 	Theme::DataType edit_item_data_type = Theme::DATA_TYPE_MAX;
 
-	ThemeItemImportTree *import_default_theme_items;
-	ThemeItemImportTree *import_editor_theme_items;
-	ThemeItemImportTree *import_other_theme_items;
+	ThemeItemImportTree *import_default_theme_items = nullptr;
+	ThemeItemImportTree *import_editor_theme_items = nullptr;
+	ThemeItemImportTree *import_other_theme_items = nullptr;
 
-	LineEdit *import_another_theme_value;
-	Button *import_another_theme_button;
-	EditorFileDialog *import_another_theme_dialog;
+	LineEdit *import_another_theme_value = nullptr;
+	Button *import_another_theme_button = nullptr;
+	EditorFileDialog *import_another_theme_dialog = nullptr;
 
-	ConfirmationDialog *confirm_closing_dialog;
+	ConfirmationDialog *confirm_closing_dialog = nullptr;
 
 	void ok_pressed() override;
 	void _close_dialog();
@@ -288,9 +288,9 @@ class ThemeTypeDialog : public ConfirmationDialog {
 
 	String pre_submitted_value;
 
-	LineEdit *add_type_filter;
-	ItemList *add_type_options;
-	ConfirmationDialog *add_type_confirmation;
+	LineEdit *add_type_filter = nullptr;
+	ItemList *add_type_options = nullptr;
+	ConfirmationDialog *add_type_confirmation = nullptr;
 
 	void _dialog_about_to_show();
 	void ok_pressed() override;
@@ -332,22 +332,22 @@ class ThemeTypeEditor : public MarginContainer {
 
 	LeadingStylebox leading_stylebox;
 
-	OptionButton *theme_type_list;
-	Button *add_type_button;
+	OptionButton *theme_type_list = nullptr;
+	Button *add_type_button = nullptr;
 
-	CheckButton *show_default_items_button;
+	CheckButton *show_default_items_button = nullptr;
 
-	TabContainer *data_type_tabs;
-	VBoxContainer *color_items_list;
-	VBoxContainer *constant_items_list;
-	VBoxContainer *font_items_list;
-	VBoxContainer *font_size_items_list;
-	VBoxContainer *icon_items_list;
-	VBoxContainer *stylebox_items_list;
+	TabContainer *data_type_tabs = nullptr;
+	VBoxContainer *color_items_list = nullptr;
+	VBoxContainer *constant_items_list = nullptr;
+	VBoxContainer *font_items_list = nullptr;
+	VBoxContainer *font_size_items_list = nullptr;
+	VBoxContainer *icon_items_list = nullptr;
+	VBoxContainer *stylebox_items_list = nullptr;
 
-	LineEdit *type_variation_edit;
-	Button *type_variation_button;
-	Label *type_variation_locked;
+	LineEdit *type_variation_edit = nullptr;
+	Button *type_variation_button = nullptr;
+	Label *type_variation_locked = nullptr;
 
 	enum TypeDialogMode {
 		ADD_THEME_TYPE,
@@ -355,10 +355,10 @@ class ThemeTypeEditor : public MarginContainer {
 	};
 
 	TypeDialogMode add_type_mode = ADD_THEME_TYPE;
-	ThemeTypeDialog *add_type_dialog;
+	ThemeTypeDialog *add_type_dialog = nullptr;
 
 	Vector<Control *> focusables;
-	Timer *update_debounce_timer;
+	Timer *update_debounce_timer = nullptr;
 
 	VBoxContainer *_create_item_list(Theme::DataType p_data_type);
 	void _update_type_list();
@@ -417,15 +417,15 @@ class ThemeEditor : public VBoxContainer {
 
 	Ref<Theme> theme;
 
-	TabBar *preview_tabs;
-	PanelContainer *preview_tabs_content;
-	Button *add_preview_button;
-	EditorFileDialog *preview_scene_dialog;
+	TabBar *preview_tabs = nullptr;
+	PanelContainer *preview_tabs_content = nullptr;
+	Button *add_preview_button = nullptr;
+	EditorFileDialog *preview_scene_dialog = nullptr;
 
-	ThemeTypeEditor *theme_type_editor;
+	ThemeTypeEditor *theme_type_editor = nullptr;
 
-	Label *theme_name;
-	ThemeItemEditorDialog *theme_edit_dialog;
+	Label *theme_name = nullptr;
+	ThemeItemEditorDialog *theme_edit_dialog = nullptr;
 
 	void _theme_save_button_cbk(bool p_save_as);
 	void _theme_edit_button_cbk();
@@ -452,8 +452,8 @@ public:
 class ThemeEditorPlugin : public EditorPlugin {
 	GDCLASS(ThemeEditorPlugin, EditorPlugin);
 
-	ThemeEditor *theme_editor;
-	Button *button;
+	ThemeEditor *theme_editor = nullptr;
+	Button *button = nullptr;
 
 public:
 	virtual String get_name() const override { return "Theme"; }
diff --git a/editor/plugins/theme_editor_preview.h b/editor/plugins/theme_editor_preview.h
index 48111df399c1..d05916afae7d 100644
--- a/editor/plugins/theme_editor_preview.h
+++ b/editor/plugins/theme_editor_preview.h
@@ -41,10 +41,10 @@
 class ThemeEditorPreview : public VBoxContainer {
 	GDCLASS(ThemeEditorPreview, VBoxContainer);
 
-	ScrollContainer *preview_container;
-	ColorRect *preview_bg;
-	MarginContainer *preview_overlay;
-	Control *picker_overlay;
+	ScrollContainer *preview_container = nullptr;
+	ColorRect *preview_bg = nullptr;
+	MarginContainer *preview_overlay = nullptr;
+	Control *picker_overlay = nullptr;
 	Control *hovered_control = nullptr;
 
 	struct ThemeCache {
@@ -69,9 +69,9 @@ class ThemeEditorPreview : public VBoxContainer {
 	void _reset_picker_overlay();
 
 protected:
-	HBoxContainer *preview_toolbar;
-	MarginContainer *preview_content;
-	Button *picker_button;
+	HBoxContainer *preview_toolbar = nullptr;
+	MarginContainer *preview_content = nullptr;
+	Button *picker_button = nullptr;
 
 	void add_preview_overlay(Control *p_overlay);
 
@@ -96,7 +96,7 @@ class SceneThemeEditorPreview : public ThemeEditorPreview {
 
 	Ref<PackedScene> loaded_scene;
 
-	Button *reload_scene_button;
+	Button *reload_scene_button = nullptr;
 
 	void _reload_scene();
 
diff --git a/editor/plugins/tiles/atlas_merging_dialog.h b/editor/plugins/tiles/atlas_merging_dialog.h
index 6cf555247dd9..9502d93f6b79 100644
--- a/editor/plugins/tiles/atlas_merging_dialog.h
+++ b/editor/plugins/tiles/atlas_merging_dialog.h
@@ -49,19 +49,19 @@ private:
 	LocalVector<Map<Vector2i, Vector2i>> merged_mapping;
 	Ref<TileSet> tile_set;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	// Settings.
 	int next_line_after_column = 30;
 
 	// GUI.
-	ItemList *atlas_merging_atlases_list;
-	EditorPropertyVector2i *texture_region_size_editor_property;
-	EditorPropertyInteger *columns_editor_property;
-	TextureRect *preview;
-	Label *select_2_atlases_label;
-	EditorFileDialog *editor_file_dialog;
-	Button *merge_button;
+	ItemList *atlas_merging_atlases_list = nullptr;
+	EditorPropertyVector2i *texture_region_size_editor_property = nullptr;
+	EditorPropertyInteger *columns_editor_property = nullptr;
+	TextureRect *preview = nullptr;
+	Label *select_2_atlases_label = nullptr;
+	EditorFileDialog *editor_file_dialog = nullptr;
+	Button *merge_button = nullptr;
 
 	void _property_changed(const StringName &p_property, const Variant &p_value, const String &p_field, bool p_changing);
 
diff --git a/editor/plugins/tiles/tile_atlas_view.h b/editor/plugins/tiles/tile_atlas_view.h
index caf3ef9e4b3b..6e74858b083b 100644
--- a/editor/plugins/tiles/tile_atlas_view.h
+++ b/editor/plugins/tiles/tile_atlas_view.h
@@ -45,8 +45,8 @@ class TileAtlasView : public Control {
 	GDCLASS(TileAtlasView, Control);
 
 private:
-	TileSet *tile_set;
-	TileSetAtlasSource *tile_set_atlas_source;
+	TileSet *tile_set = nullptr;
+	TileSetAtlasSource *tile_set_atlas_source = nullptr;
 	int source_id = TileSet::INVALID_SOURCE;
 
 	enum DragType {
@@ -55,9 +55,9 @@ private:
 	};
 	DragType drag_type = DRAG_TYPE_NONE;
 	float previous_zoom = 1.0;
-	EditorZoomWidget *zoom_widget;
-	Button *button_center_view;
-	CenterContainer *center_container;
+	EditorZoomWidget *zoom_widget = nullptr;
+	Button *button_center_view = nullptr;
+	CenterContainer *center_container = nullptr;
 	Vector2 panning;
 	void _update_zoom_and_panning(bool p_zoom_on_mouse_pos = false);
 	void _zoom_widget_changed();
@@ -72,41 +72,41 @@ private:
 	Map<Vector2, Map<int, Rect2i>> alternative_tiles_rect_cache;
 	void _update_alternative_tiles_rect_cache();
 
-	MarginContainer *margin_container;
+	MarginContainer *margin_container = nullptr;
 	int margin_container_paddings[4] = { 0, 0, 0, 0 };
-	HBoxContainer *hbox;
-	Label *missing_source_label;
+	HBoxContainer *hbox = nullptr;
+	Label *missing_source_label = nullptr;
 
 	// Background
-	Control *background_left;
+	Control *background_left = nullptr;
 	void _draw_background_left();
-	Control *background_right;
+	Control *background_right = nullptr;
 	void _draw_background_right();
 
 	// Left side.
-	Control *base_tiles_root_control;
+	Control *base_tiles_root_control = nullptr;
 	void _base_tiles_root_control_gui_input(const Ref<InputEvent> &p_event);
 
-	Control *base_tiles_drawing_root;
+	Control *base_tiles_drawing_root = nullptr;
 
-	Control *base_tiles_draw;
+	Control *base_tiles_draw = nullptr;
 	void _draw_base_tiles();
 
-	Control *base_tiles_texture_grid;
+	Control *base_tiles_texture_grid = nullptr;
 	void _draw_base_tiles_texture_grid();
 
-	Control *base_tiles_shape_grid;
+	Control *base_tiles_shape_grid = nullptr;
 	void _draw_base_tiles_shape_grid();
 
 	Size2i _compute_base_tiles_control_size();
 
 	// Right side.
-	Control *alternative_tiles_root_control;
+	Control *alternative_tiles_root_control = nullptr;
 	void _alternative_tiles_root_control_gui_input(const Ref<InputEvent> &p_event);
 
-	Control *alternative_tiles_drawing_root;
+	Control *alternative_tiles_drawing_root = nullptr;
 
-	Control *alternatives_draw;
+	Control *alternatives_draw = nullptr;
 	void _draw_alternatives();
 
 	Size2i _compute_alternative_tiles_control_size();
diff --git a/editor/plugins/tiles/tile_data_editors.h b/editor/plugins/tiles/tile_data_editors.h
index 99724760a7dc..3ac9eacb0566 100644
--- a/editor/plugins/tiles/tile_data_editors.h
+++ b/editor/plugins/tiles/tile_data_editors.h
@@ -93,7 +93,7 @@ private:
 	bool multiple_polygon_mode = false;
 
 	bool use_undo_redo = true;
-	UndoRedo *editor_undo_redo;
+	UndoRedo *editor_undo_redo = nullptr;
 
 	// UI
 	int hovered_polygon_index = -1;
@@ -113,20 +113,20 @@ private:
 	Vector2 drag_last_pos;
 	PackedVector2Array drag_old_polygon;
 
-	HBoxContainer *toolbar;
+	HBoxContainer *toolbar = nullptr;
 	Ref<ButtonGroup> tools_button_group;
-	Button *button_create;
-	Button *button_edit;
-	Button *button_delete;
-	Button *button_pixel_snap;
-	MenuButton *button_advanced_menu;
+	Button *button_create = nullptr;
+	Button *button_edit = nullptr;
+	Button *button_delete = nullptr;
+	Button *button_pixel_snap = nullptr;
+	MenuButton *button_advanced_menu = nullptr;
 
 	Vector<Point2> in_creation_polygon;
 
-	Panel *panel;
-	Control *base_control;
-	EditorZoomWidget *editor_zoom_widget;
-	Button *button_center_view;
+	Panel *panel = nullptr;
+	Control *base_control = nullptr;
+	EditorZoomWidget *editor_zoom_widget = nullptr;
+	Button *button_center_view = nullptr;
 	Vector2 panning;
 
 	Ref<Texture2D> background_texture;
@@ -188,12 +188,12 @@ class TileDataDefaultEditor : public TileDataEditor {
 private:
 	// Toolbar
 	HBoxContainer *toolbar = memnew(HBoxContainer);
-	Button *picker_button;
+	Button *picker_button = nullptr;
 
 	// UI
 	Ref<Texture2D> tile_bool_checked;
 	Ref<Texture2D> tile_bool_unchecked;
-	Label *label;
+	Label *label = nullptr;
 
 	EditorProperty *property_editor = nullptr;
 
@@ -214,7 +214,7 @@ private:
 protected:
 	DummyObject *dummy_object = memnew(DummyObject);
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	StringName type;
 	String property;
@@ -268,7 +268,7 @@ private:
 	int occlusion_layer = -1;
 
 	// UI
-	GenericTilePolygonEditor *polygon_editor;
+	GenericTilePolygonEditor *polygon_editor = nullptr;
 
 	void _polygon_changed(PackedVector2Array p_polygon);
 
@@ -279,7 +279,7 @@ private:
 	virtual void _setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, Map<TileMapCell, Variant> p_previous_values, Variant p_new_value) override;
 
 protected:
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	virtual void _tile_set_changed() override;
 
@@ -299,7 +299,7 @@ class TileDataCollisionEditor : public TileDataDefaultEditor {
 	int physics_layer = -1;
 
 	// UI
-	GenericTilePolygonEditor *polygon_editor;
+	GenericTilePolygonEditor *polygon_editor = nullptr;
 	DummyObject *dummy_object = memnew(DummyObject);
 	Map<StringName, EditorProperty *> property_editors;
 
@@ -314,7 +314,7 @@ class TileDataCollisionEditor : public TileDataDefaultEditor {
 	virtual void _setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, Map<TileMapCell, Variant> p_previous_values, Variant p_new_value) override;
 
 protected:
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	virtual void _tile_set_changed() override;
 
@@ -335,7 +335,7 @@ class TileDataTerrainsEditor : public TileDataEditor {
 private:
 	// Toolbar
 	HBoxContainer *toolbar = memnew(HBoxContainer);
-	Button *picker_button;
+	Button *picker_button = nullptr;
 
 	// Painting state.
 	enum DragType {
@@ -352,7 +352,7 @@ private:
 	Variant drag_painted_value;
 
 	// UI
-	Label *label;
+	Label *label = nullptr;
 	DummyObject *dummy_object = memnew(DummyObject);
 	EditorPropertyEnum *terrain_set_property_editor = nullptr;
 	EditorPropertyEnum *terrain_property_editor = nullptr;
@@ -366,7 +366,7 @@ protected:
 
 	void _notification(int p_what);
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 public:
 	virtual Control *get_toolbar() override { return toolbar; };
@@ -388,7 +388,7 @@ private:
 	PackedVector2Array navigation_polygon;
 
 	// UI
-	GenericTilePolygonEditor *polygon_editor;
+	GenericTilePolygonEditor *polygon_editor = nullptr;
 
 	void _polygon_changed(PackedVector2Array p_polygon);
 
@@ -399,7 +399,7 @@ private:
 	virtual void _setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, Map<TileMapCell, Variant> p_previous_values, Variant p_new_value) override;
 
 protected:
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	virtual void _tile_set_changed() override;
 
diff --git a/editor/plugins/tiles/tile_map_editor.h b/editor/plugins/tiles/tile_map_editor.h
index d09061015faa..3a0293f48fdc 100644
--- a/editor/plugins/tiles/tile_map_editor.h
+++ b/editor/plugins/tiles/tile_map_editor.h
@@ -51,8 +51,8 @@ class UndoRedo;
 class TileMapEditorPlugin : public Object {
 public:
 	struct TabData {
-		Control *toolbar;
-		Control *panel;
+		Control *toolbar = nullptr;
+		Control *panel = nullptr;
 	};
 
 	virtual Vector<TabData> get_tabs() const {
@@ -69,33 +69,33 @@ class TileMapEditorTilesPlugin : public TileMapEditorPlugin {
 	GDCLASS(TileMapEditorTilesPlugin, TileMapEditorPlugin);
 
 private:
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 	ObjectID tile_map_id;
 	int tile_map_layer = -1;
 	virtual void edit(ObjectID p_tile_map_id, int p_tile_map_layer) override;
 
 	///// Toolbar /////
-	HBoxContainer *toolbar;
+	HBoxContainer *toolbar = nullptr;
 
 	Ref<ButtonGroup> tool_buttons_group;
-	Button *select_tool_button;
-	Button *paint_tool_button;
-	Button *line_tool_button;
-	Button *rect_tool_button;
-	Button *bucket_tool_button;
+	Button *select_tool_button = nullptr;
+	Button *paint_tool_button = nullptr;
+	Button *line_tool_button = nullptr;
+	Button *rect_tool_button = nullptr;
+	Button *bucket_tool_button = nullptr;
 
-	HBoxContainer *tools_settings;
+	HBoxContainer *tools_settings = nullptr;
 
-	VSeparator *tools_settings_vsep;
-	Button *picker_button;
-	Button *erase_button;
+	VSeparator *tools_settings_vsep = nullptr;
+	Button *picker_button = nullptr;
+	Button *erase_button = nullptr;
 
-	VSeparator *tools_settings_vsep_2;
-	CheckBox *bucket_contiguous_checkbox;
-	CheckBox *random_tile_checkbox;
+	VSeparator *tools_settings_vsep_2 = nullptr;
+	CheckBox *bucket_contiguous_checkbox = nullptr;
+	CheckBox *random_tile_checkbox = nullptr;
 	float scattering = 0.0;
-	Label *scatter_label;
-	SpinBox *scatter_spinbox;
+	Label *scatter_label = nullptr;
+	SpinBox *scatter_spinbox = nullptr;
 	void _on_random_tile_checkbox_toggled(bool p_pressed);
 	void _on_scattering_spinbox_changed(double p_value);
 
@@ -148,12 +148,12 @@ private:
 	void _tab_changed();
 
 	///// Bottom panel tiles ////
-	VBoxContainer *tiles_bottom_panel;
-	Label *missing_source_label;
-	Label *invalid_source_label;
+	VBoxContainer *tiles_bottom_panel = nullptr;
+	Label *missing_source_label = nullptr;
+	Label *invalid_source_label = nullptr;
 
-	ItemList *sources_list;
-	MenuButton *source_sort_button;
+	ItemList *sources_list = nullptr;
+	MenuButton *source_sort_button = nullptr;
 
 	Ref<Texture2D> missing_atlas_texture_icon;
 	void _update_tile_set_sources_list();
@@ -162,18 +162,18 @@ private:
 
 	// Atlas sources.
 	TileMapCell hovered_tile;
-	TileAtlasView *tile_atlas_view;
-	HSplitContainer *atlas_sources_split_container;
+	TileAtlasView *tile_atlas_view = nullptr;
+	HSplitContainer *atlas_sources_split_container = nullptr;
 
 	bool tile_set_dragging_selection = false;
 	Vector2i tile_set_drag_start_mouse_pos;
 
-	Control *tile_atlas_control;
+	Control *tile_atlas_control = nullptr;
 	void _tile_atlas_control_mouse_exited();
 	void _tile_atlas_control_gui_input(const Ref<InputEvent> &p_event);
 	void _tile_atlas_control_draw();
 
-	Control *alternative_tiles_control;
+	Control *alternative_tiles_control = nullptr;
 	void _tile_alternatives_control_draw();
 	void _tile_alternatives_control_mouse_exited();
 	void _tile_alternatives_control_gui_input(const Ref<InputEvent> &p_event);
@@ -182,7 +182,7 @@ private:
 	void _set_source_sort(int p_sort);
 
 	// Scenes collection sources.
-	ItemList *scene_tiles_list;
+	ItemList *scene_tiles_list = nullptr;
 
 	void _update_scenes_collection_view();
 	void _scene_thumbnail_done(const String &p_path, const Ref<Texture2D> &p_preview, const Ref<Texture2D> &p_small_preview, Variant p_ud);
@@ -190,9 +190,9 @@ private:
 	void _scenes_list_nothing_selected();
 
 	///// Bottom panel patterns ////
-	VBoxContainer *patterns_bottom_panel;
-	ItemList *patterns_item_list;
-	Label *patterns_help_label;
+	VBoxContainer *patterns_bottom_panel = nullptr;
+	ItemList *patterns_item_list = nullptr;
+	Label *patterns_help_label = nullptr;
 	void _patterns_item_list_gui_input(const Ref<InputEvent> &p_event);
 	void _pattern_preview_done(Ref<TileMapPattern> p_pattern, Ref<Texture2D> p_texture);
 	bool select_last_pattern = false;
@@ -220,32 +220,32 @@ class TileMapEditorTerrainsPlugin : public TileMapEditorPlugin {
 	GDCLASS(TileMapEditorTerrainsPlugin, TileMapEditorPlugin);
 
 private:
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 	ObjectID tile_map_id;
 	int tile_map_layer = -1;
 	virtual void edit(ObjectID p_tile_map_id, int p_tile_map_layer) override;
 
 	// Toolbar.
-	HBoxContainer *toolbar;
+	HBoxContainer *toolbar = nullptr;
 
 	Ref<ButtonGroup> tool_buttons_group;
-	Button *paint_tool_button;
-	Button *line_tool_button;
-	Button *rect_tool_button;
-	Button *bucket_tool_button;
+	Button *paint_tool_button = nullptr;
+	Button *line_tool_button = nullptr;
+	Button *rect_tool_button = nullptr;
+	Button *bucket_tool_button = nullptr;
 
-	HBoxContainer *tools_settings;
+	HBoxContainer *tools_settings = nullptr;
 
-	VSeparator *tools_settings_vsep;
-	Button *picker_button;
-	Button *erase_button;
+	VSeparator *tools_settings_vsep = nullptr;
+	Button *picker_button = nullptr;
+	Button *erase_button = nullptr;
 
-	VSeparator *tools_settings_vsep_2;
-	CheckBox *bucket_contiguous_checkbox;
+	VSeparator *tools_settings_vsep_2 = nullptr;
+	CheckBox *bucket_contiguous_checkbox = nullptr;
 	void _update_toolbar();
 
 	// Main vbox.
-	VBoxContainer *main_vbox_container;
+	VBoxContainer *main_vbox_container = nullptr;
 
 	// TileMap editing.
 	bool has_mouse = false;
@@ -278,8 +278,8 @@ private:
 	void _update_selection();
 
 	// Bottom panel.
-	Tree *terrains_tree;
-	ItemList *terrains_tile_list;
+	Tree *terrains_tree = nullptr;
+	ItemList *terrains_tile_list = nullptr;
 
 	// Cache.
 	LocalVector<LocalVector<Set<TileSet::TerrainsPattern>>> per_terrain_terrains_patterns;
@@ -306,7 +306,7 @@ class TileMapEditor : public VBoxContainer {
 	GDCLASS(TileMapEditor, VBoxContainer);
 
 private:
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 	bool tileset_changed_needs_update = false;
 	ObjectID tile_map_id;
 	int tile_map_layer = -1;
@@ -315,24 +315,24 @@ private:
 	Vector<TileMapEditorPlugin *> tile_map_editor_plugins;
 
 	// Toolbar.
-	HBoxContainer *tile_map_toolbar;
+	HBoxContainer *tile_map_toolbar = nullptr;
 
-	PopupMenu *layers_selection_popup;
-	Button *layers_selection_button;
-	Button *toogle_highlight_selected_layer_button;
+	PopupMenu *layers_selection_popup = nullptr;
+	Button *layers_selection_button = nullptr;
+	Button *toogle_highlight_selected_layer_button = nullptr;
 	void _layers_selection_button_draw();
 	void _layers_selection_button_pressed();
 	void _layers_selection_id_pressed(int p_id);
 
-	Button *toggle_grid_button;
+	Button *toggle_grid_button = nullptr;
 	void _on_grid_toggled(bool p_pressed);
 
-	MenuButton *advanced_menu_button;
+	MenuButton *advanced_menu_button = nullptr;
 	void _advanced_menu_button_id_pressed(int p_id);
 
 	// Bottom panel.
-	Label *missing_tileset_label;
-	TabBar *tabs_bar;
+	Label *missing_tileset_label = nullptr;
+	TabBar *tabs_bar = nullptr;
 	LocalVector<TileMapEditorPlugin::TabData> tabs_data;
 	LocalVector<TileMapEditorPlugin *> tabs_plugins;
 	void _update_bottom_panel();
diff --git a/editor/plugins/tiles/tile_proxies_manager_dialog.h b/editor/plugins/tiles/tile_proxies_manager_dialog.h
index 3f1461391ebd..00866544bea5 100644
--- a/editor/plugins/tiles/tile_proxies_manager_dialog.h
+++ b/editor/plugins/tiles/tile_proxies_manager_dialog.h
@@ -43,24 +43,24 @@ private:
 	int commited_actions_count = 0;
 	Ref<TileSet> tile_set;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	TileMapCell from;
 	TileMapCell to;
 
 	// GUI
-	ItemList *source_level_list;
-	ItemList *coords_level_list;
-	ItemList *alternative_level_list;
+	ItemList *source_level_list = nullptr;
+	ItemList *coords_level_list = nullptr;
+	ItemList *alternative_level_list = nullptr;
 
-	EditorPropertyInteger *source_from_property_editor;
-	EditorPropertyVector2i *coords_from_property_editor;
-	EditorPropertyInteger *alternative_from_property_editor;
-	EditorPropertyInteger *source_to_property_editor;
-	EditorPropertyVector2i *coords_to_property_editor;
-	EditorPropertyInteger *alternative_to_property_editor;
+	EditorPropertyInteger *source_from_property_editor = nullptr;
+	EditorPropertyVector2i *coords_from_property_editor = nullptr;
+	EditorPropertyInteger *alternative_from_property_editor = nullptr;
+	EditorPropertyInteger *source_to_property_editor = nullptr;
+	EditorPropertyVector2i *coords_to_property_editor = nullptr;
+	EditorPropertyInteger *alternative_to_property_editor = nullptr;
 
-	PopupMenu *popup_menu;
+	PopupMenu *popup_menu = nullptr;
 	void _right_clicked(int p_item, Vector2 p_local_mouse_pos, Object *p_item_list);
 	void _menu_id_pressed(int p_id);
 	void _delete_selected_bindings();
diff --git a/editor/plugins/tiles/tile_set_atlas_source_editor.h b/editor/plugins/tiles/tile_set_atlas_source_editor.h
index 4a90b821f8b6..b26b7edbfae2 100644
--- a/editor/plugins/tiles/tile_set_atlas_source_editor.h
+++ b/editor/plugins/tiles/tile_set_atlas_source_editor.h
@@ -85,7 +85,7 @@ public:
 		GDCLASS(AtlasTileProxyObject, Object);
 
 	private:
-		TileSetAtlasSourceEditor *tiles_set_atlas_source_editor;
+		TileSetAtlasSourceEditor *tiles_set_atlas_source_editor = nullptr;
 
 		TileSetAtlasSource *tile_set_atlas_source = nullptr;
 		Set<TileSelection> tiles = Set<TileSelection>();
@@ -114,16 +114,16 @@ private:
 	TileSetAtlasSource *tile_set_atlas_source = nullptr;
 	int tile_set_atlas_source_id = TileSet::INVALID_SOURCE;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	bool tile_set_changed_needs_update = false;
 
 	// -- Properties painting --
-	VBoxContainer *tile_data_painting_editor_container;
-	Label *tile_data_editors_label;
-	Button *tile_data_editor_dropdown_button;
-	Popup *tile_data_editors_popup;
-	Tree *tile_data_editors_tree;
+	VBoxContainer *tile_data_painting_editor_container = nullptr;
+	Label *tile_data_editors_label = nullptr;
+	Button *tile_data_editor_dropdown_button = nullptr;
+	Popup *tile_data_editors_popup = nullptr;
+	Tree *tile_data_editors_tree = nullptr;
 	void _tile_data_editor_dropdown_button_draw();
 	void _tile_data_editor_dropdown_button_pressed();
 
@@ -135,21 +135,21 @@ private:
 	void _tile_data_editors_tree_selected();
 
 	// -- Inspector --
-	AtlasTileProxyObject *tile_proxy_object;
-	Label *tile_inspector_label;
-	EditorInspector *tile_inspector;
-	Label *tile_inspector_no_tile_selected_label;
+	AtlasTileProxyObject *tile_proxy_object = nullptr;
+	Label *tile_inspector_label = nullptr;
+	EditorInspector *tile_inspector = nullptr;
+	Label *tile_inspector_no_tile_selected_label = nullptr;
 	String selected_property;
 	void _inspector_property_selected(String p_property);
 
-	TileSetAtlasSourceProxyObject *atlas_source_proxy_object;
-	Label *atlas_source_inspector_label;
-	EditorInspector *atlas_source_inspector;
+	TileSetAtlasSourceProxyObject *atlas_source_proxy_object = nullptr;
+	Label *atlas_source_inspector_label = nullptr;
+	EditorInspector *atlas_source_inspector = nullptr;
 
 	// -- Atlas view --
-	HBoxContainer *toolbox;
-	Label *tile_atlas_view_missing_source_label;
-	TileAtlasView *tile_atlas_view;
+	HBoxContainer *toolbox = nullptr;
+	Label *tile_atlas_view_missing_source_label = nullptr;
+	TileAtlasView *tile_atlas_view = nullptr;
 
 	// Dragging
 	enum DragType {
@@ -202,17 +202,17 @@ private:
 
 	// Tool buttons.
 	Ref<ButtonGroup> tools_button_group;
-	Button *tool_setup_atlas_source_button;
-	Button *tool_select_button;
-	Button *tool_paint_button;
-	Label *tool_tile_id_label;
+	Button *tool_setup_atlas_source_button = nullptr;
+	Button *tool_select_button = nullptr;
+	Button *tool_paint_button = nullptr;
+	Label *tool_tile_id_label = nullptr;
 
 	// Tool settings.
-	HBoxContainer *tool_settings;
-	VSeparator *tool_settings_vsep;
-	HBoxContainer *tool_settings_tile_data_toolbar_container;
-	Button *tools_settings_erase_button;
-	MenuButton *tool_advanced_menu_buttom;
+	HBoxContainer *tool_settings = nullptr;
+	VSeparator *tool_settings_vsep = nullptr;
+	HBoxContainer *tool_settings_tile_data_toolbar_container = nullptr;
+	Button *tools_settings_erase_button = nullptr;
+	MenuButton *tool_advanced_menu_buttom = nullptr;
 
 	// Selection.
 	Set<TileSelection> selection;
@@ -223,12 +223,12 @@ private:
 	// A control on the tile atlas to draw and handle input events.
 	Vector2i hovered_base_tile_coords = TileSetSource::INVALID_ATLAS_COORDS;
 
-	PopupMenu *base_tile_popup_menu;
-	PopupMenu *empty_base_tile_popup_menu;
+	PopupMenu *base_tile_popup_menu = nullptr;
+	PopupMenu *empty_base_tile_popup_menu = nullptr;
 	Ref<Texture2D> resize_handle;
 	Ref<Texture2D> resize_handle_disabled;
-	Control *tile_atlas_control;
-	Control *tile_atlas_control_unscaled;
+	Control *tile_atlas_control = nullptr;
+	Control *tile_atlas_control_unscaled = nullptr;
 	void _tile_atlas_control_draw();
 	void _tile_atlas_control_unscaled_draw();
 	void _tile_atlas_control_mouse_exited();
@@ -238,9 +238,9 @@ private:
 	// A control over the alternative tiles.
 	Vector3i hovered_alternative_tile_coords = Vector3i(TileSetSource::INVALID_ATLAS_COORDS.x, TileSetSource::INVALID_ATLAS_COORDS.y, TileSetSource::INVALID_TILE_ALTERNATIVE);
 
-	PopupMenu *alternative_tile_popup_menu;
-	Control *alternative_tiles_control;
-	Control *alternative_tiles_control_unscaled;
+	PopupMenu *alternative_tile_popup_menu = nullptr;
+	Control *alternative_tiles_control = nullptr;
+	Control *alternative_tiles_control_unscaled = nullptr;
 	void _tile_alternatives_control_draw();
 	void _tile_alternatives_control_unscaled_draw();
 	void _tile_alternatives_control_mouse_exited();
@@ -264,7 +264,7 @@ private:
 	// -- Misc --
 	void _auto_create_tiles();
 	void _auto_remove_tiles();
-	AcceptDialog *confirm_auto_create_tiles;
+	AcceptDialog *confirm_auto_create_tiles = nullptr;
 
 	void _tile_set_changed();
 	void _tile_proxy_object_changed(String p_what);
@@ -293,7 +293,7 @@ class EditorPropertyTilePolygon : public EditorProperty {
 
 	void _add_focusable_children(Node *p_node);
 
-	GenericTilePolygonEditor *generic_tile_polygon_editor;
+	GenericTilePolygonEditor *generic_tile_polygon_editor = nullptr;
 	void _polygons_changed();
 
 public:
diff --git a/editor/plugins/tiles/tile_set_editor.h b/editor/plugins/tiles/tile_set_editor.h
index b79b37cf2e67..e633de37b07e 100644
--- a/editor/plugins/tiles/tile_set_editor.h
+++ b/editor/plugins/tiles/tile_set_editor.h
@@ -47,18 +47,18 @@ class TileSetEditor : public VBoxContainer {
 private:
 	Ref<TileSet> tile_set;
 	bool tile_set_changed_needs_update = false;
-	HSplitContainer *split_container;
+	HSplitContainer *split_container = nullptr;
 
 	// TabBar.
-	HBoxContainer *tile_set_toolbar;
-	TabBar *tabs_bar;
+	HBoxContainer *tile_set_toolbar = nullptr;
+	TabBar *tabs_bar = nullptr;
 
 	// Tiles.
-	Label *no_source_selected_label;
-	TileSetAtlasSourceEditor *tile_set_atlas_source_editor;
-	TileSetScenesCollectionSourceEditor *tile_set_scenes_collection_source_editor;
+	Label *no_source_selected_label = nullptr;
+	TileSetAtlasSourceEditor *tile_set_atlas_source_editor = nullptr;
+	TileSetScenesCollectionSourceEditor *tile_set_scenes_collection_source_editor = nullptr;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	void _drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from);
 	bool _can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const;
@@ -66,11 +66,11 @@ private:
 	void _update_sources_list(int force_selected_id = -1);
 
 	// Sources management.
-	Button *sources_delete_button;
-	MenuButton *sources_add_button;
-	MenuButton *source_sort_button;
-	MenuButton *sources_advanced_menu_button;
-	ItemList *sources_list;
+	Button *sources_delete_button = nullptr;
+	MenuButton *sources_add_button = nullptr;
+	MenuButton *source_sort_button = nullptr;
+	MenuButton *sources_advanced_menu_button = nullptr;
+	ItemList *sources_list = nullptr;
 	Ref<Texture2D> missing_texture_texture;
 	void _source_selected(int p_source_index);
 	void _source_delete_pressed();
@@ -78,12 +78,12 @@ private:
 	void _sources_advanced_menu_id_pressed(int p_id_pressed);
 	void _set_source_sort(int p_sort);
 
-	AtlasMergingDialog *atlas_merging_dialog;
-	TileProxiesManagerDialog *tile_proxies_manager_dialog;
+	AtlasMergingDialog *atlas_merging_dialog = nullptr;
+	TileProxiesManagerDialog *tile_proxies_manager_dialog = nullptr;
 
 	// Patterns.
-	ItemList *patterns_item_list;
-	Label *patterns_help_label;
+	ItemList *patterns_item_list = nullptr;
+	Label *patterns_help_label = nullptr;
 	void _patterns_item_list_gui_input(const Ref<InputEvent> &p_event);
 	void _pattern_preview_done(Ref<TileMapPattern> p_pattern, Ref<Texture2D> p_texture);
 	bool select_last_pattern = false;
diff --git a/editor/plugins/tiles/tile_set_scenes_collection_source_editor.h b/editor/plugins/tiles/tile_set_scenes_collection_source_editor.h
index 8904e8524ac4..657bfca032c7 100644
--- a/editor/plugins/tiles/tile_set_scenes_collection_source_editor.h
+++ b/editor/plugins/tiles/tile_set_scenes_collection_source_editor.h
@@ -70,7 +70,7 @@ private:
 		GDCLASS(SceneTileProxyObject, Object);
 
 	private:
-		TileSetScenesCollectionSourceEditor *tile_set_scenes_collection_source_editor;
+		TileSetScenesCollectionSourceEditor *tile_set_scenes_collection_source_editor = nullptr;
 
 		TileSetScenesCollectionSource *tile_set_scenes_collection_source = nullptr;
 		int source_id;
@@ -97,23 +97,23 @@ private:
 	TileSetScenesCollectionSource *tile_set_scenes_collection_source = nullptr;
 	int tile_set_source_id = -1;
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	bool tile_set_scenes_collection_source_changed_needs_update = false;
 
 	// Source inspector.
-	TileSetScenesCollectionProxyObject *scenes_collection_source_proxy_object;
-	Label *scenes_collection_source_inspector_label;
-	EditorInspector *scenes_collection_source_inspector;
+	TileSetScenesCollectionProxyObject *scenes_collection_source_proxy_object = nullptr;
+	Label *scenes_collection_source_inspector_label = nullptr;
+	EditorInspector *scenes_collection_source_inspector = nullptr;
 
 	// Tile inspector.
-	SceneTileProxyObject *tile_proxy_object;
-	Label *tile_inspector_label;
-	EditorInspector *tile_inspector;
+	SceneTileProxyObject *tile_proxy_object = nullptr;
+	Label *tile_inspector_label = nullptr;
+	EditorInspector *tile_inspector = nullptr;
 
-	ItemList *scene_tiles_list;
-	Button *scene_tile_add_button;
-	Button *scene_tile_delete_button;
+	ItemList *scene_tiles_list = nullptr;
+	Button *scene_tile_add_button = nullptr;
+	Button *scene_tile_delete_button = nullptr;
 
 	void _tile_set_scenes_collection_source_changed();
 	void _scenes_collection_source_proxy_object_changed(String p_what);
diff --git a/editor/plugins/tiles/tiles_editor_plugin.h b/editor/plugins/tiles/tiles_editor_plugin.h
index eeff4da4e940..a22e782b34c6 100644
--- a/editor/plugins/tiles/tiles_editor_plugin.h
+++ b/editor/plugins/tiles/tiles_editor_plugin.h
@@ -57,11 +57,11 @@ private:
 	ObjectID tile_map_id;
 	Ref<TileSet> tile_set;
 
-	Button *tilemap_editor_button;
-	TileMapEditor *tilemap_editor;
+	Button *tilemap_editor_button = nullptr;
+	TileMapEditor *tilemap_editor = nullptr;
 
-	Button *tileset_editor_button;
-	TileSetEditor *tileset_editor;
+	Button *tileset_editor_button = nullptr;
+	TileSetEditor *tileset_editor = nullptr;
 
 	void _update_editors();
 
diff --git a/editor/plugins/version_control_editor_plugin.h b/editor/plugins/version_control_editor_plugin.h
index 956c5a334f86..39a56de772f8 100644
--- a/editor/plugins/version_control_editor_plugin.h
+++ b/editor/plugins/version_control_editor_plugin.h
@@ -57,48 +57,48 @@ private:
 	int staged_files_count;
 	List<StringName> available_addons;
 
-	PopupMenu *version_control_actions;
-	ConfirmationDialog *metadata_dialog;
-	OptionButton *metadata_selection;
-	AcceptDialog *set_up_dialog;
-	VBoxContainer *set_up_vbc;
-	HBoxContainer *set_up_hbc;
-	Label *set_up_vcs_label;
-	OptionButton *set_up_choice;
-	PanelContainer *set_up_init_settings;
-	Button *set_up_init_button;
-	RichTextLabel *set_up_vcs_status;
-	Button *set_up_ok_button;
+	PopupMenu *version_control_actions = nullptr;
+	ConfirmationDialog *metadata_dialog = nullptr;
+	OptionButton *metadata_selection = nullptr;
+	AcceptDialog *set_up_dialog = nullptr;
+	VBoxContainer *set_up_vbc = nullptr;
+	HBoxContainer *set_up_hbc = nullptr;
+	Label *set_up_vcs_label = nullptr;
+	OptionButton *set_up_choice = nullptr;
+	PanelContainer *set_up_init_settings = nullptr;
+	Button *set_up_init_button = nullptr;
+	RichTextLabel *set_up_vcs_status = nullptr;
+	Button *set_up_ok_button = nullptr;
 
 	HashMap<ChangeType, String> change_type_to_strings;
 	HashMap<ChangeType, Color> change_type_to_color;
 
-	VBoxContainer *version_commit_dock;
-	VBoxContainer *commit_box_vbc;
-	HSplitContainer *stage_tools;
-	Tree *stage_files;
-	TreeItem *new_files;
-	TreeItem *modified_files;
-	TreeItem *renamed_files;
-	TreeItem *deleted_files;
-	TreeItem *typechange_files;
-	Label *staging_area_label;
-	HSplitContainer *stage_buttons;
-	Button *stage_all_button;
-	Button *stage_selected_button;
-	Button *refresh_button;
-	TextEdit *commit_message;
-	Button *commit_button;
-	Label *commit_status;
+	VBoxContainer *version_commit_dock = nullptr;
+	VBoxContainer *commit_box_vbc = nullptr;
+	HSplitContainer *stage_tools = nullptr;
+	Tree *stage_files = nullptr;
+	TreeItem *new_files = nullptr;
+	TreeItem *modified_files = nullptr;
+	TreeItem *renamed_files = nullptr;
+	TreeItem *deleted_files = nullptr;
+	TreeItem *typechange_files = nullptr;
+	Label *staging_area_label = nullptr;
+	HSplitContainer *stage_buttons = nullptr;
+	Button *stage_all_button = nullptr;
+	Button *stage_selected_button = nullptr;
+	Button *refresh_button = nullptr;
+	TextEdit *commit_message = nullptr;
+	Button *commit_button = nullptr;
+	Label *commit_status = nullptr;
 
-	PanelContainer *version_control_dock;
-	Button *version_control_dock_button;
-	VBoxContainer *diff_vbc;
-	HBoxContainer *diff_hbc;
-	Button *diff_refresh_button;
-	Label *diff_file_name;
-	Label *diff_heading;
-	RichTextLabel *diff;
+	PanelContainer *version_control_dock = nullptr;
+	Button *version_control_dock_button = nullptr;
+	VBoxContainer *diff_vbc = nullptr;
+	HBoxContainer *diff_hbc = nullptr;
+	Button *diff_refresh_button = nullptr;
+	Label *diff_file_name = nullptr;
+	Label *diff_heading = nullptr;
+	RichTextLabel *diff = nullptr;
 
 	void _populate_available_vcs_names();
 	void _create_vcs_metadata_files();
diff --git a/editor/plugins/voxel_gi_editor_plugin.h b/editor/plugins/voxel_gi_editor_plugin.h
index 67bd1d5105de..621e98beef66 100644
--- a/editor/plugins/voxel_gi_editor_plugin.h
+++ b/editor/plugins/voxel_gi_editor_plugin.h
@@ -41,12 +41,12 @@ struct EditorProgress;
 class VoxelGIEditorPlugin : public EditorPlugin {
 	GDCLASS(VoxelGIEditorPlugin, EditorPlugin);
 
-	VoxelGI *voxel_gi;
+	VoxelGI *voxel_gi = nullptr;
 
-	HBoxContainer *bake_hb;
-	Button *bake;
+	HBoxContainer *bake_hb = nullptr;
+	Button *bake = nullptr;
 
-	EditorFileDialog *probe_file;
+	EditorFileDialog *probe_file = nullptr;
 
 	static EditorProgress *tmp_progress;
 	static void bake_func_begin(int p_steps);
diff --git a/editor/progress_dialog.h b/editor/progress_dialog.h
index 880e6bc9d489..f3957501652a 100644
--- a/editor/progress_dialog.h
+++ b/editor/progress_dialog.h
@@ -74,11 +74,11 @@ class ProgressDialog : public PopupPanel {
 		ProgressBar *progress = nullptr;
 		Label *state = nullptr;
 	};
-	HBoxContainer *cancel_hb;
-	Button *cancel;
+	HBoxContainer *cancel_hb = nullptr;
+	Button *cancel = nullptr;
 
 	Map<String, Task> tasks;
-	VBoxContainer *main;
+	VBoxContainer *main = nullptr;
 	uint64_t last_progress_tick;
 
 	static ProgressDialog *singleton;
diff --git a/editor/project_export.h b/editor/project_export.h
index 057fd3116841..4d1719d6eb92 100644
--- a/editor/project_export.h
+++ b/editor/project_export.h
@@ -58,46 +58,46 @@ class ProjectExportDialog : public ConfirmationDialog {
 	GDCLASS(ProjectExportDialog, ConfirmationDialog);
 
 private:
-	TabContainer *sections;
+	TabContainer *sections = nullptr;
 
-	MenuButton *add_preset;
-	Button *duplicate_preset;
-	Button *delete_preset;
-	ItemList *presets;
+	MenuButton *add_preset = nullptr;
+	Button *duplicate_preset = nullptr;
+	Button *delete_preset = nullptr;
+	ItemList *presets = nullptr;
 
-	LineEdit *name;
-	EditorPropertyPath *export_path;
-	EditorInspector *parameters;
-	CheckButton *runnable;
+	LineEdit *name = nullptr;
+	EditorPropertyPath *export_path = nullptr;
+	EditorInspector *parameters = nullptr;
+	CheckButton *runnable = nullptr;
 
-	Button *button_export;
+	Button *button_export = nullptr;
 	bool updating = false;
 
-	AcceptDialog *error_dialog;
-	ConfirmationDialog *delete_confirm;
+	AcceptDialog *error_dialog = nullptr;
+	ConfirmationDialog *delete_confirm = nullptr;
 
-	OptionButton *export_filter;
-	LineEdit *include_filters;
-	LineEdit *exclude_filters;
-	Tree *include_files;
+	OptionButton *export_filter = nullptr;
+	LineEdit *include_filters = nullptr;
+	LineEdit *exclude_filters = nullptr;
+	Tree *include_files = nullptr;
 
-	Label *include_label;
-	MarginContainer *include_margin;
+	Label *include_label = nullptr;
+	MarginContainer *include_margin = nullptr;
 
-	Button *export_button;
-	Button *export_all_button;
-	AcceptDialog *export_all_dialog;
+	Button *export_button = nullptr;
+	Button *export_all_button = nullptr;
+	AcceptDialog *export_all_dialog = nullptr;
 
-	LineEdit *custom_features;
-	RichTextLabel *custom_feature_display;
+	LineEdit *custom_features = nullptr;
+	RichTextLabel *custom_feature_display = nullptr;
 
-	OptionButton *script_mode;
-	LineEdit *script_key;
-	Label *script_key_error;
+	OptionButton *script_mode = nullptr;
+	LineEdit *script_key = nullptr;
+	Label *script_key_error = nullptr;
 
-	Label *export_error;
-	Label *export_warning;
-	HBoxContainer *export_templates_error;
+	Label *export_error = nullptr;
+	Label *export_warning = nullptr;
+	HBoxContainer *export_templates_error = nullptr;
 
 	String default_filename;
 
@@ -127,15 +127,15 @@ private:
 	bool can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const;
 	void drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from);
 
-	EditorFileDialog *export_pck_zip;
-	EditorFileDialog *export_project;
-	CheckBox *export_debug;
-	CheckBox *export_pck_zip_debug;
+	EditorFileDialog *export_pck_zip = nullptr;
+	EditorFileDialog *export_project = nullptr;
+	CheckBox *export_debug = nullptr;
+	CheckBox *export_pck_zip_debug = nullptr;
 
-	CheckButton *enc_pck;
-	CheckButton *enc_directory;
-	LineEdit *enc_in_filters;
-	LineEdit *enc_ex_filters;
+	CheckButton *enc_pck = nullptr;
+	CheckButton *enc_directory = nullptr;
+	LineEdit *enc_in_filters = nullptr;
+	LineEdit *enc_ex_filters = nullptr;
 
 	void _open_export_template_manager();
 
diff --git a/editor/project_settings_editor.h b/editor/project_settings_editor.h
index 5dc1ddc0a802..c9d849abec35 100644
--- a/editor/project_settings_editor.h
+++ b/editor/project_settings_editor.h
@@ -47,34 +47,34 @@ class ProjectSettingsEditor : public AcceptDialog {
 	GDCLASS(ProjectSettingsEditor, AcceptDialog);
 
 	static ProjectSettingsEditor *singleton;
-	ProjectSettings *ps;
-	Timer *timer;
+	ProjectSettings *ps = nullptr;
+	Timer *timer = nullptr;
 
-	TabContainer *tab_container;
-	SectionedInspector *general_settings_inspector;
-	ActionMapEditor *action_map_editor;
-	LocalizationEditor *localization_editor;
-	EditorAutoloadSettings *autoload_settings;
-	ShaderGlobalsEditor *shaders_global_variables_editor;
-	EditorPluginSettings *plugin_settings;
+	TabContainer *tab_container = nullptr;
+	SectionedInspector *general_settings_inspector = nullptr;
+	ActionMapEditor *action_map_editor = nullptr;
+	LocalizationEditor *localization_editor = nullptr;
+	EditorAutoloadSettings *autoload_settings = nullptr;
+	ShaderGlobalsEditor *shaders_global_variables_editor = nullptr;
+	EditorPluginSettings *plugin_settings = nullptr;
 
-	LineEdit *search_box;
-	CheckButton *advanced;
+	LineEdit *search_box = nullptr;
+	CheckButton *advanced = nullptr;
 
-	LineEdit *property_box;
-	OptionButton *feature_box;
-	OptionButton *type_box;
-	Button *add_button;
-	Button *del_button;
+	LineEdit *property_box = nullptr;
+	OptionButton *feature_box = nullptr;
+	OptionButton *type_box = nullptr;
+	Button *add_button = nullptr;
+	Button *del_button = nullptr;
 
-	Label *restart_label;
-	TextureRect *restart_icon;
-	PanelContainer *restart_container;
-	Button *restart_close_button;
+	Label *restart_label = nullptr;
+	TextureRect *restart_icon = nullptr;
+	PanelContainer *restart_container = nullptr;
+	Button *restart_close_button = nullptr;
 
-	ImportDefaultsEditor *import_defaults_editor;
-	EditorData *data;
-	UndoRedo *undo_redo;
+	ImportDefaultsEditor *import_defaults_editor = nullptr;
+	EditorData *data = nullptr;
+	UndoRedo *undo_redo = nullptr;
 
 	void _advanced_toggled(bool p_button_pressed);
 	void _property_box_changed(const String &p_text);
diff --git a/editor/property_editor.h b/editor/property_editor.h
index 73306e0bc298..1a4d88f7faa9 100644
--- a/editor/property_editor.h
+++ b/editor/property_editor.h
@@ -95,11 +95,11 @@ class CustomPropertyEditor : public PopupPanel {
 		EASING_OUT_IN
 	};
 
-	PopupMenu *menu;
-	SceneTreeDialog *scene_tree;
-	EditorFileDialog *file;
-	EditorLocaleDialog *locale;
-	ConfirmationDialog *error;
+	PopupMenu *menu = nullptr;
+	SceneTreeDialog *scene_tree = nullptr;
+	EditorFileDialog *file = nullptr;
+	EditorLocaleDialog *locale = nullptr;
+	ConfirmationDialog *error = nullptr;
 	String name;
 	Variant::Type type;
 	Variant v;
@@ -107,34 +107,34 @@ class CustomPropertyEditor : public PopupPanel {
 	int hint;
 	String hint_text;
 	HBoxContainer *value_hboxes[MAX_VALUE_EDITORS / 4];
-	VBoxContainer *value_vbox;
+	VBoxContainer *value_vbox = nullptr;
 	LineEdit *value_editor[MAX_VALUE_EDITORS];
 	int focused_value_editor;
 	Label *value_label[MAX_VALUE_EDITORS];
 	HScrollBar *scroll[4];
-	HBoxContainer *action_hboxes;
+	HBoxContainer *action_hboxes = nullptr;
 	Button *action_buttons[MAX_ACTION_BUTTONS];
-	MenuButton *type_button;
+	MenuButton *type_button = nullptr;
 	Vector<String> inheritors_array;
-	TextureRect *texture_preview;
-	ColorPicker *color_picker;
-	TextEdit *text_edit;
+	TextureRect *texture_preview = nullptr;
+	ColorPicker *color_picker = nullptr;
+	TextEdit *text_edit = nullptr;
 	bool read_only = false;
 	bool picking_viewport;
-	GridContainer *checks20gc;
+	GridContainer *checks20gc = nullptr;
 	CheckBox *checks20[20];
-	SpinBox *spinbox;
-	HSlider *slider;
+	SpinBox *spinbox = nullptr;
+	HSlider *slider = nullptr;
 
-	Control *easing_draw;
-	CreateDialog *create_dialog;
-	PropertySelector *property_select;
+	Control *easing_draw = nullptr;
+	CreateDialog *create_dialog = nullptr;
+	PropertySelector *property_select = nullptr;
 
-	Object *owner;
+	Object *owner = nullptr;
 
 	bool updating = false;
 
-	PropertyValueEvaluator *evaluator;
+	PropertyValueEvaluator *evaluator = nullptr;
 
 	void _text_edit_changed();
 	void _file_selected(String p_file);
diff --git a/editor/property_selector.h b/editor/property_selector.h
index 7e629a847ea4..597804da31bf 100644
--- a/editor/property_selector.h
+++ b/editor/property_selector.h
@@ -38,8 +38,8 @@
 class PropertySelector : public ConfirmationDialog {
 	GDCLASS(PropertySelector, ConfirmationDialog);
 
-	LineEdit *search_box;
-	Tree *search_options;
+	LineEdit *search_box = nullptr;
+	Tree *search_options = nullptr;
 
 	void _text_changed(const String &p_newtext);
 	void _sbox_input(const Ref<InputEvent> &p_ie);
@@ -48,14 +48,14 @@ class PropertySelector : public ConfirmationDialog {
 	void _item_selected();
 	void _hide_requested();
 
-	EditorHelpBit *help_bit;
+	EditorHelpBit *help_bit = nullptr;
 
 	bool properties;
 	String selected;
 	Variant::Type type;
 	String base_type;
 	ObjectID script;
-	Object *instance;
+	Object *instance = nullptr;
 	bool virtuals_only = false;
 
 	Vector<Variant::Type> type_filter;
diff --git a/editor/quick_open.h b/editor/quick_open.h
index f50f09604c48..843ef47711e3 100644
--- a/editor/quick_open.h
+++ b/editor/quick_open.h
@@ -39,8 +39,8 @@
 class EditorQuickOpen : public ConfirmationDialog {
 	GDCLASS(EditorQuickOpen, ConfirmationDialog);
 
-	LineEdit *search_box;
-	Tree *search_options;
+	LineEdit *search_box = nullptr;
+	Tree *search_options = nullptr;
 	StringName base_type;
 	bool allow_multi_select = false;
 
diff --git a/editor/rename_dialog.h b/editor/rename_dialog.h
index c9747795f0f5..d05e80fc043c 100644
--- a/editor/rename_dialog.h
+++ b/editor/rename_dialog.h
@@ -62,41 +62,41 @@ class RenameDialog : public ConfirmationDialog {
 	void _update_preview_int(int new_value = 0);
 	static void _error_handler(void *p_self, const char *p_func, const char *p_file, int p_line, const char *p_error, const char *p_errorexp, bool p_editor_notify, ErrorHandlerType p_type);
 
-	SceneTreeEditor *scene_tree_editor;
-	UndoRedo *undo_redo;
+	SceneTreeEditor *scene_tree_editor = nullptr;
+	UndoRedo *undo_redo = nullptr;
 	int global_count;
 
-	LineEdit *lne_search;
-	LineEdit *lne_replace;
-	LineEdit *lne_prefix;
-	LineEdit *lne_suffix;
+	LineEdit *lne_search = nullptr;
+	LineEdit *lne_replace = nullptr;
+	LineEdit *lne_prefix = nullptr;
+	LineEdit *lne_suffix = nullptr;
 
-	TabContainer *tabc_features;
+	TabContainer *tabc_features = nullptr;
 
-	CheckBox *cbut_substitute;
-	CheckButton *cbut_regex;
-	CheckBox *cbut_process;
-	CheckBox *chk_per_level_counter;
+	CheckBox *cbut_substitute = nullptr;
+	CheckButton *cbut_regex = nullptr;
+	CheckBox *cbut_process = nullptr;
+	CheckBox *chk_per_level_counter = nullptr;
 
-	Button *but_insert_name;
-	Button *but_insert_parent;
-	Button *but_insert_type;
-	Button *but_insert_scene;
-	Button *but_insert_root;
-	Button *but_insert_count;
+	Button *but_insert_name = nullptr;
+	Button *but_insert_parent = nullptr;
+	Button *but_insert_type = nullptr;
+	Button *but_insert_scene = nullptr;
+	Button *but_insert_root = nullptr;
+	Button *but_insert_count = nullptr;
 
-	SpinBox *spn_count_start;
-	SpinBox *spn_count_step;
-	SpinBox *spn_count_padding;
+	SpinBox *spn_count_start = nullptr;
+	SpinBox *spn_count_step = nullptr;
+	SpinBox *spn_count_padding = nullptr;
 
-	OptionButton *opt_style;
-	OptionButton *opt_case;
+	OptionButton *opt_style = nullptr;
+	OptionButton *opt_case = nullptr;
 
-	Label *lbl_preview_title;
-	Label *lbl_preview;
+	Label *lbl_preview_title = nullptr;
+	Label *lbl_preview = nullptr;
 
 	List<Pair<NodePath, String>> to_rename;
-	Node *preview_node;
+	Node *preview_node = nullptr;
 	bool lock_preview_update;
 	ErrorHandlerList eh;
 	bool has_errors;
diff --git a/editor/reparent_dialog.h b/editor/reparent_dialog.h
index 981829a871a4..121a86e9f0b1 100644
--- a/editor/reparent_dialog.h
+++ b/editor/reparent_dialog.h
@@ -41,8 +41,8 @@
 class ReparentDialog : public ConfirmationDialog {
 	GDCLASS(ReparentDialog, ConfirmationDialog);
 
-	SceneTreeEditor *tree;
-	CheckBox *keep_transform;
+	SceneTreeEditor *tree = nullptr;
+	CheckBox *keep_transform = nullptr;
 
 	void _reparent();
 	void _cancel();
diff --git a/editor/scene_tree_dock.h b/editor/scene_tree_dock.h
index 938f83725d2e..711ac5bc53f8 100644
--- a/editor/scene_tree_dock.h
+++ b/editor/scene_tree_dock.h
@@ -109,29 +109,29 @@ class SceneTreeDock : public VBoxContainer {
 	bool reset_create_dialog = false;
 
 	int current_option;
-	CreateDialog *create_dialog;
+	CreateDialog *create_dialog = nullptr;
 #ifdef MODULE_REGEX_ENABLED
-	RenameDialog *rename_dialog;
+	RenameDialog *rename_dialog = nullptr;
 #endif // MODULE_REGEX_ENABLED
 
-	Button *button_add;
-	Button *button_instance;
-	Button *button_create_script;
-	Button *button_detach_script;
-	MenuButton *button_tree_menu;
+	Button *button_add = nullptr;
+	Button *button_instance = nullptr;
+	Button *button_create_script = nullptr;
+	Button *button_detach_script = nullptr;
+	MenuButton *button_tree_menu = nullptr;
 
-	Button *button_2d;
-	Button *button_3d;
-	Button *button_ui;
-	Button *button_custom;
-	Button *button_clipboard;
+	Button *button_2d = nullptr;
+	Button *button_3d = nullptr;
+	Button *button_ui = nullptr;
+	Button *button_custom = nullptr;
+	Button *button_clipboard = nullptr;
 
-	HBoxContainer *button_hb;
+	HBoxContainer *button_hb = nullptr;
 	Button *edit_local, *edit_remote;
-	SceneTreeEditor *scene_tree;
-	Control *remote_tree;
+	SceneTreeEditor *scene_tree = nullptr;
+	Control *remote_tree = nullptr;
 
-	HBoxContainer *tool_hbc;
+	HBoxContainer *tool_hbc = nullptr;
 	void _tool_selected(int p_tool, bool p_confirm_override = false);
 	void _property_selected(int p_idx);
 	void _node_collapsed(Object *p_obj);
@@ -140,40 +140,40 @@ class SceneTreeDock : public VBoxContainer {
 	String resource_drop_path;
 	void _perform_property_drop(Node *p_node, String p_property, RES p_res);
 
-	EditorData *editor_data;
-	EditorSelection *editor_selection;
+	EditorData *editor_data = nullptr;
+	EditorSelection *editor_selection = nullptr;
 
 	List<Node *> node_clipboard;
 	String clipboard_source_scene;
 	HashMap<String, Map<RES, RES>> clipboard_resource_remap;
 
-	ScriptCreateDialog *script_create_dialog;
-	ShaderCreateDialog *shader_create_dialog;
-	AcceptDialog *accept;
-	ConfirmationDialog *delete_dialog;
-	ConfirmationDialog *editable_instance_remove_dialog;
-	ConfirmationDialog *placeholder_editable_instance_remove_dialog;
+	ScriptCreateDialog *script_create_dialog = nullptr;
+	ShaderCreateDialog *shader_create_dialog = nullptr;
+	AcceptDialog *accept = nullptr;
+	ConfirmationDialog *delete_dialog = nullptr;
+	ConfirmationDialog *editable_instance_remove_dialog = nullptr;
+	ConfirmationDialog *placeholder_editable_instance_remove_dialog = nullptr;
 
-	ReparentDialog *reparent_dialog;
-	EditorQuickOpen *quick_open;
-	EditorFileDialog *new_scene_from_dialog;
+	ReparentDialog *reparent_dialog = nullptr;
+	EditorQuickOpen *quick_open = nullptr;
+	EditorFileDialog *new_scene_from_dialog = nullptr;
 
-	LineEdit *filter;
-	TextureRect *filter_icon;
+	LineEdit *filter = nullptr;
+	TextureRect *filter_icon = nullptr;
 
-	PopupMenu *menu;
-	PopupMenu *menu_subresources;
-	PopupMenu *menu_properties;
-	ConfirmationDialog *clear_inherit_confirm;
+	PopupMenu *menu = nullptr;
+	PopupMenu *menu_subresources = nullptr;
+	PopupMenu *menu_properties = nullptr;
+	ConfirmationDialog *clear_inherit_confirm = nullptr;
 
 	bool first_enter = true;
 
 	void _create();
 	void _do_create(Node *p_parent);
-	Node *scene_root;
-	Node *edited_scene;
+	Node *scene_root = nullptr;
+	Node *edited_scene = nullptr;
 
-	VBoxContainer *create_root_dialog;
+	VBoxContainer *create_root_dialog = nullptr;
 	String selected_favorite_root;
 
 	Ref<ShaderMaterial> selected_shader_material;
diff --git a/editor/scene_tree_editor.h b/editor/scene_tree_editor.h
index 2466b8576a16..547a5b57cacb 100644
--- a/editor/scene_tree_editor.h
+++ b/editor/scene_tree_editor.h
@@ -41,7 +41,7 @@
 class SceneTreeEditor : public Control {
 	GDCLASS(SceneTreeEditor, Control);
 
-	EditorSelection *editor_selection;
+	EditorSelection *editor_selection = nullptr;
 
 	enum SceneTreeEditorButton {
 		BUTTON_SUBSCENE = 0,
@@ -55,14 +55,14 @@ class SceneTreeEditor : public Control {
 		BUTTON_PIN = 8,
 	};
 
-	Tree *tree;
-	Node *selected;
+	Tree *tree = nullptr;
+	Node *selected = nullptr;
 	ObjectID instance_node;
 
 	String filter;
 
-	AcceptDialog *error;
-	AcceptDialog *warning;
+	AcceptDialog *error = nullptr;
+	AcceptDialog *warning = nullptr;
 
 	bool auto_expand_selected = true;
 	bool connect_to_script_mode = false;
@@ -96,7 +96,7 @@ class SceneTreeEditor : public Control {
 	bool show_enabled_subscene = false;
 
 	void _renamed();
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 
 	Set<Node *> marked;
 	bool marked_selectable = false;
@@ -125,7 +125,7 @@ class SceneTreeEditor : public Control {
 
 	void _warning_changed(Node *p_for_node);
 
-	Timer *update_timer;
+	Timer *update_timer = nullptr;
 
 	List<StringName> *script_types;
 	bool _is_script_type(const StringName &p_type) const;
@@ -166,10 +166,10 @@ public:
 class SceneTreeDialog : public ConfirmationDialog {
 	GDCLASS(SceneTreeDialog, ConfirmationDialog);
 
-	SceneTreeEditor *tree;
+	SceneTreeEditor *tree = nullptr;
 	//Button *select;
 	//Button *cancel;
-	LineEdit *filter;
+	LineEdit *filter = nullptr;
 
 	void _select();
 	void _cancel();
diff --git a/editor/script_create_dialog.h b/editor/script_create_dialog.h
index e9f634e2c09f..c7d8cfc38a77 100644
--- a/editor/script_create_dialog.h
+++ b/editor/script_create_dialog.h
@@ -45,27 +45,27 @@ class EditorFileDialog;
 class ScriptCreateDialog : public ConfirmationDialog {
 	GDCLASS(ScriptCreateDialog, ConfirmationDialog);
 
-	LineEdit *class_name;
-	Label *error_label;
-	Label *path_error_label;
-	Label *builtin_warning_label;
-	Label *script_name_warning_label;
-	Label *template_info_label;
-	PanelContainer *status_panel;
-	LineEdit *parent_name;
-	Button *parent_browse_button;
-	Button *parent_search_button;
-	OptionButton *language_menu;
-	OptionButton *template_menu;
-	LineEdit *file_path;
-	LineEdit *internal_name;
-	Button *path_button;
-	EditorFileDialog *file_browse;
-	CheckBox *internal;
-	CheckBox *use_templates;
-	VBoxContainer *path_vb;
-	AcceptDialog *alert;
-	CreateDialog *select_class;
+	LineEdit *class_name = nullptr;
+	Label *error_label = nullptr;
+	Label *path_error_label = nullptr;
+	Label *builtin_warning_label = nullptr;
+	Label *script_name_warning_label = nullptr;
+	Label *template_info_label = nullptr;
+	PanelContainer *status_panel = nullptr;
+	LineEdit *parent_name = nullptr;
+	Button *parent_browse_button = nullptr;
+	Button *parent_search_button = nullptr;
+	OptionButton *language_menu = nullptr;
+	OptionButton *template_menu = nullptr;
+	LineEdit *file_path = nullptr;
+	LineEdit *internal_name = nullptr;
+	Button *path_button = nullptr;
+	EditorFileDialog *file_browse = nullptr;
+	CheckBox *internal = nullptr;
+	CheckBox *use_templates = nullptr;
+	VBoxContainer *path_vb = nullptr;
+	AcceptDialog *alert = nullptr;
+	CreateDialog *select_class = nullptr;
 	bool is_browsing_parent = false;
 	String template_inactive_message;
 	String initial_bp;
@@ -89,7 +89,7 @@ class ScriptCreateDialog : public ConfirmationDialog {
 	Control *name_controls[2];
 
 	Vector<ScriptLanguage::ScriptTemplate> template_list;
-	ScriptLanguage *language;
+	ScriptLanguage *language = nullptr;
 
 	String base_type;
 
diff --git a/editor/shader_globals_editor.h b/editor/shader_globals_editor.h
index 3b337e07dedb..d29052eaeec7 100644
--- a/editor/shader_globals_editor.h
+++ b/editor/shader_globals_editor.h
@@ -43,12 +43,12 @@ class ShaderGlobalsEditorInterface;
 class ShaderGlobalsEditor : public VBoxContainer {
 	GDCLASS(ShaderGlobalsEditor, VBoxContainer)
 
-	ShaderGlobalsEditorInterface *interface;
-	EditorInspector *inspector;
+	ShaderGlobalsEditorInterface *interface = nullptr;
+	EditorInspector *inspector = nullptr;
 
-	LineEdit *variable_name;
-	OptionButton *variable_type;
-	Button *variable_add;
+	LineEdit *variable_name = nullptr;
+	OptionButton *variable_type = nullptr;
+	Button *variable_add = nullptr;
 
 	void _variable_added();
 	void _variable_deleted(const String &p_variable);
diff --git a/modules/csg/csg_shape.h b/modules/csg/csg_shape.h
index 4721d0c11c6a..b5d5f97cf35a 100644
--- a/modules/csg/csg_shape.h
+++ b/modules/csg/csg_shape.h
@@ -368,7 +368,7 @@ private:
 	PathRotation path_rotation;
 	bool path_local;
 
-	Path3D *path;
+	Path3D *path = nullptr;
 
 	bool smooth_faces;
 	bool path_continuous_u;
diff --git a/modules/gdscript/gdscript.h b/modules/gdscript/gdscript.h
index f7fa96788332..82125610c25c 100644
--- a/modules/gdscript/gdscript.h
+++ b/modules/gdscript/gdscript.h
@@ -265,7 +265,7 @@ class GDScriptInstance : public ScriptInstance {
 	friend struct GDScriptUtilityFunctionsDefinitions;
 
 	ObjectID owner_id;
-	Object *owner;
+	Object *owner = nullptr;
 	Ref<GDScript> script;
 #ifdef DEBUG_ENABLED
 	Map<StringName, int> member_indices_cache; //used only for hot script reloading
@@ -311,17 +311,17 @@ class GDScriptLanguage : public ScriptLanguage {
 
 	static GDScriptLanguage *singleton;
 
-	Variant *_global_array;
+	Variant *_global_array = nullptr;
 	Vector<Variant> global_array;
 	Map<StringName, int> globals;
 	Map<StringName, Variant> named_globals;
 
 	struct CallLevel {
-		Variant *stack;
-		GDScriptFunction *function;
-		GDScriptInstance *instance;
-		int *ip;
-		int *line;
+		Variant *stack = nullptr;
+		GDScriptFunction *function = nullptr;
+		GDScriptInstance *instance = nullptr;
+		int *ip = nullptr;
+		int *line = nullptr;
 	};
 
 	int _debug_parse_err_line;
@@ -329,7 +329,7 @@ class GDScriptLanguage : public ScriptLanguage {
 	String _debug_error;
 	int _debug_call_stack_pos;
 	int _debug_max_call_stack;
-	CallLevel *_call_stack;
+	CallLevel *_call_stack = nullptr;
 
 	void _add_global(const StringName &p_name, const Variant &p_value);
 
diff --git a/modules/gdscript/language_server/gdscript_text_document.h b/modules/gdscript/language_server/gdscript_text_document.h
index eb7b2c024081..a0e584e525a6 100644
--- a/modules/gdscript/language_server/gdscript_text_document.h
+++ b/modules/gdscript/language_server/gdscript_text_document.h
@@ -40,7 +40,7 @@ class GDScriptTextDocument : public RefCounted {
 protected:
 	static void _bind_methods();
 
-	FileAccess *file_checker;
+	FileAccess *file_checker = nullptr;
 
 	void didOpen(const Variant &p_param);
 	void didClose(const Variant &p_param);
diff --git a/modules/gdscript/tests/gdscript_test_runner.h b/modules/gdscript/tests/gdscript_test_runner.h
index 1a950c68988e..d6c6419e217d 100644
--- a/modules/gdscript/tests/gdscript_test_runner.h
+++ b/modules/gdscript/tests/gdscript_test_runner.h
@@ -63,8 +63,8 @@ public:
 
 private:
 	struct ErrorHandlerData {
-		TestResult *result;
-		GDScriptTest *self;
+		TestResult *result = nullptr;
+		GDScriptTest *self = nullptr;
 		ErrorHandlerData(TestResult *p_result, GDScriptTest *p_this) {
 			result = p_result;
 			self = p_this;
diff --git a/modules/gridmap/editor/grid_map_editor_plugin.h b/modules/gridmap/editor/grid_map_editor_plugin.h
index adb0da6e2cf6..3b293975026b 100644
--- a/modules/gridmap/editor/grid_map_editor_plugin.h
+++ b/modules/gridmap/editor/grid_map_editor_plugin.h
@@ -62,21 +62,21 @@ class GridMapEditor : public VBoxContainer {
 		DISPLAY_LIST
 	};
 
-	UndoRedo *undo_redo;
+	UndoRedo *undo_redo = nullptr;
 	InputAction input_action = INPUT_NONE;
-	Panel *panel;
-	MenuButton *options;
-	SpinBox *floor;
+	Panel *panel = nullptr;
+	MenuButton *options = nullptr;
+	SpinBox *floor = nullptr;
 	double accumulated_floor_delta = 0.0;
-	Button *mode_thumbnail;
-	Button *mode_list;
-	LineEdit *search_box;
-	HSlider *size_slider;
-	HBoxContainer *spatial_editor_hb;
-	ConfirmationDialog *settings_dialog;
-	VBoxContainer *settings_vbc;
-	SpinBox *settings_pick_distance;
-	Label *spin_box_label;
+	Button *mode_thumbnail = nullptr;
+	Button *mode_list = nullptr;
+	LineEdit *search_box = nullptr;
+	HSlider *size_slider = nullptr;
+	HBoxContainer *spatial_editor_hb = nullptr;
+	ConfirmationDialog *settings_dialog = nullptr;
+	VBoxContainer *settings_vbc = nullptr;
+	SpinBox *settings_pick_distance = nullptr;
+	Label *spin_box_label = nullptr;
 
 	struct SetItem {
 		Vector3i position;
@@ -89,7 +89,7 @@ class GridMapEditor : public VBoxContainer {
 	List<SetItem> set_items;
 
 	GridMap *node = nullptr;
-	MeshLibrary *last_mesh_library;
+	MeshLibrary *last_mesh_library = nullptr;
 
 	Transform3D grid_xform;
 	Transform3D edit_grid_xform;
@@ -173,15 +173,15 @@ class GridMapEditor : public VBoxContainer {
 
 	};
 
-	Node3DEditorPlugin *spatial_editor;
+	Node3DEditorPlugin *spatial_editor = nullptr;
 
 	struct AreaDisplay {
 		RID mesh;
 		RID instance;
 	};
 
-	ItemList *mesh_library_palette;
-	Label *info_message;
+	ItemList *mesh_library_palette = nullptr;
+	Label *info_message = nullptr;
 
 	void update_grid(); // Change which and where the grid is displayed
 	void _draw_grids(const Vector3 &cell_size);
@@ -234,7 +234,7 @@ public:
 class GridMapEditorPlugin : public EditorPlugin {
 	GDCLASS(GridMapEditorPlugin, EditorPlugin);
 
-	GridMapEditor *grid_map_editor;
+	GridMapEditor *grid_map_editor = nullptr;
 
 protected:
 	void _notification(int p_what);
diff --git a/modules/mono/glue/arguments_vector.h b/modules/mono/glue/arguments_vector.h
index 7c991d87a4f6..4405809887a5 100644
--- a/modules/mono/glue/arguments_vector.h
+++ b/modules/mono/glue/arguments_vector.h
@@ -37,7 +37,7 @@ template <typename T, int POOL_SIZE = 5>
 struct ArgumentsVector {
 private:
 	T pool[POOL_SIZE];
-	T *_ptr;
+	T *_ptr = nullptr;
 	int size;
 
 	ArgumentsVector() = delete;
diff --git a/modules/mono/managed_callable.h b/modules/mono/managed_callable.h
index ea7231f43b67..d50a8a7b08fd 100644
--- a/modules/mono/managed_callable.h
+++ b/modules/mono/managed_callable.h
@@ -43,7 +43,7 @@
 class ManagedCallable : public CallableCustom {
 	friend class CSharpLanguage;
 	MonoGCHandleData delegate_handle;
-	GDMonoMethod *delegate_invoke;
+	GDMonoMethod *delegate_invoke = nullptr;
 
 #ifdef GD_MONO_HOT_RELOAD
 	SelfList<ManagedCallable> self_instance = this;
diff --git a/modules/mono/mono_gd/gd_mono.h b/modules/mono/mono_gd/gd_mono.h
index aab0b31c37a3..51fd0f8483ad 100644
--- a/modules/mono/mono_gd/gd_mono.h
+++ b/modules/mono/mono_gd/gd_mono.h
@@ -94,16 +94,16 @@ private:
 
 	UnhandledExceptionPolicy unhandled_exception_policy;
 
-	MonoDomain *root_domain;
-	MonoDomain *scripts_domain;
+	MonoDomain *root_domain = nullptr;
+	MonoDomain *scripts_domain = nullptr;
 
 	HashMap<int32_t, HashMap<String, GDMonoAssembly *>> assemblies;
 
-	GDMonoAssembly *corlib_assembly;
-	GDMonoAssembly *project_assembly;
+	GDMonoAssembly *corlib_assembly = nullptr;
+	GDMonoAssembly *project_assembly = nullptr;
 #ifdef TOOLS_ENABLED
-	GDMonoAssembly *tools_assembly;
-	GDMonoAssembly *tools_project_editor_assembly;
+	GDMonoAssembly *tools_assembly = nullptr;
+	GDMonoAssembly *tools_project_editor_assembly = nullptr;
 #endif
 
 	LoadedApiAssembly core_api_assembly;
@@ -150,7 +150,7 @@ private:
 	void _init_godot_api_hashes();
 	void _init_exception_policy();
 
-	GDMonoLog *gdmono_log;
+	GDMonoLog *gdmono_log = nullptr;
 
 #if defined(WINDOWS_ENABLED) && defined(TOOLS_ENABLED)
 	MonoRegInfo mono_reg_info;
@@ -250,7 +250,7 @@ public:
 namespace gdmono {
 
 class ScopeDomain {
-	MonoDomain *prev_domain;
+	MonoDomain *prev_domain = nullptr;
 
 public:
 	ScopeDomain(MonoDomain *p_domain) {
@@ -270,7 +270,7 @@ public:
 };
 
 class ScopeExitDomainUnload {
-	MonoDomain *domain;
+	MonoDomain *domain = nullptr;
 
 public:
 	ScopeExitDomainUnload(MonoDomain *p_domain) :
diff --git a/modules/mono/mono_gd/gd_mono_assembly.h b/modules/mono/mono_gd/gd_mono_assembly.h
index b25d773be7c2..a96357b0820c 100644
--- a/modules/mono/mono_gd/gd_mono_assembly.h
+++ b/modules/mono/mono_gd/gd_mono_assembly.h
@@ -68,8 +68,8 @@ class GDMonoAssembly {
 	};
 
 	String name;
-	MonoImage *image;
-	MonoAssembly *assembly;
+	MonoImage *image = nullptr;
+	MonoAssembly *assembly = nullptr;
 
 	bool attrs_fetched = false;
 	MonoCustomAttrInfo *attributes = nullptr;
diff --git a/modules/mono/mono_gd/gd_mono_cache.h b/modules/mono/mono_gd/gd_mono_cache.h
index 49f47b0a15dc..4000342c9440 100644
--- a/modules/mono/mono_gd/gd_mono_cache.h
+++ b/modules/mono/mono_gd/gd_mono_cache.h
@@ -41,91 +41,91 @@ struct CachedData {
 	// corlib classes
 
 	// Let's use the no-namespace format for these too
-	GDMonoClass *class_MonoObject; // object
-	GDMonoClass *class_bool; // bool
-	GDMonoClass *class_int8_t; // sbyte
-	GDMonoClass *class_int16_t; // short
-	GDMonoClass *class_int32_t; // int
-	GDMonoClass *class_int64_t; // long
-	GDMonoClass *class_uint8_t; // byte
-	GDMonoClass *class_uint16_t; // ushort
-	GDMonoClass *class_uint32_t; // uint
-	GDMonoClass *class_uint64_t; // ulong
-	GDMonoClass *class_float; // float
-	GDMonoClass *class_double; // double
-	GDMonoClass *class_String; // string
-	GDMonoClass *class_IntPtr; // System.IntPtr
+	GDMonoClass *class_MonoObject = nullptr; // object
+	GDMonoClass *class_bool = nullptr; // bool
+	GDMonoClass *class_int8_t = nullptr; // sbyte
+	GDMonoClass *class_int16_t = nullptr; // short
+	GDMonoClass *class_int32_t = nullptr; // int
+	GDMonoClass *class_int64_t = nullptr; // long
+	GDMonoClass *class_uint8_t = nullptr; // byte
+	GDMonoClass *class_uint16_t = nullptr; // ushort
+	GDMonoClass *class_uint32_t = nullptr; // uint
+	GDMonoClass *class_uint64_t = nullptr; // ulong
+	GDMonoClass *class_float = nullptr; // float
+	GDMonoClass *class_double = nullptr; // double
+	GDMonoClass *class_String = nullptr; // string
+	GDMonoClass *class_IntPtr = nullptr; // System.IntPtr
 
-	GDMonoClass *class_System_Collections_IEnumerable;
-	GDMonoClass *class_System_Collections_ICollection;
-	GDMonoClass *class_System_Collections_IDictionary;
+	GDMonoClass *class_System_Collections_IEnumerable = nullptr;
+	GDMonoClass *class_System_Collections_ICollection = nullptr;
+	GDMonoClass *class_System_Collections_IDictionary = nullptr;
 
 #ifdef DEBUG_ENABLED
-	GDMonoClass *class_System_Diagnostics_StackTrace;
+	GDMonoClass *class_System_Diagnostics_StackTrace = nullptr;
 	GDMonoMethodThunkR<MonoArray *, MonoObject *> methodthunk_System_Diagnostics_StackTrace_GetFrames;
-	GDMonoMethod *method_System_Diagnostics_StackTrace_ctor_bool;
-	GDMonoMethod *method_System_Diagnostics_StackTrace_ctor_Exception_bool;
+	GDMonoMethod *method_System_Diagnostics_StackTrace_ctor_bool = nullptr;
+	GDMonoMethod *method_System_Diagnostics_StackTrace_ctor_Exception_bool = nullptr;
 #endif
 
-	GDMonoClass *class_KeyNotFoundException;
+	GDMonoClass *class_KeyNotFoundException = nullptr;
 
-	MonoClass *rawclass_Dictionary;
+	MonoClass *rawclass_Dictionary = nullptr;
 	// -----------------------------------------------
 
-	GDMonoClass *class_Vector2;
-	GDMonoClass *class_Vector2i;
-	GDMonoClass *class_Rect2;
-	GDMonoClass *class_Rect2i;
-	GDMonoClass *class_Transform2D;
-	GDMonoClass *class_Vector3;
-	GDMonoClass *class_Vector3i;
-	GDMonoClass *class_Basis;
-	GDMonoClass *class_Quaternion;
-	GDMonoClass *class_Transform3D;
-	GDMonoClass *class_AABB;
-	GDMonoClass *class_Color;
-	GDMonoClass *class_Plane;
-	GDMonoClass *class_StringName;
-	GDMonoClass *class_NodePath;
-	GDMonoClass *class_RID;
-	GDMonoClass *class_GodotObject;
-	GDMonoClass *class_GodotResource;
-	GDMonoClass *class_Node;
-	GDMonoClass *class_Control;
-	GDMonoClass *class_Node3D;
-	GDMonoClass *class_WeakRef;
-	GDMonoClass *class_Callable;
-	GDMonoClass *class_SignalInfo;
-	GDMonoClass *class_Array;
-	GDMonoClass *class_Dictionary;
-	GDMonoClass *class_MarshalUtils;
-	GDMonoClass *class_ISerializationListener;
+	GDMonoClass *class_Vector2 = nullptr;
+	GDMonoClass *class_Vector2i = nullptr;
+	GDMonoClass *class_Rect2 = nullptr;
+	GDMonoClass *class_Rect2i = nullptr;
+	GDMonoClass *class_Transform2D = nullptr;
+	GDMonoClass *class_Vector3 = nullptr;
+	GDMonoClass *class_Vector3i = nullptr;
+	GDMonoClass *class_Basis = nullptr;
+	GDMonoClass *class_Quaternion = nullptr;
+	GDMonoClass *class_Transform3D = nullptr;
+	GDMonoClass *class_AABB = nullptr;
+	GDMonoClass *class_Color = nullptr;
+	GDMonoClass *class_Plane = nullptr;
+	GDMonoClass *class_StringName = nullptr;
+	GDMonoClass *class_NodePath = nullptr;
+	GDMonoClass *class_RID = nullptr;
+	GDMonoClass *class_GodotObject = nullptr;
+	GDMonoClass *class_GodotResource = nullptr;
+	GDMonoClass *class_Node = nullptr;
+	GDMonoClass *class_Control = nullptr;
+	GDMonoClass *class_Node3D = nullptr;
+	GDMonoClass *class_WeakRef = nullptr;
+	GDMonoClass *class_Callable = nullptr;
+	GDMonoClass *class_SignalInfo = nullptr;
+	GDMonoClass *class_Array = nullptr;
+	GDMonoClass *class_Dictionary = nullptr;
+	GDMonoClass *class_MarshalUtils = nullptr;
+	GDMonoClass *class_ISerializationListener = nullptr;
 
 #ifdef DEBUG_ENABLED
-	GDMonoClass *class_DebuggingUtils;
+	GDMonoClass *class_DebuggingUtils = nullptr;
 	GDMonoMethodThunk<MonoObject *, MonoString **, int *, MonoString **> methodthunk_DebuggingUtils_GetStackFrameInfo;
 #endif
 
-	GDMonoClass *class_ExportAttribute;
-	GDMonoField *field_ExportAttribute_hint;
-	GDMonoField *field_ExportAttribute_hintString;
-	GDMonoClass *class_SignalAttribute;
-	GDMonoClass *class_ToolAttribute;
-	GDMonoClass *class_AnyPeerAttribute;
-	GDMonoClass *class_AuthorityAttribute;
-	GDMonoClass *class_GodotMethodAttribute;
-	GDMonoField *field_GodotMethodAttribute_methodName;
-	GDMonoClass *class_ScriptPathAttribute;
-	GDMonoField *field_ScriptPathAttribute_path;
-	GDMonoClass *class_AssemblyHasScriptsAttribute;
-	GDMonoField *field_AssemblyHasScriptsAttribute_requiresLookup;
-	GDMonoField *field_AssemblyHasScriptsAttribute_scriptTypes;
+	GDMonoClass *class_ExportAttribute = nullptr;
+	GDMonoField *field_ExportAttribute_hint = nullptr;
+	GDMonoField *field_ExportAttribute_hintString = nullptr;
+	GDMonoClass *class_SignalAttribute = nullptr;
+	GDMonoClass *class_ToolAttribute = nullptr;
+	GDMonoClass *class_AnyPeerAttribute = nullptr;
+	GDMonoClass *class_AuthorityAttribute = nullptr;
+	GDMonoClass *class_GodotMethodAttribute = nullptr;
+	GDMonoField *field_GodotMethodAttribute_methodName = nullptr;
+	GDMonoClass *class_ScriptPathAttribute = nullptr;
+	GDMonoField *field_ScriptPathAttribute_path = nullptr;
+	GDMonoClass *class_AssemblyHasScriptsAttribute = nullptr;
+	GDMonoField *field_AssemblyHasScriptsAttribute_requiresLookup = nullptr;
+	GDMonoField *field_AssemblyHasScriptsAttribute_scriptTypes = nullptr;
 
-	GDMonoField *field_GodotObject_ptr;
-	GDMonoField *field_StringName_ptr;
-	GDMonoField *field_NodePath_ptr;
-	GDMonoField *field_Image_ptr;
-	GDMonoField *field_RID_ptr;
+	GDMonoField *field_GodotObject_ptr = nullptr;
+	GDMonoField *field_StringName_ptr = nullptr;
+	GDMonoField *field_NodePath_ptr = nullptr;
+	GDMonoField *field_Image_ptr = nullptr;
+	GDMonoField *field_RID_ptr = nullptr;
 
 	GDMonoMethodThunk<MonoObject *> methodthunk_GodotObject_Dispose;
 	GDMonoMethodThunkR<Array *, MonoObject *> methodthunk_Array_GetPtr;
diff --git a/modules/mono/mono_gd/gd_mono_class.h b/modules/mono/mono_gd/gd_mono_class.h
index bfb5797d4bf2..b32d561f613d 100644
--- a/modules/mono/mono_gd/gd_mono_class.h
+++ b/modules/mono/mono_gd/gd_mono_class.h
@@ -70,11 +70,11 @@ class GDMonoClass {
 	StringName namespace_name;
 	StringName class_name;
 
-	MonoClass *mono_class;
-	GDMonoAssembly *assembly;
+	MonoClass *mono_class = nullptr;
+	GDMonoAssembly *assembly = nullptr;
 
 	bool attrs_fetched;
-	MonoCustomAttrInfo *attributes;
+	MonoCustomAttrInfo *attributes = nullptr;
 
 	// This contains both the original method names and remapped method names from the native Godot identifiers to the C# functions.
 	// Most method-related functions refer to this and it's possible this is unintuitive for outside users; this may be a prime location for refactoring or renaming.
diff --git a/modules/mono/mono_gd/gd_mono_field.h b/modules/mono/mono_gd/gd_mono_field.h
index abcdef378c68..87ef245f3fd7 100644
--- a/modules/mono/mono_gd/gd_mono_field.h
+++ b/modules/mono/mono_gd/gd_mono_field.h
@@ -36,14 +36,14 @@
 #include "i_mono_class_member.h"
 
 class GDMonoField : public IMonoClassMember {
-	GDMonoClass *owner;
-	MonoClassField *mono_field;
+	GDMonoClass *owner = nullptr;
+	MonoClassField *mono_field = nullptr;
 
 	StringName name;
 	ManagedType type;
 
 	bool attrs_fetched;
-	MonoCustomAttrInfo *attributes;
+	MonoCustomAttrInfo *attributes = nullptr;
 
 public:
 	virtual GDMonoClass *get_enclosing_class() const final { return owner; }
diff --git a/modules/mono/mono_gd/gd_mono_marshal.h b/modules/mono/mono_gd/gd_mono_marshal.h
index 20d4743e5c9d..eb33c6119e84 100644
--- a/modules/mono/mono_gd/gd_mono_marshal.h
+++ b/modules/mono/mono_gd/gd_mono_marshal.h
@@ -196,14 +196,14 @@ PackedVector3Array mono_array_to_PackedVector3Array(MonoArray *p_array);
 #pragma pack(push, 1)
 
 struct M_Callable {
-	MonoObject *target;
-	MonoObject *method_string_name;
-	MonoDelegate *delegate;
+	MonoObject *target = nullptr;
+	MonoObject *method_string_name = nullptr;
+	MonoDelegate *delegate = nullptr;
 };
 
 struct M_SignalInfo {
-	MonoObject *owner;
-	MonoObject *name_string_name;
+	MonoObject *owner = nullptr;
+	MonoObject *name_string_name = nullptr;
 };
 
 #pragma pack(pop)
diff --git a/modules/mono/mono_gd/gd_mono_method.h b/modules/mono/mono_gd/gd_mono_method.h
index 6e87a60ee2a1..be11ef5bfe08 100644
--- a/modules/mono/mono_gd/gd_mono_method.h
+++ b/modules/mono/mono_gd/gd_mono_method.h
@@ -54,7 +54,7 @@ class GDMonoMethod : public IMonoClassMember {
 
 	friend class GDMonoClass;
 
-	MonoMethod *mono_method;
+	MonoMethod *mono_method = nullptr;
 
 public:
 	virtual GDMonoClass *get_enclosing_class() const final;
diff --git a/modules/mono/mono_gd/gd_mono_property.h b/modules/mono/mono_gd/gd_mono_property.h
index 003bcf05e127..6fc681aeb58e 100644
--- a/modules/mono/mono_gd/gd_mono_property.h
+++ b/modules/mono/mono_gd/gd_mono_property.h
@@ -36,14 +36,14 @@
 #include "i_mono_class_member.h"
 
 class GDMonoProperty : public IMonoClassMember {
-	GDMonoClass *owner;
-	MonoProperty *mono_property;
+	GDMonoClass *owner = nullptr;
+	MonoProperty *mono_property = nullptr;
 
 	StringName name;
 	ManagedType type;
 
 	bool attrs_fetched;
-	MonoCustomAttrInfo *attributes;
+	MonoCustomAttrInfo *attributes = nullptr;
 
 	unsigned int param_buffer_size;
 
diff --git a/modules/mono/mono_gd/gd_mono_wasm_m2n.h b/modules/mono/mono_gd/gd_mono_wasm_m2n.h
index 68299aa984b2..83e2750e5a32 100644
--- a/modules/mono/mono_gd/gd_mono_wasm_m2n.h
+++ b/modules/mono/mono_gd/gd_mono_wasm_m2n.h
@@ -47,11 +47,11 @@ struct Mono_InterpMethodArguments {
 	size_t ilen;
 	void **iargs;
 	size_t flen;
-	double *fargs;
+	double *fargs = nullptr;
 	void **retval;
 	size_t is_float_ret;
 	//#ifdef TARGET_WASM
-	void *sig;
+	void *sig = nullptr;
 	//#endif
 };
 } // extern "C"
diff --git a/modules/mono/signal_awaiter_utils.h b/modules/mono/signal_awaiter_utils.h
index 1a62f366259c..532aa3e3273f 100644
--- a/modules/mono/signal_awaiter_utils.h
+++ b/modules/mono/signal_awaiter_utils.h
@@ -68,7 +68,7 @@ public:
 };
 
 class EventSignalCallable : public CallableCustom {
-	Object *owner;
+	Object *owner = nullptr;
 	const CSharpScript::EventSignal *event_signal;
 
 public:
diff --git a/modules/navigation/editor/navigation_mesh_editor_plugin.h b/modules/navigation/editor/navigation_mesh_editor_plugin.h
index 3c3e804fd2b2..bc9e4185b7d9 100644
--- a/modules/navigation/editor/navigation_mesh_editor_plugin.h
+++ b/modules/navigation/editor/navigation_mesh_editor_plugin.h
@@ -42,14 +42,14 @@ class NavigationMeshEditor : public Control {
 
 	GDCLASS(NavigationMeshEditor, Control);
 
-	AcceptDialog *err_dialog;
+	AcceptDialog *err_dialog = nullptr;
 
-	HBoxContainer *bake_hbox;
-	Button *button_bake;
-	Button *button_reset;
-	Label *bake_info;
+	HBoxContainer *bake_hbox = nullptr;
+	Button *button_bake = nullptr;
+	Button *button_reset = nullptr;
+	Label *bake_info = nullptr;
 
-	NavigationRegion3D *node;
+	NavigationRegion3D *node = nullptr;
 
 	void _bake_pressed();
 	void _clear_pressed();
@@ -68,7 +68,7 @@ public:
 class NavigationMeshEditorPlugin : public EditorPlugin {
 	GDCLASS(NavigationMeshEditorPlugin, EditorPlugin);
 
-	NavigationMeshEditor *navigation_mesh_editor;
+	NavigationMeshEditor *navigation_mesh_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "NavigationMesh"; }
diff --git a/modules/navigation/nav_utils.h b/modules/navigation/nav_utils.h
index 0c02885b109c..5b6c695ca4ea 100644
--- a/modules/navigation/nav_utils.h
+++ b/modules/navigation/nav_utils.h
@@ -89,7 +89,7 @@ struct Edge {
 };
 
 struct Polygon {
-	NavRegion *owner;
+	NavRegion *owner = nullptr;
 
 	/// The points of this `Polygon`
 	std::vector<Point> points;
diff --git a/modules/noise/noise.h b/modules/noise/noise.h
index c05bc057daaa..767aa830e88a 100644
--- a/modules/noise/noise.h
+++ b/modules/noise/noise.h
@@ -39,7 +39,7 @@ class Noise : public Resource {
 	// Helper struct for get_seamless_image(). See comments in .cpp for usage.
 	template <typename T>
 	struct img_buff {
-		T *img;
+		T *img = nullptr;
 		int width; // Array dimensions & default modulo for image.
 		int height;
 		int offset_x; // Offset index location on image (wrapped by specified modulo).
diff --git a/modules/openxr/editor/openxr_editor_plugin.h b/modules/openxr/editor/openxr_editor_plugin.h
index 9d04bc4e454c..af8ee7d54c76 100644
--- a/modules/openxr/editor/openxr_editor_plugin.h
+++ b/modules/openxr/editor/openxr_editor_plugin.h
@@ -37,7 +37,7 @@
 class OpenXREditorPlugin : public EditorPlugin {
 	GDCLASS(OpenXREditorPlugin, EditorPlugin);
 
-	OpenXRActionMapEditor *action_map_editor;
+	OpenXRActionMapEditor *action_map_editor = nullptr;
 
 public:
 	virtual String get_name() const override { return "OpenXRPlugin"; }
diff --git a/modules/openxr/extensions/openxr_extension_wrapper.h b/modules/openxr/extensions/openxr_extension_wrapper.h
index 5242ee606352..00f81731c2a9 100644
--- a/modules/openxr/extensions/openxr_extension_wrapper.h
+++ b/modules/openxr/extensions/openxr_extension_wrapper.h
@@ -43,7 +43,7 @@ class OpenXRAPI;
 
 class OpenXRExtensionWrapper {
 protected:
-	OpenXRAPI *openxr_api;
+	OpenXRAPI *openxr_api = nullptr;
 
 	// Store extension we require.
 	// If bool pointer is a nullptr this means this extension is mandatory and initialisation will fail if it is not available
diff --git a/modules/raycast/raycast_occlusion_cull.h b/modules/raycast/raycast_occlusion_cull.h
index a22e52dd1721..8453c5341dec 100644
--- a/modules/raycast/raycast_occlusion_cull.h
+++ b/modules/raycast/raycast_occlusion_cull.h
@@ -115,7 +115,7 @@ private:
 
 	struct Scenario {
 		struct RaycastThreadData {
-			CameraRayTile *rays;
+			CameraRayTile *rays = nullptr;
 			const uint32_t *masks;
 		};
 
@@ -124,7 +124,7 @@ private:
 			uint32_t vertex_count;
 			Transform3D xform;
 			const Vector3 *read;
-			Vector3 *write;
+			Vector3 *write = nullptr;
 		};
 
 		Thread *commit_thread = nullptr;
diff --git a/modules/regex/regex.h b/modules/regex/regex.h
index a745c50a587b..e7221f4070f3 100644
--- a/modules/regex/regex.h
+++ b/modules/regex/regex.h
@@ -71,7 +71,7 @@ public:
 class RegEx : public RefCounted {
 	GDCLASS(RegEx, RefCounted);
 
-	void *general_ctx;
+	void *general_ctx = nullptr;
 	void *code = nullptr;
 	String pattern;
 
diff --git a/modules/theora/video_stream_theora.h b/modules/theora/video_stream_theora.h
index 3bc96908a2ea..b61412e66530 100644
--- a/modules/theora/video_stream_theora.h
+++ b/modules/theora/video_stream_theora.h
@@ -112,7 +112,7 @@ class VideoStreamPlaybackTheora : public VideoStreamPlayback {
 	RingBuffer<uint8_t> ring_buffer;
 	Vector<uint8_t> read_buffer;
 	bool thread_eof = false;
-	Semaphore *thread_sem;
+	Semaphore *thread_sem = nullptr;
 	Thread thread;
 	SafeFlag thread_exit;
 
diff --git a/modules/visual_script/editor/visual_script_property_selector.h b/modules/visual_script/editor/visual_script_property_selector.h
index 6b5112f1afae..faf39a14e43e 100644
--- a/modules/visual_script/editor/visual_script_property_selector.h
+++ b/modules/visual_script/editor/visual_script_property_selector.h
@@ -62,23 +62,23 @@ class VisualScriptPropertySelector : public ConfirmationDialog {
 		SCOPE_ALL = SCOPE_BASE | SCOPE_INHERITERS | SCOPE_UNRELATED
 	};
 
-	LineEdit *search_box;
+	LineEdit *search_box = nullptr;
 
-	Button *case_sensitive_button;
-	Button *hierarchy_button;
+	Button *case_sensitive_button = nullptr;
+	Button *hierarchy_button = nullptr;
 
-	Button *search_visual_script_nodes;
-	Button *search_classes;
-	Button *search_operators;
+	Button *search_visual_script_nodes = nullptr;
+	Button *search_classes = nullptr;
+	Button *search_operators = nullptr;
 
-	Button *search_methods;
-	Button *search_signals;
-	Button *search_constants;
-	Button *search_properties;
-	Button *search_theme_items;
+	Button *search_methods = nullptr;
+	Button *search_signals = nullptr;
+	Button *search_constants = nullptr;
+	Button *search_properties = nullptr;
+	Button *search_theme_items = nullptr;
 
-	OptionButton *scope_combo;
-	Tree *results_tree;
+	OptionButton *scope_combo = nullptr;
+	Tree *results_tree = nullptr;
 
 	class SearchRunner;
 	Ref<SearchRunner> search_runner;
@@ -94,7 +94,7 @@ class VisualScriptPropertySelector : public ConfirmationDialog {
 	void _item_selected();
 	void _hide_requested();
 
-	EditorHelpBit *help_bit;
+	EditorHelpBit *help_bit = nullptr;
 
 	bool properties = false;
 	bool visual_script_generic = false;
@@ -104,9 +104,9 @@ class VisualScriptPropertySelector : public ConfirmationDialog {
 	String base_type;
 	String base_script;
 	ObjectID script;
-	Object *instance;
+	Object *instance = nullptr;
 	bool virtuals_only = false;
-	VBoxContainer *vbox;
+	VBoxContainer *vbox = nullptr;
 
 protected:
 	void _notification(int p_what);
@@ -159,9 +159,9 @@ class VisualScriptPropertySelector::SearchRunner : public RefCounted {
 		}
 	};
 
-	VisualScriptPropertySelector *selector_ui;
-	Control *ui_service;
-	Tree *results_tree;
+	VisualScriptPropertySelector *selector_ui = nullptr;
+	Control *ui_service = nullptr;
+	Tree *results_tree = nullptr;
 	String term;
 	int search_flags;
 	int scope_flags;
diff --git a/modules/visual_script/visual_script.h b/modules/visual_script/visual_script.h
index d72bdf912883..6b27af15f6d0 100644
--- a/modules/visual_script/visual_script.h
+++ b/modules/visual_script/visual_script.h
@@ -495,7 +495,7 @@ class VisualScriptLanguage : public ScriptLanguage {
 	String _debug_error;
 	int _debug_call_stack_pos = 0;
 	int _debug_max_call_stack;
-	CallLevel *_call_stack;
+	CallLevel *_call_stack = nullptr;
 
 public:
 	StringName notification = "_notification";
diff --git a/platform/android/os_android.h b/platform/android/os_android.h
index 48239b3f8457..a40e17dc2c34 100644
--- a/platform/android/os_android.h
+++ b/platform/android/os_android.h
@@ -52,7 +52,7 @@ private:
 #endif
 
 #if defined(VULKAN_ENABLED)
-	ANativeWindow *native_window;
+	ANativeWindow *native_window = nullptr;
 #endif
 
 	mutable String data_dir_cache;
@@ -60,10 +60,10 @@ private:
 
 	AudioDriverOpenSL audio_driver_android;
 
-	MainLoop *main_loop;
+	MainLoop *main_loop = nullptr;
 
-	GodotJavaWrapper *godot_java;
-	GodotIOJavaWrapper *godot_io_java;
+	GodotJavaWrapper *godot_java = nullptr;
+	GodotIOJavaWrapper *godot_io_java = nullptr;
 
 public:
 	static const char *ANDROID_EXEC_PATH;
diff --git a/platform/iphone/os_iphone.h b/platform/iphone/os_iphone.h
index 3281ff0cdb71..6a61f3a910f5 100644
--- a/platform/iphone/os_iphone.h
+++ b/platform/iphone/os_iphone.h
@@ -52,11 +52,11 @@ private:
 
 	AudioDriverCoreAudio audio_driver;
 
-	iOS *ios;
+	iOS *ios = nullptr;
 
-	JoypadIPhone *joypad_iphone;
+	JoypadIPhone *joypad_iphone = nullptr;
 
-	MainLoop *main_loop;
+	MainLoop *main_loop = nullptr;
 
 	virtual void initialize_core() override;
 	virtual void initialize() override;
diff --git a/platform/linuxbsd/display_server_x11.h b/platform/linuxbsd/display_server_x11.h
index 0f44aa4b11e5..cd673d94d978 100644
--- a/platform/linuxbsd/display_server_x11.h
+++ b/platform/linuxbsd/display_server_x11.h
@@ -108,7 +108,7 @@ class DisplayServerX11 : public DisplayServer {
 #endif
 
 #if defined(DBUS_ENABLED)
-	FreeDesktopScreenSaver *screensaver;
+	FreeDesktopScreenSaver *screensaver = nullptr;
 	bool keep_screen_on = false;
 #endif
 
@@ -168,7 +168,7 @@ class DisplayServerX11 : public DisplayServer {
 	String internal_clipboard_primary;
 	Window xdnd_source_window;
 	::Display *x11_display;
-	char *xmbstring;
+	char *xmbstring = nullptr;
 	int xmblen;
 	unsigned long last_timestamp;
 	::Time last_keyrelease_time;
@@ -249,7 +249,7 @@ class DisplayServerX11 : public DisplayServer {
 	typedef void (*xrr_free_monitors_t)(xrr_monitor_info *monitors);
 	xrr_get_monitors_t xrr_get_monitors;
 	xrr_free_monitors_t xrr_free_monitors;
-	void *xrandr_handle;
+	void *xrandr_handle = nullptr;
 	Bool xrandr_ext_ok;
 
 	struct Property {
diff --git a/platform/linuxbsd/gl_manager_x11.h b/platform/linuxbsd/gl_manager_x11.h
index 0bb0a446ab8f..e89caf3b3036 100644
--- a/platform/linuxbsd/gl_manager_x11.h
+++ b/platform/linuxbsd/gl_manager_x11.h
@@ -66,7 +66,7 @@ private:
 	struct GLDisplay {
 		GLDisplay() { context = nullptr; }
 		~GLDisplay();
-		GLManager_X11_Private *context;
+		GLManager_X11_Private *context = nullptr;
 		::Display *x11_display;
 		XVisualInfo x_vi;
 		XSetWindowAttributes x_swa;
@@ -82,7 +82,7 @@ private:
 	LocalVector<GLWindow> _windows;
 	LocalVector<GLDisplay> _displays;
 
-	GLWindow *_current_window;
+	GLWindow *_current_window = nullptr;
 
 	void _internal_set_current_window(GLWindow *p_win);
 
diff --git a/platform/linuxbsd/os_linuxbsd.h b/platform/linuxbsd/os_linuxbsd.h
index d3857e85f8f8..7b912ddee309 100644
--- a/platform/linuxbsd/os_linuxbsd.h
+++ b/platform/linuxbsd/os_linuxbsd.h
@@ -63,7 +63,7 @@ class OS_LinuxBSD : public OS_Unix {
 
 	CrashHandler crash_handler;
 
-	MainLoop *main_loop;
+	MainLoop *main_loop = nullptr;
 
 protected:
 	virtual void initialize() override;
diff --git a/platform/osx/joypad_osx.h b/platform/osx/joypad_osx.h
index 4ca7fb169869..b09d5ce34a45 100644
--- a/platform/osx/joypad_osx.h
+++ b/platform/osx/joypad_osx.h
@@ -94,7 +94,7 @@ class JoypadOSX {
 	};
 
 private:
-	Input *input;
+	Input *input = nullptr;
 	IOHIDManagerRef hid_manager;
 
 	Vector<joypad> device_list;
diff --git a/platform/uwp/joypad_uwp.h b/platform/uwp/joypad_uwp.h
index 29f51090560c..0869f1961dde 100644
--- a/platform/uwp/joypad_uwp.h
+++ b/platform/uwp/joypad_uwp.h
@@ -68,7 +68,7 @@ private:
 
 	ControllerDevice controllers[MAX_CONTROLLERS];
 
-	InputDefault *input;
+	InputDefault *input = nullptr;
 
 	void OnGamepadAdded(Platform::Object ^ sender, Windows::Gaming::Input::Gamepad ^ value);
 	void OnGamepadRemoved(Platform::Object ^ sender, Windows::Gaming::Input::Gamepad ^ value);
diff --git a/platform/uwp/os_uwp.h b/platform/uwp/os_uwp.h
index 573d86af7c50..f955be1da9f2 100644
--- a/platform/uwp/os_uwp.h
+++ b/platform/uwp/os_uwp.h
@@ -74,7 +74,7 @@ private:
 		KEY_EVENT_BUFFER_SIZE = 512
 	};
 
-	FILE *stdo;
+	FILE *stdo = nullptr;
 
 	KeyEvent key_event_buffer[KEY_EVENT_BUFFER_SIZE];
 	int key_event_pos;
@@ -87,16 +87,16 @@ private:
 	bool outside;
 	int old_x, old_y;
 	Point2i center;
-	RenderingServer *rendering_server;
+	RenderingServer *rendering_server = nullptr;
 	int pressrc;
 
-	ContextEGL_UWP *gl_context;
+	ContextEGL_UWP *gl_context = nullptr;
 	Windows::UI::Core::CoreWindow ^ window;
 
 	VideoMode video_mode;
 	int video_driver_index;
 
-	MainLoop *main_loop;
+	MainLoop *main_loop = nullptr;
 
 	AudioDriverXAudio2 audio_driver;
 
@@ -111,7 +111,7 @@ private:
 
 	CursorShape cursor_shape;
 
-	InputDefault *input;
+	InputDefault *input = nullptr;
 
 	JoypadUWP ^ joypad;
 
diff --git a/platform/windows/display_server_windows.h b/platform/windows/display_server_windows.h
index 71fedf2bca08..fcf4b5a728b1 100644
--- a/platform/windows/display_server_windows.h
+++ b/platform/windows/display_server_windows.h
@@ -392,7 +392,7 @@ class DisplayServerWindows : public DisplayServer {
 		Rect2i parent_safe_rect;
 	};
 
-	JoypadWindows *joypad;
+	JoypadWindows *joypad = nullptr;
 	HHOOK mouse_monitor = nullptr;
 	List<WindowID> popup_list;
 	uint64_t time_since_popup = 0;
diff --git a/platform/windows/gl_manager_windows.h b/platform/windows/gl_manager_windows.h
index 6423c548555e..f789cba32732 100644
--- a/platform/windows/gl_manager_windows.h
+++ b/platform/windows/gl_manager_windows.h
@@ -75,7 +75,7 @@ private:
 	LocalVector<GLWindow> _windows;
 	LocalVector<GLDisplay> _displays;
 
-	GLWindow *_current_window;
+	GLWindow *_current_window = nullptr;
 
 	PFNWGLSWAPINTERVALEXTPROC wglSwapIntervalEXT;
 	PFNWGLGETSWAPINTERVALEXTPROC wglGetSwapIntervalEXT;
diff --git a/platform/windows/joypad_windows.h b/platform/windows/joypad_windows.h
index 4f15bcf08035..d239471a5cf8 100644
--- a/platform/windows/joypad_windows.h
+++ b/platform/windows/joypad_windows.h
@@ -105,10 +105,10 @@ private:
 	typedef DWORD(WINAPI *XInputGetState_t)(DWORD dwUserIndex, XINPUT_STATE *pState);
 	typedef DWORD(WINAPI *XInputSetState_t)(DWORD dwUserIndex, XINPUT_VIBRATION *pVibration);
 
-	HWND *hWnd;
+	HWND *hWnd = nullptr;
 	HANDLE xinput_dll;
 	LPDIRECTINPUT8 dinput;
-	Input *input;
+	Input *input = nullptr;
 
 	int id_to_change;
 	int slider_count;
diff --git a/platform/windows/os_windows.h b/platform/windows/os_windows.h
index 5bfd24327ecb..adeecf37c571 100644
--- a/platform/windows/os_windows.h
+++ b/platform/windows/os_windows.h
@@ -60,14 +60,14 @@
 class JoypadWindows;
 class OS_Windows : public OS {
 #ifdef STDOUT_FILE
-	FILE *stdo;
+	FILE *stdo = nullptr;
 #endif
 
 	uint64_t ticks_start;
 	uint64_t ticks_per_second;
 
 	HINSTANCE hInstance;
-	MainLoop *main_loop;
+	MainLoop *main_loop = nullptr;
 
 #ifdef WASAPI_ENABLED
 	AudioDriverWASAPI driver_wasapi;
diff --git a/scene/2d/physical_bone_2d.h b/scene/2d/physical_bone_2d.h
index 9f31c22031b1..22d329c32069 100644
--- a/scene/2d/physical_bone_2d.h
+++ b/scene/2d/physical_bone_2d.h
@@ -49,7 +49,7 @@ private:
 	NodePath bone2d_nodepath;
 	bool follow_bone_when_simulating = false;
 
-	Joint2D *child_joint;
+	Joint2D *child_joint = nullptr;
 	bool auto_configure_joint = true;
 
 	bool simulate_physics = false;
diff --git a/scene/3d/skeleton_3d.h b/scene/3d/skeleton_3d.h
index 80ff2a1f79e7..279c3e49a2d2 100644
--- a/scene/3d/skeleton_3d.h
+++ b/scene/3d/skeleton_3d.h
@@ -44,13 +44,13 @@ class SkinReference : public RefCounted {
 	GDCLASS(SkinReference, RefCounted)
 	friend class Skeleton3D;
 
-	Skeleton3D *skeleton_node;
+	Skeleton3D *skeleton_node = nullptr;
 	RID skeleton;
 	Ref<Skin> skin;
 	uint32_t bind_count = 0;
 	uint64_t skeleton_version = 0;
 	Vector<uint32_t> skin_bone_indices;
-	uint32_t *skin_bone_indices_ptrs;
+	uint32_t *skin_bone_indices_ptrs = nullptr;
 	void _skin_changed();
 
 protected:
diff --git a/scene/gui/dialogs.h b/scene/gui/dialogs.h
index 11c701b0d5f2..41fd9c0a1062 100644
--- a/scene/gui/dialogs.h
+++ b/scene/gui/dialogs.h
@@ -45,10 +45,10 @@ class AcceptDialog : public Window {
 	GDCLASS(AcceptDialog, Window);
 
 	Window *parent_visible = nullptr;
-	Panel *bg;
-	HBoxContainer *hbc;
-	Label *label;
-	Button *ok;
+	Panel *bg = nullptr;
+	HBoxContainer *hbc = nullptr;
+	Label *label = nullptr;
+	Button *ok = nullptr;
 	bool hide_on_ok = true;
 	bool close_on_escape = true;
 
@@ -103,7 +103,7 @@ public:
 
 class ConfirmationDialog : public AcceptDialog {
 	GDCLASS(ConfirmationDialog, AcceptDialog);
-	Button *cancel;
+	Button *cancel = nullptr;
 
 protected:
 	static void _bind_methods();
diff --git a/scene/gui/file_dialog.h b/scene/gui/file_dialog.h
index 7a50efe40f6c..9bba93bb898e 100644
--- a/scene/gui/file_dialog.h
+++ b/scene/gui/file_dialog.h
@@ -65,34 +65,34 @@ public:
 	static RegisterFunc unregister_func;
 
 private:
-	ConfirmationDialog *makedialog;
-	LineEdit *makedirname;
+	ConfirmationDialog *makedialog = nullptr;
+	LineEdit *makedirname = nullptr;
 
-	Button *makedir;
+	Button *makedir = nullptr;
 	Access access = ACCESS_RESOURCES;
-	VBoxContainer *vbox;
+	VBoxContainer *vbox = nullptr;
 	FileMode mode;
-	LineEdit *dir;
-	HBoxContainer *drives_container;
-	HBoxContainer *shortcuts_container;
-	OptionButton *drives;
-	Tree *tree;
-	HBoxContainer *file_box;
-	LineEdit *file;
-	OptionButton *filter;
-	AcceptDialog *mkdirerr;
-	AcceptDialog *exterr;
-	DirAccess *dir_access;
-	ConfirmationDialog *confirm_save;
+	LineEdit *dir = nullptr;
+	HBoxContainer *drives_container = nullptr;
+	HBoxContainer *shortcuts_container = nullptr;
+	OptionButton *drives = nullptr;
+	Tree *tree = nullptr;
+	HBoxContainer *file_box = nullptr;
+	LineEdit *file = nullptr;
+	OptionButton *filter = nullptr;
+	AcceptDialog *mkdirerr = nullptr;
+	AcceptDialog *exterr = nullptr;
+	DirAccess *dir_access = nullptr;
+	ConfirmationDialog *confirm_save = nullptr;
 
-	Label *message;
+	Label *message = nullptr;
 
-	Button *dir_prev;
-	Button *dir_next;
-	Button *dir_up;
+	Button *dir_prev = nullptr;
+	Button *dir_next = nullptr;
+	Button *dir_up = nullptr;
 
-	Button *refresh;
-	Button *show_hidden;
+	Button *refresh = nullptr;
+	Button *show_hidden = nullptr;
 
 	Vector<String> filters;
 
diff --git a/scene/gui/gradient_edit.h b/scene/gui/gradient_edit.h
index 67531d4f4ad5..4e3c6525f9d1 100644
--- a/scene/gui/gradient_edit.h
+++ b/scene/gui/gradient_edit.h
@@ -38,8 +38,8 @@
 class GradientEdit : public Control {
 	GDCLASS(GradientEdit, Control);
 
-	PopupPanel *popup;
-	ColorPicker *picker;
+	PopupPanel *popup = nullptr;
+	ColorPicker *picker = nullptr;
 
 	bool grabbing = false;
 	int grabbed = -1;
diff --git a/scene/gui/graph_edit.h b/scene/gui/graph_edit.h
index b0d1944d6e17..18b9eeebd44c 100644
--- a/scene/gui/graph_edit.h
+++ b/scene/gui/graph_edit.h
@@ -46,7 +46,7 @@ class GraphEditFilter : public Control {
 
 	friend class GraphEdit;
 	friend class GraphEditMinimap;
-	GraphEdit *ge;
+	GraphEdit *ge = nullptr;
 	virtual bool has_point(const Point2 &p_point) const override;
 
 public:
@@ -58,7 +58,7 @@ class GraphEditMinimap : public Control {
 
 	friend class GraphEdit;
 	friend class GraphEditFilter;
-	GraphEdit *ge;
+	GraphEdit *ge = nullptr;
 
 protected:
 public:
@@ -109,20 +109,20 @@ public:
 	};
 
 private:
-	Label *zoom_label;
-	Button *zoom_minus;
-	Button *zoom_reset;
-	Button *zoom_plus;
+	Label *zoom_label = nullptr;
+	Button *zoom_minus = nullptr;
+	Button *zoom_reset = nullptr;
+	Button *zoom_plus = nullptr;
 
-	Button *snap_button;
-	SpinBox *snap_amount;
+	Button *snap_button = nullptr;
+	SpinBox *snap_amount = nullptr;
 
-	Button *minimap_button;
+	Button *minimap_button = nullptr;
 
-	Button *layout_button;
+	Button *layout_button = nullptr;
 
-	HScrollBar *h_scroll;
-	VScrollBar *v_scroll;
+	HScrollBar *h_scroll = nullptr;
+	VScrollBar *v_scroll = nullptr;
 
 	float port_grab_distance_horizontal = 0.0;
 	float port_grab_distance_vertical;
@@ -190,9 +190,9 @@ private:
 	void _scroll_moved(double);
 	virtual void gui_input(const Ref<InputEvent> &p_ev) override;
 
-	Control *connections_layer;
-	GraphEditFilter *top_layer;
-	GraphEditMinimap *minimap;
+	Control *connections_layer = nullptr;
+	GraphEditFilter *top_layer = nullptr;
+	GraphEditMinimap *minimap = nullptr;
 	void _top_layer_input(const Ref<InputEvent> &p_ev);
 
 	bool is_in_input_hotzone(GraphNode *p_graph_node, int p_slot_index, const Vector2 &p_mouse_pos, const Vector2i &p_port_size);
@@ -236,7 +236,7 @@ private:
 	void _set_drag_comment_enclosed_nodes(GraphNode *p_node, HashMap<StringName, Vector<GraphNode *>> &p_comment_enclosed_nodes, bool p_drag);
 	void _set_position_of_comment_enclosed_nodes(GraphNode *p_node, HashMap<StringName, Vector<GraphNode *>> &p_comment_enclosed_nodes, Vector2 p_pos);
 
-	HBoxContainer *zoom_hb;
+	HBoxContainer *zoom_hb = nullptr;
 
 	friend class GraphEditFilter;
 	bool _filter_input(const Point2 &p_point);
diff --git a/scene/gui/item_list.h b/scene/gui/item_list.h
index 96735678c1b9..ffbe7d055a52 100644
--- a/scene/gui/item_list.h
+++ b/scene/gui/item_list.h
@@ -98,7 +98,7 @@ private:
 
 	SelectMode select_mode = SELECT_SINGLE;
 	IconMode icon_mode = ICON_MODE_LEFT;
-	VScrollBar *scroll_bar;
+	VScrollBar *scroll_bar = nullptr;
 	TextParagraph::OverrunBehavior text_overrun_behavior = TextParagraph::OVERRUN_TRIM_ELLIPSIS;
 
 	uint64_t search_time_msec = 0;
diff --git a/scene/gui/menu_button.h b/scene/gui/menu_button.h
index 9cfb78025537..e3ead9c291d0 100644
--- a/scene/gui/menu_button.h
+++ b/scene/gui/menu_button.h
@@ -40,7 +40,7 @@ class MenuButton : public Button {
 	bool clicked = false;
 	bool switch_on_hover = false;
 	bool disable_shortcuts = false;
-	PopupMenu *popup;
+	PopupMenu *popup = nullptr;
 
 	Vector2i mouse_pos_adjusted;
 
diff --git a/scene/gui/option_button.h b/scene/gui/option_button.h
index 732730e0f4de..921b76c52a2d 100644
--- a/scene/gui/option_button.h
+++ b/scene/gui/option_button.h
@@ -37,7 +37,7 @@
 class OptionButton : public Button {
 	GDCLASS(OptionButton, Button);
 
-	PopupMenu *popup;
+	PopupMenu *popup = nullptr;
 	int current = -1;
 
 	void _focused(int p_which);
diff --git a/scene/gui/popup.h b/scene/gui/popup.h
index c45f4ddc246c..6211af4d204a 100644
--- a/scene/gui/popup.h
+++ b/scene/gui/popup.h
@@ -65,7 +65,7 @@ public:
 class PopupPanel : public Popup {
 	GDCLASS(PopupPanel, Popup);
 
-	Panel *panel;
+	Panel *panel = nullptr;
 
 protected:
 	void _update_child_rects();
diff --git a/scene/gui/popup_menu.h b/scene/gui/popup_menu.h
index 5ce55209d452..518ba14daeed 100644
--- a/scene/gui/popup_menu.h
+++ b/scene/gui/popup_menu.h
@@ -89,7 +89,7 @@ class PopupMenu : public Popup {
 	bool close_allowed = false;
 
 	Timer *minimum_lifetime_timer = nullptr;
-	Timer *submenu_timer;
+	Timer *submenu_timer = nullptr;
 	List<Rect2> autohide_areas;
 	Vector<Item> items;
 	MouseButton initial_button_mask = MouseButton::NONE;
@@ -125,9 +125,9 @@ class PopupMenu : public Popup {
 	uint64_t search_time_msec = 0;
 	String search_string = "";
 
-	MarginContainer *margin_container;
-	ScrollContainer *scroll_container;
-	Control *control;
+	MarginContainer *margin_container = nullptr;
+	ScrollContainer *scroll_container = nullptr;
+	Control *control = nullptr;
 
 	void _draw_items();
 	void _draw_background();
diff --git a/scene/gui/range.h b/scene/gui/range.h
index 597c50ca2650..46b0d39202ab 100644
--- a/scene/gui/range.h
+++ b/scene/gui/range.h
@@ -50,7 +50,7 @@ class Range : public Control {
 		void emit_changed(const char *p_what = "");
 	};
 
-	Shared *shared;
+	Shared *shared = nullptr;
 
 	void _ref_shared(Shared *p_shared);
 	void _unref_shared();
diff --git a/scene/gui/scroll_container.h b/scene/gui/scroll_container.h
index c00df87b18b4..b9fcf64db655 100644
--- a/scene/gui/scroll_container.h
+++ b/scene/gui/scroll_container.h
@@ -47,8 +47,8 @@ public:
 	};
 
 private:
-	HScrollBar *h_scroll;
-	VScrollBar *v_scroll;
+	HScrollBar *h_scroll = nullptr;
+	VScrollBar *v_scroll = nullptr;
 
 	Size2 child_max_size;
 
diff --git a/scene/gui/spin_box.h b/scene/gui/spin_box.h
index a15e3fe5f569..d118b2833405 100644
--- a/scene/gui/spin_box.h
+++ b/scene/gui/spin_box.h
@@ -38,11 +38,11 @@
 class SpinBox : public Range {
 	GDCLASS(SpinBox, Range);
 
-	LineEdit *line_edit;
+	LineEdit *line_edit = nullptr;
 	int last_w = 0;
 	bool update_on_text_changed = false;
 
-	Timer *range_click_timer;
+	Timer *range_click_timer = nullptr;
 	void _range_click_timeout();
 	void _release_mouse();
 
diff --git a/scene/gui/tab_container.h b/scene/gui/tab_container.h
index 225c24c25e84..9adaa0d844d1 100644
--- a/scene/gui/tab_container.h
+++ b/scene/gui/tab_container.h
@@ -38,7 +38,7 @@
 class TabContainer : public Container {
 	GDCLASS(TabContainer, Container);
 
-	TabBar *tab_bar;
+	TabBar *tab_bar = nullptr;
 	bool tabs_visible = true;
 	bool all_tabs_in_front = false;
 	bool menu_hovered = false;
diff --git a/scene/gui/text_edit.h b/scene/gui/text_edit.h
index 6deaf76e5ef3..7d36051a3793 100644
--- a/scene/gui/text_edit.h
+++ b/scene/gui/text_edit.h
@@ -325,7 +325,7 @@ private:
 	List<TextOperation> undo_stack;
 	List<TextOperation>::Element *undo_stack_pos = nullptr;
 
-	Timer *idle_detect;
+	Timer *idle_detect = nullptr;
 
 	uint32_t version = 0;
 	uint32_t saved_version = 0;
@@ -380,7 +380,7 @@ private:
 	bool draw_caret = true;
 
 	bool caret_blink_enabled = false;
-	Timer *caret_blink_timer;
+	Timer *caret_blink_timer = nullptr;
 
 	bool move_caret_on_right_click = true;
 
@@ -426,7 +426,7 @@ private:
 
 	bool dragging_selection = false;
 
-	Timer *click_select_held;
+	Timer *click_select_held = nullptr;
 	uint64_t last_dblclk = 0;
 	Vector2 last_dblclk_pos;
 	void _click_selection_held();
@@ -449,8 +449,8 @@ private:
 	void _update_caret_wrap_offset();
 
 	/* Viewport. */
-	HScrollBar *h_scroll;
-	VScrollBar *v_scroll;
+	HScrollBar *h_scroll = nullptr;
+	VScrollBar *v_scroll = nullptr;
 
 	bool scroll_past_end_of_file_enabled = false;
 
diff --git a/scene/gui/tree.h b/scene/gui/tree.h
index 04d4b9b93539..74ad4f94b87f 100644
--- a/scene/gui/tree.h
+++ b/scene/gui/tree.h
@@ -134,7 +134,7 @@ private:
 
 	Vector<TreeItem *> children_cache;
 	bool is_root = false; // for tree root
-	Tree *tree; // tree (for reference)
+	Tree *tree = nullptr; // tree (for reference)
 
 	TreeItem(Tree *p_tree);
 
@@ -428,18 +428,18 @@ private:
 
 	bool show_column_titles = false;
 
-	VBoxContainer *popup_editor_vb;
+	VBoxContainer *popup_editor_vb = nullptr;
 
-	Popup *popup_editor;
+	Popup *popup_editor = nullptr;
 	LineEdit *text_editor = nullptr;
-	HSlider *value_editor;
+	HSlider *value_editor = nullptr;
 	bool updating_value_editor = false;
 	uint64_t focus_in_id = 0;
 	PopupMenu *popup_menu = nullptr;
 
 	Vector<ColumnInfo> columns;
 
-	Timer *range_click_timer;
+	Timer *range_click_timer = nullptr;
 	TreeItem *range_item_last = nullptr;
 	bool range_up_last = false;
 	void _range_click_timeout();
@@ -553,8 +553,8 @@ private:
 	int _get_title_button_height() const;
 
 	void _scroll_moved(float p_value);
-	HScrollBar *h_scroll;
-	VScrollBar *v_scroll;
+	HScrollBar *h_scroll = nullptr;
+	VScrollBar *v_scroll = nullptr;
 
 	bool h_scroll_enabled = true;
 	bool v_scroll_enabled = true;
diff --git a/scene/main/http_request.h b/scene/main/http_request.h
index 26d648458fd3..8b3441f7d7da 100644
--- a/scene/main/http_request.h
+++ b/scene/main/http_request.h
@@ -144,7 +144,7 @@ public:
 	void set_max_redirects(int p_max);
 	int get_max_redirects() const;
 
-	Timer *timer;
+	Timer *timer = nullptr;
 
 	void set_timeout(double p_timeout);
 	double get_timeout();
diff --git a/scene/main/scene_tree.h b/scene/main/scene_tree.h
index 10839ca425c8..0f8cbedb414b 100644
--- a/scene/main/scene_tree.h
+++ b/scene/main/scene_tree.h
@@ -115,7 +115,7 @@ private:
 	int node_count = 0;
 
 #ifdef TOOLS_ENABLED
-	Node *edited_scene_root;
+	Node *edited_scene_root = nullptr;
 #endif
 	struct UGCall {
 		StringName group;
@@ -138,7 +138,7 @@ private:
 
 	Array _get_nodes_in_group(const StringName &p_group);
 
-	Node *current_scene;
+	Node *current_scene = nullptr;
 
 	Color debug_collisions_color;
 	Color debug_collision_contact_color;
diff --git a/scene/multiplayer/scene_cache_interface.h b/scene/multiplayer/scene_cache_interface.h
index c709d26b5117..d53cf387fb2a 100644
--- a/scene/multiplayer/scene_cache_interface.h
+++ b/scene/multiplayer/scene_cache_interface.h
@@ -37,7 +37,7 @@ class SceneCacheInterface : public MultiplayerCacheInterface {
 	GDCLASS(SceneCacheInterface, MultiplayerCacheInterface);
 
 private:
-	MultiplayerAPI *multiplayer;
+	MultiplayerAPI *multiplayer = nullptr;
 
 	//path sent caches
 	struct PathSentCache {
diff --git a/scene/multiplayer/scene_replication_interface.h b/scene/multiplayer/scene_replication_interface.h
index 855878d029a1..60ac95c93c03 100644
--- a/scene/multiplayer/scene_replication_interface.h
+++ b/scene/multiplayer/scene_replication_interface.h
@@ -47,7 +47,7 @@ private:
 	void _free_remotes(int p_peer);
 
 	Ref<SceneReplicationState> rep_state;
-	MultiplayerAPI *multiplayer;
+	MultiplayerAPI *multiplayer = nullptr;
 	PackedByteArray packet_cache;
 	int sync_mtu = 1350; // Highly dependent on underlying protocol.
 
diff --git a/scene/resources/skeleton_modification_2d.h b/scene/resources/skeleton_modification_2d.h
index d49f9e7f51ce..3b9235ffd8fc 100644
--- a/scene/resources/skeleton_modification_2d.h
+++ b/scene/resources/skeleton_modification_2d.h
@@ -49,7 +49,7 @@ class SkeletonModification2D : public Resource {
 protected:
 	static void _bind_methods();
 
-	SkeletonModificationStack2D *stack;
+	SkeletonModificationStack2D *stack = nullptr;
 	int execution_mode = 0; // 0 = process
 
 	bool enabled = true;
diff --git a/scene/resources/skeleton_modification_3d.h b/scene/resources/skeleton_modification_3d.h
index a81c0c38bd26..ab736fcbd295 100644
--- a/scene/resources/skeleton_modification_3d.h
+++ b/scene/resources/skeleton_modification_3d.h
@@ -44,7 +44,7 @@ class SkeletonModification3D : public Resource {
 protected:
 	static void _bind_methods();
 
-	SkeletonModificationStack3D *stack;
+	SkeletonModificationStack3D *stack = nullptr;
 	int execution_mode = 0; // 0 = process
 
 	bool enabled = true;
diff --git a/servers/audio/audio_driver_dummy.h b/servers/audio/audio_driver_dummy.h
index 6324e2f5d36f..68b523e08676 100644
--- a/servers/audio/audio_driver_dummy.h
+++ b/servers/audio/audio_driver_dummy.h
@@ -40,7 +40,7 @@ class AudioDriverDummy : public AudioDriver {
 	Thread thread;
 	Mutex mutex;
 
-	int32_t *samples_in;
+	int32_t *samples_in = nullptr;
 
 	static void thread_func(void *p_udata);
 
diff --git a/servers/audio/audio_filter_sw.h b/servers/audio/audio_filter_sw.h
index 9e55662d0a07..1ec1abd4d5e3 100644
--- a/servers/audio/audio_filter_sw.h
+++ b/servers/audio/audio_filter_sw.h
@@ -57,7 +57,7 @@ public:
 
 	class Processor { // simple filter processor
 
-		AudioFilterSW *filter;
+		AudioFilterSW *filter = nullptr;
 		Coeffs coeffs;
 		float ha1, ha2, hb1, hb2; //history
 		Coeffs incr_coeffs;
diff --git a/servers/audio/audio_rb_resampler.h b/servers/audio/audio_rb_resampler.h
index 3fbe684c3ea2..81ac6332e21f 100644
--- a/servers/audio/audio_rb_resampler.h
+++ b/servers/audio/audio_rb_resampler.h
@@ -55,8 +55,8 @@ struct AudioRBResampler {
 		MIX_FRAC_MASK = MIX_FRAC_LEN - 1,
 	};
 
-	float *read_buf;
-	float *rb;
+	float *read_buf = nullptr;
+	float *rb = nullptr;
 
 	template <int C>
 	uint32_t _resample(AudioFrame *p_dest, int p_todo, int32_t p_increment);
diff --git a/servers/audio/effects/audio_effect_stereo_enhance.h b/servers/audio/effects/audio_effect_stereo_enhance.h
index 8b8b7b47a0a1..1f93d1cf9fe7 100644
--- a/servers/audio/effects/audio_effect_stereo_enhance.h
+++ b/servers/audio/effects/audio_effect_stereo_enhance.h
@@ -44,7 +44,7 @@ class AudioEffectStereoEnhanceInstance : public AudioEffectInstance {
 		MAX_DELAY_MS = 50
 	};
 
-	float *delay_ringbuff;
+	float *delay_ringbuff = nullptr;
 	unsigned int ringbuff_pos;
 	unsigned int ringbuff_mask;
 
diff --git a/servers/audio/effects/audio_stream_generator.h b/servers/audio/effects/audio_stream_generator.h
index 51288262b353..2ce4b95fcfac 100644
--- a/servers/audio/effects/audio_stream_generator.h
+++ b/servers/audio/effects/audio_stream_generator.h
@@ -65,7 +65,7 @@ class AudioStreamGeneratorPlayback : public AudioStreamPlaybackResampled {
 	int skips;
 	bool active;
 	float mixed;
-	AudioStreamGenerator *generator;
+	AudioStreamGenerator *generator = nullptr;
 
 protected:
 	virtual int _mix_internal(AudioFrame *p_buffer, int p_frames) override;
diff --git a/servers/audio/effects/reverb.h b/servers/audio/effects/reverb.h
index ff59ab8d82cc..de25e8c52b9a 100644
--- a/servers/audio/effects/reverb.h
+++ b/servers/audio/effects/reverb.h
@@ -75,7 +75,7 @@ private:
 
 	Comb comb[MAX_COMBS];
 	AllPass allpass[MAX_ALLPASS];
-	float *input_buffer;
+	float *input_buffer = nullptr;
 	float *echo_buffer = nullptr;
 	int echo_buffer_size;
 	int echo_buffer_pos;
diff --git a/servers/audio_server.h b/servers/audio_server.h
index 0c150427f22b..5563d60e4aaf 100644
--- a/servers/audio_server.h
+++ b/servers/audio_server.h
@@ -284,7 +284,7 @@ private:
 
 	struct CallbackItem {
 		AudioCallback callback;
-		void *userdata;
+		void *userdata = nullptr;
 	};
 
 	SafeList<CallbackItem *> update_callback_list;
diff --git a/servers/extensions/physics_server_3d_extension.h b/servers/extensions/physics_server_3d_extension.h
index 77e867a05a17..ce6bed41c97f 100644
--- a/servers/extensions/physics_server_3d_extension.h
+++ b/servers/extensions/physics_server_3d_extension.h
@@ -193,7 +193,7 @@ typedef PhysicsServer3D::MotionCollision PhysicsServer3DExtensionMotionCollision
 typedef PhysicsServer3D::MotionResult PhysicsServer3DExtensionMotionResult;
 
 struct PhysicsServer3DExtensionStateCallback {
-	void *instance;
+	void *instance = nullptr;
 	void (*callback)(void *p_instance, PhysicsDirectBodyState3D *p_state);
 };
 
diff --git a/servers/physics_3d/godot_area_pair_3d.h b/servers/physics_3d/godot_area_pair_3d.h
index c416477204a0..64b43a3b5185 100644
--- a/servers/physics_3d/godot_area_pair_3d.h
+++ b/servers/physics_3d/godot_area_pair_3d.h
@@ -37,8 +37,8 @@
 #include "godot_soft_body_3d.h"
 
 class GodotAreaPair3D : public GodotConstraint3D {
-	GodotBody3D *body;
-	GodotArea3D *area;
+	GodotBody3D *body = nullptr;
+	GodotArea3D *area = nullptr;
 	int body_shape;
 	int area_shape;
 	bool colliding = false;
@@ -55,8 +55,8 @@ public:
 };
 
 class GodotArea2Pair3D : public GodotConstraint3D {
-	GodotArea3D *area_a;
-	GodotArea3D *area_b;
+	GodotArea3D *area_a = nullptr;
+	GodotArea3D *area_b = nullptr;
 	int shape_a;
 	int shape_b;
 	bool colliding_a = false;
@@ -76,8 +76,8 @@ public:
 };
 
 class GodotAreaSoftBodyPair3D : public GodotConstraint3D {
-	GodotSoftBody3D *soft_body;
-	GodotArea3D *area;
+	GodotSoftBody3D *soft_body = nullptr;
+	GodotArea3D *area = nullptr;
 	int soft_body_shape;
 	int area_shape;
 	bool colliding = false;
diff --git a/servers/physics_3d/godot_physics_server_3d.h b/servers/physics_3d/godot_physics_server_3d.h
index 00ed763e010a..d2078a912c76 100644
--- a/servers/physics_3d/godot_physics_server_3d.h
+++ b/servers/physics_3d/godot_physics_server_3d.h
@@ -74,7 +74,7 @@ public:
 	struct CollCbkData {
 		int max;
 		int amount;
-		Vector3 *ptr;
+		Vector3 *ptr = nullptr;
 	};
 
 	static void _shape_col_cbk(const Vector3 &p_point_A, int p_index_A, const Vector3 &p_point_B, int p_index_B, void *p_userdata);
diff --git a/servers/physics_3d/godot_space_3d.h b/servers/physics_3d/godot_space_3d.h
index ac54c8bf695b..6308ede9a997 100644
--- a/servers/physics_3d/godot_space_3d.h
+++ b/servers/physics_3d/godot_space_3d.h
@@ -47,7 +47,7 @@ class GodotPhysicsDirectSpaceState3D : public PhysicsDirectSpaceState3D {
 	GDCLASS(GodotPhysicsDirectSpaceState3D, PhysicsDirectSpaceState3D);
 
 public:
-	GodotSpace3D *space;
+	GodotSpace3D *space = nullptr;
 
 	virtual int intersect_point(const PointParameters &p_parameters, ShapeResult *r_results, int p_result_max) override;
 	virtual bool intersect_ray(const RayParameters &p_parameters, RayResult &r_result) override;
diff --git a/servers/rendering/renderer_canvas_cull.h b/servers/rendering/renderer_canvas_cull.h
index fc53ce232740..94bae30ae048 100644
--- a/servers/rendering/renderer_canvas_cull.h
+++ b/servers/rendering/renderer_canvas_cull.h
@@ -124,7 +124,7 @@ public:
 		Set<RID> viewports;
 		struct ChildItem {
 			Point2 mirror;
-			Item *item;
+			Item *item = nullptr;
 			bool operator<(const ChildItem &p_item) const {
 				return item->index < p_item.item->index;
 			}
diff --git a/servers/rendering/renderer_canvas_render.h b/servers/rendering/renderer_canvas_render.h
index 956795f4144e..46ca3b0da844 100644
--- a/servers/rendering/renderer_canvas_render.h
+++ b/servers/rendering/renderer_canvas_render.h
@@ -83,10 +83,10 @@ public:
 		Transform2D light_shader_xform;
 		//Vector2 light_shader_pos;
 
-		Light *shadows_next_ptr;
-		Light *filter_next_ptr;
-		Light *next_ptr;
-		Light *directional_next_ptr;
+		Light *shadows_next_ptr = nullptr;
+		Light *filter_next_ptr = nullptr;
+		Light *next_ptr = nullptr;
+		Light *directional_next_ptr = nullptr;
 
 		RID light_internal;
 		uint64_t version;
@@ -168,7 +168,7 @@ public:
 				MAX_SIZE = 4096
 			};
 			uint32_t usage;
-			uint8_t *memory;
+			uint8_t *memory = nullptr;
 		};
 
 		struct Command {
@@ -185,7 +185,7 @@ public:
 				TYPE_ANIMATION_SLICE,
 			};
 
-			Command *next;
+			Command *next = nullptr;
 			Type type;
 			virtual ~Command() {}
 		};
@@ -305,8 +305,8 @@ public:
 		};
 
 		struct ViewportRender {
-			RenderingServer *owner;
-			void *udata;
+			RenderingServer *owner = nullptr;
+			void *udata = nullptr;
 			Rect2 rect;
 		};
 
@@ -334,22 +334,22 @@ public:
 		RID material;
 		RID skeleton;
 
-		Item *next;
+		Item *next = nullptr;
 
 		struct CopyBackBuffer {
 			Rect2 rect;
 			Rect2 screen_rect;
 			bool full;
 		};
-		CopyBackBuffer *copy_back_buffer;
+		CopyBackBuffer *copy_back_buffer = nullptr;
 
 		Color final_modulate;
 		Transform2D final_transform;
 		Rect2 final_clip_rect;
-		Item *final_clip_owner;
-		Item *material_owner;
-		Item *canvas_group_owner;
-		ViewportRender *vp_render;
+		Item *final_clip_owner = nullptr;
+		Item *material_owner = nullptr;
+		Item *canvas_group_owner = nullptr;
+		ViewportRender *vp_render = nullptr;
 		bool distance_field;
 		bool light_masked;
 
@@ -453,14 +453,14 @@ public:
 			return rect;
 		}
 
-		Command *commands;
-		Command *last_command;
+		Command *commands = nullptr;
+		Command *last_command = nullptr;
 		Vector<CommandBlock> blocks;
 		uint32_t current_block;
 
 		template <class T>
 		T *alloc_command() {
-			T *command;
+			T *command = nullptr;
 			if (commands == nullptr) {
 				// As the most common use case of canvas items is to
 				// use only one command, the first is done with it's
@@ -590,7 +590,7 @@ public:
 		bool sdf_collision;
 		RS::CanvasOccluderPolygonCullMode cull_cache;
 
-		LightOccluderInstance *next;
+		LightOccluderInstance *next = nullptr;
 
 		LightOccluderInstance() {
 			enabled = true;
diff --git a/servers/rendering/renderer_rd/forward_clustered/render_forward_clustered.h b/servers/rendering/renderer_rd/forward_clustered/render_forward_clustered.h
index 11016968edaa..37366d3e1475 100644
--- a/servers/rendering/renderer_rd/forward_clustered/render_forward_clustered.h
+++ b/servers/rendering/renderer_rd/forward_clustered/render_forward_clustered.h
@@ -332,7 +332,7 @@ class RenderForwardClustered : public RendererSceneRenderRD {
 		uint32_t instance_buffer_size[RENDER_LIST_MAX] = { 0, 0, 0 };
 		LocalVector<InstanceData> instance_data[RENDER_LIST_MAX];
 
-		LightmapCaptureData *lightmap_captures;
+		LightmapCaptureData *lightmap_captures = nullptr;
 		uint32_t max_lightmap_captures;
 		RID lightmap_capture_buffer;
 
diff --git a/servers/rendering/renderer_rd/forward_clustered/scene_shader_forward_clustered.h b/servers/rendering/renderer_rd/forward_clustered/scene_shader_forward_clustered.h
index c3039e2f7fc0..1b7709bedb11 100644
--- a/servers/rendering/renderer_rd/forward_clustered/scene_shader_forward_clustered.h
+++ b/servers/rendering/renderer_rd/forward_clustered/scene_shader_forward_clustered.h
@@ -42,7 +42,7 @@ private:
 	static SceneShaderForwardClustered *singleton;
 
 public:
-	RendererStorageRD *storage;
+	RendererStorageRD *storage = nullptr;
 
 	enum ShaderVersion {
 		SHADER_VERSION_DEPTH_PASS,
@@ -199,7 +199,7 @@ public:
 	}
 
 	struct MaterialData : public RendererRD::MaterialData {
-		ShaderData *shader_data;
+		ShaderData *shader_data = nullptr;
 		RID uniform_set;
 		uint64_t last_pass = 0;
 		uint32_t index = 0;
diff --git a/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.h b/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.h
index 6162ca55af66..0ddfe89eea59 100644
--- a/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.h
+++ b/servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.h
@@ -328,7 +328,7 @@ protected:
 		uint32_t max_lightmaps;
 		RID lightmap_buffer;
 
-		LightmapCaptureData *lightmap_captures;
+		LightmapCaptureData *lightmap_captures = nullptr;
 		uint32_t max_lightmap_captures;
 		RID lightmap_capture_buffer;
 
diff --git a/servers/rendering/renderer_rd/forward_mobile/scene_shader_forward_mobile.h b/servers/rendering/renderer_rd/forward_mobile/scene_shader_forward_mobile.h
index 0f5017dba103..b89fe908d3c9 100644
--- a/servers/rendering/renderer_rd/forward_mobile/scene_shader_forward_mobile.h
+++ b/servers/rendering/renderer_rd/forward_mobile/scene_shader_forward_mobile.h
@@ -40,7 +40,7 @@ namespace RendererSceneRenderImplementation {
 class SceneShaderForwardMobile {
 private:
 	static SceneShaderForwardMobile *singleton;
-	RendererStorageRD *storage;
+	RendererStorageRD *storage = nullptr;
 
 public:
 	enum ShaderVersion {
@@ -163,7 +163,7 @@ public:
 	}
 
 	struct MaterialData : public RendererRD::MaterialData {
-		ShaderData *shader_data;
+		ShaderData *shader_data = nullptr;
 		RID uniform_set;
 		uint64_t last_pass = 0;
 		uint32_t index = 0;
diff --git a/servers/rendering/renderer_rd/pipeline_cache_rd.h b/servers/rendering/renderer_rd/pipeline_cache_rd.h
index 8d82480b38f2..1e80381d88f1 100644
--- a/servers/rendering/renderer_rd/pipeline_cache_rd.h
+++ b/servers/rendering/renderer_rd/pipeline_cache_rd.h
@@ -57,7 +57,7 @@ class PipelineCacheRD {
 		RID pipeline;
 	};
 
-	Version *versions;
+	Version *versions = nullptr;
 	uint32_t version_count;
 
 	RID _generate_version(RD::VertexFormatID p_vertex_format_id, RD::FramebufferFormatID p_framebuffer_format_id, bool p_wireframe, uint32_t p_render_pass, uint32_t p_bool_specializations = 0);
diff --git a/servers/rendering/renderer_rd/renderer_canvas_render_rd.h b/servers/rendering/renderer_rd/renderer_canvas_render_rd.h
index b33ee3fbfea5..6448e1a6648b 100644
--- a/servers/rendering/renderer_rd/renderer_canvas_render_rd.h
+++ b/servers/rendering/renderer_rd/renderer_canvas_render_rd.h
@@ -41,7 +41,7 @@
 #include "servers/rendering/shader_compiler.h"
 
 class RendererCanvasRenderRD : public RendererCanvasRender {
-	RendererStorageRD *storage;
+	RendererStorageRD *storage = nullptr;
 
 	enum {
 		BASE_UNIFORM_SET = 0,
@@ -200,7 +200,7 @@ class RendererCanvasRenderRD : public RendererCanvasRender {
 	}
 
 	struct CanvasMaterialData : public RendererRD::MaterialData {
-		CanvasShaderData *shader_data;
+		CanvasShaderData *shader_data = nullptr;
 		RID uniform_set;
 
 		virtual void set_render_priority(int p_priority) {}
@@ -361,7 +361,7 @@ class RendererCanvasRenderRD : public RendererCanvasRender {
 			uint32_t pad2;
 		};
 
-		LightUniform *light_uniforms;
+		LightUniform *light_uniforms = nullptr;
 
 		RID lights_uniform_buffer;
 		RID canvas_state_buffer;
diff --git a/servers/rendering/renderer_rd/renderer_compositor_rd.h b/servers/rendering/renderer_rd/renderer_compositor_rd.h
index f8bcd81fd7a7..542cff015999 100644
--- a/servers/rendering/renderer_rd/renderer_compositor_rd.h
+++ b/servers/rendering/renderer_rd/renderer_compositor_rd.h
@@ -48,15 +48,15 @@
 
 class RendererCompositorRD : public RendererCompositor {
 protected:
-	UniformSetCacheRD *uniform_set_cache;
-	RendererCanvasRenderRD *canvas;
+	UniformSetCacheRD *uniform_set_cache = nullptr;
+	RendererCanvasRenderRD *canvas = nullptr;
 	RendererRD::CanvasTextureStorage *canvas_texture_storage;
 	RendererRD::MaterialStorage *material_storage;
 	RendererRD::MeshStorage *mesh_storage;
 	RendererRD::TextureStorage *texture_storage;
 	RendererRD::DecalAtlasStorage *decal_atlas_storage;
-	RendererStorageRD *storage;
-	RendererSceneRenderRD *scene;
+	RendererStorageRD *storage = nullptr;
+	RendererSceneRenderRD *scene = nullptr;
 
 	enum BlitMode {
 		BLIT_MODE_NORMAL,
diff --git a/servers/rendering/renderer_rd/renderer_scene_gi_rd.h b/servers/rendering/renderer_rd/renderer_scene_gi_rd.h
index d51b1bf691f2..ed60bc436210 100644
--- a/servers/rendering/renderer_rd/renderer_scene_gi_rd.h
+++ b/servers/rendering/renderer_rd/renderer_scene_gi_rd.h
@@ -55,7 +55,7 @@ class RendererSceneRenderRD;
 
 class RendererSceneGIRD {
 private:
-	RendererStorageRD *storage;
+	RendererStorageRD *storage = nullptr;
 
 	/* VOXEL_GI INSTANCE */
 
@@ -331,8 +331,8 @@ public:
 
 	struct VoxelGIInstance {
 		// access to our containers
-		RendererStorageRD *storage;
-		RendererSceneGIRD *gi;
+		RendererStorageRD *storage = nullptr;
+		RendererSceneGIRD *gi = nullptr;
 
 		RID probe;
 		RID texture;
@@ -455,8 +455,8 @@ public:
 		};
 
 		// access to our containers
-		RendererStorageRD *storage;
-		RendererSceneGIRD *gi;
+		RendererStorageRD *storage = nullptr;
+		RendererSceneGIRD *gi = nullptr;
 
 		// used for rendering (voxelization)
 		RID render_albedo;
diff --git a/servers/rendering/renderer_rd/renderer_scene_render_rd.h b/servers/rendering/renderer_rd/renderer_scene_render_rd.h
index 77c0437e8318..b2c8daffb1af 100644
--- a/servers/rendering/renderer_rd/renderer_scene_render_rd.h
+++ b/servers/rendering/renderer_rd/renderer_scene_render_rd.h
@@ -92,7 +92,7 @@ class RendererSceneRenderRD : public RendererSceneRender {
 	friend RendererSceneGIRD;
 
 protected:
-	RendererStorageRD *storage;
+	RendererStorageRD *storage = nullptr;
 	double time;
 	double time_step = 0;
 
@@ -314,10 +314,10 @@ private:
 	float shadows_quality_radius = 1.0;
 	float directional_shadow_quality_radius = 1.0;
 
-	float *directional_penumbra_shadow_kernel;
-	float *directional_soft_shadow_kernel;
-	float *penumbra_shadow_kernel;
-	float *soft_shadow_kernel;
+	float *directional_penumbra_shadow_kernel = nullptr;
+	float *directional_soft_shadow_kernel = nullptr;
+	float *penumbra_shadow_kernel = nullptr;
+	float *soft_shadow_kernel = nullptr;
 	int directional_penumbra_shadow_samples = 0;
 	int directional_soft_shadow_samples = 0;
 	int penumbra_shadow_samples = 0;
@@ -705,27 +705,27 @@ private:
 		template <class T>
 		struct InstanceSort {
 			float depth;
-			T *instance;
+			T *instance = nullptr;
 			bool operator<(const InstanceSort &p_sort) const {
 				return depth < p_sort.depth;
 			}
 		};
 
-		ReflectionData *reflections;
+		ReflectionData *reflections = nullptr;
 		InstanceSort<ReflectionProbeInstance> *reflection_sort;
 		uint32_t max_reflections;
 		RID reflection_buffer;
 		uint32_t max_reflection_probes_per_instance;
 		uint32_t reflection_count = 0;
 
-		DecalData *decals;
+		DecalData *decals = nullptr;
 		InstanceSort<DecalInstance> *decal_sort;
 		uint32_t max_decals;
 		RID decal_buffer;
 		uint32_t decal_count;
 
-		LightData *omni_lights;
-		LightData *spot_lights;
+		LightData *omni_lights = nullptr;
+		LightData *spot_lights = nullptr;
 
 		InstanceSort<LightInstance> *omni_light_sort;
 		InstanceSort<LightInstance> *spot_light_sort;
@@ -735,7 +735,7 @@ private:
 		uint32_t omni_light_count = 0;
 		uint32_t spot_light_count = 0;
 
-		DirectionalLightData *directional_lights;
+		DirectionalLightData *directional_lights = nullptr;
 		uint32_t max_directional_lights;
 		RID directional_light_buffer;
 
@@ -938,7 +938,7 @@ private:
 	};
 
 	struct FogMaterialData : public RendererRD::MaterialData {
-		FogShaderData *shader_data;
+		FogShaderData *shader_data = nullptr;
 		RID uniform_set;
 		bool uniform_set_updated;
 
diff --git a/servers/rendering/renderer_rd/renderer_scene_sky_rd.h b/servers/rendering/renderer_rd/renderer_scene_sky_rd.h
index 7a3e545addf2..010e2178a914 100644
--- a/servers/rendering/renderer_rd/renderer_scene_sky_rd.h
+++ b/servers/rendering/renderer_rd/renderer_scene_sky_rd.h
@@ -63,7 +63,7 @@ public:
 	};
 
 private:
-	RendererStorageRD *storage;
+	RendererStorageRD *storage = nullptr;
 	RD::DataFormat texture_format = RD::DATA_FORMAT_R16G16B16A16_SFLOAT;
 
 	RID index_buffer;
@@ -162,8 +162,8 @@ public:
 
 		UBO ubo;
 
-		SkyDirectionalLightData *directional_lights;
-		SkyDirectionalLightData *last_frame_directional_lights;
+		SkyDirectionalLightData *directional_lights = nullptr;
+		SkyDirectionalLightData *last_frame_directional_lights = nullptr;
 		uint32_t max_directional_lights;
 		uint32_t last_frame_directional_light_count;
 		RID directional_light_buffer;
@@ -228,7 +228,7 @@ public:
 	} sky_shader;
 
 	struct SkyMaterialData : public RendererRD::MaterialData {
-		SkyShaderData *shader_data;
+		SkyShaderData *shader_data = nullptr;
 		RID uniform_set;
 		bool uniform_set_updated;
 
@@ -262,7 +262,7 @@ public:
 		Sky *dirty_list = nullptr;
 
 		//State to track when radiance cubemap needs updating
-		SkyMaterialData *prev_material;
+		SkyMaterialData *prev_material = nullptr;
 		Vector3 prev_position;
 		float prev_time;
 
diff --git a/servers/rendering/renderer_rd/storage_rd/material_storage.h b/servers/rendering/renderer_rd/storage_rd/material_storage.h
index 69b7b702b060..270d9f0982cb 100644
--- a/servers/rendering/renderer_rd/storage_rd/material_storage.h
+++ b/servers/rendering/renderer_rd/storage_rd/material_storage.h
@@ -73,7 +73,7 @@ typedef ShaderData *(*ShaderDataRequestFunction)();
 struct Material;
 
 struct Shader {
-	ShaderData *data;
+	ShaderData *data = nullptr;
 	String code;
 	ShaderType type;
 	Map<StringName, Map<int, RID>> default_texture_parameter;
@@ -177,9 +177,9 @@ struct GlobalVariables {
 	List<RID> materials_using_texture;
 
 	RID buffer;
-	Value *buffer_values;
-	ValueUsage *buffer_usage;
-	bool *buffer_dirty_regions;
+	Value *buffer_values = nullptr;
+	ValueUsage *buffer_usage = nullptr;
+	bool *buffer_dirty_regions = nullptr;
 	uint32_t buffer_dirty_region_count = 0;
 
 	uint32_t buffer_size;
diff --git a/servers/rendering/renderer_rd/storage_rd/mesh_storage.h b/servers/rendering/renderer_rd/storage_rd/mesh_storage.h
index 8806a2a35812..e8da8ad563e0 100644
--- a/servers/rendering/renderer_rd/storage_rd/mesh_storage.h
+++ b/servers/rendering/renderer_rd/storage_rd/mesh_storage.h
@@ -149,7 +149,7 @@ struct Mesh {
 /* Mesh Instance */
 
 struct MeshInstance {
-	Mesh *mesh;
+	Mesh *mesh = nullptr;
 	RID skeleton;
 	struct Surface {
 		RID vertex_buffer;
diff --git a/servers/rendering/renderer_scene_cull.h b/servers/rendering/renderer_scene_cull.h
index 21121186735b..5f71250ced7a 100644
--- a/servers/rendering/renderer_scene_cull.h
+++ b/servers/rendering/renderer_scene_cull.h
@@ -47,7 +47,7 @@
 
 class RendererSceneCull : public RendererScene {
 public:
-	RendererSceneRender *scene_render;
+	RendererSceneRender *scene_render = nullptr;
 
 	enum {
 		SDFGI_MAX_CASCADES = 8,
@@ -115,7 +115,7 @@ public:
 
 	/* VISIBILITY NOTIFIER API */
 
-	RendererSceneOcclusionCull *dummy_occlusion_culling;
+	RendererSceneOcclusionCull *dummy_occlusion_culling = nullptr;
 
 	/* SCENARIO API */
 
@@ -273,7 +273,7 @@ public:
 		union {
 			uint64_t instance_data_rid;
 			RendererSceneRender::GeometryInstance *instance_geometry;
-			InstanceVisibilityNotifierData *visibility_notifier;
+			InstanceVisibilityNotifierData *visibility_notifier = nullptr;
 		};
 		Instance *instance = nullptr;
 		int32_t parent_array_index = -1;
@@ -365,8 +365,8 @@ public:
 	/* INSTANCING API */
 
 	struct InstancePair {
-		Instance *a;
-		Instance *b;
+		Instance *a = nullptr;
+		Instance *b = nullptr;
 		SelfList<InstancePair> list_a;
 		SelfList<InstancePair> list_b;
 		InstancePair() :
@@ -409,7 +409,7 @@ public:
 		bool dynamic_gi : 2; //same above for dynamic objects
 		bool redraw_if_visible : 4;
 
-		Instance *lightmap;
+		Instance *lightmap = nullptr;
 		Rect2 lightmap_uv_scale;
 		int lightmap_slice_index;
 		uint32_t lightmap_cull_index;
@@ -455,7 +455,7 @@ public:
 
 		SelfList<Instance> update_item;
 
-		AABB *custom_aabb; // <Zylann> would using aabb directly with a bool be better?
+		AABB *custom_aabb = nullptr; // <Zylann> would using aabb directly with a bool be better?
 		float extra_margin;
 		ObjectID object_id;
 
@@ -465,7 +465,7 @@ public:
 
 		uint64_t version; // changes to this, and changes to base increase version
 
-		InstanceBaseData *base_data;
+		InstanceBaseData *base_data = nullptr;
 
 		SelfList<InstancePair>::List pairs;
 		uint64_t pair_check;
@@ -597,7 +597,7 @@ public:
 	};
 
 	struct InstanceReflectionProbeData : public InstanceBaseData {
-		Instance *owner;
+		Instance *owner = nullptr;
 
 		Set<Instance *> geometries;
 
@@ -613,7 +613,7 @@ public:
 	};
 
 	struct InstanceDecalData : public InstanceBaseData {
-		Instance *owner;
+		Instance *owner = nullptr;
 		RID instance;
 
 		Set<Instance *> geometries;
@@ -656,7 +656,7 @@ public:
 
 		Set<Instance *> geometries;
 
-		Instance *baked_light;
+		Instance *baked_light = nullptr;
 
 		RS::LightBakeMode bake_mode;
 		uint32_t max_sdfgi_cascade = 2;
@@ -671,7 +671,7 @@ public:
 	};
 
 	struct InstanceVoxelGIData : public InstanceBaseData {
-		Instance *owner;
+		Instance *owner = nullptr;
 
 		Set<Instance *> geometries;
 		Set<Instance *> dynamic_geometries;
@@ -1023,7 +1023,7 @@ public:
 
 	struct VisibilityCullData {
 		uint64_t viewport_mask;
-		Scenario *scenario;
+		Scenario *scenario = nullptr;
 		Vector3 camera_position;
 		uint32_t cull_offset;
 		uint32_t cull_count;
@@ -1035,12 +1035,12 @@ public:
 	_FORCE_INLINE_ int _visibility_range_check(InstanceVisibilityData &r_vis_data, const Vector3 &p_camera_pos, uint64_t p_viewport_mask);
 
 	struct CullData {
-		Cull *cull;
-		Scenario *scenario;
+		Cull *cull = nullptr;
+		Scenario *scenario = nullptr;
 		RID shadow_atlas;
 		Transform3D cam_transform;
 		uint32_t visible_layers;
-		Instance *render_reflection_probe;
+		Instance *render_reflection_probe = nullptr;
 		const RendererSceneOcclusionCull::HZBuffer *occlusion_buffer;
 		const CameraMatrix *camera_matrix;
 		uint64_t visibility_viewport_mask;
diff --git a/servers/rendering/renderer_scene_render.h b/servers/rendering/renderer_scene_render.h
index 5f9c4bb81634..0b8734e68c7d 100644
--- a/servers/rendering/renderer_scene_render.h
+++ b/servers/rendering/renderer_scene_render.h
@@ -223,7 +223,7 @@ public:
 	struct RenderSDFGIUpdateData {
 		bool update_static = false;
 		uint32_t static_cascade_count;
-		uint32_t *static_cascade_indices;
+		uint32_t *static_cascade_indices = nullptr;
 		PagedArray<RID> *static_positional_lights;
 
 		const Vector<RID> *directional_lights;
diff --git a/servers/rendering/renderer_viewport.h b/servers/rendering/renderer_viewport.h
index 2245d9a2163e..b6e44e84368d 100644
--- a/servers/rendering/renderer_viewport.h
+++ b/servers/rendering/renderer_viewport.h
@@ -129,7 +129,7 @@ public:
 		};
 
 		struct CanvasData {
-			CanvasBase *canvas;
+			CanvasBase *canvas = nullptr;
 			Transform2D transform;
 			int layer;
 			int sublayer;
diff --git a/servers/rendering/shader_language.h b/servers/rendering/shader_language.h
index e5ac14a7dbcb..25ec8760af48 100644
--- a/servers/rendering/shader_language.h
+++ b/servers/rendering/shader_language.h
@@ -386,7 +386,7 @@ public:
 		return node;
 	}
 
-	Node *nodes;
+	Node *nodes = nullptr;
 
 	struct OperatorNode : public Node {
 		DataType return_cache = TYPE_VOID;
@@ -615,20 +615,20 @@ public:
 			DataType type;
 			StringName type_str;
 			DataPrecision precision;
-			ConstantNode *initializer;
+			ConstantNode *initializer = nullptr;
 			int array_size;
 		};
 
 		struct Function {
 			StringName name;
-			FunctionNode *function;
+			FunctionNode *function = nullptr;
 			Set<StringName> uses_function;
 			bool callable;
 		};
 
 		struct Struct {
 			StringName name;
-			StructNode *shader_struct;
+			StructNode *shader_struct = nullptr;
 		};
 
 		struct Varying {
@@ -715,7 +715,7 @@ public:
 		bool is_op;
 		union {
 			Operator op;
-			Node *node;
+			Node *node = nullptr;
 		};
 	};
 
@@ -973,7 +973,7 @@ private:
 	Token _make_token(TokenType p_type, const StringName &p_text = StringName());
 	Token _get_token();
 
-	ShaderNode *shader;
+	ShaderNode *shader = nullptr;
 
 	enum IdentifierType {
 		IDENTIFIER_FUNCTION,
@@ -1021,7 +1021,7 @@ private:
 
 	CompletionType completion_type;
 	int completion_line;
-	BlockNode *completion_block;
+	BlockNode *completion_block = nullptr;
 	DataType completion_base;
 	bool completion_base_array;
 	SubClassTag completion_class;
diff --git a/tests/core/math/test_geometry_3d.h b/tests/core/math/test_geometry_3d.h
index 1b8d2eee3458..99a4ef2d46ec 100644
--- a/tests/core/math/test_geometry_3d.h
+++ b/tests/core/math/test_geometry_3d.h
@@ -288,7 +288,7 @@ TEST_CASE("[Geometry3D] Is Point in Projected Triangle") {
 TEST_CASE("[Geometry3D] Does Ray Intersect Triangle") {
 	struct Case {
 		Vector3 from, direction, v_1, v_2, v_3;
-		Vector3 *result;
+		Vector3 *result = nullptr;
 		bool want;
 		Case(){};
 		Case(Vector3 p_from, Vector3 p_direction, Vector3 p_v_1, Vector3 p_v_2, Vector3 p_v_3, bool p_want) :
@@ -390,7 +390,7 @@ TEST_CASE("[Geometry3D] Triangle and Box Overlap") {
 	struct Case {
 		Vector3 box_centre;
 		Vector3 box_half_size;
-		Vector3 *tri_verts;
+		Vector3 *tri_verts = nullptr;
 		bool want;
 		Case(){};
 		Case(Vector3 p_centre, Vector3 p_half_size, Vector3 *p_verts, bool p_want) :