diff --git a/discord/abc.py b/discord/abc.py
index b94f9a717..df43dae52 100644
--- a/discord/abc.py
+++ b/discord/abc.py
@@ -26,7 +26,21 @@ from __future__ import annotations
 
 import copy
 import asyncio
-from typing import Any, Dict, List, Mapping, Optional, TYPE_CHECKING, Protocol, Type, TypeVar, Union, overload, runtime_checkable
+from typing import (
+    Any,
+    Dict,
+    List,
+    Mapping,
+    Optional,
+    TYPE_CHECKING,
+    Protocol,
+    Tuple,
+    Type,
+    TypeVar,
+    Union,
+    overload,
+    runtime_checkable,
+)
 
 from .iterators import HistoryIterator
 from .context_managers import Typing
@@ -62,16 +76,24 @@ if TYPE_CHECKING:
     from .channel import CategoryChannel
     from .embeds import Embed
     from .message import Message, MessageReference
+    from .channel import TextChannel, DMChannel, GroupChannel
+    from .threads import Thread
     from .enums import InviteTarget
     from .ui.view import View
+    from .types.channel import (
+        PermissionOverwrite as PermissionOverwritePayload,
+        GuildChannel as GuildChannelPayload,
+        OverwriteType,
+    )
 
+    MessageableChannel = Union[TextChannel, Thread, DMChannel, GroupChannel]
     SnowflakeTime = Union["Snowflake", datetime]
 
 MISSING = utils.MISSING
 
 
 class _Undefined:
-    def __repr__(self):
+    def __repr__(self) -> str:
         return 'see-below'
 
 
@@ -102,6 +124,7 @@ class Snowflake(Protocol):
         """:class:`datetime.datetime`: Returns the model's creation time as an aware datetime in UTC."""
         raise NotImplementedError
 
+
 @runtime_checkable
 class User(Snowflake, Protocol):
     """An ABC that details the common operations on a Discord user.
@@ -172,13 +195,13 @@ class _Overwrites:
     ROLE = 0
     MEMBER = 1
 
-    def __init__(self, **kwargs):
-        self.id = kwargs.pop('id')
-        self.allow = int(kwargs.pop('allow', 0))
-        self.deny = int(kwargs.pop('deny', 0))
-        self.type = kwargs.pop('type')
+    def __init__(self, data: PermissionOverwritePayload):
+        self.id: int = int(data.pop('id'))
+        self.allow: int = int(data.pop('allow', 0))
+        self.deny: int = int(data.pop('deny', 0))
+        self.type: OverwriteType = data.pop('type')
 
-    def _asdict(self):
+    def _asdict(self) -> PermissionOverwritePayload:
         return {
             'id': self.id,
             'allow': str(self.allow),
@@ -208,11 +231,6 @@ class GuildChannel:
 
     This ABC must also implement :class:`~discord.abc.Snowflake`.
 
-    Note
-    ----
-    This ABC is not decorated with :func:`typing.runtime_checkable`, so will fail :func:`isinstance`/:func:`issubclass`
-    checks.
-
     Attributes
     -----------
     name: :class:`str`
@@ -230,7 +248,10 @@ class GuildChannel:
     name: str
     guild: Guild
     type: ChannelType
+    position: int
+    category_id: Optional[int]
     _state: ConnectionState
+    _overwrites: List[_Overwrites]
 
     if TYPE_CHECKING:
 
@@ -254,13 +275,13 @@ class GuildChannel:
         lock_permissions: bool = False,
         *,
         reason: Optional[str],
-    ):
+    ) -> None:
         if position < 0:
             raise InvalidArgument('Channel position cannot be less than 0.')
 
         http = self._state.http
         bucket = self._sorting_bucket
-        channels = [c for c in self.guild.channels if c._sorting_bucket == bucket]
+        channels: List[GuildChannel] = [c for c in self.guild.channels if c._sorting_bucket == bucket]
 
         channels.sort(key=lambda c: c.position)
 
@@ -277,7 +298,7 @@ class GuildChannel:
 
         payload = []
         for index, c in enumerate(channels):
-            d = {'id': c.id, 'position': index}
+            d: Dict[str, Any] = {'id': c.id, 'position': index}
             if parent_id is not _undefined and c.id == self.id:
                 d.update(parent_id=parent_id, lock_permissions=lock_permissions)
             payload.append(d)
@@ -287,7 +308,7 @@ class GuildChannel:
         if parent_id is not _undefined:
             self.category_id = int(parent_id) if parent_id else None
 
-    async def _edit(self, options, reason):
+    async def _edit(self, options: Dict[str, Any], reason: Optional[str]):
         try:
             parent = options.pop('category')
         except KeyError:
@@ -322,13 +343,15 @@ class GuildChannel:
             if parent_id is not _undefined:
                 if lock_permissions:
                     category = self.guild.get_channel(parent_id)
-                    options['permission_overwrites'] = [c._asdict() for c in category._overwrites]
+                    if category:
+                        options['permission_overwrites'] = [c._asdict() for c in category._overwrites]
                 options['parent_id'] = parent_id
             elif lock_permissions and self.category_id is not None:
                 # if we're syncing permissions on a pre-existing channel category without changing it
                 # we need to update the permissions to point to the pre-existing category
                 category = self.guild.get_channel(self.category_id)
-                options['permission_overwrites'] = [c._asdict() for c in category._overwrites]
+                if category:
+                    options['permission_overwrites'] = [c._asdict() for c in category._overwrites]
         else:
             await self._move(position, parent_id=parent_id, lock_permissions=lock_permissions, reason=reason)
 
@@ -367,19 +390,19 @@ class GuildChannel:
             data = await self._state.http.edit_channel(self.id, reason=reason, **options)
             self._update(self.guild, data)
 
-    def _fill_overwrites(self, data):
+    def _fill_overwrites(self, data: GuildChannelPayload) -> None:
         self._overwrites = []
         everyone_index = 0
         everyone_id = self.guild.id
 
         for index, overridden in enumerate(data.get('permission_overwrites', [])):
-            overridden_id = int(overridden.pop('id'))
-            self._overwrites.append(_Overwrites(id=overridden_id, **overridden))
+            overwrite = _Overwrites(overridden)
+            self._overwrites.append(overwrite)
 
             if overridden['type'] == _Overwrites.MEMBER:
                 continue
 
-            if overridden_id == everyone_id:
+            if overwrite.id == everyone_id:
                 # the @everyone role is not guaranteed to be the first one
                 # in the list of permission overwrites, however the permission
                 # resolution code kind of requires that it is the first one in
@@ -488,7 +511,7 @@ class GuildChannel:
 
         If there is no category then this is ``None``.
         """
-        return self.guild.get_channel(self.category_id)
+        return self.guild.get_channel(self.category_id)  # type: ignore
 
     @property
     def permissions_synced(self) -> bool:
@@ -499,6 +522,9 @@ class GuildChannel:
 
         .. versionadded:: 1.3
         """
+        if self.category_id is None:
+            return False
+
         category = self.guild.get_channel(self.category_id)
         return bool(category and category.overwrites == self.overwrites)
 
@@ -679,14 +705,7 @@ class GuildChannel:
     ) -> None:
         ...
 
-    async def set_permissions(
-        self,
-        target,
-        *,
-        overwrite=_undefined,
-        reason=None,
-        **permissions
-    ):
+    async def set_permissions(self, target, *, overwrite=_undefined, reason=None, **permissions):
         r"""|coro|
 
         Sets the channel specific permission overwrites for a target in the
@@ -801,7 +820,7 @@ class GuildChannel:
         obj = cls(state=self._state, guild=self.guild, data=data)
 
         # temporarily add it to the cache
-        self.guild._channels[obj.id] = obj
+        self.guild._channels[obj.id] = obj  # type: ignore
         return obj
 
     async def clone(self: GCH, *, name: Optional[str] = None, reason: Optional[str] = None) -> GCH:
@@ -956,6 +975,7 @@ class GuildChannel:
         bucket = self._sorting_bucket
         parent_id = kwargs.get('category', MISSING)
         # fmt: off
+        channels: List[GuildChannel]
         if parent_id not in (MISSING, None):
             parent_id = parent_id.id
             channels = [
@@ -1017,7 +1037,7 @@ class GuildChannel:
         unique: bool = True,
         target_type: Optional[InviteTarget] = None,
         target_user: Optional[User] = None,
-        target_application_id: Optional[int] = None
+        target_application_id: Optional[int] = None,
     ) -> Invite:
         """|coro|
 
@@ -1045,9 +1065,9 @@ class GuildChannel:
             The reason for creating this invite. Shows up on the audit log.
         target_type: Optional[:class:`.InviteTarget`]
             The type of target for the voice channel invite, if any.
-            
+
             .. versionadded:: 2.0
-        
+
         target_user: Optional[:class:`User`]
             The user whose stream to display for this invite, required if `target_type` is `TargetType.stream`. The user must be streaming in the channel.
 
@@ -1081,7 +1101,7 @@ class GuildChannel:
             unique=unique,
             target_type=target_type.value if target_type else None,
             target_user_id=target_user.id if target_user else None,
-            target_application_id=target_application_id
+            target_application_id=target_application_id,
         )
         return Invite.from_incomplete(data=data, state=self._state)
 
@@ -1111,7 +1131,7 @@ class GuildChannel:
         return [Invite(state=state, data=invite, channel=self, guild=guild) for invite in data]
 
 
-class Messageable(Protocol):
+class Messageable:
     """An ABC that details the common operations on a model that can send messages.
 
     The following implement this ABC:
@@ -1122,28 +1142,57 @@ class Messageable(Protocol):
     - :class:`~discord.User`
     - :class:`~discord.Member`
     - :class:`~discord.ext.commands.Context`
-
-
-    Note
-    ----
-    This ABC is not decorated with :func:`typing.runtime_checkable`, so will fail :func:`isinstance`/:func:`issubclass`
-    checks.
     """
 
     __slots__ = ()
+    _state: ConnectionState
 
-    async def _get_channel(self):
+    async def _get_channel(self) -> MessageableChannel:
         raise NotImplementedError
 
     @overload
     async def send(
         self,
-        content: Optional[str] =...,
+        content: Optional[str] = ...,
         *,
         tts: bool = ...,
         embed: Embed = ...,
         file: File = ...,
-        delete_after: int = ...,
+        delete_after: float = ...,
+        nonce: Union[str, int] = ...,
+        allowed_mentions: AllowedMentions = ...,
+        reference: Union[Message, MessageReference] = ...,
+        mention_author: bool = ...,
+        view: View = ...,
+    ) -> Message:
+        ...
+
+    @overload
+    async def send(
+        self,
+        content: Optional[str] = ...,
+        *,
+        tts: bool = ...,
+        embed: Embed = ...,
+        files: List[File] = ...,
+        delete_after: float = ...,
+        nonce: Union[str, int] = ...,
+        allowed_mentions: AllowedMentions = ...,
+        reference: Union[Message, MessageReference] = ...,
+        mention_author: bool = ...,
+        view: View = ...,
+    ) -> Message:
+        ...
+
+    @overload
+    async def send(
+        self,
+        content: Optional[str] = ...,
+        *,
+        tts: bool = ...,
+        embeds: List[Embed] = ...,
+        file: File = ...,
+        delete_after: float = ...,
         nonce: Union[str, int] = ...,
         allowed_mentions: AllowedMentions = ...,
         reference: Union[Message, MessageReference] = ...,
@@ -1160,7 +1209,7 @@ class Messageable(Protocol):
         tts: bool = ...,
         embeds: List[Embed] = ...,
         files: List[File] = ...,
-        delete_after: int = ...,
+        delete_after: float = ...,
         nonce: Union[str, int] = ...,
         allowed_mentions: AllowedMentions = ...,
         reference: Union[Message, MessageReference] = ...,
@@ -1169,10 +1218,22 @@ class Messageable(Protocol):
     ) -> Message:
         ...
 
-    async def send(self, content=None, *, tts=False, embed=None, embeds=None,
-                                          file=None, files=None, delete_after=None,
-                                          nonce=None, allowed_mentions=None, reference=None,
-                                          mention_author=None, view=None):
+    async def send(
+        self,
+        content=None,
+        *,
+        tts=None,
+        embed=None,
+        embeds=None,
+        file=None,
+        files=None,
+        delete_after=None,
+        nonce=None,
+        allowed_mentions=None,
+        reference=None,
+        mention_author=None,
+        view=None,
+    ):
         """|coro|
 
         Sends a message to the destination with the content given.
@@ -1185,7 +1246,7 @@ class Messageable(Protocol):
         single :class:`~discord.File` object. To upload multiple files, the ``files``
         parameter should be used with a :class:`list` of :class:`~discord.File` objects.
         **Specifying both parameters will lead to an exception**.
-        
+
         To upload a single embed, the ``embed`` parameter should be used with a
         single :class:`~discord.Embed` object. To upload multiple embeds, the ``embeds``
         parameter should be used with a :class:`list` of :class:`~discord.Embed` objects.
@@ -1193,7 +1254,7 @@ class Messageable(Protocol):
 
         Parameters
         ------------
-        content: :class:`str`
+        content: Optional[:class:`str`]
             The content of the message to send.
         tts: :class:`bool`
             Indicates if the message should be sent using text-to-speech.
@@ -1261,13 +1322,13 @@ class Messageable(Protocol):
         channel = await self._get_channel()
         state = self._state
         content = str(content) if content is not None else None
-        
+
         if embed is not None and embeds is not None:
             raise InvalidArgument('cannot pass both embed and embeds parameter to send()')
-   
+
         if embed is not None:
             embed = embed.to_dict()
-        
+
         elif embeds is not None:
             if len(embeds) > 10:
                 raise InvalidArgument('embeds parameter must be a list of up to 10 elements')
@@ -1307,9 +1368,18 @@ class Messageable(Protocol):
                 raise InvalidArgument('file parameter must be File')
 
             try:
-                data = await state.http.send_files(channel.id, files=[file], allowed_mentions=allowed_mentions,
-                                                   content=content, tts=tts, embed=embed, embeds=embeds,
-                                                   nonce=nonce, message_reference=reference, components=components)
+                data = await state.http.send_files(
+                    channel.id,
+                    files=[file],
+                    allowed_mentions=allowed_mentions,
+                    content=content,
+                    tts=tts,
+                    embed=embed,
+                    embeds=embeds,
+                    nonce=nonce,
+                    message_reference=reference,
+                    components=components,
+                )
             finally:
                 file.close()
 
@@ -1320,17 +1390,33 @@ class Messageable(Protocol):
                 raise InvalidArgument('files parameter must be a list of File')
 
             try:
-                data = await state.http.send_files(channel.id, files=files, content=content, tts=tts,
-                                                   embed=embed, embeds=embeds, nonce=nonce,
-                                                   allowed_mentions=allowed_mentions, message_reference=reference,
-                                                   components=components)
+                data = await state.http.send_files(
+                    channel.id,
+                    files=files,
+                    content=content,
+                    tts=tts,
+                    embed=embed,
+                    embeds=embeds,
+                    nonce=nonce,
+                    allowed_mentions=allowed_mentions,
+                    message_reference=reference,
+                    components=components,
+                )
             finally:
                 for f in files:
                     f.close()
         else:
-            data = await state.http.send_message(channel.id, content, tts=tts, embed=embed,
-                                                 embeds=embeds, nonce=nonce, allowed_mentions=allowed_mentions,
-                                                 message_reference=reference, components=components)
+            data = await state.http.send_message(
+                channel.id,
+                content,
+                tts=tts,
+                embed=embed,
+                embeds=embeds,
+                nonce=nonce,
+                allowed_mentions=allowed_mentions,
+                message_reference=reference,
+                components=components,
+            )
 
         ret = state.create_message(channel=channel, data=data)
         if view:
@@ -1340,7 +1426,7 @@ class Messageable(Protocol):
             await ret.delete(delay=delete_after)
         return ret
 
-    async def trigger_typing(self):
+    async def trigger_typing(self) -> None:
         """|coro|
 
         Triggers a *typing* indicator to the destination.
@@ -1351,7 +1437,7 @@ class Messageable(Protocol):
         channel = await self._get_channel()
         await self._state.http.send_typing(channel.id)
 
-    def typing(self):
+    def typing(self) -> Typing:
         """Returns a context manager that allows you to type for an indefinite period of time.
 
         This is useful for denoting long computations in your bot.
@@ -1362,8 +1448,8 @@ class Messageable(Protocol):
             This means that both ``with`` and ``async with`` work with this.
 
         Example Usage: ::
-            async with channel.typing(): 
-                # simulate something heavy 
+            async with channel.typing():
+                # simulate something heavy
                 await asyncio.sleep(10)
 
             await channel.send('done!')
@@ -1371,7 +1457,7 @@ class Messageable(Protocol):
         """
         return Typing(self)
 
-    async def fetch_message(self, id):
+    async def fetch_message(self, id: int, /) -> Message:
         """|coro|
 
         Retrieves a single :class:`~discord.Message` from the destination.
@@ -1400,7 +1486,7 @@ class Messageable(Protocol):
         data = await self._state.http.get_message(channel.id, id)
         return self._state.create_message(channel=channel, data=data)
 
-    async def pins(self):
+    async def pins(self) -> List[Message]:
         """|coro|
 
         Retrieves all messages that are currently pinned in the channel.
@@ -1427,7 +1513,15 @@ class Messageable(Protocol):
         data = await state.http.pins_from(channel.id)
         return [state.create_message(channel=channel, data=m) for m in data]
 
-    def history(self, *, limit=100, before=None, after=None, around=None, oldest_first=None):
+    def history(
+        self,
+        *,
+        limit: Optional[int] = 100,
+        before: Optional[SnowflakeTime] = None,
+        after: Optional[SnowflakeTime] = None,
+        around: Optional[SnowflakeTime] = None,
+        oldest_first: Optional[bool] = None,
+    ) -> HistoryIterator:
         """Returns an :class:`~discord.AsyncIterator` that enables receiving the destination's message history.
 
         You must have :attr:`~discord.Permissions.read_message_history` permissions to use this.
@@ -1504,11 +1598,12 @@ class Connectable(Protocol):
     """
 
     __slots__ = ()
+    _state: ConnectionState
 
-    def _get_voice_client_key(self):
+    def _get_voice_client_key(self) -> Tuple[int, str]:
         raise NotImplementedError
 
-    def _get_voice_state_pair(self):
+    def _get_voice_state_pair(self) -> Tuple[int, int]:
         raise NotImplementedError
 
     async def connect(self, *, timeout: float = 60.0, reconnect: bool = True, cls: Type[T] = VoiceClient) -> T: