Avatars
The following are some useful resources for creating and customizing avatars:
Creators
Character Studio by M3
Open source web based custom VRM avatar creation platform
Union Avatars
Create custom avatars for virtual worlds and social platforms
VRoid Studio
Create and customize 3D avatars in anime style
VKET Avatar Maker
Easy-to-use avatar creation platform
Marketplaces
VRoid Hub
Platform to share and discover VRM avatars
Collections
Wassies (CC0)
Collection of CC0 licensed avatar assets
Bunker Bunnies
Avatar collection by neonglitch86
Tools
Convert DCL Avatar to VRM
Tutorial: Converting Decentraland avatars to VRM format
RTFKT Clone Tools 2.0
Extension packs for automatic animation and posing of clones (+1500 poses)
Guides
Creating Avatars with VRM Assets | Mona
Guide to creating custom avatars using VRM assets by Mona.
Making emotes for NPCs
Emotes are used to express emotions through character actions.
Using ‘VRM for Blender’ for Rigging | Mona
Rigging VRMs in Blender
Blender A-pose to T-pose
Another way as suggested in Discord/showcase
Once rigged select your skeleton/armature and then enter into pose mode. Move the arms up until they are out strait in a t pose. Then in your VRM Operator setting change T-Pose from Rest Position to Current Pose and export