This is Ferret Mommy! intended to be used in VRChat, she is made up of: 64,352 tris 5 materials 1 skinned mesh
That makes her a "good" avatar, although she does go up to a medium depending on if you want to go all out with the dynamic bones, I'll leave that up to you.
In the download are contained: a .blend and .fbx file of the avatar, the textures, as well as a unity package for convenience.
You should be able to import the package in your project, and drag and drop the prefab into your scene. The prefab comes with all of the materials, bone constraints, VRC avatar components, and dynamic bones already set up.
You should have the VRChat SDK, Dynamic Bone, and Poiyomi shader already imported into your project, or you may get an error about missing scripts.
You're free to edit it however you like and upload a version of your own, but please don't upload it as a public avatar, sell, or re-distribute it in any way.
If you have ideas or suggestions for me, or need help customizing or uploading the avatar don't hesitate to shoot me a message on discord!