The shader requires that your unity project use the built-in render pipeline as well as setting the color space to linear rather than gamma. You can change the color space setting here: Edit > Project Settings > Player > Other Settings > Color Space

To ensure the shader works properly textures have specific import settings:

Texture	sRGB	Non-Power of 2 Scaling	Generate Mip Maps	Wrap Mode	Compression
Diffuse	On	Leave as is	Off	Repeat	Off
Light Maps	Off	Leave as is	Off	Repeat	Off
Stockings	Off	Leave as is	Off	Repeat	Off
Shadow Ramps	On	Leave as is	Off	Clamp	Off
Specular Ramps	Off	Leave as is	Off	Clamp	Off
Normal Maps	Off	Leave as is	Off	Repeat	Off
Metal Maps	On	Leave as is	Off	Repeat	Off
MaterialIDValuesLUT	Off	None	Off	Repeat	Off
Weapon Pattern (Eff_WeaponsTotem_Grain_00.png)	Off	Leave as is	Off	Repeat	Off
Weapon Dissolve (Eff_WeaponsTotem_Dissolve_00.png)	Off	Leave as is	Off	Clamp	Off
Scan Pattern (Eff_Gradient_Repeat_01.png)	Off	Leave as is	Off	Repeat	Off

Both Genshin and Star Rail often use a secondary set of normals as the outline factor. Along side the shader, there is a script for generating them and storing them inside the tangent data block.

HoyoToon_GeneratingTangents.mp4

To make sure that your model keeps their rim lights intact when entering all worlds in VRChat, you will need to attach a directional light to your character model. You can do this by dragging and dropping the AvatarLight prefab onto your model. You can find this prefab in the Dependencies folder.

This is only accurate for datamined assets.

Hoyoverse models require a simple setting changes to make sure the shading and everything is will work correctly. If you do not set the correct settings many things such as rimlights and outlines may not work correctly. Make sure to set the following settings on your FBX import settings:

• Scale Factor: 100
• Read/Write: Enabled This way you will have your generated tangents mesh inherit it.
• Legacy Blend Shape Normals: On Apply all changes.

FBX.Import.Settings.mp4