VRoid Studio does not use the Unlit shaders in UniVRM (UnlitCutout, UnlitTransparent, UnlitTransparentZWrite).
Since VRoid Studio uses MToon, you can use MToon's alpha channel modes (Cutout, Transparent, TransparentZWrite) in combination with MToon's alpha channel modes (some modes are not supported, e.g. Opaque).
- Body skin
- Iris highlights
- Base Hair
- Face skin
- Inner mouth
The Opaque items become darker as the value of the alpha channel is reduced (pre-multiplied alpha).
You can use UniVRM's Unlit shaders on VRoid Hub, but just like in Studio, the parts in Opaque mode will be darker.