Is it possible to use a character in workspace directly repalce another character?
We're talking about Charastudio, right?
In the card loading section, the following options appear:
Confirm - Load the card without further ado
Change Character - This is what you're looking for; select the model in the scene and load it with this option
Change Only Body - Basically, it only changes the body, but I don't know if it uses the same shader and masks as the original body
If you're talking about
Koikatsu (the game

), then I'm really not sure.
Of course I finally do updates and everything breaks
I keep getting this message, I've tried 4 different versions of KKUTS, character clothes stop showing up or just show as a static color, and shaders also mess up
Did you update both the mod and the KKUTS plugin located in the BepInex/plugin folder?
This usually happens due to the same incompatibility issue, or because you're also using an outdated KKUTS configuration (it's trying to load shaders from older versions, not the one you have). In that case, you could delete KKUTS.cfg to generate a new one on startup.
I'd even suggest clearing the cache, but I'm not sure if that will help.