The mod "Common prototypes" seems like a great idea but it is very clearly not controlled well enough to function, the last update it received 5 months ago and it breaks every character mod I have seen, the issue is that a mod that is meant to be a connector between others breaks them so something needs to be fixed here or at least there should be clearly stated that it breaks character mods

Well since this seemingly huge issue seems to not be a big concern guess I'll try to break the mod until it finally works the way it was meant to work

You make a good point. When I have time, maybe I'll remove it. I made it with high hopes, but it hasn't been well received.
I don't think it's common prototypes causing the bug, but I am aware of the custom character model bug.