How do we make skin mod without texmod ?

[Rizonza]

I've seen some people made skin mod with a file overwrite method, But it seem to be only models swap atm
however there's the shirtless dante mod, which I believe the model doesn't exist in the game yet it have the file overwrite method.
Bonus question : Where can I find character models ? Like what folder do they belong to and how do i open them ?