I don't think a character's class has anything to do with their graphic. For instance, you can have multiple actors assigned to the same class, but they will still keep their own graphics. If you want to change it, I suggest using a command called "Change Route" or "Edit Route," whatever it's called. (I forget the exact name for it on XP, and I don't realy know if it appears in 2K) Anyway, besides using this command to set up an actor's route, it can be used to change their graphic. Try looking into that.