Mod Idea: FF1 rebuild of FF6

Could you not make a branching event that would assign any property (say a selection from $00-05) to actor $00 to make a character that could be any other actor? Then do the same with characters $01, $02, and $03?

This is very feasible. You only need to have a selection screen with a menu or like you say characters from different classes that you talk to. Both can be done via events.

However, implementing that system in the main or subs menu(s) would be a lot more work in my opinion and requires a good knowledge of bank C3.