i would have an idea for later in development it would be to have some costume that you can buy or find for some of the tf form i don't know if you would want to do that because i know that it not in your priority to draw new sprite for the form that are already in the game. It would just be something that would be fun to have like how salamander have the ritual clothe but you could choose how Nana would look between the different costume for each form.
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It certainly is a nice idea and I are a fan of costumes in games as long as they fit^^
But as you said thats a lot of extra work so it defitiely would be something to add at the very end. Maybe I do it if enough people are interessted in the game by the time it's much closer to completion and the game has some support allowing me to focus on such extra stuff.