Adding Extra Character Suits To Brawl/P:M

[SolarFusion]

Well, I'm trying to add some new character textures to Brawl/P:M but I don't really want to get rid of the old ones already existing. Is there any way I can do this? Also, if there is a texture for a character such as Peach that turns her into Hatsune Miku, is there a way I can just make a whole new character slot for the Hatsune Miku texture and just copy Reach's moveset?

I'm an extreme newbie to this so if I'm asking a stupid question, please tell me.

Thank you,
SolarFusion