Someone pointed out to me that I wasn't very clear about my RPG idea.  It made sense in my head, but I didn't get it all out on paper, so to speak.

The campaign idea is that each player will be playing an ordinary guy (it could be based on themselves, or it could be someone they create).  They are chosen and contacted by a "higher being" of some sort, who has decided they would be suitable as a hero.  They are given the ability to transform into a hero from popular culture (in this case, the "theme" would be comic book heroes like Superman and Batman).  However, the form chosen is always one of the attractive female characters.  Thus the guy gains that heroine's appearance, powers, weaknesses and outfit when they take on their heroic form, but they are not becoming that heroine.  Their mind remains their own.  So they are still ordinary guys, only now they can become extraordinary girls.