Well the only thing SheezyArt ever did well was their handling of groups, so I'd suggest glancing at it.
However I don't think the groups people are members of need their own slot on the person's page. Takes up unneccesary space.
So a friend of mine is going as a character from his novel called Wraith. He's human, but one of his hands is abnormal, with extraordinarily long fingers - something like this:
The main part we're having issues with, obviously, is how to get the fingers to be able to move. They're going to...