Well, that all depends on the RP. Some require different things, and some have different restrictions. Like, if it's a Kingdom Hearts RP, you wouldn't galavant around with Ninja powers. The opening post of the thread, nine times out of ten, will have a template that'll show the bare bones of what you need in a character, and the rules should illustrate what restrictions you have. If you want, point me in the direction of the RP, and I'll read over it, and give ya a summary of what ya need.