Well, your powers don't really start to manifest until about a page or two into the roleplay, and even then, they won't manifest greatly.
As for the kind of abilities, they will primarily focus upon yourself (such as increasing strength, stamina, etc) at first. Once we get deeper into the story, you abilities will be allowed to branch out further. Above all, aim for originality and avoid the cliche, elemental-based powers. Once the thread is up in full, you should have a clearer picture of where the story is heading and what type of abilities to expect.