Welcome to the X-Men world (Marvel) with Charles Xavier and the rest like Wolverine, Cyclops, Storm, Phoenix, Nightcrawler, Beast, Colossus and Deadpool can be there too(why not?), etc. There are also the villains like Magneto, Sabretooth, Juggernaut, Mystique, Pyro, Blob, etc. You are a mutant (choose your age, looks, personality, and mutant abilities.) Or you can be a character. Are you in the city? a student at Xavier's? Or are you a hero in the X-Men? Perhaps a villain? Make your story however you want.