The power to bring fiction to reality, for Instance if I want the Grilled Cheese Deluxe from regular show I can just make it happen, as for a drawback probably that I need to have finished the show or book that I am bringing to reality from, for example I would have to watch all available...
Honestly I would personally pick Kamen rider universe. I don't necessarily have a rider power in mind but just the thought of riding my bike and fighting enemies while transformed would be dope. Yes, a lot of fighting "If you don't fight, you won't survive!"