i dunno! there r so many to choose from! i have always wanted to fly with wings like dark and krad from d.n. angel but i think its a waste to ask for wings.
i would ask for the power of geass.
i mean common its mind control.
i would probably use it for good ,but then i would probably end up being corrupted and wanting total control of the world. i take over the world faster than u can say lelouch Lamperouge