One of my favorite wishes is to make anything that I think up, characters in fiction, items, abilities, becomes real or come to life. If it were unique powers, then I would have the right skill set to tackle any situation.
If it were characters, then they would have their own personality and thoughts, as well as never ponder how they came to be; they just exist now. They also wouldn't be omnipotent; i.e. they can die, age, and once gone, they can never return.
I could just re-imagine them, but the people and things that I would think up into this world would be too cleaver, powerful, or stubborn to be rubbed off easily.