hmmmmm, i would be able to will myself into any book, and pop out again whenever i want it so i dont die. and the characters would only remember me if i want them to, and the story would still be the same way it was written when i leave, even though i could run around and kill the characters.
But what if in your long life you meet someone who is your absolute perfect match and that person loves you back and the they die and you can't stand to live without that person
Like a champion fighter or something. I consider that a superpower. If it's now, then I'd like to be invisible.