Who would I be?

Timmy Turner, that's who. Timmy seems to have been blessed with one of the most practical tools ever conceived, fairy godparents, yet he isn't smart enough to use them properly. The key to being a successful human godson, I figure, is to make sure that the wish is foolproof by adding a safeguard at the end. "I wish for a billion dollars" is much more prone to disaster than "I wish for a billion dollars, and for nobody to suspect that I got the money illegitimately." If something does manage to backfire, reverse time. Magic has no boundaries. If I was to take the place of Timmy Turner, I'd certainly take care not to be as reckless and shortsighted as he has proven to be. Fairy godparents grant the owner (let's face it, they are slaves) the greatest potential to achieve self-actualization. Life can be as close to perfect as possible.