Navi hands down. I mean, who wouldn't want to be a retarded-annoying-ball-of-light-fairy-thing that no one likes? Plus, you get to experience Link's adventures and go on adventures yourself, but you wouldn't be in danger. I'd also be fine with Serena from Pokemon, I mean, who doesn't want their own Pokemon to own, and not just the game. It would be so fabulous that I would just explode and then pull myself together and then implode and create a black hole and destroy the very fabric of space and time!