Sponge Bob? Not bad, not bad at all. I think I'll go a more traditional route, though (despite the strong urge to pick Tyreke Evans):
Dr. Manhattan (Watchmen)
There are several things I like in my superheroes, being omnipotent is definetely among them. For those who know neither film nor comic, Dr. Manhattan once was a physicist, who was disintegrated in one of his machines. However, after a few months his disembodied consciousness managed to assemble a new body and with it came basically godlike powers. He can manipulate matter, doesn't age, is impervious to...well anything basically, can travel in time and doesn't need anything to sustain himself. I've even heard people say that he introduced life on Mars, although I don't think that that is a conclusion you can draw from the story.
Anyway, to sum up, what he can do: Anything he wants to. What he can't do: Die. Not necessarily great for him, but helpful for my purposes. Also not great for him: I *will* make him wear trousers.