Ive seen some pretty good choices here, but I dissagree with most of them. Most of all, I dissagree with the Superman choice.
What fun would there be when you were powerful enough to have no challenges?
OH MY GOD! A GIGANTIC INVINCIBLE OCTOPUS CREATURE IS COMING TO EAT THE EARTH!!!!
Wait, good citizen, Ill stop it with my newfound kryptonian anti-gigantic-invincible-octopus-creature-from-space-power!
Wow, that might be fun the first, maybe, 10 times, 15 at the most, depending on how easily amused you are.
Batman? Waaaayyyy too messed up in the head. If youve been reading Batman of recent days, hes become a total nutjob. Im talkin the craziest crazy Gotham has ever seen. He still doesnt kill, but he will beat the everlovin hell out of a mere mugger. Plus, he has cast away the Bruce Wayne persona to be completely batman 24/7
Of the choices Ive seen, the hero that would be the most fun to be would be Spiderman. A simple guy who gets the proportionate strength of a spider, can stick to walls, and is smart enough to create a liquid material that "coagulates" into a rope strong enough to swing on, while sticky enough to make anything a viable swing platform. Hes got human problems, and in spite of that, he uses his extraordinary powers to help make the world a better place. A truer hero has yet to be found in the pages of comic books. (well, maybe Captain America)
But who would I choose?
Well.....I would choose Mr. Happy Jetpack, and let me tell you why.
Hes got a bullet helmet with a smiley face painted on it.
Hes got a Jetpack with which he flys all around
and best of all
HES A DRUNK! WHOOOOO ALCOHOL ALL DAY LONG AND ITS ACTUALLY PART OF MY CHARACTER!
Look him up in Google