Fire, the ultimate weapon. If I could have any superpower at all, it would be shooting balls of flame from my hands. That is all I have ever wanted to be able to do. I can't remember where I first heard of such a superpower, but almost all of my characters on City of Heroes were pyrokenetic. And Liz Sherman from Hellboy kicks major butt.
So what is your superpower? Fire? Ice? Flying? X-ray vision?