I had a decent one in a GURPS Supers campaign. His Super-power was going to be super luck (Well, a bunch of luck-based advantages and such), but I decided to give him an Irish theme. Thereafter, I introduced his superpowers as being Super Irish.

He was also one of the more reluctant superheroes. The rest of his group had to remind him to be good. Once, when investigating a break-in at a convenience store, he tried to steal cigarettes, and then the money from the cash register, claiming that he was only opening the cash register to leave money for the cigarettes.