I haven't seen any Over-Powered characters in a legitimate setting, I say legitimate setting because there is one RP I was in that's entire premise was a bad parody of bad Roleplaying. It was called the League of Overpowered Gentlemen that took place in the Elder Scrolls series. And yes, we had Gods, God Killers, the Emperor of Skyrim with Tod Howard as a Villain. Oh and Frank Sinatra joined the cast as a NPC and Cobra Commander piloted a Mech suit trying to kill us.

It was stupid fun. The writing was horrid and we Metagamed everyone and controlled each other's characters.