GoblinTron. He isn't a superhero, but is a villain, Batypus's nemesis. He is a Goblin, who had an accident, and now his entire left side is robotic. He has an evil claw and a goblin hand. He has a small crime empire based in the town.
Another gang of supervillains, the Bungees. They bungee-jump around, into banks and things and steal stuff.
That's the main gang. Perhaps I'll add more. I don't think Powerful Man comes into this.