1. Normal ordinary man, originally the best super hero with no super powers, but can still fight crime and beat supervillians with just his fist and gadgets (i.e. shark repellant, suction boots etc.)
If a normal guy joined the justice league, Batman says, "He can't join, he doesn't have any super powers!!" Then superman would say to him, "Doesn't he Batman? Doesn't He? No Super Powers??"