Where You've Seen Him: Gigantor, also known as Tetsujin 28-go
His Story: Originally designed as a weapon, Gigantor was reprogrammed for peace. He's controlled by Jimmy Sparks, and can all kinds of neato things like fly and punch things really, really good.
Why He's Memorable: Gigantor is the first mecha character, providing a model for every other mecha show out there. Everything from Mobile Suit Gundam to Robotech to Neon Genesis Evangelion.
Tomorrow -- the "Princely" type.