Well, there's Leroy... I mean the Incredible Exo-skeleton Man. Depending on the source, there may also be Harmonious Fist, Agent One, Agent Orange, Agent x, Charly, Alex Hampton, and some FoxBots.
In my campaign worlds, he's also been joined by the likes of Dot, Garble, The Amazing Static Man, Batfox, Professor Robert Steriaca, Blinky, and The King. (Not all at once, thankfully.)