Robotboy is a robot built by Professor Moshimo. He was designed to resemble a real boy. Robotboy has three activation modes: deactivation, where he resembles a doll; normal, where he is roughly Tommy Turnbull's height; and super activated, where he towers over most adults, and has a plethora of machine guns and rockets.

Moshimo intended to enter him into a robot fighting TV show, but before he could do that, his old-rival Dr. Kamikazi learned of Robotboy and intended to steal him to take over the world. Knowing the evil he could do with Robotboy, Moshimo sent him to his pen pal and "biggest fan", Tommy Turnbull. During the opening, it's stated that Robotboy was given to Tommy for Robotboy to learn how to be more like a human boy, but it is not stated how long he had been activated or why Tommy was his chosen guardian (we can presume that Moshimo's reasoning is behind Tommy being his number 1 fan)

In MUGEN, Robot Boy is a very crafty little robot, obviously being a robot. He packs a punch!

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