Megaderp is the elder brother of Rokmon, who were created by the same scientist in Finnittania. He is similar to his brother as they wore similar clothing, but he is taller than him. 2 days after his creation, he suffers moments of insanity where he acts like a 5 year old, because of that, he relies on treatment on Robotic Insanity. He later became enemies with Tetsuweegee Atom's siblings, because that's what brothers do for each other! However, he is a fan of every Megaman games, as well as a metal band called Megadeth, because it has Mega on his name.