Born in Rhineback, Guido Carosella's mutant powers were triggered in childhood when an incident with schoolyard bullies and being hit by a bus ended in his body becoming disproportionally large and overmuscled, after losing much of his fortune, he began to take on jobs that would allow him to maintain his luxurious lifestyle. This led to Guido becoming the long-time roadie and bouncer for the mutant musician Lila Cheney. He was later among the mutants living on Muir Island who were mentally controlled by the telepath Shadow King. After the Shadow King was defeated, several of the Muir Island mutants, with the help of Valerie Cooper, are recruited into the new X-Factor team.
Strong Guy is a six button, MvC styled character with sprites edited off the Hulk. His gimmick is that there is a gauge of kinetic energy at the bottom of the screen. The more Strong Guy gets hit, the more kinetic energy he will get, which in turn gives him more super armor.