E-123 Omega

E-123 Omega is a robot from the same world as Sonic the Hedgehog. Created by Dr. Eggman, he rebelled against his creator and joined Team Dark alongside Shadow the Hedgehog and Rouge the Bat.

History
In Sonic the Hedgehog Issue 250, Omega joins forces with Sonic and Mega Man's team of heroes, namely: Espio the Chameleon, Vector the Crocodile, Charmy Bee, Proto Man, Amy Rose, Miles "Tails" Prower, Knuckles the Echidna, Rush, Shadow the Hedgehog, Silver the Hedgehog, and Blaze the Cat. Having located the Wily Egg, Dr. Eggman and Dr. Wily's base of operations, the group faced off with a massive army of Robot Masters who had been time-cloned by the doctors to defend the flying fortress. Omega quickly proved his superiority to Napalm Man, before setting out to rescue his teammate Rouge the Bat, who had been transformed into Rouge Woman of the Roboticized Masters.