Doctor Eggman
Doctor Ivo Robotnik, better known as Doctor Eggman or simply Eggman, is a character created by the Japanese game designer Naoto Ohshima and the main antagonist of Sega's Sonic the Hedgehog franchise. Eggman is a mad scientist who seeks to steal the mystical Chaos Emeralds, destroy his archenemy Sonic the Hedgehog, and conquer the world.