Dr. Ivo Robotnik , also known by the alias Dr. Eggman ,is a video game character and main antagonist of the Sonic the Hedgehog series. He is a rotund scientist with an IQ of 300, and the de facto archenemy of Sonic the Hedgehog. His character designer is Naoto Ōshima, and he has gone through several appearance changes throughout the series
Doctor Eggman is described as being a certifiable genius with an IQ of 300. His fondness for machines has also made him a renowned authority on robotics. Ultimately, Eggman’s goal is to conquer the world and create his ultimate utopia, Eggmanland (alternatively known as the Eggman Empire or Robotnikland). He selfishly never gives up on this matter, and does not care for others’ opinions. He considers those who would interrupt his plans a prime threat. His abominable laughter and maniacal declarations contrast his self-professed softer side, as a romanticist, feminist, and gentleman. Despite his intelligence, Eggman can be terribly immature, prone to childish emotional fits when he is not getting his way. Although Sonic has always ruined his evil plans, Eggman begrudgingly holds a secret respect for his determination.