Dr. Ivo "Eggman" Robotnik

Doctor Ivo "Eggman" Robotnik is a fictional character and the main antagonist of Sega's Sonic the Hedgehog series. After the creation of Sonic the Hedgehog, his character designer chose to use his previous egg-shaped character to create the antagonist of the 1991 video game Sonic the Hedgehog, making him the archenemy of the series' eponymous main character.

In the main line of video games, Dr. Eggman is a rotund mad scientist who plans to conquer the world to build his own Empire. While he has gone through several major and minor appearance changes throughout the series, his in-game designs retain several basic characteristics, such as his egg-shaped body, red-black-yellow clothing, bald head, pince-nez sunglasses, and large mustache. Eggman commonly creates machines and robots, including a wide variety of Badniks. Notably in early games, he has also served as a recurring boss, appearing in almost every level piloting one of his created vehicles.

Eggman has appeared in almost every Sonic the Hedgehog video game since his first appearance in the 1991 title Sonic the Hedgehog and is also a prominent character in other media, including comics, novels, animated TV series and film. He has also been very well received by critics and fans alike, while remaining as one of the most popular and recognizable villains in gaming.