Dr. Ivo Robotnik (often known by the nickname Dr. Eggman) is the primary antagonist of the Sonic the Hedgehog series, often appearing as a recurring boss and/or final boss character in many games in the series.
He is an obese scientist with an IQ of 300 and a dream of dominating the world. Eggman's constant plots to create his Empire are endlessly thwarted by Sonic the Hedgehog, his arch-enemy, and Sonic's friends. His most powerful creation is none other than Metal Sonic.
In M.U.G.E.N, most of Dr. Eggman's appearances are usually in his classic TV-style version, as seen in various YouTube Poop videos.
Txpot's version is based on his video game adaptations. While most of his attacks are unethical, mostly consist of him using hammers, the beans from Dr. Robotnik's Mean Bean Machine, and see-saws to attack, while his special moves consist of himself turning into his creations, such as the Drill Tank. He has brutal A.I. and can summon Metal Sonic, Metal Sonic V2, and Metal Knuckles. He sometimes will start before the round begins by shooting a Proton Cannon. There's also old and new versions, but only the new version is available.
A remake of FredderyII's version, Aperson98's Dr. Robotnik character still utilises many of his YouTube Poop-based attacks, but in a different way. He uses KOF-styled sprites that are edited from Cheng Sizan.
This version of Eggman uses sprites taken from his appearance as the boss of Emerald Hill Zone in Sonic the Hedgehog 2. It behaves exactly as it does in Sonic 2, running back and forth across the stage, trying to ram the player with its drill, and firing it as a projectile once its health is low enough.