Dr. Eggman

Dr. Ivo Robotnik, better known by his alias Dr. Eggman, is the primary antagonist in the Sonic The Hedgehog series and the arch nemesis of Sonic The Hedgehog, much in the same manner as Bowser opposes Mario. The Doctor is a genius with an IQ of 300, and his goal is to dominate the world and build the Eggman Empire.

Mario & Sonic at the Olympic Games
Dr. Eggman, as well as several other Sonic the Hedgehog series characters, appears in the Olympic crossover game Mario & Sonic at the Olympic Games. He is a Skill player, despite his rather large size, and he's also unusually fast. However, Dr. Eggman is lacking in power, and his stamina isn't that strong either.

Mario & Sonic at the Olympic Winter Games
Eggman appears as a playable character in the sequel Mario & Sonic at the Olympic Winter Games, and appeared in the first trailer for the game along with Sonic the Hedgehog, Mario, and Wario. He is again a skill type character. In the DS version of the game, he is one of two main antagonists of Adventure Tour along with Bowser. He and Bowser try to stop the 2010 Olympic Winter Games by capturing all the Snow Spirits. They would like to make their own Olympic Games, but Mario, Sonic, and their friends have stopped Eggman and Bowser.

Mario & Sonic at the London 2012 Olympic Games
Dr. Eggman appears once again as a Skill type playable character in Mario & Sonic at the London 2012 Olympic Games. He has a very high Technique level and performs well at events such as Gymnastics.

Mario & Sonic at the Sochi 2014 Olympic Winter Games
Dr. Eggman also appears in Mario & Sonic at the Sochi 2014 Olympic Winter Games. He retains his role from previous titles, being a playable Skill type character.

Profile
''Although the devious Dr. Eggman has great Skill-based abilities, he also is quite powerful. His huge, lumbering frame doesn't give the impression that he would be good at gymnastics, but believe it or not, he can handle the trampoline and vault quite well.''

Super Smash Bros. Brawl
Dr. Eggman makes a cameo appearance as a collectible trophy in Super Smash Bros Brawl, which is obtained by collecting over 500 stickers. He also appears on a sticker which increases a character's launch resistance by 39 points.

Trivia

 * Dr. Ivo Robotnik, along with Miles "Tails" Prower and Amy Rose, are the only major characters in the Sonic series to have formal names.
 * Dr. Eggman has a bulbous pink nose similar to Wario, Waluigi, Dr. Crygor, Jimmy T., Jimmy P., and Booster.
 * Dr. Eggman appears alongside Bowser and Zangief in the Disney film Wreck-It Ralph.
 * Dr. Eggman's Japanese voice actor Chikao Otsuka also voices Wario in the Japanese commercials for Wario Land games.
 * In the Sonic series, namely the Sonic Riders spinoff titles, Eggman is a Power character, but is strangely made a Skill character in Mario & Sonic crossovers. This may be to keep each character type at an equal 5 characters per type.