, also known by his alias , is a video game character and main antagonist of the Sonic the Hedgehog series created by Sega. Dr. Robotnik is a rotund, mad scientist with an IQ of 300 who plans to conquer the world, and is the evil archenemy of Sonic the Hedgehog. His character designer is Naoto Ōshima, and while he has gone through several large appearance changes throughout the series, his design retains several basic characteristics, such as his egg-shaped body and his large mustache. Beside his scientific skilled mind, he is also very immature and tends to throw a temper tantrum mostly whenever his plans fail. He has appeared in almost every Sonic the Hedgehog game series and in all other media.
In April 1990, Sega commissioned its AM8 R&D department to create a character who would replace Alex Kidd as the company's mascot, as well as compete against Nintendo's flagship character, Mario. A caricature of Theodore Roosevelt was among the proposed designs, and combined with the idea of an egg-shaped character, it eventually became the basis of the visual design for Dr. Robotnik/"Eggman". In creating the "bad guy" for the Sonic series, the development team wanted a character who was "the opposite of Sonic;" a character who represented "machinery" and "development" to play on the then-growing debate between developers and environmentalists. The character was also designed to be easy for children to draw.
The original English instruction manual for his 1991 debut game Sonic the Hedgehog described the character's full name as "Doctor Ivo Robotnik" Then in 1999's Sonic Adventure, the character was called both "Doctor Robotnik" and "Doctor Eggman" in the English version, Despite this, the Japanese Sonic Channel profile listed his full name as unknown.
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. He selfishly never gives up on this matter, and does not care for others' opinions. Although Sonic has always ruined his evil plans, Eggman begrudgingly holds a secret respect for his determination.
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