“Robotnik is his real name and Eggman is a common name taken after his shape.” In other words, Eggman is an obnoxious nickname given to him by his haters, but Robotnik is what you'd find on his passport.
One of the questions was why Robotnik was called Eggman, and the response was amusing, if a bit unsurprising. According to Iizuka, the name has always been Eggman, but when the game was localized to the West, somebody on the team changed his name to Dr. Robotnik without consulting the development team.
When shadow debuted in Sonic adventure 2 for the dreamcast (later ported to the gamecube as sonic adventure 2 battle)he was an evil character,yet every game has made him good at the end. Shadow has more of a friendly rivalry with sonic but in this game shadow is willing to kill to find out his past.
Eggman, is the main antagonist of the Sonic the Hedgehog franchise. He is the arch-nemesis of Sonic the Hedgehog the series' titular character.
Starved is an antagonist co-created by averyavary and Dumbie, and solely owned by the latter. He is an alternate version of Dr. Robotnik who was driven to madness and a deep obsession to consume the flesh of mobians.
Although Eggman is a villain, he helps Sonic when the world is at stake; though the reason is always because he knows there would be nothing left for him to conquer if the planet was destroyed. In some of his incarnations, he actually displays a begrudging respect of his arch-enemy, Sonic.
The evil Black Doom, leader of the Black Arms, was Shadow's arch-nemesis and at the same time biological father, as his DNA was used to create the hedgehog.
Metal Sonic is an evil robotic version of Sonic the Hedgehog from the Sonic the Hedgehog franchise, created by Dr. Eggman.
Sonic Team member Takashi Iizuka confirmed on his Facebook that Silver is not a descendant of Shadow.
In the Archie comics, Sonic's real name is revealed to be Olgilvie Maurice Hedgehog. He tries desperately to protect that information, possibly out of embarrassment. This name is not canon (official) in the game continuity, however, and he is simply known as Sonic the Hedgehog in the games.
Sage is a major character in the Sonic the Hedgehog series, first appearing as the central antagonist-turned-deuteragonist of the video game Sonic Frontiers. She is an artificial intelligence created by Dr. Eggman, who considers her one of his greatest creations.
Mecha Robotnik, or "M," was the robotic daughter of Dr. Eggman and sister of A.D.A.M.. She was created during Sonic the Hedgehog's lengthy absence in space, and served as Eggman's chief bodyguard.
Within the Sonic franchise's fictional universe, Shadow is an artificial, anthropomorphic black hedgehog created by Professor Gerald Robotnik, the grandfather of series antagonist Doctor Eggman.
Knuckles serves as an antagonist for the entirety of his first appearance, entirely thanks to the meddling of the true villain, Robotnik. By the time of Sonic & Knuckles, Knuckles became a hero.
Scourge the Hedgehog (formerly known as Anti Sonic or Evil Sonic) was an evil version of Sonic the Hedgehog from Moebius. Unlike Sonic, Scourge mistreated others, was selfish and greedy, and had a great desire for power.
Infinite is the central antagonist of the 2017 platform game Sonic Forces and the main antagonist of its DLC prequel, Episode Shadow. He is the Avatar's arch-nemesis and one of Sonic the Hedgehog's most dangerous enemies. He is a jackal who used to be called the "Ultimate Mercenary".
Metal Sonic is the secondary antagonist of the Sonic the Hedgehog franchise. He is an evil robotic version of Sonic the Hedgehog created by the mad scientist Dr. Ivo "Eggman" Robotnik, Most of the time, Metal Sonic is Dr. Eggman's right-hand and completely obedient enforcer.
He's the husband of Maria the Hedgehog and the father of Felicia, Bella, Shadow Jr. and Jason the Hedgehog in Sonic 2: Victoria Return.
He is very powerful, and managed to defeat Sonic without too much effort. He has one major weakness though: he must recharge his powers with chaos energy.
He married Sally Acorn, who managed to bring some ease to his brutal leadership.
At the temple where the Emerald is located, Robotnik betrays Knuckles and leaves him to die, but he is rescued by Sonic.
“It's definitely admiration,” said Majdoub, laughing, recalling the art. “I think more than anything, Stone just wants attention from Robotnik, and wants to mean something to him. There are elements of their relationship he'll go through that typically someone won't go through just to get that.
Kintobor was transformed into Robotnik by a laboratory accident involving the Chaos Emeralds and a rotten egg, becoming his own evil opposite, who frequently used egg-related puns in his dialogue.