Doctor Eggman Nega

Eggman Nega (エッグマンネガ Egguman Nega), also known as Doctor Eggman Nega is the third most recurring villain in the Sonic game series and has been the main villain and final boss of all three games he's been in: Sonic Rush, Sonic Rivals, and Sonic Rush Adventure. He is the primary nemesis of Blaze the Cat and Silver the Hedgehog. His design appears reminiscent to the older Dr. Robotnik from the Genesis Sonic games, albeit with the colors reversed, a longer nose, a white mustache (suggesting he is at an eldery age), pointy blue sunglasses, and visor-styled goggles instead of normal ones.

In the Sonic Rush series, Eggman Nega (spelled NEGA, with all caps) is introduced as an extra-dimensional counterpart of Doctor Eggman from Blaze's home dimension. He is more cruel and calculating than the Eggman from Sonic's world, although the two often work together, and he has sent Blaze's world into ruin, which is why he sets out for the Sol Emeralds. He is eerily polite for such a cold and calculating person. His downside, however, is that he can sometimes lose track of important details while making unnecessary speeches.

While Eggman himself is first thought to be the primary antagonist in Sonic Rivals, the player soon finds out that Eggman Nega has captured Eggman and is disguising himself as him. In Sonic Rivals, Eggman Nega is from 200 years in the future (which reflects the Blaze of Sonic the Hedgehog). Using a special camera, he turns several objects and characters into cards, with the objective of turning the world into a card that he will be able to control. During the somewhat ambiguous ending of the game, Nega is captured inside a card of his own by Silver, yet it was never revealed how he freed himself from the card that he was imprisoned in for the sequel. In Sonic Rivals 2, Eggman Nega tries to power and awaken an inter-dimensional monster called the "Ifrit" to destroy the world by using the Chaos Emeralds and the Chao to do it after reading old files of Professor Gerald Robotnik. However his plans were foiled once again and now he's stuck in the ifrit's Dimention.

Personality
Eggman Nega is eerily polite, despite being even twice as cruel and calculating than Dr. Eggman himself. He appears to be insane, trying to destroy the whole world along with himself on numerous occasions. He has also been described as very sneaky, even disguising himself as Eggman on some occasions. His downside, however, is that he can sometimes lose track of important details while making unnecessary speeches.

Sonic the Hedgehog
In Sonic Rush, Sonic chases and then defeats him at the end of the game. In Sonic Rivals, Sonic is unaware of the presence of Eggman Nega, as the revelation is not seen in his storyline.

It is quite possible that Eggman Nega sees Sonic as a bigger threat than Blaze and may even loathe him, since he is the one who taught Blaze how to properly use the Sol Emeralds and has kept her inspired and calm during critical moments. Also, while he is able to frustrate Blaze as he chooses, he has difficulty doing the same to Sonic. In fact, Sonic frustrates him.

Doctor Eggman
Eggman Nega's relationship with Dr. Eggman depends on which sub-series you look at. The two worked together in Sonic Rush and Sonic Rush Adventure. This is possible because they both have the same goal of ruling the world. Yet, they work together again at the end of those game to try and defeat Burning Blaze and Super Sonic, only to be defeated by them in the end. In the version of Eggman Nega seen in Sonic Rivals, Eggman is turned into a card by his hand. He is also Eggman's descendant in this version, rejected in the future due to his ancestor's constant failures. Eggman later helps Shadow and Silver to stop Nega by flying them onto Nega's moon base. In Sonic Rivals 2 Eggman Nega tries to power and awaken an inter-dimensional monster called "Ifrit" to destroy the world by using the Chaos Emeralds and the Chao to do it after reading old files of Professor Gerald Robotnik.

Blaze the Cat
One of Eggman Nega's main foes is Blaze the Cat, who guards the Sol Emeralds. They are both from the same world and it is suggested that Eggman Nega is the equivalent of Sonic's Dr. Eggman. Much to his amusement, Blaze loses her composure easily with him, as shown at the end of Sonic Rush Adventure when Nega threatens to destroy her kingdom. As Blaze has only appeared as a card in the Rivals series.

Silver the Hedgehog
Another one of Eggman Nega's foes is Silver the Hedgehog. In Sonic Rivals, it is revealed that the two are enemies, and Silver is one of the few characters in the game that knows that Nega is actually disguising himself as Eggman. Silver battled Eggman Nega, however Nega's device malfunctioned, and he himself was turned into a card. They clash again in Sonic Rivals 2. According to Silver he has been chasing Eggman Nega for a long time.

Metal Sonic
Eggman Nega also had a temporarily ally in Metal Sonic. It is unexplained why Metal Sonic worked with Eggman Nega, but is possible that after Nega turns Eggman into a card, he reprogrammed Metal Sonic to work for him instead of the present-day Eggman. However, the alliance ended after Sonic Rivals. In Sonic Rivals 2, not only are Metal Sonic and Eggman Nega enemies, but Nega provides Metal Sonic with his own personal rival. Apparently upgrading Metal Sonic's design, Eggman Nega created Metal Sonic version 3.0. This Metal Sonic copy looks exactly like the original Metal Sonic, but has a black and yellow color scheme, similar to G-Mel of Sonic Advance 3.

Shadow the Hedgehog
Sonic Rivals 2 also features an enmity between Eggman Nega and Shadow the Hedgehog. Shadow learned of Nega's identity and plans in the first Rivals, and is quickly caught on to his disguise as Eggman in the sequel. Shadow and Metal Sonic both work together to stop Eggman Nega from releasing the Ifrit and destroying the world.

Rouge the Bat
In the first Rivals game, Rouge sends a distress signal for Shadow and has been turned into a card for some reason. In Sonic Rivals 2, Nega has some kind of connection with Rouge the Bat, who he hired to find the Chaos Emeralds for him. However, Rouge was unaware of her client's identity and came to believe it was Dr. Eggman who had hired her. Her part in Sonic Rivals 2 means that she was unwitingly working for and against Eggman Nega.

Knuckles the Echidna
Knuckles and Eggman Nega both appeared in Sonic Rush, but Knuckles never knew about his true identity, similar to Sonic. When Knuckles allies with Rouge in Sonic Rivals 2, he could be considered to be working both for and against Nega.

Espio the Chameleon
When Espio was assigned to uncover the recent Chao-nappings, he came across Silver, and later met Eggman Nega. He and Silver joined forces to battle him. Nega did whatever he could to kill the duo, but all of their attempts failed. As he sent out Metal Sonic 3.0, Silver and Espio made progress defeating it after a long harsh battle in the Ifrit's lair. The team also recovered the lost Chao from him and as Nega was suddenly stuck under rubble inside the cave while the door was closing them in asking for help, Espio answered back saying, "You reap what you sow, Eggman Nega." Silver and Espio then escaped with no problem as the door closed.

Quotes
"Oh, I'm sorry. I shouldn't have laughed. It's just that... you're so cruel. You taunt me by not using my full title."

"But in the end, you will be destroyed by... Dr. Eggman Nega!"

"Get ready to be schooled!"

"You'll regret this!"

"It's always best to have someone else do the dirty work."

"I couldn't care less what happens to our world."

"GAH! Sonic the Hedgehog!"

"It'll be Eggmanland beyond this dimension!"

"My incredibly profound plans... It was such as small miscalculation that I made. It shouldn't matter. It's not over yet, just give me some time and I'll-"

"Fine then! I'll use this camera to turn the whole PLANET into a card!"

"You can just sit back and watch! Farewell!"

"Well, if it isn't my block-headed doppleganger! What's the matter? Did you get stuck inside your machine?"

"My contraption will chew you out, and then have seconds! Hee hee hee hee!"

"I'll take back the piece of paper, if you don't mind. And without further ado, I'd like to introduce you to MY friend!"

In Archie Comics
For more information, please see: Eggman Nega (Archie).

Trivia

 * Fans often debate if the Eggman Nega from the Sonic Rush series is the same as the one from Sonic Rivals or is a completely different person. They have entirely different origins, but nothing official has ever been stated regarding this discrepancy.
 * How Nega managed to return after getting himself turned into a card in Sonic Rivals is unexplained in both its sequel and Sonic Rush Adventure however it could be likely that after Eggman Nega was turned into a Card Silver or somebody might've used a device to get Eggman Nega out of the Card but then put him in Captivity afterwards, though this still remains unanswered.
 * Due to his actions toward Sonic and Blaze (and Silver), Eggman Nega can be a very dangerous madman in the Sonic series.
 * Despite the fact that he's a member of the Robotnik family, that surname was never applied to him in either the games or their respective manuals.
 * The picture at the top of the article has Nega in a similar pose to Eggman's artwork in Sonic X and Sonic And The Secret Rings. The appearance of King Sharyar, Dr. Eggman's Arabian Nights character, may have been influenced by him.
 * After the events of the Sonic Rush and Sonic Rivals Games, Since Eggman Nega is still alive there is a sight chance that Eggman Nega might return one day, plus he has yet to appear in a Home Console Sonic game.
 * In Mario & Sonic At The Olympic Winter Games, Eggman Nega appears as a boss character.
 * Curiously, the characters that don't find out about Eggman Nega's future origin in the Sonic Rivals series consist of only the characters that have knowledge from the Sonic Rush series about his dimension origin. Eggman was captured by Eggman Nega, but that certainly doesn't confirm that he ever found out about Eggman Nega being his descendant. Also, when Rouge was contacting Shadow in the first Sonic Rivals, it is suggested that she is trying to tell him that she found out Eggman Nega's true identity.
 * The major difference between Eggman and Eggman Nega is Eggman laughs like ho ho ho and Eggman Nega laughs like hee hee hee.That is the only way tell the difference between them when Nega is impersonating Eggman
 * Mario & Sonic At The Olympic Winter Games marks Eggman Nega's first official appearance on a home console video game.