Dr. Eggman is a short-tempered, ego maniacal, outspoken, raucous and pompous evil mastermind with some noticeable sardonic wit. He has all the qualities of a classic villain: he looks, talks, and dresses like a bad guy and has selfish and unmotivated dreams of conquering the world, the destruction of his enemies or both. A would-be tyrant, Eggman has a hunger for power, a thirst for destruction, and as well a desire for attention, adulation and a little respect. Loving to brag, he holds a high view on himself which makes him highly arrogant and gives him a sense of self-entitlement. This attitude has lead him to deny his numerous failures (referring to them as practice runs), deem his terrible actions justified, and privatize otherwise public rights. Driven by a constant desire to ultimately enslave the entire world, he is determined to do whatever it takes to achieve his goals, even if that means causing meaningless destruction, getting into otherwise awkward situations or joining an enemy more powerful than he is. His uncaring personality is mostly due to his over-inflated ego, as he only views himself with utmost pride.

Complementing his arrogance, Eggman is rather vain. He is very concerned with how he and his robots look like and takes great pride in his mustache, which he grooms professionally and would give up his chance at power to preserve. Despite having unlimited resources at his disposal, Eggman can be rather stingy as he refuses wasting more money than needed and always complains when he thinks his money are going down the drain. While sometimes showing the tendencies of a neat-freak, Eggman actually has poor personal hygiene.

Eggman is a complicated guy when it comes to his relationships. While contradictory to his previous villainous exploits against them, Eggman has no trouble cutting loose and having fun with his enemies at appropriate times, whom he can even show a sincere fondness of. In the case of Amy, he remains her enemy on the battlefield, but in their free time they are "Fuzzy Puppy buddies." Though this comradely behavior is sometimes a front he uses to exploit his enemies, Eggman is willing to provide genuine help to his enemies as he believes the "bro code triumphs the enemy thing." Also despite being extremely reliant on his robots, Eggman has a bad habit of mistreating them with his callous attitude and abusive care.

For all his smarts, Eggman is deranged, immature and buffoonish in behavior, and his schemes are usually more zany and petty rather than threatening.[48] Also, despite being a self-proclaimed "man of science," he can just as easily believe in the supernatural, and shows signs of phasmophobia.  Possessing an overly obsessive focus on achieving whatever goal comes to mind, Eggman tends to overlook crucial details in his plans, having more than once risked the entire existence of the world in order to nudge a victory over his enemies or concocted evil schemes that would ultimately mean nothing in the long run.

It has been stated that Eggman used to be full of hope in his youth. However, his years of failures have left him with a more pessimistic attitude. Also, even though he refuses to give up on his ambitions, no matter how many losses he has to endure, Eggman has been known to sink into depressions after a particular painful streak of losses. Even if he should be at his lowest however, Eggman is quick to pick himself up once he is struck by inspiration.

Despite his self-proclaimed status as evil and powerful, Eggman's acts of villainy can be rooted from a childlike desire to be acknowledged; if Eggman snagged an legit invite to Sonic's next sleepover, he would consider it a victory. In fact, Eggman is a very lonely man who suffers from an emotional void that he tries to fill out by involving himself in others' lives. This is best exemplified in the complex relationship he has with Sonic. He has also had several less-than-malevolent hobbies and passions that he has enjoyed outside of his villainy, hinting he is not all bad. Most noticeably, he was willing to save the life of Beth the Shrew after the girl had showed him nothing by kindness. It has also been pointed out that Eggman is quite fickle; in the case of D-Fekt, Eggman shifted almost instantly from boasting proudly about D-Fekt's abilities to berating him for being made a failure when his abilities did not work as intended. Similarly, Eggman tends to make mountains out of molehills over the most measly or mundane things when he feels he has been wronged, which he justifies on the grounds that it is the "principle that counts." He also never forgets any grudge he might have.

While Eggman's pride and arrogance are his core parts, they are also his greatest weakness, as they make him far too overconfident and prone to announce his plans prematurely which ultimately leads to his downfall. Excessively self-delusional, he thinks others secretly admire him and only mock him out of jealousy. Also, when feeling upstaged by greater evils, Eggman will devote himself to overthrow his contenders and establish himself as the top villain around. When in situations over his head though, he is willing to abandon his pride to get help, even if it means demeaning himself. He is also laidback and is noted to be somewhat of a doofus as he misses out on great opportunities to eliminate Team Sonic. He also prefers tactics that involves as much destruction as possible (despite how much better a subtle approach would be) and he can pretty much only handle situations in a villainous manner. Because of all his flaws, no one really considers him a true bad guy; however, this also works in Eggman's favor as people tends to underestimate him, which makes him an unpredictable opponent. Eccentrics aside, Eggman is still a highly intelligent, deceptive and manipulative individual under the right circumstances who can play his foes right into his hands and make some very dangerous devices. Also, while things might not always work out for him initially, he is always working behind the scenes to get the upper hand and come out on top.

While I know Mike Pollock also voiced Eggman in Sonic Boom, I would like to see an original take for this version of him, so show me what you got!