Robotnik: "Snively, what color is my heart?"
Snively: "I don't see a heart, sir..."Sonic the Hedgehog, though usually a lighthearted franchise, becomes much darker when these characters show up.
- Shadow the Hedgehog: Black Doom is the leader of the Black Arms and a completely humorless Evilutionary Biologist. Having visited the Earth for thousands of years, he made contact with Gerald Robotnik 50 years prior to the series, agreeing to a deal where a creation using Black Doom’s cells, the future Shadow the Hedgehog, would deliver the Chaos Emeralds so that the Black Arms can use Chaos Control to arrive on Earth and bring prosperity to humanity. Gerald realized once Doom left that he was lied to, as Black Doom intended to enslave the human race and use them as a food source. During the events of the game, he preaches about the evils of humanity and how they don’t deserve to be free, claiming they would be better served as a food source for the Black Arms, all while showing he has no regrets killing his own men or throwing away his “son” when everything is finished. During the game, he sends his army to kill millions, manipulated Shadow by forcing him to relive Maria’s death, destroys an entire city—and most of his army—with the Eclipse Cannon, and spreads a gas that paralyzes Sonic and friends to make it easier for his offspring to eat them. Hypocritical, ruthless and uncaring to even his own, Black Doom is among the worst the world of Sonic the Hedgehog has to offer.
- Sonic the Hedgehog (2006): Mephiles the Dark is the malignant conscience of Solaris taken physical form and the one responsible for arranging most of the events of the game. Accidentally created during the Solaris Project alongside Iblis, the raw physical strength of Solaris, Mephiles was sealed within a scepter that landed in the hands of Dr. Eggman. Upon breaking out, Mephiles orchestrated a gambit which involved inflicting pain and suffering on Princess Elise, causing her to cry, release the Flames of Disaster, and in doing so would reunite him with Iblis to become Solaris, allowing him to destroy everything in existence. To do this, Mephiles manipulates Silver into attempting to kill Sonic, and later cold-bloodedly kills Sonic himself—temporarily— to goad Elise into crying over him. Mephiles manipulates everyone he can for the purpose of his ultimate goal and takes a sadistic glee in watching people suffer; unlike the mindless Iblis, Mephiles is fully aware of the scale of his atrocities and does them for no other reason than to see the world decay around him. A being that craved destruction alone, Mephiles's actions heavily damaged the space-time continuum and brought a darkness to the franchise seldom seen prior.
- Sonic and the Secret Rings: Erazor Djinn is a malevolent genie with aspirations of godhood and world domination. Having been forced to grant the wishes of 1,000 people as punishment for his crimes prior to the game, Erazor harbored a hatred for the creator of the Arabian Nights and sought to escape that storybook world. To that end, Erazor began to destroy and absorb the pages of the book to grow in power. When Shahra brings Sonic into the storybook to stop him, Erazor uses his Flame of Judgment curse to force Sonic into finding the Seven World Rings for him before the flame kills Sonic. He also commits other attrocites such as attempting to assassinate King Shahryar, summoning the Ifrit demon to burn the remaining pages of the book, and condemning King Solomon to life as an undead skeleton. When Sonic confronts Erazor at his palace, Erazor reveals his intention was to sacrifice Sonic to gain control of the Seven World Rings and reshape the world in his image. His attempt to kill Sonic is thwarted when Shahra takes the hit for Sonic. Erazor is unmoved by her sacrifice, calling her weak. Self-absorbed, and with the cruelty to match his ego, Erazor's transformation into Alf-Wayla-Wa-Layla only reflected the evil within his heart.
- Sonic the Comic: Dr. Zachary, Knuckles's Arch-Enemy, is introduced as a seemingly harmless old man and one of the last of the echidnas. Zachary tricked Knuckles into leading him into the Emerald Chamber, whereupon he shattered the Master Emerald and used the Chaos Emeralds to empower a reprogrammed machine of his. Zachary gleefully allowed the inhabited floating island to fall onto Mobius as a "monument to his genius", intending to butcher the population of the planet Mobius for his own amusement before seeking revenge on Knuckles's people. In his second appearance, rebuilt as a cyborg, Zachary leads Robotnik to the location of the floating island's villagers so Robotnik could use them as components in a biological computer, which would consequentially kill them, a process which Zachary happily watched over. Possessed of a vindictive streak matched by few, Zachary manages to outshine most of the comic's other antagonists despite his relatively minor running as a villain.
- Archie Comics' Sonic the Hedgehog:
- The original Dr. Ivo Robotnik, during the Great War, intended to test weapons he'd developed for the government on his own people and fled to the Mobians' side when he was to be punished for his actions. While acting as warlord for King Acorn, he secretly captured a peaceful village of Mobian monkeys and utilized them in an early attempt to create mechanical slaves by surgically implanting cybernetics, and of that entire village only one survived the process. Afterwards, he sabotaged the roboticizer developed by Charles Hedgehog just as it was to be used on his wounded brother Jules, making him think he'd turned his own brother into a mindless drone. When Jules's wife discovered the truth, Robotnik had Jules toss her into the Roboticizer and transformed into a robian as well, orphaning Sonic and crushing Charles's spirit to the point of retiring from being a Science Minister to running a chili dog stand. He then did similarly to Tails's father Amadeus on the day of his birth, making it seem as though Amadeus could care less for his newborn son and subsequently shattering his wife's heart, throughout which Robotnik maintained a straight face. Afterwards followed his betrayal of King Acorn and the takeover of Mobius, during which countless families were broken and millions enslaved, and over the course of a decade, he'd wreak havoc upon planet Mobius, destroying the ecology and pushing more than a few mobian breeds to the brink of extinction. And just prior to his death, he displayed a deeply disturbing relish at the thought of murdering one of his own kind and was positively gleeful when he got the chance to use his latest and greatest weapon on a fellow overlander.
- General Kage Von Stryker is the leader of the Eggman-backed Dingo Regime. After ousting his father Helmut from power, Kage led his people in conquering Angel Island, imprisoning the Echidnas in what were clearly concentration camps, which led to countless deaths. He personally tortured Knuckles's father for the location of the Master Emerald, tried to wipe out the last echidna village on two occasions, and during the second attack boasted that he had crushed more Echidnas under his boot than he could remember. While like Helmut, Kage also hated the echidnas, unlike his father, Kage just wanted to Kill 'em All.
- Dr. Finitevus was once a fellow scientist of a race of prosperous echidnas, until a freak accident changed his looks and intelligence. Despite his newfound genius, he was declared mentally unstable and was to be put down. He escaped and later sold out his home to Dr. Robotnik, resulting in everyone who had once lived there dying later. In addition, Finitevus manipulated four whole sides in a war—Dingoes, Echidnas, and two Dark Legion factions—into providing the fuel for the fire of his master plan, which is him deciding the world is hopelessly corrupt and wanting to purify it...in fire. He, to this end, manipulated Dimitri, a head in a jar, into providing secrets and information, and then manipulated Knux into becoming Knuxerjak and starting a battle with his former friends after the whole corruption from power thing. Finitevus's expression at the scene where Knux becomes Enerjak shows he is not only mad, but completely delighted, even as his betrayed allies watch on and denounce him.
- Hunter, as his name would indicate, would hunt down certain specimens of Mobian, and he debuted trying to do just this to Knuckles. Hunter revealed that not only did he hunt down Mobians, but that he would also claim their heads as trophies in the same manner of a real life hunter. After being defeated he would go on to work for Eggman and would become a gleeful participant in the genocide of the Echidna and other Angel Island inhabitants, capturing droves of poor souls to be sent to the Egg Grape Chambers, where they would perish in a slow, horrible fashion by having the very life drained of them. Though only a minor villain in the long run, his actions put him well beyond the point of redemption and into the realm of the truly malevolent, despite some pretensions earlier about having nobler characteristics.
- Dark Enerjak, the tyrannical ruler of another dimension, is actually a version of Knuckles the Echidna, fueled by a desire to make the world a better place, whose Chaos Powers went out of control. While he started out noble, he gradually went more and more insane as time went on, before he considered everyone an enemy. Among his atrocities are the sinking of a continent; the destruction of several enemy cities, such as Station Square, as punishment for their defiance; and the capture of his strongest opponents and ripping their souls out—victims include Sonic, Shadow, Tails, Amy, Sally, and all the villains. He turns the souls into robotic slaves known as "Prelates". His soulmate was one of his victims, and he made sure not to use her soul to form a Prelate until the final battle, when he summoned her to fight their daughter, much to said daughter's disbelief. Dark Enerjak's mainly motivated by his own amusement, despite saying how much of a hero he is at other times. He allowed the Freedom Fighters to exist to give him something to do, sent soldiers to other dimensions to try and find new worlds to conquer, and continued to indulge Silver because of his power to actually give the living God a challenge. He derives joy from people's suffering, as seen with how he forces his own daughter to fight her mother and his former mate and how, upon seeing how upset Silver is at Enerjak using the souls to make his Prelate Army, he summons them all at once.
- Dr. Julian Robotnik is the absolute ruler of a roboticized Mobius, and is a far more chilling incarnation of the normally-bumbling character of Robotnik. A ruthless, ambitious backstabber with a series of treacherous moves to his count in the name of self-interest, Robotnik's first betrayal was his sealing of the wizard Naugus in the Void. Later becoming known to the King of Mobius, Robotnik became instrumental in the King's own military victories before deciding to take over Mobius himself. Staging a coup d'état and overthrowing the King from Mobotropolis, Robotnik stole the technologies of the Roboticizer from Charles Hedgehog, and used it to forcefully convert almost all of Mobius into a polluted dystopia. Reducing all of Mobius's inhabitants to his robotic slaves—which they morally object to and fight against—Robotnik made fierce enemies with Charles's nephew Sonic and the rest of the Freedom Fighters. Robotnik would demonstrate his psychopathic nature again and again, attempting to kill, torture, or otherwise roboticize the Freedom Fighters, happily willing to jeopardize the ecosystem in doing so. Robotnik also coldly abuses his own minions, his diminutive, weak-willed nephew Snively among them, and condemns them all to die for the sake of his own life in the finale. An emotion-deficient fear-monger with nary a comedic quirk to his name, Robotnik proved one of the most vicious incarnations of Robotnik seen in the franchise.