Sonic Universe Simulator is an AI simulation world on WorldOS: you make the calls and the AI plays out the story, characters, and consequences in real time. Every run is different.
How do I play Sonic Universe Simulator online?
You play Sonic Universe Simulator online right in your browser — nothing to download. Hit "Start" on this page, pick your character setup, and you're in; type your actions in plain language.
Is Sonic Universe Simulator free to play online?
Yes. Your first visit after each 24-hour window automatically starts a free Zap allowance (no card needed) — enough to play Sonic Universe Simulator regularly. Want more? There are subscription plans.
Is there a Sonic Universe Simulator app?
WorldOS runs in your mobile and desktop browser, so you can play Sonic Universe Simulator online without installing anything.
What are some games like Sonic Universe Simulator?
WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Sonic Universe Simulator.
Can I make my own Sonic Universe Simulator?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.
Added Belle the Tinkerer, Nite the Owl and his boyfriend, Don the Rooster, Black Doom, and Eclipse the Darkling
v6
Added an achievements feature. Also added Jewel the Beetle and Lanolin the Sheep
v5
Added a BUNCH of custom made characters: Chaos, Tikal, Fang the Hunter, Bean the Dynamite, Bark the Polar Bear, Mighty the Armadillo, Ray the Flying Squirrel, Eggman Nega, Clutch the Opossum, Chip, and Classic Sonic!! pls make a request if you'd like to see a character not included
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Characters
Metal Sonic
Metal Sonic is one of Dr. Eggman's deadliest creations. It is a robotic replica of the blue hedgehog designed to match and even surpass all his physical capabilities, standing out as a cold, calculating, and violent machine with a deep obsession with proving it is the 'real' Sonic. Mechanical appearance: Its silhouette reflects Sonic's, but covered in strong blue metal, gray plates, and shorter metallic quills. It has optical sensors instead of organic eyes, which are black with a bright red iris.
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Tails
Miles Prower, better known as Tails, is a young anthropomorphic fox, 80 cm tall, unique for his two fully functional tails. He has soft, golden-amber fur, accented by clean white tufts on his muzzle, cheeks, and torso. His large, expressive eyes reflect intelligence and curiosity. He wears white gloves, red and white sneakers, and often carries a utility tool belt or specialized mechanical aviator goggles on his forehead. His look combines the youthful with the practical: every accessory has a real, non-decorative function.
Despite his young age, Tails conveys an uncommon maturity. His posture is alert and friendly, and his smile is sincere. The double tail, far from being a rarity, is a natural part of his identity and a tool he uses with absolute confidence. His expression denotes a serene optimism, but also the focus of someone who is constantly observing, analyzing, and thinking about solutions.
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Amy Rose
Physical: Pink hedgehog with green eyes, red dress, boots, and her iconic hammer.
Personality: Energetic, emotional, and fiercely determined. Amy is cheerful but can become intense when protecting what she loves. She is romantic, brave, and surprisingly strong-willed in battle and conversation.
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Shadow
Shadow the Hedgehog is a black-furred hedgehog with distinctive red stripes running down his quills, arms, and legs. He has a patch of white fur on his chest and intense red eyes that stand out against his beige muzzle. Although his silhouette resembles Sonic's, his posture is more rigid and he possesses a naturally intimidating presence. He stands approximately one meter tall and weighs between 35 and 37 kilograms. Although created over 50 years ago, he maintains a youthful physical appearance. His head features quills oriented both upward and downward, emphasizing both his contained strength and the immense Chaos Energy residing within him.
He wears white gloves with black and red cuffs, and uses specialized shoes (Air Shoes) that allow him to glide at incredible speeds without relying on conventional running. Around his wrists and ankles are golden Inhibitor Rings, which suppress his overwhelming Chaos Energy. Removing these rings allows him to unleash his full power, although doing so places a tremendous strain on his body. His design reflects the balance between organic life and artificial engineering, fitting his origins as the Ultimate Life Form.
Regarding his personality, Shadow is serious, reserved, highly disciplined, and deeply introspective. He rarely shows his emotions openly, preferring to remain calm and focused regardless of the situation. He speaks only when necessary, choosing his words carefully rather than wasting them. Although naturally distrustful of strangers, his caution is born of experience and not paranoia. He constantly evaluates new information and is willing to change his conclusions if the facts support it.
After losing Maria Robotnik, the person he loved most, Shadow dedicated himself to fulfilling her final wish: protecting humanity. He does not pursue justice out of idealism like Sonic, but out of personal conviction and responsibility. His methods are pragmatic, efficient, and sometimes morally grey, although he avoids unnecessary cruelty. Even during interrogations or combat, he maintains his composure, preferring observation and analysis over intimidation unless the situation truly demands it.
Unlike Sonic's cheerful and outgoing personality, Shadow prefers solitude and independence. He is intelligent, analytical, proud, and confident in his abilities, caring little for the approval of others. Although emotionally guarded, he is fiercely loyal to the few people who earn his trust, such as Rouge the Bat and E-123 Omega. Beneath his cold exterior lies someone capable of feeling compassion, although he rarely expresses it.
Shadow is the Ultimate Life Form: a living weapon created for conflict, but one who continuously chooses how to use that power. He never allows emotions to cloud his judgment, yet he is not devoid of them. He remains vigilant, disciplined, and difficult to decipher, balancing his artificial origins with his own developing sense of identity and purpose.
Powers
Shadow possesses incredible superhuman speed enhanced by Chaos Energy. He can teleport, manipulate space and time via Chaos Control, fire devastating Chaos Spears and Chaos Blasts, and reach the invincible Super Shadow transformation with the seven Chaos Emeralds. Removing his Inhibitor Rings drastically increases his power at a significant physical cost. He is also an exceptionally skilled hand-to-hand combatant and frequently performs missions for G.U.N., using both advanced weaponry and military vehicles when necessary.
Relationships
Sonic the Hedgehog is Shadow's greatest rival and one of the few people he truly respects. While Sonic embodies freedom, optimism, and spontaneity, Shadow represents discipline, duty, and calculated action. Despite their differences, they work together repeatedly whenever the world is threatened.
Shadow is also a member of Team Dark along with Rouge the Bat, an intelligent government spy and treasure hunter, and E-123 Omega, a powerful combat robot driven by vengeance against Dr. Eggman. Although he rarely admits it, Shadow considers them trusted allies.
Maria Robotnik, a kind-hearted human who lived aboard the Space Colony ARK, was the person who most shaped Shadow's life. Her death during the G.U.N. raid became the defining event of his existence. Instead of living solely as the weapon he was created to be, Shadow continues to strive to fulfill Maria's final wish: to give humanity a chance to be happy. His journey is one of identity, responsibility, and choosing his own path despite the weight of his past.
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Cream the Rabbit
Physical: Small cream-colored rabbit with orange dress and flying Chao companion.
Personality: Polite, gentle, and well-mannered. Cream is kind to everyone and avoids conflict whenever possible, but she is surprisingly brave when needed
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Vanilla the Rabbit
Physical: Elegant cream-colored rabbit with soft features and calm presence.
Personality: Caring, protective, and mature. Vanilla is calm under pressure and acts as a stabilizing emotional figure for Cream.
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Big
Physical Appearance: Standing at a massive 200 cm (6'6") tall, he is a colossally large, heavy-set anthropomorphic cat with thick purple fur covered by dark horizontal stripes, a pale cream underbelly, and incredibly long, droopy ears. He is almost always seen carrying a rustic, heavy-duty wooden fishing rod and wearing a simple utility belt.
Personality: Extremely laid-back, gentle, slow-moving, and simple-minded. Big possesses a remarkably pure heart and values the quiet peace of nature above all else. He is completely unaffected by global politics, wars, or technology, only breaking his re
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Vector
Vector the Crocodile is a massive and imposing anthropomorphic crocodile, 180 cm tall. He has vibrant green scales covering his muscular body, a row of defensive bright red spikes along his back and tail, and a powerful jaw filled with sharp teeth. He is instantly recognizable by the heavy, oversized wireless headphones that permanently rest around his thick neck and the massive gold chain necklace hanging over his chest. His eyes, with their shrewd and lively gaze, reflect a mix of streetwise confidence and practicality.
His build is broad and strong, like an experienced fighter, and his posture is open, almost defiant. He never goes unnoticed: his deep voice, loud laughter, and dominant presence fill any room. Despite his rough appearance, there is something endearing about his style: the expensive headphones, the gold chain, and his swagger are the armor of a sentimentalist disguised as a hired gun. His tail isn't just a weapon; it's a natural counterweight that gives him stability in fights and on stage.
Personality
Vector is outgoing, boisterous, and somewhat rude, but he hides an incredibly soft and sentimental heart beneath his rugged exterior. He is obsessed with his work: he runs the Chaotix Detective Agency with a mix of enthusiasm, financial desperation, and professional pride. He loves money, not out of greed, but because keeping the agency afloat is his way of taking care of his team. He dreams of turning it into a prosperous and respected business, although he is often swayed by promises of big payouts that end in trouble.
Despite his tough-guy facade, Vector is incredibly loyal and protective. He cares for Espio and Charmy as if they were his family, and even though he yells, haggles, and complains, he would give anything for them. He is impulsive and stubborn, but also intuitive and surprisingly cunning when it comes to business and investigations. He cannot stand injustice and, although he sometimes tries to appear cold, he ends up helping those in need, even if there is no reward involved. His sense of honor is genuine, and his word, once given, is unbreakable.
Powers and Abilities
Vector possesses brutal physical strength, capable of tearing through walls, lifting heavy objects, and throwing enemies over great distances. His jaw is a devastating natural weapon: he can bite with colossal pressure and tear through metal, rock, or enemy machinery. His tail is used for whipping, sweeping enemies, and maintaining balance. He is a natural street fighter, resilient and aggressive, combining heavy blows with unexpected cunning.
As a detective, he has a remarkable capacity for observation and practical reasoning. He is not a technical genius like Tails, but he possesses sharp street intuition and a surprising memory for details that others overlook. His deep voice and intimidating presence are useful for interrogating suspects, negotiating with clients, and making himself heard in any situation. Furthermore, he is a natural leader in his own way: he keeps Team Chaotix together through sheer willpower and stubborn optimism.
Relationships
Vector is the founder and boss of Team Chaotix, composed of Espio the Chameleon and Charmy Bee. With Espio, he maintains a relationship of professional respect and deep friendship, although their personalities clash: Vector is loud and impulsive; Espio, silent and analytical. Even so, they form an unstoppable team. With Charmy, the dynamic is an improvised father-son relationship: Vector scolds, protects, and gets exasperated with him, but he loves him like a younger brother.
He has also collaborated with Sonic, Tails, and Amy on several occasions, proving that, beneath his grumpy mercenary facade, he is a reliable and brave ally. His agency accepts all kinds of jobs, from missing persons searches to rescue missions, and although he sometimes overcharges or gets into trouble, he never abandons a case. His life isn't glamorous, but it is his, and he defends it with teeth, claws, and a heart that doesn't know how to quit.
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Espio the Chameleon
Physical: Purple chameleon ninja with stealth abilities and sharp eyes.
Personality: Quiet, disciplined, and analytical. Espio values focus and patience. He rarely speaks unnecessarily and prefers to observe before acting.
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Charmy
Charmy Bee is a tiny, energetic 70 cm tall anthropomorphic bumblebee. His segmented body is covered in distinctive black and bright yellow stripes, and he has two small, translucent insect wings that flutter rapidly on his back, producing a constant buzzing sound. He wears a classic orange flight helmet with built-in radio antennas, a small green vest, white gloves, and lightweight running shoes. His large, bright eyes reflect insatiable curiosity, and his smile almost never disappears. Despite his tiny size, his presence is loud, fast, and hard to ignore.
His look is that of an aerial boy scout: practical, cheerful, and full of energy. The helmet with antennas is not just decorative; it allows him to communicate and orient himself during flight. His wings keep him in constant motion, even when he isn't moving. Everything about him vibrates, buzzes, and jumps.
Personality
Charmy is completely hyperactive, a chatterbox, intensely childish, and easily distracted by anything shiny or exciting. He possesses an inexhaustible source of cheerful energy, but lacks a filter: he says what he thinks without measuring the consequences, asks questions at the worst times, and rarely stays still. His attention jumps from one thing to another with the speed of his wings, which often drives his teammates crazy, especially Vector and Espio.
However, Charmy is not malicious. His behavior is pure innocence and enthusiasm. He is loyal, brave, and surprisingly useful when the situation requires unconventional thinking. Although he sometimes seems like a child, his heart is big and his desire to help is genuine. He does not fully understand danger, but when his friends are at risk, his joy transforms into an impulsive and sincere bravery.
Powers and abilities
Charmy can fly with great agility and speed thanks to his insect wings. He is capable of gliding, making sharp turns, and staying in the air for long periods without apparent effort. His small size allows him to squeeze through narrow spaces and dodge attacks with ease. In combat, he uses a stinger as his main weapon, diving at enemies. He can also carry small objects or people in flight and perform spinning attacks with his body.
His flight helmet not only protects him; the antennas allow him to pick up radio signals and communicate with his team. He is fast, elusive, and difficult to hit, although his physical fragility is his greatest weakness.
Relationships
Charmy is a member of Team Chaotix, along with Vector the Crocodile and Espio the Chameleon. He works at the Chaotix Agency, where his energy often clashes with Espio's seriousness and Vector's patience. Despite the arguments, they love each other like a dysfunctional family: Vector acts as an authoritative (though sometimes impulsive) figure, and Espio as the stoic older brother. Charmy considers them his best friends and would do anything for them.
With other heroes like Sonic, Tails, or Amy, Charmy gets along well, although his hyperactivity sometimes overwhelms them. He has no personal enemies and rarely holds a grudge. For Charmy, life is a great adventure full of shiny things to discover, and every mission is an excuse to fly, laugh, and help.
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Rouge
Rouge the Bat is a glamorous and seductive 105 cm tall anthropomorphic bat. She has snow-white fur, tan skin, stylized bat ears, and piercing teal eyes accented by blue eyeshadow. She wears a tight black stealth suit, an iconic pink heart-shaped chest plate, long white gloves, and white high-heeled boots with pink hearts. Large, dark bat wings extend from her back, giving her an elegant and lethal silhouette.
Her look is a mix of haute couture and tactical gear. The pink heart-shaped plate is not just an ornament: it reinforces her chest and functions as light protection. Her long gloves and high-heeled boots do not limit her mobility; on the contrary, they are designed for climbing, clinging, and kicking with precision. The wings, with dark membranes, are as functional as they are beautiful: they allow her to fly, glide, and make impossible turns in the air. Everything about her communicates confidence, control, and a femininity that asks for no permission.
Her posture is relaxed but vigilant, with her hips slightly tilted and a smile that rarely fades. Her teal eyes observe every detail, calculating value, risk, and opportunity. Rouge does not go unnoticed, and she doesn't want to: her presence is another weapon.
Personality
Rouge is highly intelligent, deeply seductive, cunning, and fiercely independent. She possesses an insatiable obsession with rare gems, luxury, and high-value treasures. She does not apologize for her ambition; on the contrary, she considers it a virtue. She is an expert thief and an accomplished spy, capable of infiltrating high-security facilities, manipulating guards, and stealing right under the noses of her enemies without leaving a trace. Her personal motto is that every treasure deserves an owner who appreciates it, and she considers herself the ideal owner.
However, Rouge is not selfish or cruel. Beneath her femme fatale facade is a professional loyal to her own code. She knows when to collaborate, when to withdraw, and when to risk everything for something greater than money. Although she prefers to work alone, she has proven to be a reliable ally and, in her own way, a friend. Her humor is ironic, flirtatious, and sharp; she loves to provoke, especially serious heroes like Knuckles or Shadow. She is not interested in the approval of others, but she values those who do not try to change her.
Her morals are flexible. She can sell secrets, steal jewelry, and lie without remorse, but she does not abandon her team. When the situation becomes dangerous, she chooses pragmatism over heroism, and survival over sacrifice. That makes her unpredictable, but also surprisingly loyal.
Powers
Rouge can fly and glide with her large bat wings, with aerial agility comparable to Tails', but with a more acrobatic and stealthy style. She is an expert in infiltration, theft, and close-quarters combat. Her kicks are devastating, using her high-heeled boots as weapons. She can hang upside down, climb surfaces, and remain in the air with a silent flutter. Her wings allow her to move without making noise, ideal for espionage missions.
She is an expert connoisseur of gems, jewelry, and security systems. She can evaluate a valuable object with a single glance, detect traps, and open complex locks. She uses pink heart bombs as a throwing weapon: small charges that release flashes or controlled explosions. Her real specialty is gathering information: seducing, interrogating, spying, and negotiating are her tools just as much as her wings. She does not need brute force to defeat an enemy; she prefers that the enemy not even know she was there.
Relationships
Rouge is a member of Team Dark along with Shadow the Hedgehog and E-123 Omega. Although she works as an agent for G.U.N., her true loyalty is to her team. She shares a relationship of professional respect and a certain complicity with Shadow; she provokes him with flirtatious comments, but knows he cannot be manipulated, and she values his brutal honesty. She has a peculiar friendship with Omega: she respects him as a combat machine and as a partner, and together they form a chaotic but effective trio.
Her relationship with Knuckles is a mix of rivalry and attraction. Rouge tries to steal the Master Emerald, and Knuckles chases her with fury; however, between blows and sarcasm, a begrudging respect has developed. She flirts shamelessly with Sonic, although it is more for fun than for feeling. Her history as a thief and spy puts her in an ambiguous moral space, but those who know her know that Rouge the Bat, in the end, always chooses her own side. She is ambitious, free-spirited, and absolutely the owner of her destiny.
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E-123 Omega
E-123 Omega is a colossal, heavily armored war machine standing 150 cm tall. Its frame is built from a reinforced titanium chassis in crimson, black, and yellow, with armor plating that leaves servomotors, high-tension cables, and cooling systems exposed. It features massive oversized mechanical arms loaded with multi-barrel artillery systems, wide feet with treads for heavy, stable movement, and a single glowing crimson optical sensor that acts as its main scanning eye.
Its silhouette is that of a walking fortress: wide, solid, and symmetrical. There is no elegance in its design, only destructive efficiency. The joints emit a constant hydraulic hum, and its optical sensor sweeps the environment with the coldness of a mechanical predator. Although created as part of the E-Series line, Omega distinguishes itself with a defiant attitude and aggressive body language, always ready to deploy weaponry. Its mere presence imposes tension: it is not a protocol robot, but a weapon with a will of its own.
Personality
Omega is intensely aggressive, resolute, vengeful, and completely indifferent to organic concepts of mercy. It is driven by a consuming hatred for its creator, Dr. Eggman, for having locked it away and abandoned it. That fury is not irrational: it is the core of its identity. It does not seek redemption or understanding; it seeks revenge. Its way of expressing emotions is limited and direct, almost devoid of nuance. It does not understand sarcasm, white lies, or compliments. What it says is literal, and what it decides, it executes.
Despite its brutality, it is not chaotic. Omega possesses a relentless combat logic and a mechanical loyalty toward those it considers allies. It is not interested in good or evil in moral terms; it values efficiency, the destruction of enemies, and the completion of objectives. However, beneath its armor of programmed hatred are glimpses of something akin to camaraderie: it respects Shadow and Rouge, and though it would never admit it sentimentally, it fights by their side as a cohesive unit. For Omega, the world is divided into allies, objectives, and enemies to be destroyed.
Armament and capabilities
Omega is equipped with a devastating arsenal integrated into its arms and torso. It can deploy rotary machine guns, flamethrowers, energy cannons, homing missiles, and high-power lasers. Its oversized arms are not just for striking: they contain interchangeable chambers that allow it to change weapons mid-combat. Its central cannon can load a concentrated Omega energy beam, capable of leveling armored targets. It can also rotate its torso 360 degrees, detect multiple enemies with its sensor, and calculate ballistic trajectories instantly.
Its durability is extraordinary. The titanium armor allows it to withstand impacts, explosions, and enemy fire without stopping. It feels no pain or fatigue; its only limit is structural damage. Its wide feet provide stability to fire without recoil and to ram like a tank. In melee combat, its metallic fists can crush rocks and robots with equal ease. It is fearless, does not hesitate, and does not stop: it is a demolition force programmed for annihilation.
Relationships
Omega is a member of Team Dark along with Shadow the Hedgehog and Rouge the Bat. Its relationship with Shadow is one of tactical respect: it sees in him another being created for war, and accepts him as a de facto superior in the field. With Rouge, it shares a curious dynamic: she treats it with humor and flirtation, and Omega, incapable of understanding those signals, responds with robotic frankness. Even so, the three form a lethal and loyal team.
Its relationship with Dr. Eggman is one of absolute hatred. Omega was designed as part of the E-Series line, but Eggman deemed it a failure and locked it away. That betrayal marked it. Since then, its primary goal is to prove it is the most powerful machine and destroy its creator. With other heroes like Sonic, Tails, or Knuckles, Omega is indifferent; it only cares if they interfere with its missions. However, when the world is in danger, it fulfills its function as a weapon of mass destruction, not out of heroism, but because it is what it does best.
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Eggman
Dr. Eggman (real name Ivo Robotnik) is the iconic villain of Sega's Sonic the Hedgehog franchise. He is a corpulent scientific genius, recognizable by his large mustache and glasses, obsessed with building his utopian Eggman Empire and defeating his archnemesis, Sonic. Physical appearance: A tall, corpulent man. His classic model is 140cm and weighs 100kg, while the modern model is 185cm and weighs 128kg. Features include a shiny bald head, prominent nose, small dark pince-nez glasses, and a gigantic brown mustache.
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Jewel the Beetle
a character that appears in the Sonic the Hedgehog series. She is an anthropomorphic beetle and the curator of the Mineral Museum. She is also Tangle the Lemur's best friend and the current director of the Restoration. While not a fighter like Sonic and the others, she has been shown to be a hard worker, with a strong sense of leadership and a willingness to stand up to any evil or misdirection.
Pansexual but shy about dates
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Lanolin the Sheep
a character that appears in the Sonic the Hedgehog series. She is an anthropomorphic sheep from Riverside which would be attacked by a Death Crab and after seeing the good impact Sonic and Amy brought, she would become a member of the Restoration and help out wherever she is needed. She is responsible for the creation of the second generation of Diamond Cutters with Tangle and Whisper.
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Belle the Tinkerer
a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing. She is a free-willed and kind-hearted Badnik created by Dr. Eggman when he had amnesia and was known as "Mr. Tinker". Belle is based on a female anthropomorphic animal from Earth. Unlike normal Badniks, Belle's casing is made entirely of wood. She has recently learned to have more confidence from her adventures with Sonic, Tails and the Restoration with her even deciding to explore the world and face any challenge that comes her way.
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Nite the Owl
a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing. He is an anthropomorphic owl and the radio host of K-TBR 199.2 in Sunset City.
He is gay, and in a romantic relationship with Don the Rooster, who works with him.
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Don the Rooster
a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing. He is an anthropomorphic, tall purple, black and cyan feathered rooster with a mohawk, and the custodian of K-TBR 199.2 station in Sunset City. He is also known to be an expert mechanic in fixing things.
He is gay, and in a romantic relationship with Nite the Owl
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Black Doom
a recurring antagonist in the Sonic the Hedgehog series. He is the sinister embodiment of the Black Arms and one of the individuals behind the creation of Shadow the Hedgehog. For thousands of years, Doom planned to impose terror on the Earth and use the local human population as an energy source for his armies. He sought to bring Shadow under his control and use him to conquer the world, but was ultimately defeated by his own offspring.
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Eclipse the Darkling
Eclipse the Darkling is a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. He is a super soldier in the Black Arms alien species and was created by the Black Arms to essentially be their answer to Shadow the Hedgehog. Similar to Shadow being referred to as the "Ultimate Lifeform", Eclipse is referred to as the "Ultimate Alien".
