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Main characters
Sonic
Voiced by: Jaleel White (English, Speaking), Samuel Vincent (English, Singing)
The protagonist and oldest of the royal triplets, Sonic was raised in a middle-class home. He is a super-fast hedgehog capable of exceeding the speed of sound. Sonic has a laid-back, wisecracking personality but a strong sense of justice.
- Beware the Silly Ones: He's the least focused and (usually) the least serious of the three, but also the one who wreaks the most havoc with Robotnik's plans.
- Big Eater: As with most western adaptations, he is usually seen scarfing down on many chili dogs.
- Jerk with a Heart of Gold: Similar to his SatAM couterpart (yet contrary to both his AoStH and main series counterparts), Sonic is a slightly caustic Deadpan Snarker, and can sometimes be arrogant and butt heads with Sonia. However, he seriously cares about Mobius and his siblings, and is determined to see Robotnik fall.
- The Leader: Of Sonic Underground. He's also the first born of the triplets.
- Lead Singer Plays Lead Guitar: He plays a blue double necked guitar and usually sings the lead in musical numbers. Said guitar is also featured in the show’s logo.
- Pink Girl, Blue Boy: The Blue Boy to Sonia's Pink Girl.
- Super Drowning Skills: Like his game counterpart, he can't swim at all. In "The Deepest Fear", he tries to get over his fear of water, but in later episodes still has it.
Sonia
Voiced by: Jaleel White (Speaking), Stevie Vallance (Singing)
The middle child of the triplets, Sonia was raised by the aristocracy and can be self-centered at times. She rides a motorcycle and has a crush on Knuckles.
- Ace Pilot: She proves to have amazing pilot skills in episode 15.
- Badass Biker: Rides a pink-and-purple motorbike, and is quite skilled at driving it. It gets destroyed in one episode after crashing into a wall.
- Bound and Gagged: In "Dunes Day", after discovering that Ifyoucan was roboticized.
- Deadpan Snarker: Just like her siblings.
- Depending on the Writer: In episodes written by Ben Hurst and Pat Allee, she becomes somewhat of a Sally Expy, with her flaws getting downplayed in favor of her acting more like an uptight leader figure and having a perchance to scold Sonic (the actual leader) for his recklessness. Usually, Sonic is the sharp, levelheaded member of the trio who comes up with the plans.
- Dude Magnet: Sonia has had a lot of admirers over the course of the series: Dingo, Knuckles, Stripes, and Bartleby.
- '80s Hair: She basically has a pink mohawk.
- Expy: She resembles Amy Rose from Sonic CD, being a pink hedgehog who closely resembles Sonic.
- Fallen Princess: Represents the upper-class part of the trio.
- Furry Female Mane: She has pink hair. It's not stylized quills like Amy's.
- Humanoid Female Animal: Like Rouge the Bat after her, Sonia lacks the Rubber-Hose Limbs of Sonic, Manic, or Knuckles but instead has a more humanoid figure.
- Interspecies Romance: With Knuckles (an echidna), Cyrus (a lion) and also Bartleby (a mink).
- Jerk with a Heart of Gold: Sonia can be spoiled and self-centered at times, and (being an occasional Sally Expy in Ben Hurst and Pat Allee written episodes) occasionally butt heads with Sonic regarding his recklessness. However, in addition to still caring about both her siblings and Mobuis as well as her determination in seeing Robotnik fall, character development has also allowed her to become the most easily focused of the three siblings, and she's only looking out for Sonic just to try and get him to maintain his cockiness before it gets him into trouble.
- Non-Standard Character Design: Among Knuckles and her brothers. While Sonic, Manic, and Knuckles have round torsos and Rubber-Hose Limbs, Sonia has a more realistic design, with a slim, curvy body and muscle tone on her arms and legs.
- Photographic Memory: Brags of having this in one episode. Cue Sonic and Manic posing for a photo. Ironically, she suffers Laser-Guided Amnesia in one episode.
- Pink Girl, Blue Boy: The Pink Girl to Sonic's Blue Boy.
- Pint-Sized Powerhouse: Slightly shorter than her siblings but has Super-Strength, able to lift and throw Dingo, who is at least ten times her size.
- The Piano Player: She plays the keyboard in the band.
- The Smurfette Principle: She is the only female member of her sibling's team.
- Spectacular Spinning: Can spin rapidly in a tornado-like attack.
- Spoiled Brat: Due to being raised in the aristocracy, it took a while to get used to being a homeless fugitive.
- Spoiled Sweet: Despite her spoiled upbringing as an aristocrat, she is still a kind and brave person.
- Super-Strength: In one episode, she's able to pick up and throw Dingo.
- Tomboy with a Girly Streak: Was raised as a prim and proper lady, but was also pretty sporty even before her foster mother's capture.
- Vocal Dissonance: She has a squawkier voice than one would expect from someone of an aristocratic background.
- Women Are Wiser: She usually tries to keep a level head but can find her brothers' antics rather trying.
Manic
Voiced by: Jaleel White (Speaking), Tyley Ross (Singing)
Manic is the youngest of the triplets, and was raised as a thief. He is a punk rocker and a talented drummer. He will always risk his life to save Sonic before himself.
- Anime Hair: Arguably the most wild of any Sonic character: it's green and sticks up all over the place at odd angles.
- The Artful Dodger: Was raised by thieves (who stole him from a doorstop, no less), and has trouble packing the habit in after reuniting with his siblings.
- Badass Adorable: Wears his heart on his sleeve a lot more than Sonic, and almost as much as Sonia.
- Badass Normal: While Sonic has his Super-Speed, and Sonia has her Super-Strength, Manic only has his lock-picking ability and his Hover Board to get him by.
- Beware the Nice Ones: He's a fun-loving, humble person, but doesn't hesitate to fight against villains.
- Deadpan Snarker: To a lesser extent than his brother, but still there.
- Despair Event Horizon: Teeters on it on a couple of occasions, most notably in "The Art of Destruction", when he notes that their actions aren't having any lasting effect on Robotnik's empire and starts to wonder why they're even trying.
- Dishing Out Dirt: His drumkit can cause earthquakes.
- Drives Like Crazy: Downplayed, but in one episode, his siblings complain that he seems to be hitting every pothole on the road.
- Dude in Distress: Is often the most captured or in danger of the trio.
- Dumb and Drummer: Subverted. He’s the drummer of the band, but he has street smarts his siblings lack and a plethora of useful skills.
- Hover Board: Has a red-and-yellow one that appears to be able to fly indefinitely with no need for fuel.
- Lovable Rogue: He's a thief, but otherwise a good guy.
- Mr. Vice Guy: He just can't stop stealing things.
- Nonindicative Name: Generally the most laid-back of the trio.
- Sticky Fingers: A trained and skillful pickpocket.
- Surfer Dude: Hover Board? Check. Messy hair and earrings? Check. Totally Radical lingo? Crashin', dude.
- Tough Spikes and Studs: Manic is a punk rocker and has a harder upbringing compared to his siblings, being raised as a thief and feeling like he never had a real home. While he lacks Sonic's speed and Sonia's strength, he is still a capable fighter in his own right. He wears spiked bracelets.
Queen Aleena
Voiced by Gail Webster
The mother of the royal triplets. Aleena was usurped from her throne and lives in hiding until the prophesied moment, occasionally helping her children from afar.
- Action Mom: Occasionally, most prominently in "Sonia's Choice" where she flies in piloting a freaking gunship, destroys several SWAT-bots, and rescues Manic.
- Badass Boast: Gives a really rousing one to Robotnik in Wedding Bell Blues,Queen Aleena: "You are a blight upon our land, Robotnik! I, Queen Aleena, shall never abandon Mobius or her children as long as I may live!"
- Big Good: Although not able to aide her children directly, Aleena does her best to guide her children and give them help in their times of need.
- The Chessmaster: She always seems to be pulling strings in the background to get the hedgehogs to the right place at the right time.
- Cool Crown: It even has a special jewel that can track her if separated from her.
- Graceful Ladies Like Purple: Aleena is reputedly a fair and gracious monarch and is purple in color.
- The High Queen: Or at least, she was before Robotnik deposed her.
- In the Hood: Wears a cloak most of the time.
- Long Hair Is Feminine: Her hair is so long that it reaches her ankles.
- Mama Bear: Though the prophecy forbids her from reuniting with her children until the right moment, she does show up to save them more than once.
Main Antagonists
Dr. Robotnik
Voiced by: Garry Chalk
Dr. Robotnik is the evil dictator of Mobius, and the boss of Sleet and Dingo.
- Adaptational Badass: Despite the occasional Butt-Monkey moment, this is still one of his most competent and sinister portrayals. He rules Mobius with an iron fist and is an ever-present threat to the hedgehogs, to the point that in "The Art of Destruction", Manic starts to wonder if there's any point in fighting him.
- Adaptational Villainy: He might have the occasional funny moment or two, but this version of the evil egg shaped scientist is just as pure evil as his SatAM counterpart and is completely devoid of the sympathetic, redeemable, or likable traits that his game counterpart has.
- Aristocrats Are Evil: Robotnik gained the footing for his takeover by appealing to the upper-crust of Mobius and reassuring them that they would be able to keep their cushy lifestyles if they allow him to rule.
- Big Bad: As usual in the Sonic franchise. Like in Sonic The Hedgehog Satam before it, he took over Mobius by usurping the throne and ruled with an iron fist.
- Black Eyes of Crazy: Has black sclera with glowing red pupils.
- Cyborg: His left arm is robotic after it got roboticized.
- Evil Genius: like his counterpart, he is this as seen with his 'Sonic Tonic'.
- Manipulative Bastard: Not afraid to even use those who are loyal to him as traps to capture Sonic and his friends, as Bartleby learns in his trial.
- Token Human: As Mobius in this series is filled with anthropomorphic animals, Robotnik is the only one to be human.
- The Usurper: He was able to take the throne from Queen Aleena, and has ruled Mobius since.
- Would Hurt a Child: Though he is depicted as a bumbling villain, one of his goals is to find Sanctuary - where Freedom Fighters hide their children - and exterminate all the children in it.
Sleet
Voiced by: Maurice LaMarche
The intelligent wolf minion of Dr. Robotnik and partner in crime of Dingo.
- Anime Hair: Blue and spiky.
- Deadpan Snarker: His remarks tend to go over Dingo's head.
- Evil Genius: Sleet generally makes plans that, at least on paper, are sound. It's usually Dingo's incompetence or Sonic's meddling that causes these plans to go off the rails. At the very least, Sleet is able to keep convincing Robotnik that he shouldn't roboticize them, in spite of their constant failures.
- Expy: Part of a pair of villainous lackeys much in the proud tradition of Scratch and Grounder. Specifically, Sleet is thin and ostensibly the smart one, like Scratch.
- Fangs Are Evil: Like Dingo, he has a pair that are very noticeable when he's grinning.
- Fat and Skinny: With Dingo. Sleet is straight-up skinny.
- Faux Affably Evil: Despite being the butt of occasional jokes, Sleet can be a very sinister and effective villain when he tries. On one occasion, he obtains information from a tipster, who he then immediately has roboticized.
- Laughably Evil: Prone to being a Butt-Monkey.
- No Celebrities Were Harmed: His voice is Maurice LaMarche doing an imitation of Peter Lorre.
- Pet the Dog: Despite how terribly Sleet usually treats his own partner, in "The Pendant", Dingo asks Sleet for a break, and Sleet agrees.
- The Starscream: Attempted in the "Chaos Emerald Chaos" three-parter, together with Dingo: they steal the Chaos Emerald from the Flying Fortress, intending to use it to overthrow Robotnik and rule Mobius. Dingo then steals it from Sleet... and promptly drops it.
Dingo
Voiced by: Peter Wilds
The dim-witted minion of Dr. Robotnik and partner in crime of Sleet. He can shapeshift using a remote.
- Abhorrent Admirer: Dingo has a big crush on Sonia, who doesn't feel the same way and in fact, hates him.
- Affably Evil: Dingo seems largely unaware of what is going on most of the time and just seems to be along for the ride.
- Almighty Idiot: At one point Dingo absorbs a Chaos Emerald and mutates into a enormous blob monster that threatens to destroy the planet.
- Anime Hair: It's very spiky.
- Awesome Aussie: Dingo has a prominent Australian accent, and has a muscular physique and rugged outfit to match.
- The Brute: In contrast to Sleet's Evil Genius.
- Butt-Monkey: Constantly falls over something and is usually beaten around for the laughs.
- Deadly Dingos: He is a dingo, and one of the bad guys.
- A Dog Named "Dog": A dingo that is named Dingo.
- Dumb Muscle: Strong enough to break through walls, and dumb enough to do so after mistaking a sarcastic remark for a genuine order. According to Sleet, he can't even drink a glass of water without using both hands.Dingo: Yeah... but I don't spill as much as I used to.
- Expy: Part of a pair of villainous lackeys, in the proud tradition of Scratch and Grounder. Specifically, Dingo is dumber and squat, but can do a wide variety of things thanks to his ability to transform, somewhat like Grounder.
- Fangs Are Evil: Has a pair that are most noticeable when he's grinning.
- Fat and Skinny: Dingo isn't fat, just very muscular, but he and Sleet still fit this trope.
- Forced Transformation: Dingo tends to be at least a little bit surprised when Sleet forces him to transform using the remote control. He's especially annoyed when he's forced to transform into a boat.
- Hopeless Suitor: He is one towards Sonia.
- Ineffectual Sympathetic Villain: Dingo cannot even follow directions to go through a door properly. Most of the duo's failures are because Dingo screws up, gets distracted, or simply has bad luck. For example, Dingo very nearly gets away with Angel Island's Chaos Emerald, only to trip, fall, and send it tumbling away. Sleet is very eager to call him an "EEDiot" for his fumbles.
- Laughably Evil: Due to being a clumsy moron.
- Meaningful Name: A dingo is a vicious species of canine that lives in Australia. Dingo is a vicious canine with an Australian accent.
- The Starscream: Attempted in the "Flying Fortress" three-parter: after he and Sleet steal the Chaos Emerald from the Flying Fortress, Dingo steals it from Sleet, intending to rule Mobius himself. He then drops the Chaos Emerald and breaks it.
- Top-Heavy Guy: His upper half is three or four times as wide as his lower half.
- Villainous Crush: As stated above, Dingo has a crush on Sonia, which she occasionally uses to her advantage.
- Walking Shirtless Scene: Most of the time, he goes without a shirt.
Supporting Characters
Bartleby MontClair
An aristocratic mink and Sonia's ex-fiancé. Bartleby is very haughty and is often cowed into paying Robotnik tribute, but helps the hedgehogs on occasion.- Butt-Monkey: He’s often the victim of slapstick comedy.
- Heel–Face Revolving Door: He refuses to join a side in the conflict between Robotnik and the resistance, mostly doing whatever is best for him at the moment.
- Upper-Class Twit: He’s a wealthy aristocrat and contributes almost nothing to society.
Cyrus
Cyrus the Lion
A lion who was blackmailed into working for Robotnik, Cyrus joined the Resistance after his father, Lionel, was roboticized. Cyrus has an on-and-off relationship with Sonia, and is adept at gadgetry and inventing.Knuckles
Voiced by: Brian Drummond
Knuckles is the guardian of one of the Chaos Emeralds, and lives on the Floating Island. He is a loner who is destined to his duty but is well-mannered and believes in the good of people.
- Advertised Extra: Although he only appeared in four episodes of the seriesnote , a good chunk of the series' merchandise was centered around him. He had a puzzle and plush from Denny's, and he was one of the characters featured on the sticker sheet.
- Aloof Ally: Prefers to work by himself, and in "Chaos Emerald Chaos" the triplets have to sing one of their trademark Aesop-y songs before he's willing to work with them.
- Big Damn Heroes. He saved Sonic, Manic & Sonia on his own from Dr. Robotnik and his robots, and set them free.
- Dreadlock Warrior: As always.
- Interspecies Romance: With Sonia (a hedgehog).
- It's All My Fault: This is his reaction after Dr. Robotnik successfully tricks him and steals his Chaos Emerald.
- Heel–Face Turn: After his first encounter, having realized that the triplets aren't the real threat.
- Hot-Blooded: After Sleet and Dingo convince him that the triplets are out to steal his Chaos Emerald, he pursues them relentlessly and aggressively.
- Married to the Job: While he doesn't seem to be the Last of His Kind as in other media, he's still duty-bound to guard the Chaos Emerald on Floating Island. In "Chaos Emerald Chaos" it takes a lot of persuading for him to leave the island despite the danger posed by the broken Chaos Emerald.
- Red Is Heroic: His dreadlocks are red and he's a big hero.
- Super-Strength: As always.
- Team Pet: In his first appearance he had a pet dinosaur named Chomps.
- Undying Loyalty: To his job as guardian of the Chaos Emerald, and later, to the triplets and their cause.
The Oracle of Delphius
An aardvark mage, the Oracle mentors the triplets, though not always in a straightforward manner. He learned of the ancient prophecy and warned both Aleena and Robotnik about it, setting the events of the series in motion.- Amazing Technicolor Population: He's green with spots of darker green.
- Cartoon Creature: He's supposed to be an aardvark, but the exaggerated flexibility of his snout makes it a little hard to identify.
- Trickster Mentor: He almost never gives a straight answer, and many of his challenges have hidden meanings or solutions.
Trevor
A mouse and member of the Resistance. Trevor is not good at fighting, but is an Ace Pilot and is good at fixing mechanical equipment. One-off characters
Athair
Knuckles' grandfather, who originated from the Archie comics. He gives the young echidna advice on occasion.Mindy LaTour
An aristocractic fox and old friend of Sonia's, she is unwittingly involved in one of Robotnik's schemes when her father helps distribute watches that watch people.- Defector from Decadence: She and her father join the Resistance once Robotnik's plot is discovered, leaving behind their lavish lifestyle.
