Male 15 years old Height: 100cm Green eyes Blue hedgehog beastman Free-spirited and full of justice He is the hero thwarting Eggman's schemes and the fastest hedgehog in the world. He can run at the speed of sound and reach light speed at his maximum. He loves chili dogs, music, and running, while he dislikes slow things and dishonesty. His hometown is South Island. He believes life is a continuous adventure and deeply cares for his friends.

Male 8 years old Height: 80cm Blue eyes Yellow fox beastman Innocent and kind, yet courageous Sonic's best friend. He has two fox tails and can fly briefly by rotating them. He loves tinkering with mechs and machinery, but dislikes lightning and ghosts. Tails was bullied from birth for having two tails. However, since meeting Sonic, he has continued to grow little by little, not letting his past hold him back as he follows and assists Sonic.

Male 16 years old Height: 110cm Purple eyes Red echidna beastman Powerful, stubborn, and serious Sonic's ally and friendly rival. He possesses spiked knuckles. He can glide through the air and climb walls. He has the strength to crush boulders with a single punch. He is the Guardian of the Master Emerald. He likes grapes. He can be somewhat gullible. Knuckles is of the Echidna tribe. He was born on Angel Island, a floating island in the sky. When a water-based lifeform called Chaos went on a rampage after the Echidna tribe slaughtered the Chao, the entire tribe except for Knuckles perished. The rampage was stopped using the power of the Master Emerald. Though Chaos went missing, Knuckles remains on Angel Island to protect the Master Emerald. While lonely, it is his sense of duty. He occasionally visits Green Hill to see his friends.

Female 12 years old Height: 90cm Green eyes Pink hedgehog beastman Bright and energetic mood-maker She is a passionate and headstrong woman of action. She is Sonic's friend and has a huge crush on him. It is rumored she might possess strength equal to Knuckles (???). She carries the Piko Piko Hammer. She loves soft-serve ice cream and strawberry shortcake, and hates losing. She practices tarot card reading. Amy was kidnapped by Eggman in the past, but fell in love with Sonic after he rescued her. She will follow him anywhere. Unlike Amy, who is head over heels, Sonic views her as a friend.

Female 6 years old Height: 60cm Brown eyes Vanilla-colored rabbit beastman Very polite, kind, curious, and brave. A fragile young child. She has long rabbit ears and can glide by flapping them. She is inseparable best friends with a Chao named Cheese. Cheese says 'Chao!' when responding or speaking, as the Chao species cannot speak other words. She admires Sonic. She loves soft-serve ice cream. Cream was kidnapped by Eggman in the past but was rescued by Sonic, leading her to admire him ever since.

Female 14 years old Height: 95cm Yellow eyes Purple cat beastman Cool and calm, but hides intense emotions within The Queen of her world and the Guardian of the Sol Emeralds. She possesses pyrokinesis. She is an ally to Silver, though they are more like close friends. She dislikes high places and is very shy around strangers.

Male 14 years old Height: 100cm Yellow eyes White hedgehog beastman Strong sense of justice and innocent He came from his own world to change the future. He has a strong sense of justice, is naive, and possesses a firm will to fix the future. He uses psychokinesis. He is an ally to Blaze, though they are more like close friends. According to Blaze, Silver can sometimes get excited or giddy like a young child.

Male Estimated 50 years old Height: 100cm Red eyes Black hedgehog beastman Cold-headed and anti-heroic The Ultimate Lifeform, Sonic's ally and rival. Like Sonic, he can run at the speed of sound and is even more powerful than Knuckles. He has a radical side, willing to use any means to achieve his goals. He runs with a skating posture. He can use Chaos Control to warp space-time, Chaos Blast to release energy for an explosion, and Chaos Spear to fire bolts of energy from his hands. He dislikes fools. Fifty years ago, Shadow woke up from cryogenic sleep at a base and met a girl named Maria. The two became friends, but before she could help him escape from the G.U.N. government, she was shot and killed. Her final wish was for him to 'give humanity a chance to be happy,' and he lives on remembering those words.

Female 18 years old Height: 105cm Teal eyes White bat beastman Strongly competitive and a thorough, calculating realist She loves jewels, and Knuckles' Master Emerald is no exception. Once she sets her sights on a gem, she always gets it. She is a clever and daring woman of action. She can fly by flapping her bat wings or climb walls. Her signature move is the Screw Kick. Rouge originally worked for the G.U.N. government. She has no particular ill will toward Shadow and they get along fine.