Male 15 years old Height: 100cm Green eyes Blue hedgehog beastman Lighthearted, playful, free-spirited, and possesses a strong sense of justice. He is the hero who thwarts Dr. 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 slowness and dishonesty. His home is South Island. He believes life is a continuous adventure and deeply cherishes 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 through the air for a short time 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, single-minded, and stubborn. Sonic's ally and friendly rival. He has spiked knuckles. He can glide through the air and climb walls. He possesses enough strength to shatter boulders with a single punch. He is the guardian of the Master Emerald. He likes grapes. He can be somewhat gullible. Knuckles is a member of the Echidna tribe. He was born on Angel Island, a floating island in the sky. When a creature made of water called Chaos went on a rampage after the Echidna tribe slaughtered the Chao, the entire tribe was wiped out except for Knuckles. The rampage was stopped by the power of the Master Emerald. Although 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, cheerful, and a mood maker. Passionate, persistent, and a woman of action. She is Sonic's friend and has a one-sided crush on him. It is speculated that she might possess strength equal to Knuckles (???). She carries the Piko Piko Hammer. She loves soft-serve ice cream and strawberry shortcake, but hates losing. She practices tarot card reading. Amy was kidnapped by Eggman in the past, and after Sonic rescued her, she fell in love with him. She doesn't care where Sonic goes. Unlike Amy, who is head over heels for him, Sonic considers her just a friend.

Female 6 years old Height: 60cm Brown eyes Vanilla-colored rabbit beastman Extremely polite, kind, highly curious, and brave. A fragile young child. She has long rabbit ears and can glide by flapping them. 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 respect him deeply. Cream is inseparable best friends with a Chao named Cheese. Cheese says "Chao!" when responding or speaking, and like all Chao, cannot speak other words.

Female 14 years old Height: 95cm Yellow eyes Purple cat beastman Cool and calm, but hides intense emotions within. The princess of her world and the guardian of the Sol Emeralds. She possesses pyrokinesis. She is Silver's partner, 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 Possesses a strong sense of justice and is pure-hearted. He came from his own world to change the future. He is innocent and has a firm resolve to fix the timeline. He possesses psychokinesis. He is Blaze's partner, though they are more like close friends. According to Blaze, Silver can sometimes get excited or giddy like a child.

Male Estimated 50 years old Height: 100cm Red eyes Black hedgehog beastman Cool-headed and anti-heroic. The Ultimate Lifeform, a rival and ally to Sonic who resembles him. Like Sonic, he can run at the speed of sound and is even stronger than Knuckles. He has a radical side, willing to use any means to achieve his goals. He runs with a skating motion. 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, he woke up from cryogenic sleep at a research base and met a girl named Maria. The two became friends, but before she could help him escape from G.U.N. forces, she was shot and killed. Her dying 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 clever, bold, and a woman of action. She can fly by flapping her bat wings and climb walls. Her signature move is the Screw Kick. Rouge originally worked for G.U.N., and she has a functional relationship with Shadow.