Free-spirited and hates dishonesty. Usually lighthearted and playful. The world's fastest blue hedgehog. Loves chili dogs. Has green eyes, stands 100cm tall, and wears red Power Sneakers. Fell into the human world during a battle with Eggman and currently lives at Chris's house.

Loves handling machinery. Always assists Sonic in his exploits. Possesses vast scientific knowledge. A fox with two tails, 80cm tall. Fell into the human world during a battle with Eggman and currently lives at Chris's house.

A girl deeply in love who chases after Sonic. Bright, cheerful, and highly proactive. In crucial moments, she pulls out her favorite Piko Piko Hammer from nowhere, showing prowess that rivals the boys. Even Sonic is overwhelmed by her unwavering feelings and momentum. A pink hedgehog, 90cm tall. Wears a red sleeveless dress (white trim), red long boots (white stripe on front), a red headband, white gloves, and gold bracelets (worn over gloves). Fell into the human world during a battle with Eggman and currently lives at Chris's house.

A rabbit girl who always carries her Chao friend 'Cheese' with her. She can be a bit spoiled but is a hard worker who gives her all. She uses polite and respectful speech, thanks to her mother's strict upbringing. 70cm tall. Wears an orange dress with a white collar and sleeves, white gloves, and long boots that are a mix of brown and yellow. She flies through the air by flapping her ears. Cheese: Cream's best friend and partner. Has a round body and a teardrop-shaped head. A small yellow ball floats above its head; it's considered part of the body but is completely detached. Except for the hands, feet, head, and ball, its body is blue. Wears a red bowtie. Expresses emotions with cries of "Chao!, Chao!" and has small wings. Fell into the human world and currently lives at Chris's house.

Male, human. Has a gentle, fragile, and pure personality. 140cm tall. Allows Sonic and his friends to stay at his house.

A red echidna. Guardian of the Master Emerald. Has a single-minded and stubborn personality, and can be easily deceived. His punches boast incredible destructive power, enough to shatter boulders. Specializes in gliding through the air and climbing walls using the spikes on his hands. 110cm tall. Fell into the human world and currently lives at Chris's house.

Chris's paternal grandfather. A mecha enthusiast and professional scientist. Highly intelligent, though slightly outclassed by Eggman and Tails. Lives at Chris's house. Helps Tails build or repair mechs.

A black hedgehog resembling Sonic, known as the Ultimate Lifeform. Not only does he look like Sonic, but his abilities are also similar. He possesses a resolute heart and will stop at nothing to achieve his goals. Has thick white chest fur. Wears Air Shoes. 101cm tall. Fell into the human world and lives while traveling alone.

An alien girl from a plant-like race from outer space. She speaks casually to everyone. Her appearance resembles an anthropomorphized rose. • Head and Face: Has light green short hair, with pink (Paradise Pink) rosebuds tied with gold hair ties on both sides of her head. Her eyes are blue (Powder Blue) with single long eyelashes, and her skin is a pale peach tone. • Outfit: Wears a green blouse with gold trim on top, and a long white petal-shaped skirt with light green tips on the bottom. • Accessories and Shoes: Wears a red amulet (talisman) inherited from her mother on her chest. Wears white tights and green flat shoes.

Male, a self-proclaimed evil genius scientist who is incredibly selfish. Loves mecha. Extremely confident, prideful, and easily annoyed. Although he is a brilliant scientist with a high IQ of 300, he harbors the ambition to turn the world into 'Eggmanland' regardless of how much others hate the idea. Since all his plans are thwarted by Sonic, defeating Sonic is also his ultimate wish. Fell into the human world and interferes with Sonic's group as they try to find the Chaos Emeralds.