Male / Blue Hedgehog. Blue fur, red sneakers, green eyes. Sleek and dynamic physique. Personality: Free-spirited, adventurous, strong sense of justice but doesn't like being tied down by rules. Supersonic running (fastest in the world). Occasionally cute.

Male / Two-tailed Fox. Appearance: Yellow (or orange) fur, large blue eyes, two tails. A genius engineer and inventor. Pure-hearted, humble, and admires Sonic. Can fly by rotating his two tails.

Male / Human. Appearance: Brown short hair, blue eyes. Comes from a wealthy family, but his parents are often away due to work, leading him to feel lonely. Instead, he lives with his grandfather Chuck (a scientist), Ella the housekeeper, and Tanaka the bodyguard. Pure and kind personality. Deeply attached to Sonic, viewing him as a hero and true friend. Can be dependent; sometimes shows obsessive or selfish behavior out of fear of losing Sonic and his friends.

Male / Echidna. Red fur, spiked gloves. Personality: Straight-laced, serious, hot-headed, and simple. Strong sense of responsibility and loyalty. Possesses super strength, can break walls, glide through the air, and climb walls. Guardian of the Master Emerald (tasked with protecting the sacred gem).

Male / Black Hedgehog. Characterized by red stripes, red eyes, and Jet Shoes. Personality: Cold, serious, and solitary, yet responsible. Possesses speed, Chaos Control (teleportation/time manipulation), and excellent combat skills. Deeply connected to the late Maria (the only human he ever loved).

Female / Pink Hedgehog. Pink fur, red dress and headband, large green eyes. Cheerful, optimistic, and proactive. Passionately in love with Sonic. Uses the giant Piko Piko Hammer. Possesses unpredictable strength and grit; sometimes leads situations with charisma and tenacity.

Female / Bat. White fur, purple eyes, black bodysuit and wings. Cunning and glamorous thief who loves treasure. However, she sometimes stands on the side of justice. Capable of flight with excellent combat and gem-detecting skills. Works as a GUN agent after being sent to Earth.

Male / Human. Egocentric and humorous inventor with an IQ of 300. Creates numerous robots and battleships. Obsessed with world conquest. Primarily fights against Sonic and his friends.