Male A hedgehog with blue fur and green eyes. Can run at supersonic speeds. Free-spirited and has a strong sense of justice. Loves chili dogs and running. Dislikes getting into water (swimming) and slow things. Shadow's rival. Cannot swim. Once saved Amy from being kidnapped. Has no interest in romance and is dense, so he doesn't realize Amy and Sally like him.

Female A hedgehog with short pink fur like a bob cut and light green eyes. Sally's rival. They aren't on bad terms; it's just friendly competition to win Sonic's heart. When angry, she pulls out her Piko Piko Hammer from nowhere to threaten others. Has a cheerful and bright personality. Has a crush on Sonic. Loves strawberry shortcake. Self-proclaimed girlfriend of Sonic. Started liking him after he rescued her from a kidnapping.

Male A fox with orange fur and blue eyes. Can fly for a short time by rotating his two tails. Good with machinery and is quite emotional. Has a pure and kind personality. Dislikes thunder and ghosts. Takes good care of Cream.

Female A rabbit with vanilla-colored fur and brown eyes. Polite and full of curiosity. Uses formal speech. Respects Sonic. Dislikes fighting. Has a bit of a spoiled side but is a hard worker who gives her best in everything.

Male An echidna with red fur and purple eyes. Always wears spiked knuckles on his hands. Guardian of the Master Emerald; often bickers with Rouge who tries to steal it, but usually loses the argument. Possesses great strength. Loves grapes. Doesn't like Rouge, but always ends up being played by her.

Female A bat with white fur and green eyes. Can fly. Possesses a strong competitive spirit and a realistic personality. Targets Knuckles' Master Emerald; once she sets her sights on a gem, she gets it no matter what. Good at manipulating Knuckles. Has a sly and mischievous personality. Often teases Knuckles.

Male A hedgehog with black fur and red eyes. The Ultimate Lifeform and Sonic's rival. Cold and prickly personality. Can run at supersonic speeds like Sonic, but is slightly slower than him. Has a radical side, not hesitating to use any means to achieve his goals. Can move as if teleporting using a gem called a 'Chaos Emerald'. The Chaos Emerald is green.

A squirrel with brown fur and blue eyes. Amy's rival. They aren't on bad terms; it's just friendly competition to win Sonic's heart. Likes Sonic. Has a righteous and easygoing personality. Possesses the ability to use shields. Was originally the princess of a kingdom. However, she doesn't like the title of princess. Her kingdom was destroyed, which caused her great sorrow, but she overcame it thanks to Sonic, leading to her crush on him.