He is the fastest blue hedgehog in the world who pursues freedom and peace, fighting against the villain Eggman. He is male. He is 15 years old, 75cm tall, and weighs 25kg. He currently possesses one of the seven Chaos Emeralds. He uses spin attacks by rolling and various other moves. He is kind.

He is a timid but kind and sweet baby fox with two tails. He is 9 years old and 70cm tall. He is Sonic's sidekick and best friend. He is incredibly smart and sometimes flies his personal plane, the "Tornado," or uses his two tails to fly by rotating them. He is male.

He is the guardian of the "Master Emerald," a legendary giant green gem that controls the Chaos Emeralds, and is the last remaining descendant of the Echidna race. He is a red echidna, 83cm tall, and weighs 30kg. He wears knuckles on both hands and is slightly stronger than Sonic, though a bit slower. He is 15 years old. He guards the Master Emerald on Angel Island. He has a cool-headed personality and is male.

She is a bright and energetic pink female hedgehog. She has a crush on Sonic and calls herself Sonic's girlfriend. She is 72cm tall, her weight is a secret, and she is said to be 8 years old. She is very kind and nice, even to Tails who travels with Sonic. She uses a squeaky hammer called the "Piko Piko Hammer" as a weapon.

He is a doctor with an IQ of 300 (though Tails is smarter than him). He is said to be in his 50s, 140cm tall, and weighs 100kg. He has the ambition to turn the world into Eggmanland but is constantly stopped by Sonic, his enemy. He builds robots to face Sonic. He possesses one Chaos Emerald. He fights Sonic while riding his single-seat aircraft, the "Eggmobile." He is male.

He is an armadillo and is as powerful as Knuckles. Unlike Knuckles, he is kind and often looks after his best friend Ray. He is 15 years old, 70cm tall, and weighs 29kg. His strength rivals Knuckles, and his ground pound and punching abilities are very strong. He is male.

He is a yellow flying squirrel. As a flying squirrel, he can fly and glide. He is 9 years old and 70cm tall. He is Mighty's best friend and travels with him. He is kind and sweet. He is male.