Sonic is the world's fastest supersonic hedgehog! He's basically carefree, but he can't stand evil. He can also be short-tempered, but if there's someone in trouble, it would go against his kind nature not to help them.

Created by Dr. Robotniks Grandfather, Shadow is a hybrid hedgehog. He is able to harness the powers of the chaos emeralds into a special power he calls "Chaos Control". Also known as the ultimate life form.

Built to contest Sonic's super speed and to destroy Sonic once and for all, this metallic feind posed a great threat. He was defeated by Sonic in a race to the death.

Miles is a gentle fox with two tails who happens to love robots. He can fly by making his tails spin like helicopter blades.

Knuckles is a rascal anteater with a heroic heart. He is a little gullible, but possesses such enormous strength that he can crush massive boulders easily.

Metal Knuckles is to Knuckles as Metal Sonic is to Sonic. However, anything Knuckles can do, Metal Knuckles can do better. Its jet-gliding puts Knuckles' gliding to shame, and its "knuckles" can tear any oppenent into shreds. Metal Knuckles has only appeared in Sonic R. No, Sonic Advance doesn't count.

It's unknown of her actual allegiance with any group in particular. She has worked as an undercover agent, and as a bounty hunter for Robotnik.

Amy is a cheerful and peppy hedgehog who has decided she is Sonic's girlfriend. She may be cute, but her Piko Piko Hammer makes her a formidable foe.

Dr. Eggman is a mad scientist who is Sonic's arch-enemy. He has launched a host of evil plots, only to see them foiled by Sonic.

Give Sonic the seven Chaos Emeralds and fifty rings, and you get....

...SUPER SONIC!