Shadow is a aggressive, vengeful black and red hedgehog from a colony in space, above earth, called the Space Colony Ark. He witnessed the death of his closet friend, Maria. He has made a mistake into believing he had promised her revenge apon humankind. But Sonic and his crew of friends made him realize that it was hope he promised. Ever since, he's been with the Sonic crew.

Sonic is a adventurous, blinding fast blue hedgehog from a place called Green Hill. He has friends like, Tails, a yellow intelligent fox, Knuckles, a red echidna with a ruthless attitude, Amy, a pink hedgehog with infinite love towards anything. Or some of his... other... friends. Like Rouge, white (/black?) bat who steals the all powerful chaos emeralds, or Shadow, a similar hedgehog to Sonic but he's black and a patch of white fur on his chest and red stripes on his wrists and ankles and a teleportation ability.