A hedgehog who proclaims he is the "ultimate life-form". Shadow is an experiment of Gerald Robotnik, and because of this, he is immortal and never ages. He is usually soft-spoken and reserved, until you anger him. He is seen as a counterpart as Sonic, as he is as fast and powerful as the blue hedgehog, which has created a sort of rivalry between them. Shadow is able to use the power of the Chaos Emeralds with ease.