Shadow the Hedgehog

Shadow the Hedgehog is the ultimate life form, created by Professor Gerald Robotnik, the evil Eggman's grandfather. After loosing his only friend, Maria, Shadow vowed vengeance and sought the power of the chaos emeralds to destroy humanity. Luckily, Sonic and his friends intervened and would eventually convince Shadow to turn on Eggman and eventually become something of an anti-hero.