While Sonic and Shadow have no particular relationship to one another, their roles as high-speed hedgehogs made them natural enemies when they first met. Especially since, in his first appearance, Shadow was ready to bring about the end of humanity.
Shadow's distorted memories of his dear friend Maria Robotnik led him to believe that she wanted revenge on humanity for the incident that claimed her life, though thankfully he remembered the truth at the last minute. Shadow has since mellowed out, and more often than not will willingly cooperate with Sonic in the interest of the greater good.
Shadow's distorted memories of his dear friend Maria Robotnik led him to believe that she wanted revenge on humanity for the incident that claimed her life, though thankfully he remembered the truth at the last minute. Shadow has since mellowed out, and more often than not will willingly cooperate with Sonic in the interest of the greater good.