Eggman, depending on what suits his own needs. Shadow works together with either Sonic's group or Dr. He has been featured in a variety of media, including his own self-titled game.
He is Sonic's rival and is the antithesis of Sonic himself in all aspects of his life. He resembles Sonic in many ways, such as the ability to travel at incredible speeds. His trademark hover shoes propel him at extreme speeds that rival those of Sonic, and with a Chaos Emerald he has the ability to distort time and space using "Chaos Control." Often referred to as being the "Ultimate Life Form," he is a black and crimson male hedgehog that debuted in Sonic Adventure 2. Shadow is an artificially-created life form.
Shadow the Hedgehog (シャドウ・ザ・ヘッジホッグ Shadou za Hejjihoggu?) is a character from the Sonic the Hedgehog series.