Shadow the Hedgehog

G.U.N. Agent Shadow "The Hedgehog/Ultimate Lifeform" Robotnik is the artificial experiment created by Prof. Gerald Robotnik and Black Doom. He was great friends with Gerald's Granddaughter, Maria, until Maria was killed by the Government and Gerald was executed. He used to swear revenge against G.U.N. for Maria's death after Gerald's Grandson, Dr. Ivo "Eggman" Robotnik, busted him out of Prison Island. This happened when he nearly died from an atmosphere caused by Biolizard/Final Hazard. When trapped to another experimental test tube by Eggman, before Rouge the Bat released him, and broke up the fight between him and E-123 Omega in Sonic Heroes, he was suffering from amneisia and after gaining his memories before defeating Black Doom, Shadow has explained to G.U.N. Commander Abraham Tower that he didn't kill Maria and explained how she really died. And then he became a Gov. Agent in Sonig the Hedgehog 2006. He never even ages.

Abilities
He uses Chaos Control, Chaos Illusion, Chaos Sphere and Chaos Blast