Infinite Jackal

Infinite, also known as the "Ultimate Mercenary", is a character that appears in the Sonic the Hedgehog series. He is an anthropomorphic jackal and the former leader of the Jackal Squad mercenary group. Infinite originally targeted Doctor Eggman before joining the Eggman Army, only to fall at the hands of Shadow the Hedgehog while defending one of Eggman's facilities. Ashamed of his failure, Infinite chose to wield the power of the Phantom Ruby not only as a means of becoming stronger, but also to abandon his previous identity. With his newfound power, Infinite aided Eggman in expanding the Eggman Empire to its largest size to date by defeating Sonic the Hedgehog. Near the end of the war with The Resistance, Infinite faced Sonic and The Avatar multiple times, until he was defeated during the decisive battle for the planet and consumed by the Phantom Ruby.