Vile was originally an A-Class Maverick Hunter, though during his career he racked up more disciplinary charges for unnecessary force, excessive violence and endangering his teammates than any other Hunter in history. It even reached the point where other Hunters were afraid of being put on a mission with him, due to his recklessness and downright bloodthirsty tactics. When Sigma turned Maverick and took many of the best Hunters with him on his war against humanity, it was no surprise that Vile followed him willingly. Though his favorite tool in battle was Ride Armors, even on his own he was a powerful Hunter. He was thought to have been destroyed by Zero and X during the first Sigma Revolt. Zero sacrificed himself to destroy Vile's Ride Armor, and X defeated him in single combat. Ultimately, both Reploids' remains were recovered from the wreckage of Sigma's base and rebuilt by Maverick agents.