Mega Man X Series - Zero
Secondary protagonist of the Mega Man X series Zero, a high ranking Maverick hunter and X's closest friend. Zero was created by the late Dr. Albert Wily, long term enemy of Dr. Light and the original Mega Man. Originally created to defeat both Mega Man and Bass, Zero was violent and disobedient and thus sealed away. Reactivated in the 21XX, a group of reploids lead by the Maverick hunter leader Sigma battled Zero and defeated him, which lead to his enlistment in the Marverick hunters.