Sigma

Sigma also referred to as Commander Sigma or The Commander is the main antagonist of the Mega Man X series.Created by Dr. Cain Sigma was considered the finest of the Reploids and was the first leader of the Maverick Hunters peacekeeping Reploids who defend humans against their renegade counterparts. Although he was once honorable Sigma unexpectedly goes Maverick in the beginning of Mega Man X and rebels against humankind. He defects to the Mavericks and assumes the role of their leader. Under Sigma039s command the Mavericks grow into a legion dedicated to the extermination of the human race.