Sigma

Sigma (シグマ Shiguma?) , formerly referred to as "Commander Sigma", is the main antagonist of the   Mega Man X series. He serves as the final boss in all X series games except   Mega Man X: Command Mission  (where he makes no appearances) and Mega Man X8  (appearing as the final boss if the game is played on easy, and as the penultimate boss if the game is set to normal or hard difficulty, since   Lumine  is fought on normal or hard).

The first Reploid created by Dr. Cain,[1]  Sigma was considered the finest of the Reploids and was the first leader of the Maverick Hunters; peace-keeping 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 Sigma's command, the Mavericks grow into a legion dedicated to the extermination of the human race. Sigma instigates many of the destructive Maverick Wars, with the Maverick Hunters existing to crush Sigma and his minions.

Although he has been destroyed countless times, Sigma's programming always survives and builds himself a new form, ready to menace the world once again.<sup class="reference" id="cite_ref-1">[2]  It is implied that he grows more insidious and vengeful with each transformation, with each successive plan becoming more and more desperate and aggressive. His primary enemies are X, Zero, and more recently, Axl.

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