Sigma (シグマ Shiguma), formerly referred to as "Commander Sigma", is the primary antagonist of the Mega Man X series. He serves as the final boss in all mainline games in the series except Mega Man X8 where he is the penultimate boss in Normal and Hard mode. Once the noble leader of the Maverick Hunters, Sigma fell into insanity and turned Maverick himself, becoming the leader of all haywire Reploids and waging war on humanity. 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.

Plays like CvS/PoTS; based off his Psycho Sigma appearance in X5 but uses his scythe in X4

Includes a resprited version (Sigma.rar) that contains the following adjustments:

• sprites changed to 1x1 counterparts
• made the basic attack anims smoother
• new icon
• new portrait that actually shows the design of the sprites
• added hurt sounds
• added frames to hurt animations and also fixed them all position wise
• changed some sounds effects
• has a chance to talk while getting up
• taunt adds 100 power every time it's done