This Maverick turned out to be a vicious killing machine that managed to wipe out an entire Hunter unit. One day, the Hunters encountered a red Maverick inside an abandoned factory. Many of the other Hunters believed Sigma to be invincible, but they would be proven wrong in time.

He proved to be an excellent military leader and his combat skills were unmatched. When the Maverick Hunters were established to surpress the increase in Reploid crimes, Sigma was appointed as commander of the organisation.

Timothy Cain, the scientist who had discovered X and built the Reploids based on his design. Sigma was among the first Reploids created by Dr. With each 'death' he has suffered, he has become more and more obsessed with killing X and Zero. Time and again, he has manipulated the Maverick Hunters and their allies in order to further his goals and has almost destroyed the entire planet on more than one occasion. While clearly insane, Sigma sincerely believes that his cause is righteous and is willing to use any means necessary to accomplish his goal of robot supremacy, even reducing the Earth to ashes if it means eliminating humanity. He is a Machiavellian schemer and a Darwinist, believing that humanity is weak and completely inferior to Reploids and as such should be destroyed so that the Reploid race will have the freedom it needs to evolve. Since then, he has proven to be ruthless, power-hungry and manipulative.

Sigma was calm and collected and an honourable leader until he turned Maverick.

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