Sigma

"It's not over yet, X! The battle! The angst! The destruction! I will make you understand the true potential of Reploids!"

- Sigma to X

Sigma is the main antagonist of the Mega Man X series. He will appear in the upcoming 101st episode of Death Battle, Ultron VS Sigma, where he will fight against Ultron from Marvel Comics. He will be voiced by SupremeOverlordofIce

History
Created by Dr. Cain, Sigma was considered the finest of the Reploids (having been the first made) and was the first leader of the Maverick Hunters — peace-keeping Reploids who defend humans against their renegade robot counterparts. Although he was once honorable and selfless, Sigma unexpectedly goes Maverick in the beginning of Mega Man X and rebelled against humankind (the reason for this was that he was infected by the Maverick Virus, which he received from Zero). 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.

DBX
Sigma made a small cameo in the Season 2 Premiere of DBX, Iron Man VS Mega Man X, where X destroyed him before the battle started.

Trivia

 * Sigma is the fourth Mega Man character in Death Battle, after Dr. Wily, Mega Man and Zero.
 * He is the second to come from the Mega Man X series, after Zero.
 * Sigma is the ninth non-DC character to fight against a Marvel character, after Lord Raiden, Goliath, Darth Vader, Raiden, Pinkie Pie, Android 18, The Shredder and Lucy.
 * He is also the ninth video game character to fight a comic book character, after Zitz, Kratos, Lord Raiden, Fox McCloud, Raiden, Sweet Tooth, Amy Rose, and Shovel Knight.