Sigma (Japanese: シグマ, Hepburn: Shiguma) is a fictional character and the main antagonist of the Mega Man X video game series. Created by Dr. Cain, Sigma was considered the finest of the Reploids and was the first leader of the Maverick Hunters, peacekeeping androids who defend humans against their renegade counterparts. Although he was once respectable, Sigma unexpectedly goes berserk during Mega Man X and rebels against humankind after coming into contact with the Maverick Virus. He defects to the Mavericks and assumes the role of their leader. Due to the virus integrated into his circuits, he can survive seemingly anything, and constantly returns to menace the world. Sigma has appeared in almost every Mega Man X video game since his first appearance in the 1993 title Mega Man X. He has received praise from critics and fans for his design and charisma as a villain, though his introduction was noted as marking a darker and more pessimistic theme for Mega Man X compared to other Mega Man sub-series.
Characteristics Sigma appears as a tall, bald humanoid in most of his forms. As the former leader of the Maverick Hunters, Sigma is a capable military leader, rendering him a devious and strategic opponent to his primary enemies, X and Zero. Sigma is a skilled and charismatic manipulator, managing to turn various Reploids, Maverick Hunters, and Mavericks to his side. Although he has been killed countless times, Sigma's programming always survives, either building himself a new form, or is revived by Reploid and Maverick admirers alike; it is implied that he grows more insane with each revival. He is fond of incorporating himself into battlesuits vastly more significant than his "regular" form. He serves as the final boss in all games except Mega Man X: Command Mission and Mega Man X8 (he does not appear in the former and in the latter, Sigma is the penultimate boss).
Appearances
Mega Man X series Before the first Mega Man X game, Sigma was the most advanced Reploid of his time, leading the Maverick Hunters. However, one day, the Maverick Hunters received reports of an overwhelmingly powerful "Red Maverick" that destroyed an entire squadron of Hunters. While investigating, Sigma, along with his unit, tracked it down to an abandoned laboratory and faced the Maverick alone. The Maverick is revealed to be Zero, an evil robot created by Dr. Wily that carried a computer virus called "Maverick Virus". After Sigma defeats Zero, the virus inadvertently transfers into Sigma. While the virus is purged from Zero, turning him benevolent, the virus adapts to Sigma, becoming the Sigma Virus. After gradually succumbing to the virus, he suddenly leads a mass revolt among the Reploids, declaring total war on humans. Many Maverick Hunters follow Sigma out of loyalty, leaving Zero in charge of the organization. X, the last creation of Dr. Light and the base model for every Reploid decides to volunteer and joins Zero. X and Zero battle through the Maverick regime, and it is X who finally destroys Sigma. But though his physical body is scrapped, Sigma's "soul" (the Virus) survives. After the end credits roll, Sigma's face appears on a blue monitor and warns X that he will be back. Sigma returns in each installment of the series in various forms but is defeated by X each time. His final appearance is in Mega Man X8 – although he is finally destroyed for good, the Sigma Virus would remain, prompting the events of the Mega Man Zero series.
Other appearances Sigma appears in the crossover game Marvel vs. Capcom Infinite. In the story mode, he merges with Ultron to become "Ultron Sigma" to convert the inhabitants of both of their worlds into their slaves. Sigma as a playable character is available for purchase as standalone downloadable content or as part of the game's character pass. Sigma makes a minor appearance in the Mega Man (1994) episode "Mega X". Sigma appears in a short unlockable OVA in Mega Man Maverick Hunter X entitled "The Day of Σ". It shows the Maverick Hunters before the events of the first Mega Man X game under Sigma's command, before he ultimately revolts.
Development Mega Man X was originally meant to have a team of three villains, one tall, one short, and one chubby. However, the designs by Keiji Inafune were merged to create a single villain, Sigma. These designs were later reused as the basis for Mega Man X2's X-Hunters. Ever since his creation, Inafune aimed parts of his appearance to hint at a connection with Mega Man villain Dr. Wily. He was created with the idea of being an "absolute evil" type character to fit the dark narrative of the games as Sigma is a villain despite being manufactured to be pure good. Starting with Mega Man X2, Inafune wanted to use a computer virus as a plot device, something he considered a more interesting idea than a tangible villain. This led to the creation of the Sigma Virus seen in Mega Man X3 onwards. Inafune denied multiple claims from his fans that Sigma was based on Sagat from the Street Fighter series and that he is instead an original character. Kaiser Sigma was designed with the idea of being more "messy" than the original design of the character. With the creation of Mega Man X4, Inafune originally avoided featuring Sigma since the story of the such game involved a lack of black and white view of the scenario. Since Sigma received major damage in X5, he was redesigned in X6 to lack his early menace and instead "messy". In Mega Man X8 a new villain named Lumine appears; to contrast his angel-like appearance, Sigma was instead made to look like a demon.
Merchandise A figure of Sigma was released by Tamashii Nations in 2013.
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