∑, Sigma.

Sigma has been the more fascinating Villain the franchise has offered yet. His technical aspects and his 'reasons' are something not fully developed upon during game story. So I'd like to do a Sigma character Recap.



Sigma was Cain's most advanced Reploid to date. The only Reploid with such complex circuitry (suggests he took a different approach with the Suffering Circuit and instead compensated with added programs and circuits to attain a similar effect). Afterward, he went on to become the Maverick Hunter Leader.



With what we know, Sigma had a fight with Zero, the Red Maverick. And after getting ruined, he was able to win by a KO blow to Zero's Forehead Crystal. Thus marking the initial sequence of his infection.

This harmed his pride as a General, and altered his perspective.

Later, we know he orchestrated the events of "The Day of ∑".

Damaging large scales of the City, and even launching Missiles into it, to mark his Insurrection. Several months had passed since the Red Maverick Incident, and the Day of ∑. Enough time for the Virus to manifest within Sigma, and hie revelation to become clear for his purpose.

Later, X forced to confront Sigma, after his turn or perspective, his rebellion to Humanity.



X1, marks the death of the Reploid, the Hunter Sigma. The original reploid infected by the Virus. His personality was absorbed into the Virus, allowing it to masquerade as Sigma from then on.



X2, the Sigma Virus is assisted by the Reploid known as Serges. Who is the first of the Wily Reploid Bodies known of (not technically specified, but strongly implied). With the communication of the Virus being part of Wily's consciousness, this would further imply that Sigma and Serges had some form of communication, and thus Serges was the one responsible for constructing Sigma's X2 Body.

Upon the destruction of this Body, the Virus freshly concentrate, further took on Sigma's appearance and began to fight with X. The Virus working off of the Network, ahd yet powerful enough to manifest material together to trigger physical phenomena. This was also effected by Physical attacks, which led to the destruction of that first manifestation of the Virus. X2 was the first development of Sigma's insight to Zero's Past/history, and his true form of a Virus. Of course, being stated at the end of X1.

X3, the Doppler War. After the death of Serges, the Virus was drawn to Doppler, who was the one responsible for founding Doppler City, and for developing an Anti-Virus. Placebo of course. And the Virus manipulated Doppler to build two new bodies for Sigma. By the conclusion, Doppler was encountered, and freed from the Virus control yet still infected. Doppler recoded the placebo Anti-Virus into an acting agent, and this was used as Doppler sacrificed himself willingly to the freed Sigma Virus strand. Doppler dies, and that variant of the Virus is deleted.



Some time has passed since the Doppler incident before the Repliforce Cue. THe Virus having infected a Replifirce agent, and leading to yet another body. Of Repliforce Design. This also was met with his conversation with the General, and forcing the Cue directly. That sparked a conflict that he knew X would get involved with. And thus his Lust for X's destruction was further initiated. This ended with the Final Weapon, Sigma's final Body. being that of Repliforce Orbital Weapon. The destruction of the Weapon sprang the Virus into sub-space. Stagnant.

Taking a second approach to the Final Weapon destruction, with the Virus inhabiting the entire Station, it is possible that the Virus was also within the Shuttle X/Zero used to return to Earth, and thus the Virus consciousness has returned to the Rampant Virus to recover strength.



X5 takes an assault type turn when Sigma masquerading consciousness encounters the full Wily consciousness of the Virus. Leading to an unknown Wily Reploid Body (or possibly Isoc) building the Sigma Head and the Sigma bodies. At this point, Sigma took the initiative, and attacked the hunters directly. After mass concentrate Virus was together, he attacked, unleashed a Strand on Eurasia to cultivate and hired Dynamo for further distraction.

The Colony Crashes, that Virus code mixes with the Virus concentrate on Earth, and forms the Zero Virus. The one closest to what Zero initially had before it was carried to Sigma during their initial conflict.

This ruined much of the Earth, and ultimately destroyed X and Zero.

With that Potency of the Virus, it was capable of manifesting materially, and causing radioactive damage to Biological Components, and damage to Technological Components. This was the most aggressive variant of the Virus.

And led to the destruction of the Sigma Virus Core that was responsible for destroying the Hunters. Thus, the Virus was dead. After spreading and losing such strength, it was ultimately lost after the destruction of the Core.



X6, Gate. The only other un-analyzable Reploid finds Zero's DNA. After study, the DNA signature leads him to the Zero Virus, and ultimately to the Sigma Virus. This en-captivated him and forced his lust. He located remnants of the Virus strand and resurrected the Sigma Virus. As well as design the Nightmare Virus. Which in a sense, behaves like the Sigma Virus, just without a consciousness. A Rampant version to say. Gate infused his Zero based Encoding into himself to alter his DNA into a fighting form. Hence his similarity to Zero. But being the one who resurrected Sigma Virus, the Virus was mostly instinct. Being half conscious, the Virus attacked the recognized enemy as instinct. Only to be defeated. But the body lsted long enough to spread the Virus and cause the 2nd Sigma Virus Outbreak.



X7, Red Alert. Axl. This is sketchy currently. But continuing on...

X8, the re-concentrate Virus, also being specific to Copy Chips. This was the Original Sigma Code that was part of the Chip. But with the image used for the Copy, the Original Data was damaged due to the infection. And a Patch was applied to that data in order to make it usable to Reploids. This was also something the Virus could respond to. Of course, the New Gens were immune, till they had that degree of Sigma within them, which made them lust for the same desires that Sigma did while alive; his revelation.

Later to be shown, the Virus was of course alive, and yet present on the Moon as to initiate his insurrection to leave Earth and live on with others that feel the same. The Reploid 'Golden Age'.

This strand was defeated, and upon the defeat of the initial form (mostly composite of the Virus Core and body remains to grant effect of Material Manipulation.) was backstabbed by Lumine, and was absorbed into Lumine's body. Lumine stepped onto Sigma's remains, and was granted a Power Boost, which led to the Seraphium Form. This very well could have been the secondary form of the Sigma Virus if it hadn't been backstabbed. But thus led to Lumine's lust and ultimate destruction.

This triggers 3 possibilities:

1: The Virus was left on the Moon, stagnant.

2: The Virus was reformed and part of the Gel that sprang from Lumine's body and impacted Axl (Forehead Crystal, the same as Zero to Sigma several years earlier), and thus the Virus lives on in Axl. Awaiting the next opportunity of Action.

3: The Virus would have been able to connect with Lifts between the Moon and the Jakob Project Orbital Elevator Control Shaft. Or would have been able to infect neighboring Satellites. And thus would have the option to Project itself into anything able to receive information from Satellites.

Forcing the hunters to act in an alternative way.



Either way, this triggers the Elpiz Project; Mother Elf.

Zero going into Sealment, and researchers able to study his body, Virus qualities and such. leading them to the Virus foundation. Enough to led them to the Sigma Virus, which they used within the Project. Mother Elf is based of off the Sigma Virus, and in a sense is the Ultimate Rendition of the Virus. Purposed for assisting ability.



Come in Weil, who was a Reploid Scientist who learned of the Mother Elf, studied her and was able to interact with the Virus coding, which he later was able to 'Curse', or simply put, he restrained the curative ability of the Elfn in order to unleash the Virus ability's.



With that Said, Sigma has had a major impact of the Direction of the Reploid Age History. His involvement indirectly triggered the advancement of Reploids and led the World into the Darkest Technological Age it ever saw.