"For the longest time, fans thought they had the origins of Zero sussed out, along with the truth behind Mega Man X's connection to the original series. But last year saw the Japanese debut of Mega Man Zero: Official Complete Works, an art book with a "definitive" timeline that basically exists to say that everything you know is wrong.
For years, the Mega Man/MMX connection seemed fairly clear-cut: X was a new model robot based on the original Mega Man, and Zero was created by Dr. Wily to destroy everything good in the world. That much is still true, but the common belief was that the Maverick virus was created by Dr. Wily and given to Zero. The prevailing theory: Wily figured that if Mega Man were able to destroy Zero, he'd absorb the virus when he did his usual program-copying. It's very clever! Mega Man's greatest strength would be his downfall.
Surprise: That's not how it was at all. The truth is that the Maverick virus was created by Dr. Light. That's right -- the champion of all that's good in the world was responsible for the greatest evil it ever knew.
Well, not quite. The virus was in fact a subroutine designed for X as part of his moral programming. Called the "suffering circuit," the "virus" was intended to pacify X and make him abhor violence. And it worked just fine for X; the problem was when Dr. Cain created flimsy X knockoffs. Apparently, their cut-rate circuits just weren't up to snuff and had a negative reaction to the suffering circuit's effects, making them unruly and fond of violence. Whoops!
Due to X and Zero's similar designs -- Doctors Wily and Light developed their technology together -- the suffering circuit is actually what helped Zero to reform. Meanwhile, Sigma caught the "virus" from his exposure to X -- not from Zero.
Footnote: Ciel (who created Copy X and restored Zero and passed along the technique for the creation of Biometal to her protégé Prairie) and Weil (the guy behind all the bad stuff that happened in Mega Man Zero and Mega Man ZX) are rumored to be descended from Light and Wily, respectively. Which means that, at some point in his life, Dr. Wily had sex. Yuck."
Source from 1Up
I'd personally like to see this Mega Man Zero: Complete Works timeline.
So, evidently it was Sigma's exposure to X that made him go Maverick, not his original fight with a Maverick Zero.
This is why MHX was released, to clear this up. This is why Sigma provoked X's worrying. To trigger the "suffering circuit" (or virus) to supposably influence Reploids based off of X' design to distinguish all their true power and potential, which is the essence of the virus. Because Dr. Light had set diagnostics tests on X for so long, X alone seemed to be the only one to have any sort of immunity to the negative effects of the suffering circuit. This is why X' true potential is absolute, when compared to other Reploids. A mixture of his strong sense of justice, his sympathy for the weak and innocent, his true emotion, and the negative effects of the suffering circuit taken out of the fraction, is what makes this potential his strength.
During X and Sigma's fight at the missile base in MHX, while Sigma's saber is struck inside of X' torso, X reminisces his days with Dr. Light and realizes of his capabilities, then and there. The thought of all the ones whom suffered to the missile attack because of Sigma was more than enough to set X off and bring out his true strength (for a time).
Now as for Zero, his programming is identical to X. Zero has this suffering circuit within him too, only difference is, Zero didn't have diagnostic tests run on him to insure his and other's safety. Rather than acting as though he were innocent and having second thoughts on fighting, Zero has the reversed effects, making him a killing machine, which is exactly what Dr. Wily had in mind.
Years later, after the fight against Maverick Hunter Sigma and Maverick Zero, his suffering circuit is damaged (often referred to as gem or jewel on his forehead) and then reprogrammed at Cain's Lab to fight for good based off X' (and every Reploid's) designs. In X5, Sigma tries to reawaken Zero to his former self by exposing the whole planet with the virus Sigma had embodied himself.
Anyone else, feel free to leave your comments.
Topic: More Theories on X
The supposed 'New Testament' of the X Series.





