Note: Credit to Mega Man Knowledge Base
Appearance
In his default form, Omega is a large Reploid with a distinct knight-like theme with a long coat. His color scheme predominantly features white with black in the center of the torso and the face of the head. He has long, pale pink hair rising from the top of the helmet that reaches his feet. He has detachable arms, which feature gigantic hands with black spiked wrists and razor sharp claws.
Omega's true form is the original body of Zero. It is the same as the fake body Zero had during the Mega Man Zero series, but with a darker red color scheme. It is unknown if this is an artistic change or if Zero's original body was modified between the Mega Man X and Mega Man Zero series. It should be noted that Zero's long hair does not emerge until immediately prior to Omega fighting Zero at Weil's command, implying that Omega's hair, and by extension, Zero's hair, was retractable.
Personality
Omega is first depicted as a silent, but loyal servant of Dr. Weil. However, as the story progresses, he is revealed as an insane Reploid with a god complex. He is a bloodthirsty tool in Dr. Weil's ambitions and is absolutely obedient to his commands, very similar to what Zero was intended to be for Dr. Wily. After returning to Earth after spending a century of exile in space, he developed a grudge against Zero, because he was defeated by Zero despite the latter no longer being in possession of his original body. Also, Omega's ability to speak was reduced to minimum in his exterior armor; in fact, the only words he ever says in this form are a long, drawn out "Zero" and "Lord Weil". Other than that, he doubtlessly believes in Weil's insane purpose for him, as a "messiah" of the new world order and "God of Destruction".
History
The Elf Wars
After the Maverick Wars had been ended by the powers of the Mother Elf by reverting the viral infection of Reploids caused by the Sigma Virus, Dr. Weil, a weapon researcher and DNA revival specialist who had worked at the same laboratory as the unknown female ancestor of Ciel (who had researched Zero's body) in order to find a way to end the war, felt unsatisfied with the result of the solution. Thinking that it wasn't enough to simply cure the Reploids of the virus while they still posed a threat to society due to their free will, he decided to create his own, radical solution, while making himself ruler of the world in the process. Project Elpizo was the end result: to create a Reploid who would become the perfect ruler, by using the power of the Mother Elf to control all the Reploids in the world, thus preventing them becoming Mavericks in the first place.
However, since the world was at peace at the moment thanks to the Mother Elf, he needed to give the government a reason to sanction Project Elpizo. He secretly stole and took control of the Mother Elf and reprogrammed her into the Dark Elf, whose purpose was to create Maverick outbreaks by brainwashing Reploids. Baby Elves, small copies of the Dark Elf, were mass-produced to cause violent Maverick outbreaks worldwide.
As new Mavericks arose and caused terror and destruction in scales never seen before, the government heeded Dr. Weil's pleas and sanctioned Project Elpis to bring this new and devastating conflict to an end. For the project, he was given Zero's body, which possessed the necessary virus countermeasures for creating the perfect ruler, Omega, the messiah of Dr. Weil.
For Omega to control all Reploids worldwide with the Mother Elf, a massive armor was constructed around Omega for the Mother Elf to fuse with it. In addition the armor also boosted Zero's body to its absolute limits and granted it the ability to regenerate any damage (Due to the limitations of the GBA, it was unable to display Omega's mobility and agility). Along with the armor, Omega received new weapons, suitable for his new size and weight. Unknown to everyone Omega received a new personality, which was absolutely loyal to Dr. Weil's orders. With Omega completed by fusing it with the Dark Elf, the baby elves would be redundant as they were no longer needed. (Though they could be still used as attack dogs if needed.)
In the fourth (and what would be the last) year of the war, Zero, in possession of a new body Ciel's ancestor created for him, would wake up so he could fight alongside X against the new threat. At some point during the conflict, which were now known as the Elf Wars, Zero reclaimed the Dark Elf from the Mavericks and used her to bring the uprisings to an end.
It was then when Weil revealed his true colors and ordered Omega and a group of Mechaniloids, similar to Neo Arcadia's later Golem models, to attack his former allies. However, because Zero reclaimed the Dark Elf in time, Omega was unable to fuse with the Dark Elf. Omega caused so much death and destruction and ended up killing 60% of all humans and 90% of all Reploids. This resulted in him becoming known as the "God of Destruction" during this time period. He was defeated after a hard battle by X and Zero using the Final Strike, with Zero in particular having an epiphany about what his true intentions of his powers actually were, that they were to protect his friends and not for destruction.
In the aftermath of the war, Omega was sentenced to exile in Earth's orbit sealed within the Forbidden Ark by the Eight Gentle Judges (who were actually created by Weil should Project Elpizo's ideas for true peace fail), destined to spend the rest of eternity around the earth. However, things would take a different path...
Mega Man Zero 2
Around the time the renegade Resistance member Elpizo released the Dark Elf, Omega was contacted by Dr. Weil upon this discovery, and informed him that it was time for the latter to take action, implicitly ordering him to crash his spacecraft onto Earth.
Mega Man Zero 3
Two months after the Dark Elf had been released from her seal in Neo Arcadia by Elpizo, strange energy readings similar to that of the Dark Elf were detected by the Resistance in a frozen tundra. A reconnaissance unit, consisting of Zero, Ciel and a few Resistance soldiers was dispatched to analyze the anomaly. Upon arriving at the location, they found a Derelict Spacecraft. The closer they got to the ship, the stronger the readings became and Neo Arcadian troops had already cordoned off the area. When Zero arrived at the ship's entrance, he was intercepted by Sage Harpuia, who merely ordered him to retreat at once as there were things of bigger importance now than dealing with him before disappearing inside the ship. A strange, yet familiar growl reached Zero's ears from the inside, seemingly calling for him. Zero fought his way through the hostile forces and entered the core of the ship, where fighting was already in progress. At the core, he saw Fighting Fefnir, Fairy Leviathan, and some Pantheon Hunters battling an enormous Reploid, Omega, but were unable to do so much as damage him, while the Hunters were destroyed during the Messiah's entrance. Weakened and damaged, the two Guardians teleported away, leaving Zero and Omega, whom Zero recognized as the one that called him, all by themselves.
The two battled for awhile, with Zero seemingly immobilizing the giant Reploid, but unable to severally damage it due to its ability to regenerate himself. Even after Harpuia joined the battle as well, he managed to hold his ground. At that moment, Dr. Weil showed up at the scene, halting Omega from continuing battle, as Harpuia was now his comrade as a Neo Arcadian. Upon introducing himself, Copy X appeared as well, having been revived by Weil. Even though Harpuia warned him about all the havoc that Omega and Weil caused in the past, they were pardoned by Copy X and given the permission to enter Neo Arcadia in order to serve Copy X and to regain control over the Dark Elf. All of them (save for Zero) then left to Neo Arcadia. It was later found out that since Omega had returned from outer space, strange green portals had appeared in different locations which seemingly made it possible to travel between the real world and its Cyberspace shadow world.
Back at Neo Arcadia, Harpuia desperately tries to talk Copy X out of trusting Weil, though Copy X claimed his banishment was not a legal one and that, even though his actions caused the most devastating war in history, his banishment was not the verdict of a fair trial. When the Dark Elf was located in Area Z-3079, a residential district with the utmost distance from the Neo Arcadian center, Copy X stripped the remaining three Guardians of their powers and duties and handed all their military command to Weil in order to catch the Dark Elf.
Omega was transported to the missile base near the Aegis Volcano and loaded into a missile which was then fired into the direction of Neo Arcadia to catch the fugitive Cyber-Elf. The Resistance, which intercepted transmissions about the start of the missile, sent Zero into the area to halt the take off of the missile. Though he didn't make it in time to stop the take off, Zero boarded the missile to stop Omega, who was at that time immobilized within.
However, he was intercepted by Crea and Prea, two Baby Elves which managed to hold Zero off Omega long enough for the missile to reach its destination. The missile crashed into the district, killing many innocent people and totally devastating the area. When Zero regained consciousness, the Dark Elf was in front of them, as well as Omega. The giant Reploid had caught her and absorbed her into his body, causing his white and red armor color scheme to turn gold and blue and boosting his abilities to new heights, thus the perfect ruler was finally created. Harpuia, who couldn't watch anymore, turned against Copy X and tried to fight Omega, but he was no match for him. It was only due to the lucky timing of the Resistance's Operators that Zero and Harpuia managed to survive their encounter with the Devil Reploid.
After Zero managed to stop multiple Neo Arcadian attacks aimed at the Resistance base, he went to stop the problem of the cause, which was Copy X. The two of them fought once again, with Zero emerging victorious. When a desperate Copy X called for Weil's and Omega's assistance, the original X revealed that both of them had already disappeared to another location after stealing everything they needed from Neo Arcadia's supplies. When an enraged Copy X tried to transform into his seraph form to destroy Zero once and for all, a self-destruct program within him was triggered, installed into his body by Weil himself, killing him. Shortly afterwards, Weil claimed leadership of Neo Arcadia by, as well as encouraging the citizens of Neo Arcadia to support his cause to terminate the extremists.
Zero was then sent to find out more information about both Omega and his creator. Eventually, he located a sunken data library with information about both of them, as well as their actions during the Elf Wars, despite having to deal with Volteel Biblio. Soon after this, Weil had finished the final modifications on Omega to grant him the power to control every Reploid on the planet. While X defended the inhabitants of the Resistance Base with his powers, Zero (who was unaffected by the Dark Elf's/Omega's powers since his current body possessed the same imperfect virus counter measures of his old body) rushed for Weil's lab.
He managed to defeat Weil's servants, the Eight Gentle Judges, as well as Omega in his empowered form. Enraged by his defeat, the giant Reploid released the powers of the Dark Elf within him, transforming him into a larger and mightier form of himself. It resembled a strange fusion of himself, X and Zero, armed with a giant saber and a chargeable buster cannon. However, Zero defeated him again.
Omega's remains and Zero fell down through the floor of Weil's laboratory, only to find themselves right at the place where Zero was found by Ciel. When Zero scanned his surroundings, Weil revealed Omega's secret to him: that Zero was, in reality, nothing more than a clone, while the real Zero is in fact Omega. From the remains of Omega's Fusion body, the Devil Repiold's true form emerged; it was a Reploid looking exactly like Zero, but with the latter's original color scheme, multiple attack patterns and moves that Zero had previously used in the Maverick Wars (which were, for the most part, now forgotten), along with massive upgrades. Yet, after a fierce battle, Omega was defeated.
However, the battle wasn't completely over, as Omega used the Dark Elf within him to heal his wounds. The remaining three of the Four Guardians appeared to assist Zero in defeating Omega. X also appears, telling Zero that Weil was only telling a half-truth: while Omega may be possessing the original body, the "clone" is still the real Zero, since Zero had his original heart and soul. Zero regained his strength to deliver the final blow, destroying Omega for good, resulting in a massive explosion that only Zero himself survived due to the protection of the now cured Mother Elf. The destruction of Omega also caused the dimensional portals to disappear. In the end, Zero was still Zero, whether spending his life in a copy of his original body or not, his heart was still the right one.
Mega Man Zero 4
Although Omega does not appear in the game proper, owing to his destruction at the end of the previous game, he appears during and is alluded to during the beginning narrative. In addition, he makes a brief cameo appearance when Neige explains to the Resistance that Dr. Weil has made life in Neo Arcadia so unbearable that not even humans were willing to stay in the former human utopia, where the still for Weil was taken during Weil's speech to the Resistance upon using the powered-up Omega to control all Reploids across the planet.
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