Dr. Weil

"The desire for power. The joy of making everything work for you. You have no way of experiencing this without a human brain. It's the ultimate joy! No mere Reploid could ever understand!"

- Dr. Weil

Dr. Weil, known as Dr. Vile (Dr.バイル) in Japan, is the primary antagonist of the Mega Man Zero series, as the one responsible for the Elf Wars.

Background
Dr. Weil was a human scientist who participated in the project to design the original Cyber-elf, the Mother Elf. In this project, Dr. Weil was a coworker and rival of the ancestress of the future Resistance leader Ciel, and both of them had significantly different views on how the Maverick Wars should be resolved. Weil made weapons to use against the Mavericks and specialized in Reploid revival, and viewing Zero's body as the ideal weapon to end the wars, used it to develop Omega, while his partner worked on analyzing Zero's cognitive program in hopes of finding a cure for the Maverick Virus.

Although the Mother Elf was completed and was successfully used by X to end the Maverick Wars and eliminate the virus altogether, Dr. Weil was dissatisfied with these results. He believed that the Reploids should pay for the carnage their wars caused and submit to humanity. Dr. Weil proposes Project Elpizo, a plan to combine the Mother Elf with Omega to exert control over all Reploids, putting Weil at odds with X and his ideals of coexistence. As humans were fearful of another lengthy war, many favored the project.

The Elf Wars
To further push his agenda, Weil secretly took control of the Mother Elf and reprogrammed her, transforming her into the Dark Elf and created clones of her called Baby Elves. The Baby Elves were used to control Reploids, forcing them to fight each other in a massive battle.

The conflict spread fear and destruction worldwide, resulting in increased support for Project Elpizo, but X and Zero (whose program was put in a new body) managed to recapture the Dark Elf, and used her power to turn the war in their favor, forcing Dr. Weil to unleash Omega onto the battlefield. Omega, supported by an army of Golems, would slaughter countless numbers of humans and Reploids before finally being defeated by X and Zero, bringing the war to an end.

In the aftermath of the war, Omega was sentenced to exile in Earth's orbit sealed within the Forbidden Ark, while a group of human survivors modified Weil's body into a cyborg contained within a bio-mechanical suit that would prevent him from deterioration and death. His memories were also converted into data, so that he would never forget his crimes, and was then banished into the wastelands he had created, to suffer eternally therein. Having been exiled, Dr. Weil began to plot his revenge on human and Reploid alike.

Mega Man Zero 2
Dr. Weil is first mentioned in the ending sequence as the man who placed a curse on the Mother Elf, thus turning her into the Dark Elf. He can also be heard (but not seen) talking to Omega after the credits.

Mega Man Zero 3
Weil makes his reappearance from his imposed exile at the end of the game's opening stage.

He claims to have repented his ways, and is allowed back into Neo Arcadia. However, he secretly gives the Eight Gentle Judges various "upgrades", that also resulted in his brainwashing them to follow his will, to which Harupia later discovered while he was asking about Fefnir and Leviathan's condition.

Weil resurrects Copy X, who in turn makes Weil the leader of the Neo Arcadian Army. One of Weil's first acts as commander of the army is to dismiss Harupia, Fefnir, and Leviathan from their positions. He leads the search for the Dark Elf and two Baby Elves, and eventually combines Omega with the Dark Elf after launching a missile containing Omega into the human settlement Area Z-3079. Weil eventually kills Copy X with a booby trap in his body that detonates when he attempts to access his Seraph form.

With Copy X dead, Dr. Weil invokes Ordinance #8 and becomes leader of Neo Arcadia by unanimous vote. He then uses Neo Arcadia's resources as he sees fit, to gain control of Reploids through the combined powers of the Dark Elf and Omega, in order to punish the citizens of Neo Arcadia for his banishment.

Though Zero destroys Omega in the end of the game, Weil remains ruler of Neo Arcadia.

Mega Man Zero 4
The fourth game in the series begins with the premise of Weil as absolute ruler of Neo Arcadia. Under his rule, humans and Reploids are equally oppressed, with all those that oppose him labeled as Mavericks. His reign of terror became so unbearable that a group of humans escaped to Area Zero, where the remains of the Mega Man X5 Eurasia space colony not only crashed, but also helped revive vegetation.

Seeing Area Zero as a threat, Weil devises Operation Ragnarok to obliterate it, thus forcing people to live in Neo Arcadia. The plan involved using the Einherjar Eight Warriors to distract the Resistance with half-hearted attempts to destroy the ecology in Area Zero, whilst he completed the Ragnarok satellite and its huge energy cannon. He was prevented from firing it by Craft, who ended up firing it at Dr. Weil himself, destroying Neo Arcadia and killing many civilians. Unfortunately, Dr. Weil survives and teleported to Ragnarok, setting the weapon on a collision course towards Earth in a final attempt to destroy Area Zero. He attributes his survival to his regenerative armor, and explains to Zero how the humans modified his body before his exile. Weil states that it can heal all wounds faster than normal, prevents him from aging, and prevented him from dying. Additionally, to ensure that he would never forget his partially metallic and partially carbonic body.

Weil confronts Zero in combat and even though he had gained considerable power by merging with Ragnarok's core, he is defeated. However, Weil tenaciously returns, fully fusing himself with Ragnarok. Zero decides to destroy the core, destroying Ragnarok, Weil, and (presumably) himself along with it. The two battle again as the satellite re-enters Earth's atmosphere and Weil is destroyed when Zero detonates the core sacrificing himself in the processes. 

Mega Man ZX series
Though Dr. Weil doesn't appear directly in the Mega Man ZX series, it is implied that he returned as the major evil of the series in the form of the Biometal Model W (Model V in the Japanese version). Model W is the original Biometal, formed from the pieces of Ragnarok, which Dr. Weil fused with, that fell to Earth at the end of Mega Man Zero 4. Sometime after the end of Mega Man Zero 4, the original commander of the Guardians (Ciel) analyzed data collected from Model W and learned that Model W has the ability to drive both machines and humans to madness. In response, she built the six Biometals (those used in the game) to stop Model W.

A decade prior to Mega Man ZX, the small fragment that Ciel studied was stolen by Serpent. The power of Model W led Serpent to stage various Maverick out-breaks, and, in turn, form Slither Inc. to stop the Mavericks, which caused many Cyber-elves to be released from the deaths of the victims. These Cyber-elves are then captured and used to "awaken" Model W at the end of the game.

In Aile's story, Prometheus and Pandora, two major antagonists, state that Serpent, the hero, themselves and even Model W are but pawns to "the man who created Model W", Master Albert, who made his appearance in Mega Man ZX Advent as one of the Sage Trinity and the creator of Model W and Model A. Though ZX Advent later implies that it was actually Model W that was controlling everything, and that Albert was no different than Serpent, the hero, Prometheus, and Pandora; that even he himself was a pawn. Albert later manages to have the various Model W's reform and form Ouroborous, the Mega Man King's biometal. Model W, and presumably any remaining trace of Dr. Weil, was presumably destroyed for good after Master Albert's death and Ouroborous' destruction.

Appearance
Dr. Weil's design takes notable traits from his villainous predecessor, Dr. Wily. He appears as an aged man with rough skin, a pointed nose, long gray hair and beard and red eyes. Because of his cyborg status, his default form appears as a floating figure with seemingly no legs; his lower body replaced by an array of black and red arrow-like bands to form a coat of sorts. His head is engulfed in an orange glass shield filled with some sort of bio-liquid, often causing his hair to freely flow upwards.

Personality
Weil generally displays a calm, manipulative nature, but underneath that he's clearly psychotic. By re-building Copy X he gained power in Neo Arcadia, and later set the stage for a battle between Copy X and Zero, which he made sure Zero would win. This shows Weil's intelligent side. Also, when he sent Omega in the missile to intercept the Dark Elf, he counted on the Baby Elves to fight Zero as a distraction for not fighting Omega, meaning he knew Zero would go on the missile. He showed his psychotic side when he commented of how much he enjoyed controlling all Reploids with the Dark Elf. Another symptom of his psychotic persona is that in Weil's desire to destroy Area Zero, he wants to bear witness first-hand to the crashing of Ragnarok into Area Zero by staying on the station during its crash. He firmly thinks that, thanks to his regenerative armor, he can survive the crash, regardless of what happens to his "human side".

He is also shown to be extremely sadistic, as evidenced by his expressing how he enjoyed causing the mayhem of the Elf Wars and his admitting that Neige and everyone else's humiliation, rage, and suffering delights him, and the fact that he desires to rule all of Neo Arcadia with his subjects, Human and Reploid alike, living a living death.

He is also shown to be power-hungry, and feels that ruling over people is the ultimate joy, something that he believes no Reploid could ever experience. He also seems to think that this is exactly what humanity feels, as well.

He also tends to view Reploids as being inferior to Humans, that they should obey them as if they were slaves. The only notable exception to this rule was Omega, where he seemed to hold him in far higher regard than himself. This is evidenced by the fact that when Zero asked Dr. Weil why Omega, who was just revealed to be the original Zero, was serving him, Weil stated that Omega was the god of destruction, and all Weil himself did was enhance his power, hinting that he never really viewed Omega as a servant.

Despite his manipulative nature, Weil's most significant weakness is his knack to underestimate his enemies, especially Zero. He thinks that Zero has no chance of defeating Omega, especially when the latter surfaces in his most powerful form. Also, after Zero defeats Craft for the second time, Weil fired a "warning shot", indicating that Ragnarok was still operational. This alerted the Resistance to the imminent threat of Ragnarok's crashing into Area Zero, and the warning shot was like a challenge to his enemies to try to stop the crash.

Weil shows a constant hatred of Reploids, as well as humans for exiling him. He also seems to harbour some hatred towards idealism in general, due to his saying "Risou Dato... ZAREGETTO DA!!!", which roughly translates to "Ideals and such... ARE UTTER NONSENSE!!!", or "Ideals?! WHAT A LIE!!", before his fight with Zero. Also in his final fight with Zero when performing his diamond projectile attack, what he says can be translated as "How foolish of you".

Rockman Zero (manga)
Dr. Weil made his debut in volume 3 of the manga. He is an aged scientist that prolongs his life with chemicals in his body. Weil is looking for the Dark Elf, and orders Omega and Craft to help him, as well as creating a duplicate of Zero known as Roze. However, both Omega and Roze were defeated, and Craft joined Zero.

In the last chapter, Weil uses Mega Vile (メガバイル) to fight against Zero, a giant mecha that has resistant armor and can fire powerful lasers. During Christmas, Weil emerged from the ground and destroyed Lito's house, apparently killing Lito (it's later shown he wasn't inside). Zero is enraged with the death of his friend and fights against Weil with the help of Craft, Neige and the villagers. In the end, Zero manages to get above Mega Vile and uses his Zero Knuckle on the cockpit while falling, breaking the cockpit and the glass encasing Weil's head, making the chemicals spill out. After the attack, Weil's mecha falls into a pit he created, apparently killing him.

Trivia

 * As much as Dr. Wily is to the original Mega Man, and Sigma to Mega Man X, Dr. Weil could also be perceived as Zero's own personal archenemy.


 * Even though Weil is not featured officially until the third game, he is responsible for many of the events in the first two. His corruption of the Mother Elf led to X's original body being used to seal away the Dark Elf, which in turn led to the creation of Copy X, having serious repercussions in the first two games.


 * As seen in the gallery above, three different designs - young, middle-aged, and elder - were proposed for Weil's character. The final design of Weil was based on the latter character concept. Weil's middle-aged concept was later reused for a character in Mega Man ZX Advent who will allow the character to teleport to the Trinity Building.


 * Canonically, Weil is the only Mega Man villain who has successfully destroyed the world, leaving it in a post-apocalyptic state.


 * Although he has no official connection to Dr. Wily, the two doctors have other similarities besides the structure of their names: they both continued to menace the world long after the demise of their mortal bodies (Dr. Wily during the Mega Man X series with the Maverick Virus, and Dr. Weil before and during the Mega Man Zero series as a cyborg, and during the Mega Man ZX series as the original Biometal, Model W), which makes Dr. Weil the most everlasting antagonist, being "alive" during at least two series, while both Dr. Wily and Sigma just lived on their respective series.


 * Dr. Weil mentions that humans enjoy ultimate power and having everything obey their every command. Sigma mentions a similar description of humanity to General when telling him to get Repliforce to fight against humanity/the Maverick Hunters.


 * Weil is the only human character in the the Mega Man franchise, (except for Super Adventure Rockman) to die on screen. (This is, however, disputable- Weil, while once completely human, is now completely robotic with a human's mind, or at least a cyborg.)


 * On the cover of the U.S. release of Mega Man Zero Collection, Dr. Weil boss symbol was still V like in the Japanese version instead of W like in the U.S. release.


 * Being over 100 years old, he is the second oldest human of the series, the oldest being The Master who was over 3000 years old.


 * He is not related to Vile from the Mega Man X series.


 * Contrary to fan speculation, there is no direct evidence that he is Dr. Wily from earlier games. Keiji Inafune has also denied any relation.


 * It should be noted that "Weil" is technically a correct translation of Bairu, if assumed it follows German phonetics; however, "Vile" is the name acknowledged by official Japanese media, proven by the fact that the boss logo in Mega Man Zero 4, which is no longer an Omega symbol, is the letter V in the Japanese game (it is changed into W in the English releases).
 * some fans speculate that Dr.Cain dissaperance from earlier games was because he was dying and got robotic replacements for parts of his body to sustain his life, however he later contracted the maverick program and went into hidding as the program spread to his organic brain and he became Dr.Weil.