Complete Monster/Mega Man

""Humans are like pigs, dependent upon the Reploids for their very existence...You do realize, don't you, that if I felt like it, I could wipe all humans out in the blink of an eye? Crea! Prea! Do with this one as you please! I've got some pig squeals to enjoy. The squeals of indolent pigs, wasting their pitiful lives on idle pursuits." — Dr. Weil, Mega Man Zero" Mega Man has faced a lot of evil Killer Robots and Mad Scientists in his games, but some of them are so despicable and nasty that even Dr. Wily himself would be repulsed by how depraved they are.

Mega Man Zero/Mega Man ZX

 * Dr. Weil from Mega Man Zero has the dubious honor of being the biggest Complete Monster in the entire series. Not even Wily, Sigma, or even Regal (a fellow Complete Monster himself) can match him in sheer malevolence, insanity, and depravity.
 * Here's the lowdown in case you have to ask why he's here instead of any of those three. First, between the Maverick Wars and the Arcadia Wars, there was an incident known as the Elf Wars, triggered by Dr. Weil corrupting the Mother Elf - a sentient superprogram made to eradicate Wily's Maverick/Zero Virus - and making her into the Dark Elf and using her, along with smaller copies known as Baby Elves and a reprogrammed Zero's body, now christened Omega, to elevate him to a position of absolute power in a campaign of mass terror. Why? Because he thinks that humans are superior than Reploids (and, according to his claim, he's grown tired with all of the Maverick Wars). And that's after the real solution of peace had been found and successfully used - the Mother Elf itself.
 * By the time the Elf Wars ended, 60% of all humans and 90% of all Reploids alive before the war were wiped out, the Dark Elf had been entombed with either a massive cipher device or X's body, and Weil was given an undying mechanical body before being jettisoned off into space so he could watch the world prosper without him. This is just the beginning and take note that HE STARTED EVERYTHING.
 * One hundred years later, he drops down with Omega back online and has managed to construct a replica of X - unlike the Continuity Snarl of the first game, this one is clearly a copy - and wormed his way into supreme power that way, going so far as to have the Four Guardians dismissed. Then, he drops a high-yield bomb in a human settlement with Omega, Crea, and Prea on board, just to get his hands on the Dark Elf again! When Zero comes along to disable Copy X, he kills himself in a One-Winged Angel attempt, thus putting Weil at the top of the food chain as he planned all along. The Resistance later avoids a mass brainwashing attempt by Weil using the Dark Elf's power, though at X's ultimate expense, long enough for Zero to shut down Omega and purify the Dark Elf completely.
 * Even with Omega dead, Weil still rules Neo Arcadia, and his iron- and spike-fisted rule is so brutal that humans are risking going into the wastes of the outside world just to get away from him. Why does he do that? He thinks both humans and Reploids must pay for the crimes they committed against him, even if it's blatantly obvious that he is the one at fault! A caravan of such refugees, led by Neige, finds Area Zero - the site of the Eurasia colony crash - and begins setting that up as their "home away from home", only for Weil to send troops along to start to interfere with the region's recovery as a diversion while he gets Ragnarok up and running. When Craft heel-faces, blows up Neo Arcadia, and then wrecks Ragnarok's cannon controls, Weil tries to drop it on Area Zero as a last resort to kill the whole region, if not the whole planet. Zero manages to stop this completely, though, unlike in the X series, this really was his last hurrah.
 * At the end of the day though...it comes down to this; although he ultimately failed and they won...Weil killed both X and Zero in a way. And he did all that because he thinks if anyone doesn't follow him, they deserve to die. Compare with Wily, who just wants to Take Over the World and stops there (Weil takes over the world...and make the people suffer even more!), Sigma who actually started out as a clean-cut, respected Hero, but fell victim to The Corruption, but still at first tried to do everything for the Reploid's welfare (Weil exhibits a very severe case of It's All About Me and cares NOTHING about humans and Reploids all the same). If that's not a reason by itself for a character to be a Complete Monster, I don't know what is.
 * Keep in mind that Weil existed for only two games, although you can make it four if you count the ZX series, and the rest of his atrocities are only revealed All There in the Manual. And yet, it's through those two games that he quickly gets through to the top of the Sorting Algorithm of Evil, beating Wily and Sigma so easily, all because his acts during the games are horrific enough; mere mention of All There in the Manual takes his monstrosity to the extremes. His actions and war were SO horrific that Neo Arcadia actually hid that part of history, going so far as to flood libraries and declaring anyone who found out a maverick, just so nobody could repeat "Weil's Sin". There's also the little fact that Capcom tried to humanize Wily and Sigma by uncancelling and (although scrapped) retooling their respective series to directly contrast Weil. That means the developers recognized (in other words, they knew) Weil is the most evil villain in the entire series. Sorting Algorithm of Evil, indeed.
 * Although the Rockman Zero manga was intended to be more jovial compared to the actual Zero games, Dr. Weil's characterization in that manga is just as monsterous. Like in Mega Man Zero 3, he was searching for the Dark Elf. At one point, he also emerges from underneath Lito's house to fight Zero, nearly killing Lito, and thus getting Zero extremely angered. He ultimately gets his Karmic Death when Zero smashes his chemical container, which was supposed to keep Weil alive.
 * It speaks volumes when his dragon (Omega), who has a MONUMENTAL (and by monumnetal, we mean most of humanity) body count worth of people who he has personally killed, isn't considered a Complete Monster. Then again, his crimes simply amount to being a mechanical Khorne Berserker on 'roids. As a matter of fact, the fandom loves Omega in a form of heel hate. Contrast with Weil, who the fans simply hate with the burning passion of a thousand suns.
 * On the subject of Omega, Zero was originally intended by Albert Wily as an Ax Crazy Complete Monster who killed with no remorse and no mercy before the then-Maverick Hunter Sigma knocked him unconscious. Then, during the Elf Wars, Weil transferred his data into the Mega Man Zero copy and, ironically, still turned the original Zero into THE monster Wily exactly wanted to create. In other words, Zero Omega still died a monster in a certain perspective.
 * Weil is even acknowledged as one in-universe: Basically, after Zero stops Pegasolta Eclair's attempts at dumping acid rain on Area Zero, Ciel remarks that she couldn't believe that Weil was even human to begin with.
 * We can sum Weil up in his own words:

"I AM THE DEVIL!"

Mega Man (Classic)

 * While the main series of games seems like the last place a Complete Monster would be found, we still get a surefire example in Ra Moon, the true villain of the spinoff game Super Adventure Rockman. Ra Moon is an ancient alien A.I. that Dr. Wily discovers in an ancient temple deep within South America, and after reviving Wily's robots from the second and third games, offers to shut down earth's technology in order to help the good doctor conquer the earth. However, it's revealed at the game's climax that in reality, Ra Moon was using Dr. Wily the entire time. Ra explains that he came to earth 20,000 years in the past and sought to wipe out humanity as he viewed it to be unsatisfactory. To this end, he corrupted the primal humans by giving them the capacity to hurt and kill, and provided them with the ancient tools and weapons they would need to drive themselves into extinction. However, he grew bored with them and their violent ways and thus chose to sleep, reawakening in the present day to finish what he started by using the electromagnetic field he generated to shut down all of earth's technology which would wipe out all humans and robots alike. Ultimately, his master plan was to replace all of the planet's life with his own machines while he ruled completely unopposed, and managed to kill all of Dr. Wily's beloved robots before everyone's favorite robot boy put an end to his power grab. His brand of villainy shocking even Wily, Ra Moon proved to be the most heinous foe that the original Mega Man ever faced.
 * In the Archie Comics, Ra Moon is a sinister AI who crash-landed on Earth centuries ago with aspirations of control. Manipulating an ancient civilization into worshipping it—and even establishing bloody ritual sacrifice in its name—Ra Moon eventually tires of its slaves and decimates the entire civilization whilst sealing itself underground. Upon returning from dormancy in the present day and being found by Dr. Wily, Ra Moon placidly provides for Wily's conquests before betraying the doctor and revealing its intention to scour the planet of both humans and robots alike, unleashing a global EMP wave and causing worldwide catastrophe. Intending on powering up its wave to boil out the brains of any humans it hasn't already killed, Ra Moon's response to resistance is to turn Wily's own creation against him and order it to start maiming Dr. Wily before murdering him, and brainwashing every Robot Master that stands against it.

Mega Man X

 * While he didn't count in the original series thanks to starting as a Well-Intentioned Extremist and being turned insane by a virus, Sigma is nothing short of repugnant and freely malevolent in the intended series reboot Maverick Hunter X. While he was once a noble high-ranking Maverick Hunter, that all changed when Sigma had a talk with his creator Dr. Cain about Reploid potential, specifically the limitless potential locked away within X. Growing obsessed with unleashing that potential, Sigma begins orchestrating catastrophic events that eventually escalate into a brutal war against humans so Reploids can freely evolve without being held back by them. He starts by hiring criminals to hack into enormous industrial Mechanaloids and cause them to go berserk, endangering countless Reploids and humans before eventually killing his hired men himself in order to cover up his involvement with the hack attacks. He then moves on to slaughter all the Reploid staff at a prison in order to spring the highly dangerous, mentally-unstable Vile free in order to contribute to the chaos. He's then caught at a missile base where he's been causing more Mechanaloid attacks by X and Zero just when he's about to jettison the facility's missiles. Realizing that he's cornered, Sigma grabs Zero and sadistically goads X into firing at him with the intention of getting him to sacrifice his best friend if he wants to kill him, only for X to falter. Sigma then nearly kills Zero and forces X to disarm, before coldly launching all the missiles in the facility at the highly populated Abel City, killing thousands of innocent humans and Reploids alike and fatally wounds X. Shortly after this he kickstarts the game by openly declaring war on humanity with the intention of putting Reploids to the ultimate test, laughing madly at the sight of the bombed-out remains of Abel City standing below him. Unlike the original game where Sigma explicitly cared for his fellow Reploids, in this game he shows no such affection, and moves them around as disposable pawns that he can gleefully sacrifice all so he can satisfy his selfish curiosity as to what Reploids are truly capable of.
 * And in the non-canon Vile Mode, he decides to test Vile's potential by siccing him on his eight top Maverick generals as well as their troops. If it wasn't clear before that he didn't truly care for other Reploids...
 * The fourth Mega Man X game gives us the Maverick known as Magma Dragoon, who is the catalyst of the game's plot despite not getting a lot of screentime. Having been promised a glorious battle against X or Zero (Depends on who you play as) by Sigma, Dragoon infiltrated the military organization known as Repliforce and crashed the floating colony of Sky Lagoon into the city below which kills thousands of innocent people. This also gets Repliforce framed for his crime, which causes General to push for Reploid independence which is interpreted as a coup d'état by the Maverick Hunters, and ends with him and his organization wiped out. And while he apologizes to Zero if Zero kills him, he dies unrepentant if X does it, feeling that ending so many lives and causing so much trouble was worth the fight that he was promised.
 * Among the Rebellion army, a faction of extremists in Command Mission, the Reploid Silver Horn sticks out as a sadist on a perpetual power trip lacking in any of his compatriots' redeeming qualities. Warden of the Tianna POW camp, Silver Horn viciously kills many dissenting Reploids himself during the Rebellion's takeover of Giga City, personally torturing the famed hero Steel Massimo into a limbless, barely-living heap and keeping his mangled body underneath the camp. Forcing the Navigator Reploid Nana into acting as a sysop for the camp under the threat of executing all of the POWs, Silver Horn's response when he's finally confronted is to gleefully reminisce on his torture and eventual murder of Steel Massimo to his successor and revealing his ideals that the weak only exist to serve the strong.

Mega Man Battle Network

 * Dr. Regal debuts in the fourth game as a Card-Carrying Villain with a somewhat nonsensical Xanatos Roulette... but it's in the fifth game that the true depths of his evils are revealed. His organization, Nebula, is devoted to converting the world to evil: causing wars, mayhem, and whatnot just to demonstrate his viewpoint - that Humans Are the Real Monsters and, in fact, they should strive to be as cruel and horrible as possible. He also subjects Lan's father to an horrifying Cold-Blooded Torture and gleefully turns innocent NetNavis such as MegaMan.EXE himself into servants of evil, slowly corrupting the whole Net. And his horrifying endgame is to link everyone's souls to the net with Soulnet and Mind Rape everyone with his Nebula Grey program so they'll go crazy and descend into anarchic chaos. To be fair, the fifth game ends with Regal pulling an Heel Face Turn and becoming a model citizen, which would theoretically take him out of Complete Monster territory...but when you consider that said redemption only happened because he was subject to Laser-Guided Amnesia...yeah.
 * Want to know the reason for his Laser-Guided Amnesia? It's because, disapproved of Regal's actions and took them away as punishment. Yes, that's right. Even , a person notorious for running a cyberterrorist organization as revenge on a scientific rival and nearly destroying the world as a result of using a prototype computer program to the Internet, disapproved of Dr. Regal's actions and made sure he paid for it dearly. If even someone like him disapproved of his actions, Regal sat quite nicely in that trope.
 * While Regal was more of a standard moustache-twirling villain during his debut in the fourth game, his plan there was no-less monstrous: he deliberately attracted the attention of an alien program named Duo using Dark Chips, and the evil energy from the chips caused Duo to think that Earth was unfit to prosper due to its conceived corrupt and vile nature, and attempted to wipe it out with his meteorite. While Regal intended to stop Duo, he just wanted to be hailed as a hero for it and went as far as to sabotage far-safer methods in order to do so, not caring that he'd put the entire planet's population in danger of extinction to do so. And at the game's climax he makes a direct attempt on Kid Hero Lan's life by trying to drop him to his death. What a dick.
 * Dr. Regal's hardly the only Complete Monster in Nebula's ranks. Enter ShadeMan.EXE, a ruthless vampiric Net Navi who loves nothing more than committing all sorts of nasty crimes, with cannibalism being his favorite. He's first encountered during the fourth game where he goes on a killing spree through the Net by sucking the life out of tons of innocent Net Navis and feasting on their energy. When he's cornered by MegaMan, he takes a special interest in his friend Roll who he kidnaps and plans on saving for dessert. He flees to the computer network of a radio tower and bombards passerby with sonic frequencies that cause painful headaches to any who hear them. When MegaMan arrives to stop his fun, ShadeMan begins torturing him with high-pitched sound waves, putting him in agonizing pain until his operator Lan Hikari can shut off the speakers the sound waves are pulsing from. He reappears later on, desperate to take back a Dark Chip that they managed to find. In pursuit of the Dark Chip, he sends a Nebula goon and his Navi after Lan and MegaMan only for them to fail, which ticks ShadeMan off to the point that he flat out murders the both of them. He then decides to personally draw the heroes out by causing the robotic mascots at a theme park to go berserk and attack innocent people. Out of all of Nebula's agents, ShadeMan is by far the nastiest one due to being a gleefully violent psycho who is only second to Regal in terms of depravity.

Mega Man Star Force

 * Hailing from the first game is Gemini, the cold-blooded, manipulative right hand man to King Cepheus of Planet FM. It's established right from the start that he's a nasty piece of work: his first scene has him kill his ally Ophiuca for absolutely no reason when he could have easily helped her finish Mega Man off. He goes on to manipulate, a mentally unstable boy with multiple-personality disorder, and uses him as a physical vessel to wreak havoc on Earth in by sending out waves that turn normally friendly humans into hostile, violent assholes who attack their closest friends without a second thought. And during the beginning of the game's final act, he gleefully tortures a depowered Geo Stelar with electricity while making it perfectly clear that this is exactly what his idea of fun is. While all of these acts are thoroughly unpleasant however, they pale to his biggest evil deed of the bunch: Quite tellingly, not even his own allies are too fond of him: seeing him as an overly-violent idiot who brought his death upon himself and not mouring him at all.
 * Joker from the third game coldheartedly kills Luna (a preteen, mind you) and laughs about it, calling her "a stain upon the Earth" for being without powers which even horrifies his own allies. He also tries to make his old ally Ace go Crush! Kill! Destroy! later on.
 * Mr. King is even worse. First of all, he's Joker's operator, so all of Joker's actions can ultimately be traced back to King. Second of all, he is willing to use and manipulate anyone for his own good. In addition to forcing his own Wizard to self-destruct to defeat his enemies, he adopted orphans and forced them to undertake suicidal missions in order to further his own plans. In fact, it is said that Jack and Tia were the only orphans to survive these missions. He then proceeded to take control of Meteor G so he could take over the world by force, raining down deadly Noise upon those who would not subjugate themselves to him. However, after being betrayed by his subordinates, King is supposedly destroyed, but actually becomes an Energy Being and decides to wipe out the world using Meteor G because he figures that if he can't rule the world, he will destroy it. Actually fighting him head on is quite satisfying (every other Big Bad thus far in both the Battle Network and Star Force series has been The Unfought).
 * Sirius from the third game's postgame is a horrifically selfish energy being with the mind and attitude of a crazed child who can be described as being Capcom's answer to Brainiac. Sirius controls a massive black hole that sucks up stars and planets which he adds to an ever-growing collection, and at the start of the postgame has already annihilated the struggling, rebuilding Planet AM while he currently has his sights set on Planet FM. When Mega Man confronts him, he takes a liking to the hero, and makes it clear that he wishes to put him in his collection and strip him of his free will, which he would follow up with by turning him into a mindless pawn that he'll use to battle other EM beings for his entertainment. And when he's destroyed, he refuses to back down and sends his remaining energy to power up Meteor G out of spite, making it easier for the deadly asteroid to wipe out Earth. Even to the end, Sirius views himself as being above all life in the galaxy, which he views as being merely toys for him to play with.

Mega Man Animation

 * While he's a pretty standard villain in his home games, the Ruby Spears cartoon adaptation of the Classic series gives us a nastier incarnation of Dr. Albert Wily. He's attempted to send the moon out of its orbit to kill off most of humanity, forcing the survivors (if there were any) to consider him king, just so he could prove he was better than Dr. Light. This alone doesn't qualify Dr. Wily: he's also tried to use earthquakes to destroy cities, threatening to annihilate them if they don't obey, and he's tortured Mega Man mentally twice in the show. He first did it by making him wonder if he's just a mistake of Dr. Light's, then he does it the second time by ordering Proto Man to act as a Heel Face Mole by earning his brother's trust before turning on him and killing him. It should be noted that Proto Man considers this act to be pretty screwed up.
 * It is difficult to be both a Knight Templar and a Complete Monster, but anime-only character Slur, The Dragon to Big Bad Duo, delivers. Apart from being an absolutely broken Villain Sue, Slur is also fanatically devoted to exterminating all evil from the universe...where by "evil", she means everyone who doesn't agree with her master's extremely draconian concept of morality. In other words, Slur wants to kill all humans just because she doesn't like us. And unlike Duo, Slur has no sense of fair play - she deliberately "sabotages" the Humanity on Trial plot of Stream by giving Asteroid Navis to evil people, so that Duo will be convinced that Earth doesn't deserve to live. Vicious, sadistic, and with no redeeming qualities at all, Slur might very well be the vilest villainess in the franchise, which makes it VERY satisfying
 * The version of Dr. Regal in the Battle Network Anime is once again the head of the evil organization Nebula and serves as the Big Bad of the Axess season. A proud, villainous man selected by the godlike NetNavi Duo as a probe for human life, Regal sees himself as above humanity and schemes for the end of the world. Regal empowers the Darkloid NetNavis on their destructive campaigns through the Dark Chips, while slowly corrupting and driving all of them to insanity and degeneration through them and turning them against their leader ShadeMan.EXE, whom he later brutally kills. Regal forces his fellow Duo-selected probe, Ms. Yuri, to murder her own sister in order to prove her loyalty, and, in the climax of Axess, enshrouds the entire world in a dimensional area powered by the souls of tens of thousands of agonized NetNavis, using his new power to annihilate entire populated cities across the globe while proclaiming himself the herald of humanity's destruction. Later returning as a digital entity in the following season's movie, Regal attempts to destroy the entire world yet again by using Wily's Spectrum program to digitize the planet while subjecting Lan's father to horrible Cold-Blooded Torture, and tries one last time to destroy the world in Stream while betraying Duo and proclaiming himself a god. As always, Dr. Regal is a monstrous man utterly in love with his own evil who sees it as his right to annihilate millions for nothing more than the sake of his own power and ego.
 * The obscenely sadistic MegaMan DS is a Darkloid born from the original MegaMan's feelings of hate and anger, and proves to be among his most threatening foes. Obsessed with wanting to fuse with the powerful Navi Bass, DS seeks to make MegaMan hate him with all his heart so he can utilize his hatred as energy needed to make the fusion a success. To do this, DS commits a slew of horrible crimes such as slaughtering two companies of military Net Navis and framing MegaMan for the act; converting his friend GutsMan into a hateful Berserker against his will before forcing him and MegaMan to fight to the death; and trying to have his ally ShadeMan try to murder his human partner Lan in front of him. After gathering enough hate energy, DS fuses with Bass and opens up an enormous dark hole, looking to swallow the Net and its denizens in pure darkness itself. A monstrous psycho with no moral boundaries whatsoever, DS crosses lines even his fellow Darkloids don't and has no problem betraying his own allies, such as provoking MegaMan into killing ShadeMan, and forcibly devouring the essence of his loyal partner LaserMan for a power boost.
 * The Manga version of Lord Wily is far nastier than his video game and anime counterparts. He is the head of the terrorist organization known as World Three, and is the first Big Bad of the series. A bitter, misanthropic old man who believes that humanity is ugly, stupid, and deserving of destruction due to his robotics research being ignored, Wily wishes to bring about the end of Net Society itself. To that end, he oversees a number of terrorist attacks that endanger thousands of innocents, such as having a school set on fire; trying to painfully brainwash children into becoming World Three's slaves; and trying to demolish a Metroline's security network in order to put its passengers at risk. After obtaining the powerful Life Virus, Wily causes an outbreak of chaotic accidents all across Dentech City before hijacking all of the world's military satellites, which he proceeds to use in an attempt to annihilate major cities around the globe with missiles. Lacking the redeeming qualities of his game and anime counterparts, this incarnation of Lord Wily dies hateful and unrepentant, utterly hell-bent on killing millions of innocents over a petty grudge.
 * Just like he is from his home games, Gemini earns his stripes as the nastiest villain in the Mega Man Star Force anime. He's the treacherous, double-crossing right-hand man to King Cepheus of Planet FM, and is assisting him in annihilating Earth only with the intention of turning on him later. After combining his power with a human boy named, he goes on to murder all of his EM Wave alien allies in order to use their energy to power the key to the doomsday device Andromeda, and attempts to use Andromeda to wipe Earth out while he and can abuse it later to their heart's content, never mind that Cepheus already turned good and decided to spare Earth meaning that Gemini's motives for the planet's destruction can be summed up as just because he can.
 * And unlike in the games where he's a fundamentally good person crippled by multiple personality disorder, Gemini's human ally