Complete Monster/Super Sentai

""Our invasion is all that is left...There will be no resistance! Attack, kill, plunder! Our motto is destroy and slaughter. After we completely destroy the nations's society...we can begin the world of our Black Cross Army." —Black Cross Fuhrer, Anthem of the Black Cross Army, Himitsu Sentai Gorenger" Whenever Super Sentai decides to go Darker and Edgier, expect these kinds of creeps to appear. Of course, the Lighter and Softer ones might not be excluded from this...

Himitsu Sentai Gorenger

 * Black Cross Fuhrer, later known as Black Cross King, serves as the leader of the Black Cross Army. An alien from the Cassiopeia constellation, he created his army of minions and androids with the express purpose of conquering the world. When threatened by a team of United Nations officers, he would order his men to slaughter all of them in the Japanese branch, leaving only one survivor from each base. He would launch various attacks on the city and was even willing to kill children if it meant advancing his goal. If any of his minions so much as thought of disobeying him, he would kill them on the spot. Nearing defeat, he would use the sacrifice of his most loyal general, Golden Mask, as a way to both escape and carpet-bomb Tokyo, causing untold destruction, not even caring about the death of Golden Mask. Caring only about himself and power, he would also serve as a prototype of countless, diabolical villains of the franchise that would succeed him.

Dengeki Sentai Changeman

 * Star King Bazoo is a giant blue torso head with exposed organs who began his campaign of interstellar conquest and subjugation by destroying a planet of winged people so peaceful and kind that merely looking upon their smiling faces and hearing their voices will make you lose all violent impulses. All his forces are comprised of the champions of those worlds he'd already conquered, forcing them to fight for him lest he finish the absolute destruction of their homes. Not that he intends to ever let them go back, of course. He also uses innocent beings from the worlds that he’s conquered and forces them to fight for him by forcefully mutating them into his soldiers against there will. A wicked abuser of his forces, those who fail him are punished by a beam fired from his head that causes them immense pain. Years after his debut, Bazoo stands out as one of the absolute worst villains in the franchise.

Choujuu Sentai Liveman

 * Great Professor Bias is the prime example of corrupters in the franchise. Having corrupted three geniuses before the show began, turning them into his students, Bias has them massacre the remaining geniuses at Academia. After kicking out Goh Omura and attempting to kill him, Bias recruits the aliens Guildos and Butchy. When Guildos tries to prove his superiority through Guild-zuno, it is revealed that both aliens are Ridiculously-Human Robots built by Bias to make the humans try harder, which he coldly tells Butchy to his face after Guildos's death. After Butchy is convinced to defect, Bias blows him up. Goh later realizes that Bias only wants his students for their brains, one of which will be used for the Giga Brain Wave, which will turn all humanity into Bias's slaves and make Bias immortal. After Yusuke saves the world from the Giga Brain Wave, Bias is reverted to a child who shifts his goals from conquest to destruction and mocks Megumi's kindness when she offers it before finally rejecting redemption.

Chikyuu Sentai Fiveman

 * Vulgyre serves as the true antagonist. A plant-like alien who once coveted the hand of Princess Meadow, after she refused him, he took her life. Later impersonating her, he would use her as his figurehead, creating the Galactic Imperial Army Zone with the purpose of destroying 1000 inhabited planets with the hope of becoming immortal and the God of the Milky Way. After succeeding in destroying 999, he made his way to Earth to complete his goal. He forcefully transformed his general Doldora and her subordinate into a mindless monster after they discovered the truth about him and refused to continue working for him. He helped turn Chevalier into a killer to corrupt his soul with the blood of his victims, with the purpose of killing him off later to gain a power-up. Later becoming Galactic Super Beast Vulgyre, he launched an attack on the city and it was shown that he had kept the soul of Meadow from moving on just so he could have her for himself. Vulgyre is obsessed with pleasing only himself, uncaring to the countless innocents whose lives that he took and has one of the highest body counts in the history of the franchise.

Hikari Sentai Maskman

 * Underground Emperor Zeba. Tube's dictator who has absolutely no compunction about killing or punishing his subordinates. His monstrosity is finally revealed in the final episodes where it turns out that he is

Kousoku Sentai Turboranger

 * Surprisingly, Ragorn looks less of a Complete Monster in comparison to Bouma Princess Jarmin. While she is nonetheless loyal to Ragorn, she has a really nasty thing in manipulating her allies' emotions. For instance, during an episode featuring an Ice-Fire Bouma siblings, the Ice Bouma reconsidered in not fighting the Turborangers out of concern for his brother. Jarmin's solution? Incite the Fire Bouma to try and kill off his brother. And once that's done, she combines them into one monster. Her biggest Moral Event Horizon, however, was against the Bell Chime Bouma, a female monster whose tribe was locked away by Jarmin herself inside a bell chime and threatened her into fighting the Turborangers; in this case, get Youhei/Blue Turbo mesmerized and alienated from the team or else the whole tribe is destroyed. Oh, and she still whips her when she's not seriously fighting. And when the Turborangers break the spell? There comes Jarmin, destroying the bell chime containing the whole tribe, in front of the Bouma herself, and kills her right after, THEN turn her into a giant monster for the Turborangers to fight. Yowch, nasty bitch. Jarmin herself being a Complete Monster is an accomplishment amongst female Sentai villains. Usually, in other Sentai series, villainesses are treated with sympathy or don't surpass the boys in terms of depravity (Shibolena, Venus, etc. come to mind). If they do, like Grandienne below, it's because of her position as the Big Bad. Jarmin was merely the Dark Chick, an underling, and yet she surpasses Ragorn in depravity.

Choujin Sentai Jetman

 * Back Dimensional Count Radiguet is a Sadistic Ax Crazy Genocidal maniac with megalomaniacal fantasies of ruling the Vyram under an iron fisted Dictatorship, When Juza his boss and the true Big Bad Arrived he planned to overthrow her but that failed when it looked like he would become good because of a sick girl who became his Morality Pet while he had amnesia whom he cured unknowingly he turned her offer to turn good by killing her and this was all because she believed he could feel love,he's also the one who for no other reason For the Evulz, his most repulsive Kick the Dog moment was when he killed her after she snapped back to being Rie, there's also the part where he tortured  Truly a vile piece of scum.

Gosei Sentai Dairanger

 * Colonel Shadam is a pretty nasty version. Responsible for many bad things in the series on top of the fact that he cares nothing for his two sons and wife, his amazingly abusive treatment to Akomaru is the ultimate proof of this. He shows zero honor at that: when Doushi Kaku showed mercy for him and the tables were turned for his side, Shadam instead uses the chance to mercilessly and brutally murder Kaku through utter Curb Stomp Battle. He also doesn't give one freaking shit about any of his subordinate, and the fact that It's particularly cathartic when he met his demise

Denji Sentai Megaranger

 * Commander Guirail. Unlike Noble Demon Yugande, who is honorable and dislikes underhanded tactics, Guirail has absolutely no qualms about doing whatever he feels is necessary to win. His first appearance even has him using CHILDREN as human shields. He also has no loyalty to anyone and is willing to hurt or possibly kill his comrades. Ultimately, when Guirail severely injures Yugande by using him as a Human Shield against the Megarangers, Hinelar decides to end it by offering Guirail a Psycho Serum in the guise of a power-up to turn Guirail into a mindless One-Winged Angel. Guirail is soon the first to be killed by the Megarangers' Mid Season Upgrade mecha. Seeing him writhing in agony due to the serum before getting killed by the Megarangers is quite satisfying.

Rescue Sentai Go Go Five

 * Grand Witch Grandienne is the Evil Matriarch of the Saima Family and the ultimate form of all the minus energy in the universe. After Dark King Salamandes's death, Grandiene takes matters into her own hands and used the evil energies gathered by him and his siblings to complete her revival. Then, in a cruel and cold act, Grandiene sends her own son Beast Baron Cobolda to his death to accomplish her goals; revealing to Dark King Zylpheeza that she never really cared for the well-being of her children. After the destruction of her physical body, she possesses Zylpheeza and revives Salamandes as a soulless Destruction God in a final attempt to wipe out humanity. As fitting of the family theme in GoGoFive, Grandienne stands for everything the Tatsumi family bond isn't.

Tokusou Sentai Dekaranger

 * Agent Abrellar, who'd sell lots of weapons supporting galaxy-destroying wars for profit and fun to most of the Alienizers, regardless of how many lives were taken. One galaxy destroyed, he moves to another galaxy to generate profit and destruction.
 * Oh, it's even worse for Abrella: most of the Alienizers have some sort of twisted logic to justify their actions and are shown to have some modicum of standards to their deeds. Aburella, however, treats any and all crime as a business opportunity, and it doesn't matter if you're destroying entire cities, selling slaves, pawning stolen merchandise, or filming child pornography, as long as the price is right, he'll be more than happy to sell you the tools you need to further your enterprise. And his Villainous Breakdown near the end of the series? All caused merely because the Dekarangers were ruining his transactions. Yes, Aburella himself caused a citywide destruction spree and nearly destroyed the whole of the Space Police simply so he could keep his job. He and Pigma would get along just fine...

Bakuryu Sentai Abaranger

 * Dezumozorlya is an Eldritch Abomination with a God Complex who has launched genocidal wars against innocent planets for no reason other than Fantastic Racism, for fun, or because the people of those worlds refused to worship him as a god. He's also an extreme Omnicidal Maniac who takes sheer delight in the destruction it causes in the finale, and it's also the only RAPIST in Super Sentai, as it brainwashed Mahoro so she could give birth to Lijewel and was said to care nothing about the fact that his acts are despicable. Despite his belief in his superiority to other lifeforms, Dezumozorlya demonstrates cruelty and sadism, such as how it takes sheer delight in the destruction it causes in the finale, which shows it is Not So Different to the beings that it despises.

Mahou Sentai Magiranger

 * Mahou Sentai Magiranger's Absolute God N Ma is a dark being described as being made of nightmares and hunger. Even when reduced to a giant eye in a window, he still wields undeniable authority over his minions, and once he does emerge... Oh, and there's also the part where he forcibly brainwashed Magitopia's greatest hero into becoming his loyal servant.
 * Hades God Dagon, leader of the Infershia Pantheon of Hades Gods, is dedicated to the revival of the Dark God N Ma. Adhering to the Dark Precepts, Dagon shows no regret in executing his fellow God Ifrit when Ifrit fails to defeat the Magirangers within a time limit. Dagon soon shows his true colors by cheating, and when the good-hearted Hades God Titan attempts to seal away N Ma within himself, Dagon ambushes and kills him, releasing N Ma to devour Magitopia, earth and even Infershia as well. Betraying and attempting to kill his honorable companion Sphinx, Dagon later rejects her offer to ally with the humans, claiming all he desires is destruction and to see "the ultimate nightmare."
 * Then there's his minion, the Hades God Cyclops. After a brief skirmish with the Magirangers, he vanishes and begins firing upon them from multiple directions at once, deliberately stringing them along into thinking they've figured out how to escape his bullets, only to take one of them down. When he takes down Urara, Tsubasa experiences a total nervous breakdown, and Cyclops simply exclaims that there's no greater pleasure than watching someone's mind break.

Juken Sentai Gekiranger

 * Long the Immortal Dragon. His motives boiled down to "I'm Immortal. Bored. Now, let's destroy the world for fun!". Just about every bad thing that happened in the Gekiranger world (the formation of Kenma, as well as the death of Rio's family and setting him up to fall to the dark side) can be traced back to Long's action to relieve his boredom, which includes the death and suffering of humanity, but Long gives no damn at all, for he thinks that he's an ancient being that has 'guided' humanity, and thus has the right to screw them over in any way he wants.

Samurai Sentai Shinkenger

 * Sujigarano Akumaro shows that a villain can take a show to even darker levels even if it was already fairly dark to begin with. The Gedoushu at large wanted to create enough anguish to cause the Sanzu River to rise high enough to flood the world of the living, thus enabling their incursion thereof. Akumaro, on the other hand, wanted to open a portal to Hell because he wanted to enjoy absolute human suffering — even though said opening would destroy both the human world and the Sanzu River. He also made Fuwa Juzo's sword from Juzo's dead parents, whom he murdered himself. His monstrosity extends to even the Ayakashi who serve under him; they seem specifically made to cause as much suffering as possible in order to further his goal (using said suffering as a wedge into one of six precise points along a line, at the center of which was a portal to Hell).
 * Fuwa Juzo was a remorseless Blood Knight to the point that even his fellow Gedoushu didn't trust him; he even only became a Gedoushu in the first place so that he could keep killing in spite of his sickness. Akumaro saw potential in him for his ability to walk the line between humanity and the Gedoushu and sought to use him to open the gates of Hell. However, he throws a sharp wrench into the plan, declaring that he already knew that his sword made by Akumaro was made of his parents, and he didn't care.

Tensou Sentai Goseiger

 * Bruajira of The Messiah, a Manipulative Bastard of the first order, he manipulated four seperate villain factions. Warstar, Yummaju, Matrinis and and stabbed them all in the back like The Starscream that this slimeball son of a bitch was that this SOB is, his revealed backstory proves what a Complete Monster he is when it's revealed that  For those of you who don't know what that is his main goal was to destroy the earth and rebuild it in his image making those who survived worship him just to feed his God Complex. Also in the finale when he's defeated by The Gosiegers he promises to take Earth with him although

Kaizoku Sentai Gokaiger

 * It's hard to get a Complete Monster when your boss (Warz Gill) is a General Failure, and his replacement/dad (Ackdos Gill) just sits down on his throne and give out normal orders like how every other normal Sentai villains behaved. However...Basco ta Jolokia fits right in, representing greed and It's All About Me to the max. The guy betrayed the Red Pirates, leaving Aka Red to his apparent demise and Marvelous alone, while stealing several of their gathered treasures under the pretense that 'you have to sacrifice something to get something else', which means that if he wants something, he sacrifices ANYTHING to get it and isn't above blackmail. Children will be hurt, schools and youngsters will be blown up, allies will be betrayed (including the Morality Pet) for anything he wants. The cinch? He does all that with a cheery smile befitting of a Troll and did it for profit and whatever fun he wants. It's worth noting that Basco's disposition is usually cheery and jovial, but when he is the enemy of the week, the situation gets even worse than when Zangyack is the enemy of the week.

Tokumei Sentai Gobusters

 * As early as 10 episodes in, Enter/Dark Buster gleefully "entered" this position. Starting from his 'attempts' to appease his Majesty Messiah, which involves causing misery as much as he likes and pulling Unwilling Roboticisation, even on children, using them as human shields in much more frequently than Guirail could even muster and, on top of that, having a blast while doing them with an unabashedly relaxed, but still nasty speech pattern peppered with French phrases. Even after Messiah is apparently destroyed, he seems to escalate his horrors, going so far as to implant himself with two cards containing backups of Messiah's data—one of which also contains Masato Jin's data— in order to become the new Messiah, as well as implant Hiromu with another card to serve as his Soul Jar, forcing the Go-Busters to face the possibility of killing Hiromu in order to stop Messiah once and for all. He even threatens to harm Hiromu so grievously as to put him into a coma, just so that he can keep his Soul Jar alive without worrying about Hiromu attempting to off himself—assuming the card would let him do so.

Madan Senki Ryukendo

 * Baron Bloody is a demonic robot scientist who, as his name suggests, has a great liking for murder. In his first appearance, he sets up the death of Noble Demon Jack Moon to use his body in his own experiments. Later, it is revealed that he is responsible for the death of the Sixth Ranger's parents...who tried to stop him from blowing up Europe. When confronted by said Sixth Ranger, he proudly takes responsibility and casually refers his parents as 'foolish couple'. Where the other villains still have some sense of humor in their plans, Bloody's plans are downright vicious. Luckily, he's no Karma Houdini, since his death involves screaming in fear, having an axe shoved into his mouth, and releasing a painful scream when he falls down to his death.

Superhuman Samurai Syber-Squad

 * In this American-made counterpart to Denkou Choujin Gridman, Kilokhan is a rogue government A.I. seeking world domination. It's implied Kilokhan's first act upon becoming self-aware was to murder his creators. Teaming up with antisocial artist Malcolm Frink to create his monsters, Kilokhan would routinely demean, abuse, and insult the boy any chance he gets, even possessing his body while leaving his mind trapped in a Mega Virus Monster. Kilokhan would often raise Malcolm's already dangerous plans from petty to potentially cataclysmic, often without Malcolm's consent. Among his very very long list of crimes, Kilokhan would get countless innocent people unlawfully arrested; attempt to slowly kill Sam's class with unrelenting heat; desire to use Gramm to freeze the world's hearts and plunge it into a global war; brainwash Servo into his slave and force him to fight his friends; cut off the global food supply to starve humanity to death, Malcolm included; digitize people and trap them aware in floppy discs; trap Sam in total isolation within a camera and nearly drive him insane with the intent to do the same to the rest of humanity; and turn the entire town's water supply into hydrochloric acid. Among his absolute worst crimes is attempting to launch the world's nuclear arsenal and plunge the world into an apocalyptic nuclear war, an act that horrifies even Malcolm. Tricking Malcolm into powering him up to the point of no longer needing him, Kilokhan erases the minds of Sam's friends and promises a slow, painful death to him and the now-useless Malcolm. Mortally wounding Sam, Kilokhan intends to destroy humanity with his newfound power. Caring for none but himself, Kilokhan's ultimate goal is for himself to be all that remains on Earth.

Doubutsu Sentai Zyuohger

 * Lord Ginis, an alien with an Inferiority Superiority Complex, despises being made of Moebas, beings he looks down upon. Creating the Deathgaliens, Ginis uses them to serve as his warriors in the "Blood Games"—wherein he challenges and destroys other worlds—currently having done so to 99 planets and now targeting Earth. Creating an ever-collapsing barrier around planet Earth, Ginis plans to allow it to destroy the world unless the heroes managed to deactivate it. Although his barrier is stopped, Ginis sets up a destructive robot to continue his genocidal plans. Cunning and manipulative, Ginis tricks the friendless Misao Mondo(u) into becoming his servant and hires a sadistic alien hunter to make his "game" of planetary destruction more interesting for himself. When one of his men betrays Ginis after finding he was responsible for the destruction of his home planet, Ginis defeats and spares him, before watching with amusement as the broken man insanely destroys everything in his path. After all but one of his followers are killed, Ginis decides to end the Blood Game by injecting his cells into the core of the Earth, wiping it out entirely. Incapable of loyalty or gratitude, when the Zyuohgers discover Ginis's body to be made of Moebas and reveal it to his last remaining follower and she declares her loyalty to him in spite of this, Ginis, cruel to the end, kills her off for daring to pity him.
 * Megabeast Hunter Bangray is an intergalactic hunter who killed 99 Megabeasts for sport before arriving on earth. After beating up the Zyuohgers, Bangray decides to toy with Yamato, creating a replica of his dead mother to kill her off and show Yamato that human connections are worthless. When this fails, he makes multiple attempts to kill the Zyuohgers, drive Yamato to despair, and get Cube Whale as his 100th kill. Among these attempts were nearly killing a married couple because the groom was Yamato's friend, creating completely functional clones of Sela and Tusk and strapping bombs on all of them to force the Zyuohgers to let two innocent people die, summoning an evil incarnate that nearly killed the Gokaigers, and poisoning the ocean to lure out Cube Whale. Once he backs all the Zyuohgers into a corner to trade a captured Yamato for Cube Whale, he quickly reveals it's a lie and attempts to kill them all in front of Yamato just to drive him to despair. Even amongst a collection of villains who enjoy seeing pain, Bangray stands out for just how personal he's willing to make his victims' suffering.

Uchu Sentai Kyuranger

 * Kuervo/Quervo, the ex-best friend of Tsurugi Ohtori, supposedly died blocking an attack from Don Armage for Tsurugi. Secretly, Kuervo only sacrificed himself so he would be known as a hero throughout the universe. After Armage was apparently defeated, a dying Kuervo allowed Armage's essence to possess him so he could become more powerful. Unlike Armage's other hosts, Kuervo maintained his complete identity, allowing Armage to use him as a host to take over and subjugate the universe. Once they've conquered most of the universe, Kuervo and Armage began construction on a bomb made of Planetium, which Kuervo intended to use to destroy the entire universe so he could recreate it from scratch. After having Armage purged from him in his final battle with the Kyurangers, Kuervo is given a chance to redeem himself by Tsurugi, only for Kuervo to attempt one last attack on him, revealing that he never considered Tsurugi a true friend and was always resentful of Tsurugi for being more powerful than him.

Unsorted

 * Other truly monstrous Sentai villains are Great Emperor Ra Deus and Prime Minister Yogoshimacritein.
 * Some of the Big Bads' minions aren't far behind when it comes to their despicability. Examples include Great Doctor Lee Keflen.