History Monster / KamenRider

* ''Kamen Rider Heisei Generations FOREVER'' (''[[Series/KamenRiderBuild Build]]''[=/=]''[[Series/KamenRiderZiO Zi-O]]'' crossover): [[BigBad Tid]]/[[Series/KamenRiderKuuga Another Kuuga]] is a [[Characters/KamenRiderZiOTimeJackers Time Jacker]] who attempts to conquer the world by completely eradicating the history of the Heisei Riders, taking the young child Shingo who exists as a singularity point in time–-thus keeping the Kamen Riders existent in the world–-and sealing him away forever to destroy their timelines and render them as [[TheFourthWallWillNotProtectYou nothing more than fiction in his world]]. Attempting to brainwash the heroes and trying to murder Shingo's own brother, Tid eventually raises a tower in the middle of a large city and has monsters wreak wanton havoc all throughout the city, eventually assuming his form as Another Ultimate Kuuga and vaporizing swathes of innocents himself. Tid attempts to [[OmnicidalManiac annihilate everything that lives]] in the throes of his breakdown, declaring he alone "deserves to smile".

* ''Series/KamenRiderDouble'': [[CardCarryingVillain Shinkuro Isaka]]/[[SerialKiller Weather Dopant]] is a depraved fetishist and a self-admitted PsychoForHire defined by his high-functioning psychopathy and insatiable hunger for power. Originally Shroud's first disciple and a StrawNihilist who found meaning in life upon witnessing the Terror Dopant attacking a group of people, Isaka used his Gaia Memory to become a serial murderer before permanently joining The Museum, with Terui's family being among his victims. Protected from the negative effects of repeatedly using a Gaia Memory by his own sick mind and confessing to using his lover as a tool to satisfy his paraphilia and further his plans, Isaka distributes other Gaia Memories and modifies them to kill their users, once intentionally killing a father in front of his daughter to cause her to develop a PTSD, intending on using her fear to become even more powerful and [[TheStarscream kill his superior]] to take the Terror Memory for himself.

* ''Series/KamenRiderV3'': [[InsaneAdmiral Marshal Armor]]/[[BadBoss Destron Rider]] is the fourth and final Destron Commander. When he assumes command of Destron, his first act is to plant evidence against their head scientist, Jōji Yuki, whom he views as a threat, and execute him via acid pit. Knowing the man values his hands for his work, Armor begins the execution by burning one off first. From there, Armor launches a number of deadly schemes, including attempting to cover Tokyo in [[DeadlyGas nerve gas]], kidnapping children for slave labor, and [[WouldHurtAChild unleashing Vampire-Chameleon on more children]] to feed off their blood. When Vampire-Chameleon kills a pair of his own men, Armor coldly remarks that [[LackOfEmpathy if they weren't so weak they wouldn't have died]]. When ordered by the Destron Leader to [[NukeEm launch a nuclear assault on Tokyo]], Armor kidnaps a scientist's family to force him to work on the weapon. When he frees the heroes, Armor has him killed, and hangs his corpse outside the Destron base as a warning to all who would defy him.

* ''Series/KamenRiderAmazon'': [[MultipleHeadCase Ten-Faced Demon Gorgos]] is the leader of Geddon and a brutal sadist with a taste for human blood--[[LifeDrinker which gives him power]]--and giving ironic deaths to [[BadBoss his own men]]. A [[DiscOneFinalBoss subordinate]] to Ruler, Gorgos is [[EstablishingCharacterMoment introduced]] pouring incendiary blood over the Amazon rainforest, burning a tribe alive and wounding [[TheHero Daisuke Yamamoto]]. In his mission to defeat Daisuke and obtain his bracelet, Gorgos punishes those who dare to fail him, through such means as burning; consumption by vampire bats; and exposure to the sun. Gorgos makes sure to ruin Daisuke's life by killing people close to him, and laughing at their deaths. In one occasion, Gorgos discovered that Daisuke was a close friend to a little girl, and he had her father EatenAlive by a giant snake. After kidnapping several students from an elementary school, Gorgos has them [[WouldHurtAChild tied to the ceiling and tortured with hot gas]]. Growing bored of drinking men's blood, Gorgos uses his servants to try and capture young women, and later children, for him to drain their blood. Capturing a human criminal, Gorgos turns him into the Ant Beastman, praising him for his violence even after he had attacked his own allies. Before his ultimate defeat, Gorgos invaded a local university and slaughtered multiple people with acid.

* ''Film/KamenRiderHibikiAndTheSevenSenki'': [[WhiteHairBlackHeart Hitotsumi]]/[[PsychoForHire Kamen Rider Imitation Kabuki]] is an [[ProfessionalKiller assassin]] who specializes in [[HeroKiller killing Oni]]. Under the guise of an innocent-looking teenager, Hitotsumi is introduced while hunting for Oni in Osaka and begins working for a Douji and Hime, happily commenting on how he will fill himself with Oni blood. Scheming with Kabuki to make the Oni kill each other, Hitotsumi devours him alive when he stops him from eating a boy and uses his illusionary abilities to torment the Oni. Disguised as Kabuki, Hitotsumi would later return to exact revenge on the Oni before his death.

** [[MadScientist Professor Ryoma Sengoku]]/[[TheHeavy Kamen Rider Duke]] is a researcher who created most of the Armored Rider gears. Intending to [[AGodAmI become a god]] with the Forbidden Fruit, Ryoma will exploit and backstab anyone to get what he desires and is a DirtyCoward who will use any cheap tactic to win. Damaging Helheim Forest with his experiments, threatening to destroy the world, Ryoma reacts with apathy. Manipulating Mitsuzane Kureshima into almost killing Kouta Kazuraba by promising to save another's life, Ryoma reveals his promise to be a lie before murdering Mitsuzane's LoveInterest in cold blood, taking the Forbidden Fruit which was fused with her heart to obtain its power for himself.

** The Gurongi lord, [[BigBad N-Daguva-Zeba]], is a sadistic BloodKnight and SocialDarwinist who cares nothing for the lives of humans or his own kind. Upon being reawakened, Daguva releases his 200 Gurongi, slaughtering the archaeologists who found them. Restarting a brutal game in which the Gurongi hunt humans, Daguva kills over one hundred of his own kind for being too weak to take part in the killing game. When the titular Kamen Rider defeats one of his henchmen, Daguva ambushes him, mercilessly beating him and incinerating countless innocents before leaving. Continuing his systematic genocide, Daguva attempts to bring about "Ultimate Darkness", turning humans into twisted, vile creatures like himself and even after being fatally wounded by TheHero, dies laughing, hoping the latter will become as evil as himself.

* ''Series/KamenRiderV3'': [[InsaneAdmiral Marshal Armor]]/[[BadBoss Destron Rider]] is the fourth and final Destron Commander. When he assumes command of Destron, his first act is to plant evidence against their head scientist, Jo(u)ji Yuki, whom he views as a threat, and execute him via acid pit. Knowing the man values his hands for his work, Armor begins the execution by burning one off first. From there, Armor launches a number of deadly schemes, including attempting to cover Tokyo in [[DeadlyGas nerve gas]], kidnapping children for slave labor, and [[WouldHurtAChild unleashing Vampire-Chameleon on more children]] to feed off their blood. When Vampire-Chameleon kills a pair of his own men, Armor coldly remarks that [[LackOfEmpathy if they weren't so weak they wouldn't have died]]. When ordered by the Destron Leader to [[NukeEm launch a nuclear assault on Tokyo]], Armor kidnaps a scientist's family to force him to work on the weapon. When he frees the heroes, Armor has him killed, and hangs his corpse outside the Destron base as a warning to all who would defy him.

* [[AxCrazy Takeshi Asakura]]/[[BloodKnight Kamen Rider Ouja]] is the archetypical evil Rider of the Heisei era and a psychopath that is drawn to violence and wishes to perpetuate it. Originally an escaped SerialKiller who joined the [[Series/KamenRiderRyuki Rider Fight]], Asakura murdered his own family at the age of 13 by starting a fire in their home and would rack up the highest body count amongst the Riders. A vicious sadist, he's responsible for breaking the hands of the intended Kamen Rider Raia, Yuichi Saito, and the murder of an innocent woman, who turns out to be Miho Kirishima's sister, thus making getting revenge her reason for becoming Kamen Rider Femme; Asakura would later use a child as monster bait, with him willing to let her be killed to fuel his thrill for carnage. To top it all off, he kills his own estranged brother by feeding the latter to his Contract Monster, Venosnaker. Returning multiple times to torment future Riders, Asakura frequently sides with Shocker as their PsychoSupporter; brought back in 2015 due to re-alterations in time which led to world domination, Asakura quickly became an enforcer for Shocker and tried to crush LaResistance led by [[Series/KamenRiderDrive Shinnosuke Tomari]] and [[Series/KamenRider555 Takumi Inui]], who opposed their regime. Revived in 2017 by Foundation X, Asakura leads the Beast Rider Squad and terrorizes the [[Series/KamenRiderExAid Cyber Rescue team]], beginning his new series of crimes by murdering a police officer and beating Satsuki until both of her arms were broken. Confronted by Emu Hojo, Asakura pushes his head into a bucket of glass and uses two of his comrades as shields during his battle against Hiiro Kagami, killing them. Asakura's evil is so great that it lives on in the franchise, with Asakura acting as a FountainOfExpies for numerous other villains.

** [[SpoiledBrat Jun Shibaura]]/[[ManipulativeBastard Kamen Rider Gai]] is a rich, Machiavellian college student and a PsychopathicManchild who sees people's lives as tools to satisfy him. Recreating the Rider Fight in the form of a computer game that would send subliminal messages to players, Shibaura convinced his own colleagues to participate, always [[SnuffFilm recording the loser getting brutally killed]] in the process. Putting himself in the position of ORE Journal chief editor, Shibaura planned on spreading city-wide violence by sending his program to their subscribers, and threatened to burn Shinji's Dragreder card if he tried to stop him, which would result in him being devoured by his Contract Monster. When Ren is unable to decide if he should kill him or not, Shibaura takes the opportunity to attack him, mocking Ren for not having the courage to kill him, stating that if a person is a Rider, then killing is a must. Meeting with Asakura, Shibaura gives him Zolda's true identity, [[UngratefulBastard despite the fact]] that he was the one who released him from jail, and gleefully watches Asakura holding a group of people hostage. In his last act of malice, Shibaura kidnapped Yui to reunite the Riders in order to make a "Rider Party" where he could see them fighting each other in his own definition of the ultimate game.

[[AC:Franchise-Wide]]

[[AC:Showa Series]]

[[AC:Heisei Phase 1 Series]]

** [[SpoiledBrat Jun Shibaura]]/[[InsufferableGenius Kamen Rider Gai]] is a rich, Machiavellian college student and a PsychopathicManchild who sees people's lives as tools to satisfy him. Recreating the Rider Fight in the form of a computer game that would send subliminal messages to players, Shibaura convinced his own colleagues to participate, always [[SnuffFilm recording the loser getting brutally killed]] in the process. Putting himself in the position of ORE Journal chief editor, Shibaura planned on spreading city-wide violence by sending his program to their subscribers, and threatened to burn Shinji's Dragreder card if he tried to stop him, which would result in him being devoured by his Contract Monster. When Ren is unable to decide if he should kill him or not, Shibaura takes the opportunity to attack him, mocking Ren for not having the courage to kill him, stating that if a person is a Rider, then killing is a must. Meeting with Asakura, Shibaura gives him Zolda's true identity, [[UngratefulBastard despite the fact]] that he was the one who released him from jail, and gleefully watches Asakura holding a group of people hostage. In his last act of malice, Shibaura kidnapped Yui to reunite the Riders in order to make a "Rider Party" where he could see them fighting each other in his own definition of the ultimate game.

** [[FourEyesZeroSoul Masato Mishima]], the second-in-command of ZECT, is, due to his selfish behavior, their TokenEvilTeammate. In the past, Mishima captured the young boy that would become Dark Kabuto and [[PlayingWithSyringes performed horrendous experiments on him]] to unlock the power of the Hyper Zecter, keeping him as a prisoner for years inside a ZECT facility in Area X. Assigned to oversee the development of the Gatack Zecter, Mishima wastes no time in sacrificing the lives of his own soldiers to see who is worthy of its power. Mishima allies himself with the Worms to stop the independent non-ZECT Riders, framing Daisuke for the murder of a rival makeup artist and later sending an agent whom he forced to eat nothing but dry boiled rice for the last seven years of her life to pose as a cadet to get closer to Tendou in a plot to assassinate him. Participating in the AM Bomb operation, Mishima is disappointed in his superior for attempting to save the civilians that were made hostage by the Worms in Area C3, informing Arata that if he fails the negotiation, he'll just nuke the entire district. After the existence of Worms is announced to the world, Mishima turns himself into a Native and conspires to do the same with the rest of the world by usurping the position of general and, just so he doesn't get to lose his status after all the Worms have been exterminated, manipulating the population into wearing a pendant that detects Worms, but, unbeknownst to them, also converts those wearing it into Natives.

[[AC:Heisei Phase 2 Series]]

** [[WickedCultured 010 Paint Roidmude]] is a MadArtist whose sadism disturbs even other Roidmudes. During the Global Freeze, Paint personally attacked Kiriko, turning her arm into data until she was saved by Proto-Drive, an event which traumatized her. Six months later, Paint assumed the identity of a gallery owner who he had placed in a painting, and with the assistance of his apprentice, did the same thing to several women who wandered near the gallery, all while they were [[AndIMustScream aware of their situation but unable to escape]]. Realizing that Kiriko is investigating the serial kidnappings, Paint triggered her post-traumatic stress by attacking her once again. Using Mashin Chaser as a distraction, Paint planned on fleeing to another area so he could find a new hunting ground, but not before he tried to trap Kiriko in a painting, seeking to [[LovesTheSoundOfScreaming immortalize her expression of pure and sheer terror]].

** [[OmnicidalManiac Evolto]]/[[SatanicArchetype Kamen Rider Evol]], [[BigBad the true mastermind]] behind the problems faced by the heroes, is an entity seeking to create a "new world" by [[PlanetEater devouring everything in the universe]], leaving only himself. Destroying planets alongside his people, the [[PlanetLooters Blood Tribe]], Evolto wiped out many civilizations before being stopped on Mars by the surviving Martian Queen Vernage. Possessing an astronaut and rendering him [[AndIMustScream aware but unable to do anything]], Evolto goes to the Earth and causes the Skywall Disaster that killed countless innocents and split Japan into three states. Under the alias "Blood Stalk", Evolto corrupts Gentoku Himuro by preying on his mind and killing his best friend and founds [[Characters/KamenRiderBuildFaust Faust]] with him and scientist Takumi Katsuragi to carry out painful experiments on kidnapped people to turn them into [[MonsterOfTheWeek Smash]]. When Katsuragi discovers his alien origins and turns against him, Evolto mind wipes him, kills an innocent man to swap his face with him, and renames him "Sento Kiryu" so he can keep using him. Desiring Ryuga Banjo, whom he corrupted with his DNA when he was only an infant, as his new host, Evolto had Ryuga's fiancée, fatally transformed into a "Smash", to increase Ryuga's raise Hazard Level by increasing his rage. Inciting a war between the three states of Japan, Evolto painfully experiments on Gentoku to turn him into a weapon and takes over Sento's body, keeping his personality around so he can [[ForcedToWatch make him watch]] as he slaughters his friends. He later betrays Namba and challenges the Kamen Riders to a final battle where they will have to reach the top of the Pandora Tower, destroying a section of Japan for every ten minutes they don't make it. Achieving his ultimate form, Evolto summons a Black Hole to consume the Earth but destroys it slowly [[ForTheEvulz so he can gaze at the despair on the heroes' faces for longer]].

[[AC:Spinoffs]]
* ''Series/KamenRiderDragonKnight'': [[InsaneAdmiral General Xaviax]]/[[ManipulativeBastard Kamen Rider Wrath]] is an arrogant alien warlord and the [[BigBad one behind all the tragedies]] throughout the series. Originating from the planet of Karsh, Xaviax devastated his own planet with a long-lasting civil war and decided to enslave civilizations from other planets, starting with Ventara. Having badly injured his former ally Eubulon and vented nine of the original Ventaran riders, Xaviax saw Earth as his next target. Kidnapping humans and leaving them in coma, Xaviax manipulated a group of people into becoming riders, taking advantage of Kit's love for his father, one of his victims. Xaviax's ultimate goal was to not only make humanity his next victim, but to hunt for the Ventaran riders who had escaped from him, especially Len. Succeeding in bringing riders to his side, Xaviax orders his right-hand man to vent the agents who he considers to be a loose canon, and was indifferent to his venting at the hands of a furious Len, possessing the body of a comatose patient to use him as his new puppet. Failing to achieve his goals, Xaviax made a final attempt to manipulate the riders before his death. While seemingly caring for his planet, his [[FauxAffablyEvil superficial charm]], [[LackOfEmpathy extreme methods]] and [[CardCarryingVillain proud towards his own cruelty]] reveal his [[NotSoWellIntentionedExtremist noble intentions as the empty excuses]] of an unfeeling tyrant with a superiority complex and a self-proclaimed evildoer.

** [[CardCarryingVillain Soji Shitashimo]], from season 1's "[[Recap/KamenRiderAmazonsEp7GameOfTheButchers GAME OF THE BUTCHERS]] and "[[Recap/KamenRiderAmazonsEp8HeroOrNot HERO OR NOT]]", proves that [[HumansAreTheRealMonsters humans can be just as monstrous as Amazonz]]. Initially appearing to be a fitness-obsessed jerk, Shitashimo is actually a SerialKiller of women who uses his junkyard as a dumping ground. Upon realizing that he is being suspected for murdering another woman, he tries to kill two agents sent to investigate him, Nozomi and Mamoru, by burning them alive, and when that fails, he decides to torture them instead, binding them with chains and forcing one to watch as he beats the other with a pipe, mocking Mamoru for being an Amazon as he does so and telling him that he can only feel alive when beating something until it is "bloody broken and unable to move". Annoyed by Nozomi's attempts of ordering Mamoru to break the chains, he proceeds to savagely beat her in front of Mamoru with his own fists until her face is a bloodied mess, laughing at her suffering [[PsychopathicManchild like a child playing with a toy]]. His violent behavior serves to hide the fact that he is a DirtyCoward who begs to be spared when confronted in a proper fight. Unlike the Amazonz, Shitashimo is merely a vicious sociopath who enjoys killing innocent women simply because [[ForTheEvulz he can]].
** [[MadDoctor The Elephant Amazon]], from season 2's "[[Recap/KamenRiderAmazonsEp16PersonaNonGrata PERSONA NON GRATA]]" and "[[Recap/KamenRiderAmazonsEp17QuoVadis QUO VADIS?]]", is the most repulsive New-Type to be investigated by the 4C. Using his clinic as a front to find unsuspecting victims, Elephant's method of killing his prey consists of inserting a long proboscis into the victim's ear and [[BrainFood dissolve the brain]] while they are still conscious, having done this to four people in just one week. After drinking the brain of a woman and leaving her to convulse, Elephant killed a random man, before trying to do the same to a woman who found the body, excitingly calling her his next patient. A callous sadist who gladly accepted his nature, Elephant was a reminder that not every Amazon tried to contain the craving for human flesh.

[[AC:Film-Exclusive]]

* ''Film/KamenRider555ParadiseLost'': [[SociopathicSoldier Leo]]/[[PsychoForHire Kamen Rider Psyga]], the Lion Orphnoch from this alternate continuity and its prequel ''Lost World'', is, like his inspiration--the aforementioned Kitazaki--a normally calm yet cruel BloodKnight who is [[TheDreaded feared]] by humans and Orphnoch alike. Leo was given the Psyga Gear after having found an extremely injured Murakami and demanding an Emperor Belt for himself, or else he would leave him to die. Placed under the supervision of Murakami, Leo joined Smart Brain's paramilitary solely to kill humans and have a chance to fight with other Orphnoch, leading the Riotroopers in the genocidal campaign against the human population. [[EstablishingCharacterMoment Introduced]] murdering three members of his own race with no hesitation, Leo participates in attacks against the Human Liberation Army at their sanctuary, personally killing Kusaka and leaving several civilians dead or injured, later taking the opportunity to bomb the place. Shortly after kidnapping Mari, Leo tried to stop Takumi from saving her, intending on having her executed on live television.

* ''Film/KamenRiderKabutoGodSpeedLove'': [[TheSocialDarwinist Issei Kurosaki]]/[[TheBrute Kamen Rider Caucasus]], the BigBad, is ZECT's legendary SociopathicSoldier and an eccentric thug who views strenght as beauty. [[PsychoForHire Hired]] to destroy Neo-ZECT troops, Kurosaki becomes notorious for his enormous body count and habit of leaving roses on his victims' corpses. After executing Neo-ZECT leader Hidenari Oda, Kurosaki participates in a conspiracy with ZECT's inner circle to [[ColonyDrop annihilate humanity with a second meteor]] filled with dormant Worm eggs. When confronted by Tendou as to why he would let the Worms rule earth, Kurosaki confesses to not caring for the lives of both humans and Worms, merely wishing to satisfy his Darwinistic philosophy. Severely injuring renegade ZECT field agent Arata Kagami in a space station, Kurosaki breaks the window of his escape pod out of spite, leaving him to freeze and suffocate to death.

* ''Series/KamenRiderAmazons: The Last Judgement'': [[HalfHumanHybrid Einosuke Mido]]/[[WouldHurtAChild Kamen Rider Amazon Neo Alpha]] is the militant anti-Amazon director of the Amazon Livestock Project and one of the worst examples of a BoomerangBigot in the franchise. As a human-Amazon hybrid working for the pro-human leader of 4C, Mido keeps the original Alpha as his slave and routinely takes his cells to raise herbivore Amazon children, which he brainwashes with the nihilistic philosophy that they are born to serve humans, converting an {{orphanage|Of Fear}} into his own Amazon Farm. When the orphans are ready, Mido sells them to rich humans and they are butchered to be made into exquisite food. After one of his orphans retaliates by killing an important politician who would greenlight his project, Mido is furious to see that such "cattle" could "dare defy noble humans" and rampages through the orphanage and outside, gunning down several orphans in his path while informing them that "cattle don't need dreams".

[[AC:Literature]]

* ''[[Series/KamenRider555 Kamen Rider Faiz]]: Seiden: Grotesque/Deformed Flowers'', by Creator/ToshikiInoue: [[StalkerWithACrush Masato Kusaka]]/[[TheRival Kamen Rider Kaixa]] manages to be [[AdaptationalVillainy much more repugnant and heinous]] than he already was in the show. In the past, Kusaka was one of the "Ryusei Children", orphans raised to be able to successfully wear the drivers. Bullied by his peers, Kusaka had Mari to keep him company, but unbeknownst to her, Kusaka only saw her as a possession, rather than a real friend. When his classmates are attacked by an Orphnoch, Kusaka [[FantasticRacism generalized the entire race]] as being monstrous abominations who deserve to be destroyed by him, even if there are good-hearted Orphnochs. Upon getting hold of the Kaixa Gear, Kusaka took the chance to try and [[FinalSolution kill all Orphnochs]] and keep Mari only to himself. Kusaka was responsible for the murder of Yuka, another bullying victim and a close friend to [[BigBad Kiba]], driving him to hate the human race. Not satisfied with his crimes, Kusaka rapes the underaged Mari, not caring if the assault had left her hopeless and depressed. Kiba is [[RapeIsASpecialKindOfEvil so disgusted]] by this that he personally [[AnArmAndALeg rips off Kusaka's limbs]] as punishment for his crime. Later, Kusaka resurfaced once again to make Mari's life a living hell, but was ultimately stopped and killed by [[TheHero Takumi Inui]]. A calculating, antisocial bigot who saw others as mere objects for him to use in his genocidal quest, Kusaka served as a brutal example of how even the worst kinds of people can become Riders.

[[AC:Manga]]

* ''Manga/KamenRiderKuuga'' [[Manga/KamenRiderKuuga manga]]: [[StarterVillain Akira Harada]] is a psychotic SerialKiller who, upon witnessing the first player of the Gegeru, Zu-Gumun-Ba, the Spider Gurongi, massacring humans on a railway, decided to worship Gumun as his goddess. A registered sex offender, Harada had tried killing himself for his goddess, and when he failed, Harada came up with the idea of "sharing his dream" with other people. Prior to having his identity revealed via DNA analysis, Harada had already murdered four women; by opening their chests, filling them with gunpowder, and burning them alive so they could become "human fireworks". When encountered by the detective investigating his murders, [[FriendOnTheForce Kaoru Ichijo]], Harada had killed another woman, and laughed at her death. Transported to an ambulance after attempting suicide, Harada slits the driver's throat and brags about being able to resume his serial killings. Harada is found by Gumun on the parking lot, and when he sees the remains of the creature's victims, he feels joy, seeing this as his goddess's work. A [[PsychopathicManchild childish maniac]] with an obsession for fireworks, Harada was proof that [[HumansAreTheRealMonsters the Gurongi are not the only beasts]] roaming Tokyo.

[[AC:Other Media]]

* ''Series/KamenRiderBlack'': While Gorgom was a {{Cult}} led by literal monsters, these two [[PsychoSupporter Psycho Supporters]] prove that HumansAreTheRealMonsters.

* ''Series/KamenRider555'': In this {{Cyberpunk}} world that stands as one of the [[DarkerAndEdgier Darkest]] series in the franchise, these select two stand out

* ''Film/KamenRiderAgitoProjectG4'': [[KnightTemplar Captain Risa Fukami]] is a dangerous combination of [[GeneralFailure incompetence]] and [[InsaneAdmiral sociopathy]]. An officer working for the Japanese Ground Self-Defence Forces, Risa was in charge of an educational facility that exploited the abilities of psychic orphans. When the high levels of ESP attracted the attention of the Ant Lords, Risa merely saw the massacre as a failed experiment. Stealing information from the G3 Unit, Risa completes the lethal [[Film/KamenRiderAgitoProjectG4 G4 System]] and equips suicidal volunteers with it until she can find a way for it to be mass-produced, resulting in at least six casualties. After kidnapping Mana Kazaya, Risa connects her to a machine that absorbs her powers and gives them to the G4 System. Realizing that she had brought the Ant Lords to her base to kill even more people, Risa cowardly uses some of her soldiers as [[HumanShield human shields]], willing to sacrifice the lives of others even in the face of death.

''Franchise/KamenRider'' has been [[LongRunner around since 1971]], with its main theme being about how someone can rise above tragedy to become a hero and while many villains have redeeming qualities, these are [[CompleteMonster the very worst]] that have none. While some are genuine monsters, all too often they're [[HumansAreTheRealMonsters all too human]].

[[caption-width-right:350:"Just getting ready to exercise."]]

* ''Series/KamenRiderDenO'': While considerably LighterAndSofter than its predecessors, the show still has these two villains:
** [[PsychoForHire The Wolf Imagin]] is an easily-annoyed, psychotic berserker who ranks amongst the worst in [[BigBad Kai]]'s army. Forging a contract with Yuka Sawada, who wished to have memories of her years in high school, Wolf began vaporizing schoolgirls and giving their possessions to Yuka, all while mocking her for having a boring wish. Going to the past, Wolf wastes no time in causing even more chaos. Frustrated by the lack of orders, Wolf goes on a rampage, collapsing entire buildings and killing countless civilians.

* ''Kamen Rider Den-O: I'm Born!'': [[StrawNihilist Gaoh/Kamen Rider Gaoh]] is a thief-king and [[FallenHero rogue Rider]] who leads a gang of renegade Imagin, wishing nothing more than the [[OmnicidalManiac destruction of time itself]] simply because he grew bored of it. After invading the [=DenLiner=] and taking its passengers as hostages, Gaoh goes back in time and obtains the [=GaohLiner=], destroying an entire village as "practice". Travelling to the day when Ryotaro was born, Gaoh forces him to watch as he erases the city and its people from time, turning the place into a desolated wasteland, planning to repeat this process with the entire world.

* ''Series/KamenRiderAgito'': [[KnightTemplar Captain Risa Fukami]] is a dangerous combination of [[GeneralFailure incompetence]] and [[InsaneAdmiral sociopathy]]. An officer working for the Japanese Ground Self-Defence Forces, Risa was in charge of an educational facility that exploited the abilities of psychic orphans. When the high levels of ESP attracted the attention of the Ant Lords, Risa merely saw the massacre as a failed experiment. Stealing information from the G3 Unit, Risa completes the lethal [[Film/KamenRiderAgitoProjectG4 G4 System]] and equips suicidal volunteers with it until she can find a way for it to be mass-produced, resulting in at least six casualties. After kidnapping Mana Kazaya, Risa connects her to a machine that absorbs her powers and gives them to the G4 System. Realizing that she had brought the Ant Lords to her base to kill even more people, Risa cowardly uses some of her soldiers as [[HumanShield human shields]], willing to sacrifice the lives of others even in the face of death.

** [[StrawNihilist Gaoh/Kamen Rider Gaoh]] is a thief-king and [[FallenHero rogue Rider]] who leads a gang of renegade Imagin, wishing nothing more than the [[OmnicidalManiac destruction of time itself]] simply because he grew bored of it. After invading the [=DenLiner=] and taking its passengers as hostages, Gaoh goes back in time and obtains the [=GaohLiner=], destroying an entire village as "practice". Travelling to the day when Ryotaro was born, Gaoh forces him to watch as he erases the city and its people from time, turning the place into a desolated wasteland, planning to repeat this process with the entire world.

** [[PsychoForHire Kitazaki]]/[[DragonInChief Dragon Orphnoch]] is the youngest and cruelest member of the Lucky Clover. A [[TeensAreMonsters sadistic teenager]] with the power to turn everything he touches into ash, Kitazaki, who lives solely for [[BloodKnight fighting]] and [[SerialKiller killing]], sees the war between humans and Orphnochs as an opportunity to never feel bored again. Shortly before the events of the series, Kitazaki took part in a massacre that left several Ryusei students dead, breaking Mari's neck himself. When in the presence of other Orphnochs, Kitazaki uses his abilities to physically hurt them, such as pressing his fist against their cheeks. Even when not working for Smart Brain, Kitazaki enjoys murdering humans whenever he can, just for fun. After obtaining the Delta Gear, Kitazaki uses it to engage in brutal confrontations with other Riders, and tortures another Lucky Clover agent when he tries to steal it from him. If the mission he is given is not fun enough, Kitazaki creates "games" to challenge the rest of the Lucky Clover, such as promising to slap other members in the arm if he kills their target first, knowing this would leave them without a limb. In one of his games, Kitazaki decides to kill their king, the Arch-Orphnoch, a being [[WouldHurtAChild living inside the body of a little boy]], just to prove his superiority, despite having the information that this would result in the extinction of his entire race.
** [[MadScientist Masahiko Minami]] is an amoral scientist who [[FantasticRacism believes the Orphnochs deserve to be experimented on]]. Introduced stopping a police investigation, Minami recruits an innocent detective to spy on an Orphnoch, and orders his death when the man began sympathizing with Orphnochs. In his facility, Minami keeps an Orphnoch inside a glass box, calling him an "abomination". Minami believes that if humanity accepts the Orphnochs as equal beings, then humans will not be "pure" anymore, seeking to disable their shapeshifting abilities so they can die as monsters. Making a deal with Smart Brain to use Orphnochs as weapons, Minami captures Yuka and electrocutes her, ignoring complaints that the experiment could kill her, as he considers her a "worthless life". When she is saved by the Orphnoch he kept in a box, Minami sets up a squad of heavily armed officers to eliminate Yuka, Kiba and Takumi, indirectly causing her death. When his base is attacked by an enraged Kiba, Minami leaves his staff to die and escapes, but is later found and killed by him, spending his last moments laughing at his face and stating that the Orphnochs will never succeed. Despite his limited screentime, Minami proved himself to be far more malicious than many Orphnochs.

** [[MadScientist Professor Ryoma Sengoku]]/[[GreaterScopeVillain Kamen Rider Duke]] is a researcher who created most of the Armored Rider gears. Intending to [[AGodAmI become a god]] with the Forbidden Fruit, Ryoma will exploit and backstab anyone to get what he desires and is a DirtyCoward who will use any cheap tactic to win. Damaging Helheim Forest with his experiments, threatening to destroy the world, Ryoma reacts with apathy. Manipulating Mitsuzane Kureshima into almost killing Kouta Kazuraba by promising to save another's life, Ryoma reveals his promise to be a lie before murdering Mitsuzane's LoveInterest in cold blood, taking the Forbidden Fruit which was fused with her heart to obtain its power for himself.

* ''Series/KamenRiderBlade'': In the battle royale to become the dominant species, many competitors had good qualities, but these two only care about themselves and crossed the ultimate line in an attempt to achieve victory:

** ''The Last Judgement'': [[HalfHumanHybrid Einosuke Mido]]/[[WouldHurtAChild Kamen Rider Amazon Neo Alpha]] is the militant anti-Amazon director of the Amazon Livestock Project and one of the worst examples of a BoomerangBigot in the franchise. As a human-Amazon hybrid working for the pro-human leader of 4C, Mido keeps the original Alpha as his slave and routinely takes his cells to raise herbivore Amazon children, which he brainwashes with the nihilistic philosophy that they are born to serve humans, converting an {{orphanage|Of Fear}} into his own Amazon Farm. When the orphans are ready, Mido sells them to rich humans and they are butchered to be made into exquisite food. After one of his orphans retaliates by killing an important politician who would greenlight his project, Mido is furious to see that such "cattle" could "dare defy noble humans" and rampages through the orphanage and outside, gunning down several orphans in his path while informing them that "cattle don't need dreams".

* ''Film/KamenRider555ParadiseLost'': [[SociopathicSoldier Leo]]/[[PsychoForHire Kamen Rider Psyga]], the Lion Orphnoch and Murakami's [[TheHeavy top henchman]] from this alternate continuity and its prequel ''Lost World'', is, like his inspiration--the aforementioned Kitazaki--a normally calm yet cruel BloodKnight who is feared by humans and Orphnoch alike. Leo was given the Psyga Gear after having found an extremely injured Murakami and demanding an Emperor Belt for himself, or else he would leave him to die, joining Smart Brain's paramilitary unit solely to kill humans and have a chance to fight with other Orphnoch. Leo leads the Riotroopers in the genocidal campaign against the human population, hunting down and massacring any humans that they can find. [[EstablishingCharacterMoment Introduced]] murdering three members of his own race with no hesitation, Leo gleefully participates in attacks against the Human Liberation Army at their sanctuary, personally killing Kusaka and leaving several civilians dead or injured, later taking the opportunity to bomb the place. Shortly after kidnapping Mari, Leo tried to stop Takumi from saving her, distracting him while she would be devoured by a monster.

[[AC:Literature-Exclusive]]

* ''Manga/KamenRiderKuuga'' [[Manga/KamenRiderKuuga manga]], by Creator/ToshikiInoue et al.: [[StarterVillain Akira Harada]] is the psychotic SerialKiller hunting down women in Tokyo at same time in which the aforementioned N-Daguva-Zeba was reawakened. A registered sex offender, Harada had tried killing himself for his goddess, and when he failed, Harada came up with the idea of "sharing his dream" with other people. Prior to having his identity revealed via DNA analysis, Harada had already murdered four women; by opening their chests, filling them with gunpowder, and burning them alive so they could become "human fireworks". When encountered by the detective investigating his murders, [[FriendOnTheForce Kaoru Ichijo]], Harada had killed another woman, and laughed at her death. Transported to an ambulance after attempting suicide, Harada slits the driver's throat and brags about being able to resume his serial killings. Harada is found by the Spider Gurongi on the parking lot, and when he sees the remains of the creature's victims, he feels joy, seeing this as his goddess's work. A [[PsychopathicManchild childish maniac]] with an obsession for fireworks, Harada was proof that [[HumansAreTheRealMonsters the Gurongi are not the only monsters]] roaming Tokyo.