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* ''Film/KamenRiderXKamenRiderGaimAndWizardTheFatefulSengokuMovieBattle'': [[TheAssimilator The Ogre Phantom]] is a power-hungry, cannibalistic Phantom who [[CannibalismSuperpower hunts and devours other Phantoms to gain their abilities]]. Unable to be contained by Wiseman, Ogre targeted [=WizarDragon=] to be his next victim, intending on devouring him to become the strongest Phantom in existence. Stealing the Hope Ring from Haruto, Ogre uses it to resurrect a despair-filled Koyomi, [[KickTheDog asking]] if he will get her killed again or leave her alive to wreak havoc. Invading Haruto's Underworld with Legion's powers, Ogre attempted to consume [=WizarDragon=], [[EvilCannotComprehendGood incapable of realizing that it was now Haruto's symbol of determination]].

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* ''Film/KamenRiderXKamenRiderGaimAndWizardTheFatefulSengokuMovieBattle'': ''Film/KamenRiderXKamenRiderGaimAndWizardTheFatefulSengokuMovieBattle'':
** ''Series/KamenRiderWizard: The Promised Place'':
[[TheAssimilator The Ogre Phantom]] Phantom]], the first BigBad, is a power-hungry, cannibalistic Phantom who [[CannibalismSuperpower hunts and devours other Phantoms to gain their abilities]]. Unable to be contained by Wiseman, Ogre targeted [=WizarDragon=] to be his next victim, intending on devouring him to become the strongest Phantom in existence. Stealing the Hope Ring from Haruto, Ogre uses it to resurrect a despair-filled Koyomi, [[KickTheDog asking]] if he will get her killed again or leave her alive to wreak havoc. Invading Haruto's Underworld with Legion's powers, Ogre attempted to consume [=WizarDragon=], [[EvilCannotComprehendGood incapable of realizing that it was now Haruto's symbol of determination]].determination]].
** ''Series/KamenRiderGaim: Sengoku Battle Royale!'': [[HeroKiller Bujin Gaim/Kamen Rider Bujin Gaim]], the second BigBad, is the alternate counterpart of Kamen Rider Gaim in an AlternateUniverse where warring tribes accompanied by Bujin Riders strive for supremacy. Beholden to no lord, unlike his fellow Bujin Riders, Gaim leads his armies and exterminates clan after clan in his path of conquest, tearing apart countries while [[YourSoulIsMine capturing the souls]] of the Bujin Riders and massacring everyone else. With an army of enslaved Bujin Riders and the power of the "Miko of Fate" whom he seeks to sacrifice, Bujin Gaim desires nothing less than to [[TakeOverTheWorld rule the world]].


* ''Series/KamenRider'': Former Nazi, [[InsaneAdmiral Colonel Bakarashin Iinodevitch Zol]], joined Shocker and quickly gets a reputation for brutality. Transferred to Japan to deal with Kamen Rider 2, Zol brainwashes children into become Shocker troops and gases an entire town. [[BadBoss Apathetic to the fates of his own soldiers]], Zol dismisses their deaths and even tests the powers of a resurrected mummy-like kaijin by letting him murder one of his mooks. Using another infectious kaijin, Zol has him kill a group of innocents, forcibly converting the survivor into a disease-carrier to spread more suffering. In [[Series/KamenRiderV3 the sequel series]], Zol works with Doctor G to unleash [[DeadlyGas toxic gas]] in Hokkaido and killing the innocent civilians.

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* ''Series/KamenRider'': Former Nazi, [[InsaneAdmiral ''Series/KamenRider'':
** [[CardCarryingVillain
Colonel Bakarashin Iinodevitch Zol]], Zol]] is a former Schutzstaffel (SS) officer who lost his left eye when gas leaked from one of the chambers at the Auschwitz concentration camp. Proud of his war crimes and his past as a high-ranking Nazi, Zol joined Shocker Shocker's Middle East Branch after the end of {{UsefulNotes/World War II}} and quickly gets got a reputation for brutality. Transferred to Japan to deal with Kamen Rider 2, Zol brainwashes children into become becoming ChildSoldiers for Shocker troops and gases an entire town. [[BadBoss Apathetic to the fates of his own soldiers]], soldiers, Zol dismisses their deaths and even tests the powers of a resurrected mummy-like kaijin Kaijin by letting him murder one of his mooks. Using another infectious kaijin, Kaijin, Zol has him kill a group of innocents, forcibly converting the survivor into a disease-carrier to spread more suffering. In [[Series/KamenRiderV3 the sequel series]], Zol works is revived by Doktor G and assists him in spreading a DeadlyGas across the country.
** [[FromNobodyToNightmare General Black]] is the sole commander of Gel-Shocker and the Great Leader's [[TheHeavy representative]] after the fall of Shocker. Originally a young conscript in the Imperial Russian Army, Black stood out as a cruel SociopathicSoldier who caught the attention of Nikolai II himself, rising to the top of the military hierarchy
with Doctor G his sadistic methods. After the Empire collapsed, Black was invited to unleash [[DeadlyGas toxic gas]] in Hokkaido join Geldam and killing traveled to the innocent civilians.African deserts, training their soldiers there. When the Great Leader proposed to merge their organizations in an alliance, Black gladly accepted the offer and provided him with a new generation of operatives, sending his underling to hunt down the Shocker soldiers who were marked for execution; all Gel-Shocker soldiers must take a drug called Gelper every three hours, or else they [[SpontaneousHumanCombustion combust alive]]. Given the task of eliminating the Shocker scientists, Black [[HopeSpot releases them]], only to gas their bus in an experiment. Putting the lives of millions of people at risk with his plans, Black sends a Kaijin to test his abilities by unleashing his corrosive gas inside an entire apartment complex, and orders the mass kidnapping of civilians to expand Gel-Shocker's personnel by performing surgery on them whenever he feels like it, later brainwashing children to be part of a new unit of ChildSoldiers and almost making them consume Gelper. In the [[Series/KamenRiderV3 sequel series]], Black is revived by Doktor G and assists him in spreading a DeadlyGas across the country.



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[[folder: Film-Exclusive]]Film]]



* ''Series/KamenRiderDenO: 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.

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* ''Series/KamenRiderDenO: I'm Born'': [[StrawNihilist Gaoh/Kamen Rider Gaoh]] is a thief-king an infamous time criminal who specializes in stealing Time Trains, and [[FallenHero rogue Rider]] who leads a is the leader of his own gang of renegade Imagin, Imagin to further his selfish goals, wishing nothing more than the [[OmnicidalManiac [[TheEndOfTheWorldAsWeKnowIt 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, wasteland and planning to repeat on [[OmnicidalManiac repeating this process with the entire world.world]].
* ''Series/KamenRiderKiva: King of the Castle in the Demon World'': [[SatanicArchetype Arc/Kamen Rider Arc]] is the ancient ruler of the Legendorga and a mortal enemy to all the other Demon Races for his genocidal behavior. Countless years after being [[SealedEvilInACan sealed]] within a coffin by the first Kiva, Arc invaded the body of death row inmate Takashi Sugimura when he accidentally found his coffin, preventing him from aging or getting executed for 22 years. In 2008, Arc helped Sugimura in breaking out of prison by releasing an energy blast that [[CopKiller killed all the officers]] around him. Reunited with his loyal subordinates, Arc places Sugimura in a catatonic state until he's fully revived within him, resuming his role as the lord of the Legendorga and planning on annihilating humanity. Using the power of the Mummy Legendorga to enslave humans en masse and start a ZombieApocalypse, Arc magically reproduces the screams of his victims with his own instruments to [[LovesTheSoundOfScreaming enjoy their suffering]]. When Wataru finally reaches Arc, he forcibly baptizes Wataru into a Half-Fangire Half-Legendorga creature to make him his own pet as a more sadistic way to end Kiva's line, ordering Wataru to murder his own father.


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* ''Series/KamenRiderGaim: Gaiden: Kamen Rider Duke/Kamen Rider Knuckle'': [[FarEastAsianTerrorists Kugai Kudo]]/[[AGodAmI Kamen Rider Saver]] is the former director of the Yggdrasill Corporation Laboratory before Ryoma Sengoku. After having his physical body destroyed during Ryoma's first experiment involving a Lockseed, Kudo became a supernatural entity who proceeded to form his own ApocalypseCult, the Black Bodhi. Mass-producing the Zankuro Lockseeds, Kudo brainwashes innocent civilians with them and forces its users to commit suicide bombings, leaving the man behind Neo Baron to carry out his legacy by activating the Saver System, which would wipe out all of Zawame City except for the "strong". Returning in the TieInNovel, Kudo provides the TheMafiya and a rebel army from a South Asian country with equipment, including the Zankuro Lockseeds. Spreading a wave of crime in Zawame City by giving the Zankuro Lockseeds to a gang leader, Kudo manipulates more people into joining his cult as the only way to salvation and has the Saver System control the minds of countless people in the city, planning on assimilating all of humanity into Overlords.

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* ''Film/KamenRiderDecadeAllRidersVsDaiShocker'': [[TheChessmaster Nobuhiko Tsukikage]] is a slimy member of Dai-Shocker who, through treachery and manipulation, became their new Great Leader. Acting as the seemingly loyal butler of the Kadoya family, Tsukikage's real identity is that of [[Series/KamenRiderBlack Shadow Moon]] from another reality where [[AdaptationalVillainy he lacks all of his original counterpart's sympathetic qualities]]. Keeping a close eye on Sayo Kadoya for possessing the source of Dai-Shocker's power, the Stone of the Earth, Tsukikage manipulates Tsukasa with the belief that he could stop the destruction of worlds by defeating the previous Riders, helping him in setting up the battle royal tournament, which doubles as a ritual to raise the Dai-Shocker Castle. After Tsukasa briefly resumes his role as the Great Leader of Dai-Shocker, Tsukikage takes advantage of Sayo's hatred towards her brother to organize a coup, [[TheUsurper swiftly overthrowing him]] to assume the throne for himself. Under his leadership, Dai-Shocker launches an ultimatum on the multiverse, ordering thousands of their own soldiers to [[SuicideAttack perform kamikaze attacks]] and then releasing a legion of monsters to slaughter those who survived as part of their quest to assimilate all worlds into an interdimensional dictatorship.


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* ''Recap/KamenRiderBuildNEWWORLDKamenRiderCrossZ'': [[GreaterScopeVillain Killbus/Kamen Rider Killbus]] is the flamboyant king of the Blood Tribe and Evolto's abusive older brother who turned his own people into a faction of intergalactic exterminators to [[OmnicidalManiac kill everything that exists in the universe]], including himself, for fun. Years before the events of the show, Killbus [[WhereIWasBornAndRazed destroyed his own home planet]] and ordered the rest of the Blood Tribe to begin their campaign of mass genocide to annihilate other civilizations across the universe. Searching for his brother to reclaim the Pandora Box for himself, Killbus massacres a news team and tries to kill him to finally achieve his destructive dream.


** [[DragonWithAnAgenda Masahiko Minami]] is a radical human [[MadScientist scientist]] working for Smart Brain who belives that Orphnochs [[FantasticRacism 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 [[BadBoss 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. Existing solely to show that HumansAreTheRealMonsters, Minami proved himself to be far more evil than many Orphnochs.

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** [[DragonWithAnAgenda [[MadScientist Masahiko Minami]] is a radical human [[MadScientist scientist]] working for Smart Brain who belives that Orphnochs xenophobic National Police Agency officer and [[FantasticRacism deserve human supremacist]] who leads an opposition against Orphnochs to [[FinalSolution purge all of them]], living by his own sociopathic dilemma of using those who allow themselves to be experimented on]].used. 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 has an Orphnoch kept locked inside a glass box, calling him an "abomination". Minami believes that if humanity accepts the Orphnochs box [[AndIMustScream as equal beings, then humans will not be "pure" anymore, seeking his own guinea pig]], conducting inhumane experiments to disable their shapeshifting abilities so they can die as monsters. revert them back to human form. Making a deal with Smart Brain to use Orphnochs as weapons, have more subjects, Minami captures Yuka and electrocutes her, ignoring complaints that the experiment operation could kill her, as he considers her a "worthless life". life" anyway. When she is saved by the his prisoner, Minami promises that he is trying to work towards human and Orphnoch he kept in a box, Minami cooperation, but sets up a squad of heavily armed officers soldiers to eliminate Yuka, Kiba and Takumi, indirectly causing her death. When his base the laboratory is attacked by an enraged Kiba, Minami [[BadBoss leaves his staff to die]] and escapes, but is later escapes to save his own skin. When he's found and killed by him, spending Kiba, Minami spends his last moments laughing at his face and stating that the Orphnochs will never succeed. Existing solely to show that HumansAreTheRealMonsters, Minami proved himself to be far more evil than many Orphnochs.


** "[[Recap/KamenRiderZiOEp11ZiOOnParade2018 Zi-O On Parade 2018]]" & "[[Recap/KamenRiderZiOEp12ThisIsMyXMyStage2013 This is My x My Stage 2013]]": [[TinTyrant Asura]]/[[Series/KamenRiderGaim Another Gaim]] is a member of Team Baron who, after being kicked out by Kaito Kumon, is transformed into an [[Characters/KamenRiderZiOAnotherRiders Another Rider]] by Swartz and used his power to [[ItsAllAboutMe always be on the top]]. Asura sends any who question him or get in his way like Kaito and Geiz Myōkōin--which he did to stop Geiz from saving civilians attacked by Ora and Swartz--to an artificial version of [[EldritchLocation Helheim Forest]], isolating them for five years until they were finally released. In this eldritch and visceral forest, Asura has monsters that will hunt his victims down, caring for only himself and his dreams.

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** [[ItsAllAboutMe Asura]]/[[Series/KamenRiderGaim Another Gaim]], from "[[Recap/KamenRiderZiOEp11ZiOOnParade2018 Zi-O On Parade 2018]]" & and "[[Recap/KamenRiderZiOEp12ThisIsMyXMyStage2013 This is My x My Stage 2013]]": [[TinTyrant Asura]]/[[Series/KamenRiderGaim Another Gaim]] 2013]]", is a member of Team Baron who, after being kicked out by Kaito Kumon, is transformed into an [[Characters/KamenRiderZiOAnotherRiders Another Rider]] by Swartz and used his power to [[ItsAllAboutMe always be on the top]]. top. Asura sends any who question him or get in his way like Kaito and Geiz Myōkōin--which Myōkōin—which he did to stop Geiz from saving civilians attacked by Ora and Swartz--to Swartz—to an artificial version of [[EldritchLocation the eldritch Helheim Forest]], Forest, isolating them for five years until they were finally released. In this eldritch and visceral forest, Asura has monsters that will hunt his victims down, caring for only himself and his dreams.


** [[BloodKnight Isaka]]/[[AgentPeacock Peacock Undead]] exemplifies how low [[ManipulativeBastard manipulative bastards]] can go. As the first Category Jack Undead, he designed Rider System 3, a belt that allows the user to transform into Kamen Rider Leangle. Unfortunately, that same belt requires using an improperly sealed Ace card that contains the Spider Undead, meaning that its user would be mentally enslaved by the Undead (as later seen with Mutsuki). After designing the corrupted Rider System, he brainwashed many people that he was going to use as expendable slaves to create his "Ultimate Rider". When this plan failed, Isaka turns his attention to Sakuya Tachibana and attempts to retrieve him as a prototype user. Isaka knows about Tachibana's subconscious fear and takes advantage of it to [[CurbStompBattle curbstomp]] him. Isaka tricks his defeated opponent to getting addicted to [[FantasticDrug Schuld Ketsner seaweed]], lying that the aggression-inducing plant would eliminate fear. [[spoiler:When Tachibana's girlfriend Sayoko notices her lover's addiction, Isaka smugly kills her for attempting to clean up her lover.]]

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** [[BloodKnight Isaka]]/[[AgentPeacock Peacock Undead]] exemplifies how low [[ManipulativeBastard manipulative bastards]] can go. As the first Category Jack Undead, he designed Rider System 3, a belt that allows the user to transform into Kamen Rider Leangle. Unfortunately, that same belt requires using an improperly sealed Ace card that contains the Spider Undead, meaning that its user would be mentally enslaved by the Undead (as later seen with Mutsuki). After designing the corrupted Rider System, he brainwashed many people that he was going to use as expendable slaves to create his "Ultimate Rider". When this plan failed, Isaka turns his attention to Sakuya Tachibana and attempts to retrieve him as a prototype user. Isaka knows about Tachibana's subconscious fear and takes advantage of it to [[CurbStompBattle curbstomp]] him. Isaka tricks his defeated opponent to getting addicted to [[FantasticDrug Schuld Ketsner seaweed]], lying that the aggression-inducing plant would eliminate fear. [[spoiler:When When Tachibana's girlfriend Sayoko notices her lover's addiction, Isaka smugly kills her for attempting to clean up her lover.]]



** [[DragonInChief Redyue]] is the worst of the diabolical Overlord Inves. As a vile, selfish, and ManipulativeBitch, she corrupts Mitsuzane Kureshima into becoming her puppet and uses him to obtain human subjects for a machine that would revive the dead. She aggravates the humans into launching missiles, thereby forcing her superior Roshuo to redirect the missiles to America and to declare war against humanity. She is also not above MindRape, as seen when she tries to mentally break Kouta Kazuraba by portraying him in a hallucination as an Inves being attacked by his former mentor Yuya. Moreover, Redyue has a sickening obsession over backstabbing and killing those close to her, as seen when she ruthlessly kills [[spoiler:Roshuo]] after the latter defeats Kouta and Kaito Kumon. While the rest of her fellow Overlords, except for [[OnlySaneMan Roshuo]], were definitely evil themselves, Redyue stands out for her willingness to use any means necessary to play mind games with, and to commit genocide against, humanity, simply ForTheEvulz.

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** [[DragonInChief Redyue]] is the worst of the diabolical Overlord Inves. As a vile, selfish, and ManipulativeBitch, she corrupts Mitsuzane Kureshima into becoming her puppet and uses him to obtain human subjects for a machine that would revive the dead. She aggravates the humans into launching missiles, thereby forcing her superior Roshuo to redirect the missiles to America and to declare war against humanity. She is also not above MindRape, as seen when she tries to mentally break Kouta Kazuraba by portraying him in a hallucination as an Inves being attacked by his former mentor Yuya. Moreover, Redyue has a sickening obsession over backstabbing and killing those close to her, as seen when she ruthlessly kills [[spoiler:Roshuo]] Roshuo after the latter defeats Kouta and Kaito Kumon. While the rest of her fellow Overlords, except for [[OnlySaneMan Roshuo]], were definitely evil themselves, Redyue stands out for her willingness to use any means necessary to play mind games with, and to commit genocide against, humanity, simply ForTheEvulz.



** [[MadScientist Professor Tenjuro Banno]]/[[BigBad Kamen Rider Gold Drive]] is an [[ItsAllAboutMe egotistical]], sociopathic scientist with a god complex. After being refused funding by a potential investor, Banno has one of his Roidmude androids, Roidmude 002/Heart, assume the man's form and tortures it to take out his anger. Inserting negative emotions into the Roidmudes out of spite against his former partner, Banno's abuse leads to them becoming violently unstable, going on to rampage and kill countless people. Even after his death, Banno turns himself into a VirtualGhost, manipulating his own son into releasing his spirit before trying to kill him. Banno manipulates [[spoiler:Medic into being operated on, leaving her a puppet loyal to him and forces Heart to serve him, lying that he will restore Medic if he does so]]. Ultimately planning to digitize the entire world, Banno intends to only give robotic bodies to [[AGodAmI those who will bow to him]].

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** [[MadScientist Professor Tenjuro Banno]]/[[BigBad Kamen Rider Gold Drive]] is an [[ItsAllAboutMe egotistical]], sociopathic scientist with a god complex. After being refused funding by a potential investor, Banno has one of his Roidmude androids, Roidmude 002/Heart, assume the man's form and tortures it to take out his anger. Inserting negative emotions into the Roidmudes out of spite against his former partner, Banno's abuse leads to them becoming violently unstable, going on to rampage and kill countless people. Even after his death, Banno turns himself into a VirtualGhost, manipulating his own son into releasing his spirit before trying to kill him. Banno manipulates [[spoiler:Medic Medic into being operated on, leaving her a puppet loyal to him and forces Heart to serve him, lying that he will restore Medic if he does so]].so. Ultimately planning to digitize the entire world, Banno intends to only give robotic bodies to [[AGodAmI those who will bow to him]].



* ''Series/KamenRiderExAid'': [[BigBad Masamune Dan]]/[[KillerGameMaster Kamen Rider Cronus]] is the first CEO of Genm Corp., a game company he uses to upload people into the digital world. First appearing as a victim of his son, Kuroto's, misdeeds, it is revealed that Masamune willingly allowed his child to infect and kill countless people for his own plans. After taking charge of the deadly video game, ''[[TheMostDangerousVideoGame Kamen Rider Chronicle]]'', Masamune tricks people into playing the game, collecting their data once they are in it to control their lives. Destroying any who oppose him, Masamune also uses his control of data to [[spoiler:delete a woman when her lover refuses to murder a heavily injured Taiga]] for Masamune. Reprogramming the FinalBoss of ''Chronicle'' so it will digitize the entire world, Masamune [[ControlFreak seeks to control everyone's life]]. When offered the chance for redemption, Masamune kills himself, making it impossible to revive those who died in his game, controlling and spiteful to the end.

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* ''Series/KamenRiderExAid'': [[BigBad Masamune Dan]]/[[KillerGameMaster Kamen Rider Cronus]] is the first CEO of Genm Corp., a game company he uses to upload people into the digital world. First appearing as a victim of his son, Kuroto's, misdeeds, it is revealed that Masamune willingly allowed his child to infect and kill countless people for his own plans. After taking charge of the deadly video game, ''[[TheMostDangerousVideoGame Kamen Rider Chronicle]]'', Masamune tricks people into playing the game, collecting their data once they are in it to control their lives. Destroying any who oppose him, Masamune also uses his control of data to [[spoiler:delete delete a woman when her lover refuses to murder a heavily injured Taiga]] Taiga for Masamune. Reprogramming the FinalBoss of ''Chronicle'' so it will digitize the entire world, Masamune [[ControlFreak seeks to control everyone's life]]. When offered the chance for redemption, Masamune kills himself, making it impossible to revive those who died in his game, controlling and spiteful to the end.



* ''Kamen Rider W Returns: Eternal'': [[MorallyAmbiguousDoctorate Dr. Prospect]]/[[BigBad Eyes Dopant]] is a Foundation X scientist who kidnapped people from all over the world to make them into, in his own words, "lab rats" for his Quark Project by giving them PsychicPowers. When he arrives on the scene, every one of these people with psychic powers are utterly terrified of him, showing how horrifically he treated them. Even worse is his Heaven's Fall plan, which was so vile that Utopia Dopant [[EvenEvilHasStandards considered it a brutal act]]. Prospect would blast the area with an electric pulse and that would kill anyone that had not lived up to his standards for the project, referring to this as "cleaning out the test pool". When Daido foils his plan, it is revealed that was merciful compared to what happens if they try to escape him. The eyes he implanted on them to watch them are used to kill them when they leave his compound. Dr. Prospect then [[EvilLaugh laughs his head off]] at the fact he'd just slaughtered a village of innocent people while Katsumi is in shock over the massacre of the village he'd tried to save. His actions are so horrific that it [[DrivenToMadness drove]] [[spoiler:Katsumi]] insane.

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* ''Kamen Rider W Returns: Eternal'': [[MorallyAmbiguousDoctorate Dr. Prospect]]/[[BigBad Eyes Dopant]] is a Foundation X scientist who kidnapped people from all over the world to make them into, in his own words, "lab rats" for his Quark Project by giving them PsychicPowers. When he arrives on the scene, every one of these people with psychic powers are utterly terrified of him, showing how horrifically he treated them. Even worse is his Heaven's Fall plan, which was so vile that Utopia Dopant [[EvenEvilHasStandards considered it a brutal act]]. Prospect would blast the area with an electric pulse and that would kill anyone that had not lived up to his standards for the project, referring to this as "cleaning out the test pool". When Daido foils his plan, it is revealed that was merciful compared to what happens if they try to escape him. The eyes he implanted on them to watch them are used to kill them when they leave his compound. Dr. Prospect then [[EvilLaugh laughs his head off]] at the fact he'd just slaughtered a village of innocent people while Katsumi is in shock over the massacre of the village he'd tried to save. His actions are so horrific that it [[DrivenToMadness drove]] [[spoiler:Katsumi]] Katsumi insane.

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![[Administrivia/SpoilersOff All spoilers are unmarked]]. Administrivia/YouHaveBeenWarned!


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* ''Series/KamenRiderZiO'': In this battle across time to become a king which marks the end of the Heisei era, these stand out as vile contenders for that throne:
** [[FutureMeScaresMe Sougo Tokiwa]]/[[TheCaligula Kamen Rider Oma Zi-O]] from the year 2068 is the Demon King of Time of the future who rules over the world in a totalitarian dictatorship. Once an eccentric, lonely but seemingly harmless underachiever who dreamed of becoming a king, Sougo rose to [[FromNobodyToNightmare become the most powerful Kamen Rider in history]] and used his newfound powers to establish a so-called military rule by causing worldwide destruction, killing billions and turning earth into a desolate wasteland for him to [[DystopiaJustifiesTheMeans control what remained of humanity]]. In 2068, Sougo's actions force the survivors to live in ghettos, and he personally annihilates the resistance that was formed to combat him, recruiting one of their captains as his own fanatical prophet and sending him back to the past to serve as a mentor to the younger Sougo, [[EvilMentor motivating him]] to follow his same path. Revealing that the true extent of his power could destroy time and space, Sougo openly desires to see which timeline his past-self would destroy and how he would go on about it.
** [[TheChessmaster Swartz]]/[[Series/KamenRiderDecade Another Decade]], head of the [[Characters/KamenRiderZiOTimeJackers Time Jackers]], is a sociopathic prince from another timeline. Enraged that his sister would inherit the throne over him, Swartz set up a bus crash to kill multiple adults and [[WouldHurtAChild brainwash children]] to see who was worthy to become the powerful Oma Zi-O as a vital part of his plan. Manipulating others by turning them into monstrous Another Riders to spread destruction, Swartz is happy to murder any heroes in his way as he seeks his ultimate goal: to merge the timelines into one and [[OmnicidalManiac then destroy them all]], killing every being in the multiverse, so he may become a hero to his own world and rule it himself. When he is exposed, he happily tries to eliminate any of his old allies, even trying to murder his own sister.
** "[[Recap/KamenRiderZiOEp11ZiOOnParade2018 Zi-O On Parade 2018]]" & "[[Recap/KamenRiderZiOEp12ThisIsMyXMyStage2013 This is My x My Stage 2013]]": [[TinTyrant Asura]]/[[Series/KamenRiderGaim Another Gaim]] is a member of Team Baron who, after being kicked out by Kaito Kumon, is transformed into an [[Characters/KamenRiderZiOAnotherRiders Another Rider]] by Swartz and used his power to [[ItsAllAboutMe always be on the top]]. Asura sends any who question him or get in his way like Kaito and Geiz Myōkōin--which he did to stop Geiz from saving civilians attacked by Ora and Swartz--to an artificial version of [[EldritchLocation Helheim Forest]], isolating them for five years until they were finally released. In this eldritch and visceral forest, Asura has monsters that will hunt his victims down, caring for only himself and his dreams.


* ''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".

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* ''Kamen Rider Heisei Generations FOREVER'' (''[[Series/KamenRiderBuild Build]]''[=/=]''[[Series/KamenRiderZiO Zi-O]]'' crossover): ''Film/KamenRiderHeiseiGenerationsFOREVER'': [[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/KamenRiderStronger'': [[BadassInANiceSuit Mr. Titan]] is the first and worst executive of Black Satan. Once a suave criminal who quickly jumped into the opportunity to join Black Satan, Titan rose through their ranks until he became one of the Great Leader's CoDragons, supervising and overseeing the Kikkaijin on the field to make sure that they are successful while being [[BadBoss cruel towards his own men]]; Titan is involved in numerous destructive operations, including but not limited to: tainting the school lunches of [[WouldHurtAChild elementary school students]] with capsules of Tetrodotoxin; [[WaterSourceTampering contaminating the water supply]] of a town with a [[PsychoSerum chemical]] that [[HatePlague induces homicidal insanity]]; and using a [[BrownNote cacophonic sound]] to make adults kill children. When Titan gets his hands on the Gamma Bugs, parasites that are capable of killing their hosts, he tests their properties on a captive and makes the man [[ForTheEvulz strangle himself to death for fun]], planning on spreading the Gamma Bugs over Tokyo to help Black Satan in controlling the city, and when that fails, Titan tries to assassinate a sheik to disrupt international relations. Recruiting Black Satan's strongest Kikkaijin to assist him in a plan to export poisoned food worldwide to kill millions and allow Japan to be invaded, Titan is killed after sacrificing a Kikkaijin in an attempt to kill Shigeru Jo. Revived by the Great Leader, Titan earns the enmity of his rival General Shadow for using dirty tactics to win, with one of his first plans after his return being mass-producing a bioweapon for Black Satan, forcing an innocent prisoner to inhale it. Defeated yet again, Titan proposes a handshake before he dies to show that he respects Jo, only to reveal that it was a [[TakingYouWithMe trick to take Jo to hell with him]].



* ''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.

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* ''Series/KamenRiderDouble'': ''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.himself.
** [[BitchInSheepsClothing Makoto Uesugi]]/[[SuperToughness Jewel Dopant]], from "[[Recap/KamenRiderDoubleE41E42JsLabyrinth J's Labyrinth]]", is a vain male model [[ThePerfectionist obsessed with perfection]], with a history of destroying anything he decided didn't meet his standards. Having fallen in love with his female best friend Rui Jojima, Makoto was furious to learn she and their other best friend Satoru Takeda fell in love with each other before he could confess; Makoto responded by purchasing the Jewel Memory and turning Satoru into a diamond ring to force Rui to be his scapegoat as, realizing there's no such thing as a perfect person, he decided to [[AndIMustScream turn various women into perfect diamonds]]. When Rui was able to get the Narumi Detective Agency involved, Makoto played the victim to divert all suspicion to Rui before setting up her death to close the case and flee Futo to turn more women into diamonds. When Rui calls him out on his actions after being saved by Terui, Makoto responds with pride in his actions and standards before attempting to throw the diamondized Satoru into the sea to spite her.


* ''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.

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* ''Series/KamenRiderV3'': [[InsaneAdmiral Marshal Armor]]/[[BadBoss Destron Rider]] Armor]] 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.

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* ''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]]. Beastmen. A [[DiscOneFinalBoss subordinate]] subordinate to Ruler, the Garanda Empire, Gorgos is [[EstablishingCharacterMoment introduced]] pouring incendiary blood over the Amazon rainforest, burning initially operated in TheAmazon and burned a tribe alive and wounding [[TheHero in search of the [=GiGi=] Armlet before following hero Daisuke Yamamoto]]. In his mission Yamamoto to defeat Daisuke and obtain his bracelet, Japan. Aside from targeting Daisuke's friends, Gorgos punishes those who dare to [[YouHaveFailedMe fail him, 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.sun. 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 sends the Beastmen 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.


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* ''Kamen Rider × Kamen Rider [[Series/KamenRiderOOO OOO]] & [[Series/KamenRiderDouble W]] Featuring Skull: Movie War Core'': [[KillerCop Seiichiro "Matsu" Matsui]]/[[SpidersAreScary Spider Dopant]] is the former partner of Sokichi Narumi, who became the first known Dopant with the Gaia Memory of the Spider. [[StalkerWithACrush Obsessed]] with singer Melissa, Matsui threatened the lives of everyone at her concerts if she did not perform to his satisfaction and infected others with spider bombs that would detonate with them [[TouchOfDeath in the presence of their loved ones]]. Surrendering to his sadistic drives and [[DrivenByEnvy jealous hatred]] of his partner, he went on a bombing spree to destroy Futo city, laughing while countless people lost their lives. Even after being defeated, he used a spider bomb to keep Sokichi from ever being near his daughter Akiko again.

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* ''Film/KamenRiderBladeMissingAce'': [[BigBad Junichi Shimura]]/[[BitchInSheepsClothing Kamen Rider Glaive]] is the real identity of the Albino Joker, the EvilCounterpart to both Kazuma Kenzaki and Hajime Aikawa. Joining BOARD as the replacement for Kamen Rider Blade, Shimura became the team leader of the Ace Riders and used them to further his own goals, starting by killing the president of BOARD and then releasing half of the Undeads, allowing them to massacre humans just to seal them again as part of a ritual that would grant him ultimate power, disposing of his two subordinates after they had served their purpose. Sacrificing Amane's life energy to have control over an EldritchAbomination, Shimura was an [[AmbitionIsEvil ambitious monster]] whose need for power knew no limits.


* ''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.

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** [[MadScientist Professor Ryoma Sengoku]]/[[TheHeavy Kamen Rider Duke]] is a researcher for the [[Characters/KamenRiderGaimYggdrasillCorporation Yggdrasill Corporation]] who created most of the Armored Rider gears. Intending Unlike his comrade Takatora Kureshima, Ryoma does not care about saving humanity and secretly desires the Helheim Forest to invade so he can [[AGodAmI become a god]] with the its Forbidden Fruit, not caring about the billions of deaths it would cause. When Takatora's altruism get in the way of his plans, Ryoma will exploit and backstab anyone coldly attempts to get what he desires and is a DirtyCoward who will use any cheap tactic murder him before [[DirtyCoward abandoning everyone else in Zawame City to win. Damaging Helheim Forest with his experiments, threatening to destroy die]] when the world, Overlord Inves invade. Ryoma reacts later makes a deal with apathy. Manipulating Mitsuzane Kureshima into almost killing Kouta Kazuraba by promising to save another's life, Ryoma reveals his promise Mai's life if he kills Kouta Kazuraba, only for him to be a lie before murdering Mitsuzane's LoveInterest in cold blood, taking murder Mai to get the Forbidden Fruit inside of her, which was fused with her heart he gleefully admits to obtain its power for himself.Mitsuzane when he accomplishes the task.

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* ''Film/KamenRiderZO'' manga, by Kazuhiko Shimamoto: [[SpellMyNameWithAnS D(o)ras]] is the monstrous EvilCounterpart of the titular Kamen Rider, and [[AdaptationalVillainy far more evil and intelligent]] than he was in the film. Created by Dr. Mochizuki as Masaru Aso's superior successor, Doras trapped Mochizuki in a pile of biomass when he refused to complete his body and decided to go after his only son, Hiroshi, planning on using the boy as a hostage. After arriving at a junkyard, Doras assembles a body for himself and destroys everything in his path, leaving an entire block filled with corpses before converting Masaru's LoveInterest into a grotesque monster who proceeded to kill even more people, forcing Masaru to end her life. Suspending Hiroshi with tentacles, Doras threatens to execute the boy in front of his father if he doesn't help him in [[AGodAmI ruling the universe as a god]].

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