History Characters / KamenRiderBuildFaust

!!Evolto / Blood Stalk / Kamen Rider Evol

[[caption-width-right:219:[[labelnote:Click here to see Evolto's true form]]\\

In truth, Stalk is just another name for Evolto, an extraterresial lifeform from a distant star that came to Mars with the Pandora Box and used its power to turn the once-green planet into a lifeless wasteland before being defeated in a final duel with the Martian queen Vernage, who destroyed his Evol Driver and left him a helpless mass of sludge. Evolto lay dormant for untold millions of years before an unmanned probe from Earth arrived to the red planet, prompting Evolto to send part of his being along with the probe on its return. The rest of him infected the astronaut that came to Mars next, [[Characters/KamenRiderBuildProtagonists Souichi Isurugi]], taking over his body to use as Evolto's new host as he planned to reclaim his lost half, rebuild his shattered Driver, and bring about the destruction of Earth.

* TwentyFourHourArmor: Unlike Night Rogue, who seems to only wear his armor when needed, Evolto prefers to wear the Blood Stalk armor at all times whenever he is around other villains, to the point it is implied even members of Faust have no idea who he is under the mask. He eventually becomes more lax about this policy after his identity comes out, but still prefers wearing the suit nearly all of the time.

* AliensAreBastards: His true identity as Evolto is an alien whose idea of fun is [[OmnicidalManiac destroying all life on planets]] and who spends most of the show possessing an innocent man to make him do horrible things while [[AndIMustScream fully conscious of everything]].
* AncientEvil: It is [[TimeAbyss not clear exactly]] how old Evolto is, but he has been lying dormant ever since the destruction of the Martian civilization, meaning he is millions of years old at least, and Mars wasn't the first world he has destroyed.
* ArchnemesisDad: As it turns out, the alien that accidentally sired Ryuga was a piece of Evolto, effectively making him Evolt's son, which Evolt eventually acknowledges. This doesn't make Evolto any kinder to him than anyone else and he repeatedly tries to murder him.

* BackFromTheDead: In the Cross-Z V Cinema, Evolto manages to recover from being sacrificed for the New World by attaching a piece of himself to Ryuga which he could regenerate from if it ever came into contact with Pandora's Box.
* BecomingTheMask: Subverted: Stalk's voice changer is initially used to obscure his identity, but after the first reveal about his identity he continues to use it while wearing the suit, unlike almost every other case of a voice changer-using character in the franchise. The second reveal comes with the WhamLine that shows the deeper voice is Evolto's ''actual'' voice, and he was never using the voice changer at all. It is played with some more when even after acquiring his own body, Evolto prefers Soichi's shape, and even mimics his voice while in that form, but this changes nothing about his personality.

** His plans being derailed. Evolto is very cunning and often in control, but the moment something unexpected throws a wrench in his works and sets them back, Evolt does ''not'' take it well.

* BigBad: Evolto is eventually outed as the true encompassing villain of the show, standing above Faust, the three nations, and even Juzaburo Namba. All of the other factions, heroes and villains alike, dance to Evolto's tune as he goads and manipulates them to reach ever-greater heights of destruction in fighting one another, all for the sake of achieving the deadly purpose of the Pandora Box.
* BishonenLine: By his race's standards. It's eventually revealed in the Cross-Z V-Cinema that Evolto's final form is simply himself as he appeared on his home planet, just wearing the Evol Driver. It's the equivalent to if Build's final form was just Sento wearing the Build Driver.

* BlessedWithSuck: The black Pandora Panel and Lost Bottles are secretly this. While having them makes Evoltable to warp between planets and consume their resources, their real function is to make him vulnerable to the white panel, which will use him as a LivingBattery to merge Build's war-torn universe with another one and undo Evolto's reign of terror.
* BlobMonster: Evolto's true nature has shades of this, as his shape-shifting gives the impression of him becoming a mass of liquid and rearranging himself and the parts he separates from his main body assume the form of small blobs of material.
* BodySurf: Evolto first possessed Soichi on Mars, then hopped into Ryuga after he hit Hazard Level 5. Then he did the same to Sento when he reached Hazard Level 6.

* CainAndAbel: Evolto and Killbus don't get along. Both want to wipe out everything in the universe but Evolto wants leave himself alive while Kilbus just wants to destroy everything including himself, which ironically makes Evolt the ''Abel'' to Killbas' Cain.

* ContrastingSequelAntagonist: Despite having a lot of similarities on the surface, the [[ChronicBackstabbingDisorder duplicitous]] and [[EvilIsHammy bombastic]] Evolto/Kamen Rider Evol easily differs a lot from the erriely [[DissonantSerenity composed]] and [[ColdHam low-key]] [[Characters/KamenRiderExAidOthers Masamune Dan/Kamen Rider Cronus]]:
** While being just as much FauxAffablyEvil, TheChessmaster, and an ArchnemesisDad as his predecessor, Evolto is presented as TheSlacker and a {{Troll}} when interacting with others, while Masamune made sure he came across as an [[VillainWithGoodPublicity respectable]] and [[CorruptCorporateExecutive professional CEO]] at all times.
** Both are [[ManipulativeBastard Manipulative Bastards]] who managed to get practically all of the central characters in their respective story [[UnwittingPawn to unknowingly do their bidding in one form or another]] and waited until around the final stretch of their respective series to fully take up the position of the BigBad. But whereas Evolto in ''Build'' is firmly TheManInFrontOfTheMan from the very beginning as a major character, Masamune was TheManBehindTheMan who started out as a ChekhovsGunman in ''Ex-Aid''; his true role in that series not being fully revealed until his show's endgame began.

*** Evolto could also be considered one to the Great Leader from the original Showa ''Series/KamenRider'' series. Both are supernatural forces behind evil organizations and nearly all of the problems faced by the heroes, but whereas the Great Leader was TheManBehindTheMan to all of the terrorist groups he started up and let his minions face the Kamen Riders while generally not do very much himself, Evolto is TheManInFrontOfTheMan who acts as a subordinate within each of the villainous factions he joins all while manipulating their leaders into unwittingly doing his bidding and is very proactive in engaging the heroes.
* TheCorrupter: Through his Pandora Box and its HatePlague, although with Nanba and Utsumi he didn't even need the Box. Evolto also feigns trying to corrupt Sento and Banjo [[SillyRabbitIdealismIsForKids by mocking their idealism]], but corrupting them isn't the goal; manipulating them by implying he ''wants'' to is.
* CrazyPrepared: Evolto put not one but ''two'' contingency plans to revive himself in place after he achieved his Phantom state, even though he believed himself to be invincible at the time.
* CreateYourOwnHero: When Takumi Katsuragi tried to stop Evolto before his plans went into motion, Evolto instead wiped his memories, changed his face and raised him (under the guise of Soichi Isurugi) into Sento Kiryu in order to use him as a pawn in his plans. It worked for most of the series, but then Sento ends up becoming one of the main factors standing between him and ultimate victory just when his plans start to reach their end. What's more, the Genius Bottle, a completely unexpected variable in Evolto's plans and a vital key to stopping him, turns out to be only usable by the kind of person he raised Sento into, a hero of justice.
* CruelMercy: If anything could be considered Evolto's FatalFlaw, it is his love of this trope. He could have opened the Pandora Box as early as episode 12 if he would just killed Nabeshima instead of wiping his memory with amnesia that turned out to be temporary. By episode 39 he came out victorious, completely and totally, but leaves the Riders and humanity as a whole alive when there is nothing that could stop him from killing them all because he wants to turn them into Lost Smash. This act of sadism allows the creation of the Genius [=FullBottle=], the first thing to be a serious threat to Evolto, and his response is to double down and leave Sento alive with the intent of crushing his hopes first. He tops himself in episode 45 by letting his sadism ruin an assured victory ''twice'' in one episode: first by killing Shinobu slowly so that he has time to give his son a final hint, and then by forcing Sento to watch him destroy a planet and then bringing him back to Earth instead of just dumping him out in deep space, which gives Sento time to have the realization that lets him undo Evolt's hard work.

* DeathByIrony: Evolto meets his end at the hands of the same person he molded into a hero — Sento.
* DemonicPossession: Until he gets the Evol Trigger back and active again, Evolto has to use others as host bodies. He spends most of the show in Soichi, then has brief tenures in both Banjo and Sento's bodies before he reclaims the Trigger and stops needing a host. Once he's used to being complete, he can send out chunks of himself to possess others at will, at the cost of not being able to use Black Hole Form unless he's all in one piece.

* EnemyMine: Assists Build and co. in fighting against his AxCrazy StrongerSibling Killbus. Cruel as he may be, Evolto at least has some sense of self-preservation while his brother just wants to destroy everything for fun.

* EvilCannotComprehendGood: Despite his complex knowledge of the human mind, Evolto has difficulty understanding why Banjo would be so fiercely protective of Sento even after learning the truth behind Katsuragi's attempt to murder him. Even if he doesn't understand it, though, he's willing to use it as a tool to manipulate Banjou.
* EvilerThanThou: Evolt proves to be this to ''every other villain'' with the possible exception of Bikaiser from the movie, from Night Rogue to Namba. Namba in particular gets a rude awakening when Evolto decides YouHaveOutlivedYourUsefulness and wipes his faction out in short order.

* EvilLuddite: If his rant towards Sento in episode 35 is to be taken at face value, Evolto believes that science making life more convenient leads to people taking things for granted and eventually getting wrapped up in war. Of course, given that he has spent the series trying to goad Sento into advancing technology for his own purposes, wants to anger Sento enough to raise his Hazard Level ever higher, and has gone out of his way to manipulate all sides into advancing warfare for his plans to wipe out all life, it’s best to take his lines with a grain of salt.
* EvilIsPetty: Evolto is this due to a combination of being both extremely narcissistic and incredibly vindictive. If his ego is bruised, he can't help but try to severely and sadistically punish anyone who bruises his ego. This is a FatalFlaw of his and his biggest weakness, as it comes at the cost of his pragmatism.

* EvilMentor: Because Evolto's schemes need both Banjou and Sento to have extremely high Hazard Levels, he plays a mentor figure whenever they need a push to move forward.

* TheEvilPrince: Since his brother is stated to be the "King" of the Blood Tribe, it could mean that Evolto has royal blood.
* TheFaceless: Evolto swaps between several faces over the course of the show, and when he reveals his own it's so alien that it takes a flashback to Evolto on his home planet to confirm that it even ''is'' his real face. Even after his identity is revealed, he commonly uses the form of Soichi like an untransformed state, although his real untransformed state is identical to his Fever Flow form.

---> '''Evolto:''' You think you can destroy me!? Like hell you will, '''you puny humans!'''

---> '''Evolto:''' So this...is the power of humanity...Then allow me to see this miracle you call the new world through till the end. Ciao...

** {{Wrath}}. Evolto ''cannot'' and ''will not'' tolerate having his ego bruised and will go to great lengths to make those who do so suffer...but in the process loses his pragmatism and gives his enemies openings to strike back.
* FauxAffablyEvil: Both before and after TheReveal of his identity, Evolto is a much more casual and friendly antagonist than Night Rogue, though underneath all of it he is a cruel being whose plan involves wiping out all life on earth. He is also happy to backstab even his own allies, and will even go so far as to reveal information or aid the heroes on occasion, but it is always in service of his own ends.

** Confirmed and [[DeconstructedTrope deconstructed]] as this attitude completely bites him in the ass time and time again. Evolto choosing to indulge his baser instincts over his [[TheChessmaster pragmatism]] results in him being put through the ringer more often than not. It ends up getting him killed in the long run.
* FromASingleCell: Episode 45 reveals that he can store a part of himself inside his Evol Driver which will eventually regenerate into a full body. Shinobu attempts to delay this by storing the Driver in a special container, but unfortunately, Evolto was smart enough to splinter off another segment which possessed Utsumi, rendering his effort moot. This is how Evolto managed to reappear in Build NEW WORLD: Cross-Z by planting a single cell into Banjou after being finished off by Build's [[EleventhHourSuperpower RabbitDragon]] [[FinishingMove Vortex Attack]] Notably, this ability seems unique to him out of the Blood Tribe, as every other member of his species are killed far easier, even the far stronger Killbas. Banjo's Blood Tribe DNA is the only other thing that has this level of regenerative ability, which came from Evolt himself.

* HiddenAgendaVillain: Evolto manages to hide why exactly he wants Sento and Banjo to become stronger for most of the show, only making it clear when it is too late to stop him from taking their bodies.
* HumanoidAbomination: Possession by Evolto alters his host's physiology and gives them bizarre powers, to the point that they're stronger than the Blood Stalk suit ''on their own''. There is also the whole 'possessed by an evil, ancient alien entity' thing. Once he becomes complete, he still chooses to appear human, but frequently reminds the audience he's only pretending to be one.
* HumanityIsInfectious: His time among humanity, his frustration at Sento's delays to his plans, and the direct threat to his life that Build Genius represents eventually lead to Evolto switching from performative mimicry to genuine emotions. It is {{Deconstructed}} by actually making him an ''even more'' dangerous villain, because he can now process emotions like [[UnstoppableRage anger]] and '''''[[ForTheEvulz sadism]]'''''. On top of that, because he can now feel anger he can now ''raise his Hazard Level and become even stronger''. However, it also exacerbates his existing FatalFlaw by making his anger at Sento sufficient that just killing him won't be enough to satisfy Evolto's need for vengeance, which only gives Sento more time to chip away at Evolto's plans.

* INeedYouStronger: One of Evolto's many goals throughout the show is to raise Sento and Ryuga's Hazard Levels, as well as to raise Sento's technical knowledge of Driver creation to the point where he can repair the Evol Driver.

* InvincibleVillain: Early on he holds back his true power because he needs the heroes alive for his plans, so most of his loses are because [[ILetYouWin he wants them to win]]. It is only in the later half of the series that the heroes even begin to catch up to him. Unfortunately, it is also around this time that he gets back his Evol Driver and becomes Kamen Rider Evol, who outclasses all the heroes at the time of his debut, which he claims to only be a small percentage of his true power. Sure enough, every time it seems that the heroes are catching up to him, he manages to unlock more of his power and outclasses the heroes again. Ultimately subverted towards the end, however, as the heroes manage to catch up, something that begins to frustrate and enrage Evolto.

* KarmaHoudini: Despite all the deaths he caused and torment he inflicted on the heroes, Evolto survives the Cross-Z V-Cinema with his life intact and enough power to leave the Earth, an opportunity he immediately decides to take rather than pick another fight with Team Build. He doesn't have the Pandora Box anymore, and doesn't seem to have his world-shattering Black Hole or Fever Flow levels of power anymore either, [[TheBadGuyWins but otherwise Evolt comes out of the movie with pretty much everything he could have hoped for]].

* KnightOfCerebus: Once his true nature as Evolto is revealed, the plot goes from 'merely' the fate of Japan to the fate of the entire planet and eventually the entire ''universe''. He also manages to rack up one of the largest, if not ''the'' largest, onscreen body counts in the history of the franchise.
* LackOfEmpathy: When Yui questions Banjou why he wasn't able to save her students, Evolto (in Banjo's body) just says that he doesn't give a damn about them.
* LastOfHisKind: With the demise of the other three in the movie, Evolto is the last of the Blood Tribe. [[SubvertedTrope Subverted]] in the ''Kamen Rider Cross-Z'' V-Cinema where Evolt's [[StrongerSibling older brother]] Killbas comes to Earth sometime after Evolt's downfall. Played straight again after Killbas bites the dust.
* LesserOfTwoEvils: Compared to his brother Killbus, believe it or not. Evolto is a {{sadist}}ic PlanetEater, but he at least has a sense of self-preservation and can be reasoned with on some level, while Killbus is just AxCrazy and wants to destroy everything ForTheEvulz.

* LukeIAmYourFather: The alien that infected Ryuga's mother and thus turned him into a HalfHumanHybrid was a piece of Evolto, meaning in essence, Evolt is Ryuga's father. After Ryuga regenerates the DNA needed to transform when Evolt stole it, Evolt outright calls him his 'spawn'.

** The reveal of what he ''really'' is also makes it meaningful: Evolto is from a race of PlanetLooters called the Blood Tribe. Thus planets or species he comes across can be considered stock for the Blood Tribe.
** Evolto is a play on evolution and revolt. Evolto's plan involves tricking the heroes into evolving to higher levels, as well as rapidly transitioning through forms himself, and he ultimately revolts against ''everyone'' including the last three members of his own race other than himself. The other meaning for revolt is also apt, as he is irredeemably vile and either horrifies or enrages everyone who knows of him.

* ObviouslyEvil: Evolto makes no attempts in ''any'' of his identities to hide the fact that he is a supervillain.

* OneWingedAngel: Evolto goes through more of these than a ''Manga/DragonballZ'' villain. By the end, including Blood Stalk, he has ''eight'' forms, each progressively stronger than the last.
* OutsideGenreFoe: Until the reveal, the series had been primarily an AfterTheEnd story dealing with a Balkanized Japan and trying to stop a CivilWar from erupting. Then comes Evolto, an alien invader who sends the plot straight into CosmicHorrorStory territory and whose general character and powers are more in line with a shonen Anime BigBad than the typical Kamen Rider villain.
* PersonOfMassDestruction: Evolto is one of only two villains in Kamen Rider history to be a planet buster level power (the other being [[Series/KamenRiderKuuga N-Daguva-Zeba]], who was even with Kuuga's planet busting SuperMode), and has wiped out entire planets by himself. Over the course of the series, we actually see him eat an entire planet with a black hole, as well as Earth's moon.

* PlanetEater: It was initially believed that Evolt was from a race of PlanetLooters, but the truth turned out to be ''far worse.'' Evolto's primary goal on every planet he visits is to consume its resources and move on to the next at the cost of most of the energy he got to get to the next one. Part of the reason he didn't destroy Earth when he had every chance to was the Black Pandora Panel, which when completed enhances his power enough that not only could he warp to other planets without expending energy at all, he could also consume the ''entire planet'' instead of stripping it bare without the need for Pandora's Tower.

* PowerDyesYourHair: A side effect for some of those unfortunate to have his DNA. Sento's hair turned completely white when possessed, and in a world where Evolto didn't exist, Ryuga's hair was completely black instead of brown.

* RetGone: When he was defeated by Build in the finale, the merger of worlds erases him from at least Earth's history. Whether or not it means he is simply already dead and Pandora's Box destroyed without either coming to Earth or he was completely erased from time isn't clear, but as far as the merged Earth is concerned, Evolto never existed. [[SubvertedTrope Subverted HARD!]] as he managed to reappear into the New World in Build NEW WORLD: Cross-Z
* SanityHasAdvantages: Evolto is extremely manipulative, intelligent, and one of the most powerful villains in the history of the franchise...but he's also a raging malignant narcissist fundamentally incapable of taking the most minute of slights to his ego. Evolto repeatedly delays a certain victory in order to make those who bruised his ego suffer more or sate his sadism, and it bites him in the end. Hard.

* SmugSnake: Pun aside, Evolto is an incredibly accomplished fighter and he ''knows it.'' He even catches [=RabbitTank=]'s Vortex Finish in the palm of his hand, compliments the force of the blow, tosses Sento to the side and then remarks on the kick's Hazard Level without even coming close to losing his cool. The only things that can throw him off his game are Best Matches that he has never seen before, and even those usually [[ItOnlyWorksOnce only work once]]. Like most examples of the trope, the cracks in Evolto's master plan begin to form because he believes himself to be smarter than everyone else, and starts toying with his victims when he thinks he's won.
* SmugSuper: As Evolto achieves beyond the fourth phase of his powers, he backs it up by knowing that the heroes can't touch him. As Team Build rise and counterattack, it slowly bites him in the rear big time.

* StoryBreakerPower: By the time he reaches his ultimate form, Evolto can destroy entire city blocks with the aftershocks of a casual kick and summon giant black holes that consume entire planets. Combined with his ability to instantly warp anywhere he desires in the universe with just a thought, Evolto is effectively one of, if not the most, powerful antagonists in Kamen Rider (his only real contenders are [[Series/KamenRiderGaim Rosyuo]], [[Series/KamenRiderAgito the Overlord of Darkness]], and, according to supporting information, [[Series/KamenRiderKuuga N-Daguva-Zeba]]). Removing the {{Macguffin}} from his chest aside, the only real reason he doesn't just kill everyone immediately is because he finds it more fun to watch them suffer.

* ThoseWereOnlyTheirScouts: Subverted. Vernage is shocked only one of his species was able to wipe out Mars, implying this trope, but when other members of his species appear, Evolto is shown to be considerably stronger than any of them (as well as being the only one with an Evol Driver) and they're subservient to him making it clear Evolto is an outlier. Only Kamen Rider Blood is comparable to him, and he requires a mismatch of Build Driver related items to achieve a form on par with the one Evolt ''naturally'' has. In addition, by present day, only five of the Blood Tribe are even left.

* TeethClenchedTeamwork: He partners up with Banjou in their battle against Killbus. While Evolto is eager to work together, Banjo is (justifiably) distrustful of him.
* TimeAbyss: Evolto is at the bare minimum millions of years old and older than life on Earth.

* UltimateEvil: For most of the series, Evolto has no physical form of his own and even once he is complete what he looks like under the armor is hidden. This is despite being one of the most vile and powerful villains in the entire franchise. He only gains an actual face at the end of the series, and unlike most examples more than lives up to it with how powerful and horrifying he is.
* VillainBall: Evolto could have won if he had just killed the other Kamen Riders as soon as he obtained the Black Pandora Panel, but he chose to keep them alive so he could watch them wallow in despair for longer. This provides an opportunity for Rogue to damage his Evol Trigger, buying Sento and Ryuga time to force the Panel out of him.

** He gets an absolutely ''beautiful'' one in episode 48 as Ryuga [[HeroicSacrifice carries him into the void between realities to finish fusing them into a world where the Skywall never existed,]] fruitlessly pounding his fists against Cross-Z Magma and shouting for him to stop. It continues into the episode after, with Evolto furious beyond measure that he's been foiled by the fake hero that ''he'' created. By the end of 49, he's ''still'' convinced he can win despite his power literally being hacked down and Sento delivering the trademark Rider Kick to finish him off, yelling there is no way he can lose until he is ultimately vaporized.
* VoluntaryShapeshifting: Upon becoming whole, Evolto can assume any form he chooses.

* WorldsStrongestMan: Evolto is, by far, the most powerful character in the main ''Kamen Rider Build'' series and one of the most powerful Riders in the franchise (among the riders his only direct competitors are Man of the Beginning Gaim, Post Series-Kamen Rider Decade, Ultimate Kuuga, Killbus and [=Cross-Z Evol=]. He's only unambiguously surpassed by Ohma Zi-O, who combines the powers of all Hesei riders and forms including Evol's). His Black Hole Form is capable of defeating any character in the series and allows him to wipe cities off the face of the planet in moments. Initially only Sento with his [[SuperMode Genius Form]] is capable of matching him but he quickly surpasses him by tapping into the Evol Driver's ability to use emotions for strength, becoming so powerful that Genius and Cross-Z Magma, who by the end of the series are comparative equals AND both stronger than Black Hole was initially, can ''just'' about slow him down for a few moments. His transformation after incorporating the Black Pandora Panel into himself is borderline invincible, capable of destroying planets in moments. It took the combined might of the other four Riders to fight him off the first time. The second time they needed to exploit a weakness from his Evol Trigger to keep him still and then send him to a pocket dimension to weaken him and it still took the deaths of two Riders and Ryuga sabotaging him from the inside to allow Sento to best him. Even then he manages to come back from THAT and recover his full power yet again. In the end the only way Evolt leaves is in his own terms. Essentially deciding that he doesn't want to destroy the Earth anymore.

** In Episode 34, he pulls a PoisonAndCureGambit on the heroes, offering Sento's life in exchange for the Pandora Box and all the remaining Fullbottles. However, this enrages Banjou, who fights so hard that he raises his Hazard Level to 5...which allows Evolto to [[DemonicPossession steal his body]], giving him even more than he wanted in the first place.

* AnimatedArmor: A variation. According to the data found about the Evol Driver, Kamen Rider Evol isn't so much a suit as much as his host [[OneWingedAngel physically transforming]] ''into'' Evolto.

* StrongAndSkilled: [[ContrastingSequelAntagonist Unlike the previous antagonist]] [[Series/KamenRiderExAid Masamune Dan]], Evolto is not reliant on the overwhelming power of his transformations and can fight competently against any Rider with any of his weaker forms. While [[GrandTheftMe possessing Utsumi]], he managed to fight far more effectively as Mad Rogue than Utsumi himself could and was capable of killing Utsumi with his weakest form [=EvolCobra=] despite the fact that Utsumi also wielded an Evol Driver. Unlike Masamune, Evol has a properly honed fighting style that compliments his overwhelming power, which enables him to fight and hold the upper hand against Sento in his [[SuperMode Genius Form]]. [[UnskilledButStrong By contrast]], Masamune only held the upper hand as Kamen Rider Cronus due to his [[GameBreaker ability to stop time]] and was effortlessly beaten by Emu once he gained access to his [[SuperMode Hyper Muteki Form.]]

* GoLookAtTheDistraction: The whole point for Kuwata fighting Build was to distract him long enough for Faust to enact their plan to steal the Pandora's Box.

[[quoteright:192:https://static.tvtropes.org/pmwiki/pub/images/krbu_night_rogue.png]]
[[caption-width-right:192:''Mistmatch! Bat...Ba-Bat...Fire!'']]

!!Evolt / Blood Stalk / Kamen Rider Evol

[[caption-width-right:219:[[labelnote:Click here to see Evolt's true form]]\\

In truth, Stalk is just another name for Evolt, an extraterresial lifeform from a distant star that came to Mars with the Pandora Box and used its power to turn the once-green planet into a lifeless wasteland before being defeated in a final duel with the Martian queen Vernage, who destroyed his Evol Driver and left him a helpless mass of sludge. Evolt lay dormant for untold millions of years before an unmanned probe from Earth arrived to the red planet, prompting Evolt to send part of his being along with the probe on its return. The rest of him infected the astronaut that came to Mars next, [[Characters/KamenRiderBuildProtagonists Souichi Isurugi]], taking over his body to use as Evolt's new host as he planned to reclaim his lost half, rebuild his shattered Driver, and bring about the destruction of Earth.

* TwentyFourHourArmor: Unlike Night Rogue, who seems to only wear his armor when needed, Evolt prefers to wear the Blood Stalk armor at all times whenever he is around other villains, to the point it is implied even members of Faust have no idea who he is under the mask. He eventually becomes more lax about this policy after his identity comes out, but still prefers wearing the suit nearly all of the time.

* AliensAreBastards: His true identity as Evolt is an alien whose idea of fun is [[OmnicidalManiac destroying all life on planets]] and who spends most of the show possessing an innocent man to make him do horrible things while [[AndIMustScream fully conscious of everything]].
* AncientEvil: It is [[TimeAbyss not clear exactly]] how old Evolt is, but he has been lying dormant ever since the destruction of the Martian civilization, meaning he is millions of years old at least, and Mars wasn't the first world he has destroyed.
* ArchnemesisDad: As it turns out, the alien that accidentally sired Ryuga was a piece of Evolt, effectively making him Evolt's son, which Evolt eventually acknowledges. This doesn't make Evolt any kinder to him than anyone else and he repeatedly tries to murder him.

* BackFromTheDead: In the Cross-Z V Cinema, Evolt manages to recover from being sacrificed for the New World by attaching a piece of himself to Ryuga which he could regenerate from if it ever came into contact with Pandora's Box.
* BecomingTheMask: Subverted: Stalk's voice changer is initially used to obscure his identity, but after the first reveal about his identity he continues to use it while wearing the suit, unlike almost every other case of a voice changer-using character in the franchise. The second reveal comes with the WhamLine that shows the deeper voice is Evolt's ''actual'' voice, and he was never using the voice changer at all. It is played with some more when even after acquiring his own body, Evolt prefers Soichi's shape, and even mimics his voice while in that form, but this changes nothing about his personality.

** His plans being derailed. Evolt is very cunning and often in control, but the moment something unexpected throws a wrench in his works and sets them back, Evolt does ''not'' take it well.

* BigBad: Evolt is eventually outed as the true encompassing villain of the show, standing above Faust, the three nations, and even Juzaburo Namba. All of the other factions, heroes and villains alike, dance to Evolt's tune as he goads and manipulates them to reach ever-greater heights of destruction in fighting one another, all for the sake of achieving the deadly purpose of the Pandora Box.
* BishonenLine: By his race's standards. It's eventually revealed in the Cross-Z V-Cinema that Evolt's final form is simply himself as he appeared on his home planet, just wearing the Evol Driver. It's the equivalent to if Build's final form was just Sento wearing the Build Driver.

* BlessedWithSuck: The black Pandora Panel and Lost Bottles are secretly this. While having them makes Evoltable to warp between planets and consume their resources, their real function is to make him vulnerable to the white panel, which will use him as a LivingBattery to merge Build's war-torn universe with another one and undo Evolt's reign of terror.
* BlobMonster: Evolt's true nature has shades of this, as his shape-shifting gives the impression of him becoming a mass of liquid and rearranging himself and the parts he separates from his main body assume the form of small blobs of material.
* BodySurf: Evolt first possessed Soichi on Mars, then hopped into Ryuga after he hit Hazard Level 5. Then he did the same to Sento when he reached Hazard Level 6.

* CainAndAbel: Evolt and Killbas don't get along. Both want to wipe out everything in the universe but Evolt wants leave himself alive while Kilbas just wants to destroy everything including himself, which ironically makes Evolt the ''Abel'' to Killbas' Cain.

* ContrastingSequelAntagonist: Despite having a lot of similarities on the surface, the [[ChronicBackstabbingDisorder duplicitous]] and [[EvilIsHammy bombastic]] Evolt/Kamen Rider Evol easily differs a lot from the erriely [[DissonantSerenity composed]] and [[ColdHam low-key]] [[Characters/KamenRiderExAidOthers Masamune Dan/Kamen Rider Cronus]]:
** While being just as much FauxAffablyEvil, TheChessmaster, and an ArchnemesisDad as his predecessor, Evolt is presented as TheSlacker and a {{Troll}} when interacting with others, while Masamune made sure he came across as an [[VillainWithGoodPublicity respectable]] and [[CorruptCorporateExecutive professional CEO]] at all times.
** Both are [[ManipulativeBastard Manipulative Bastards]] who managed to get practically all of the central characters in their respective story [[UnwittingPawn to unknowingly do their bidding in one form or another]] and waited until around the final stretch of their respective series to fully take up the position of the BigBad. But whereas Evolt in ''Build'' is firmly TheManInFrontOfTheMan from the very beginning as a major character, Masamune was TheManBehindTheMan who started out as a ChekhovsGunman in ''Ex-Aid''; his true role in that series not being fully revealed until his show's endgame began.

*** Evolt could also be considered one to the Great Leader from the original Showa ''Series/KamenRider'' series. Both are supernatural forces behind evil organizations and nearly all of the problems faced by the heroes, but whereas the Great Leader was TheManBehindTheMan to all of the terrorist groups he started up and let his minions face the Kamen Riders while generally not do very much himself, Evolt is TheManInFrontOfTheMan who acts as a subordinate within each of the villainous factions he joins all while manipulating their leaders into unwittingly doing his bidding and is very proactive in engaging the heroes.
* TheCorrupter: Through his Pandora Box and its HatePlague, although with Nanba and Utsumi he didn't even need the Box. Evolt also feigns trying to corrupt Sento and Banjou [[SillyRabbitIdealismIsForKids by mocking their idealism]], but corrupting them isn't the goal; manipulating them by implying he ''wants'' to is.
* CrazyPrepared: Evolt put not one but ''two'' contingency plans to revive himself in place after he achieved his Phantom state, even though he believed himself to be invincible at the time.
* CreateYourOwnHero: When Takumi Katsuragi tried to stop Evolt before his plans went into motion, Evolt instead wiped his memories, changed his face and raised him (under the guise of Soichi Isurugi) into Sento Kiryu in order to use him as a pawn in his plans. It worked for most of the series, but then Sento ends up becoming one of the main factors standing between him and ultimate victory just when his plans start to reach their end. What's more, the Genius Bottle, a completely unexpected variable in Evolt's plans and a vital key to stopping him, turns out to be only usable by the kind of person he raised Sento into, a hero of justice.
* CruelMercy: If anything could be considered Evolt's FatalFlaw, it is his love of this trope. He could have opened the Pandora Box as early as episode 12 if he would just killed Nabeshima instead of wiping his memory with amnesia that turned out to be temporary. By episode 39 he came out victorious, completely and totally, but leaves the Riders and humanity as a whole alive when there is nothing that could stop him from killing them all because he wants to turn them into Lost Smash. This act of sadism allows the creation of the Genius [=FullBottle=], the first thing to be a serious threat to Evolt, and his response is to double down and leave Sento alive with the intent of crushing his hopes first. He tops himself in episode 45 by letting his sadism ruin an assured victory ''twice'' in one episode: first by killing Shinobu slowly so that he has time to give his son a final hint, and then by forcing Sento to watch him destroy a planet and then bringing him back to Earth instead of just dumping him out in deep space, which gives Sento time to have the realization that lets him undo Evolt's hard work.

* DeathByIrony: Evolt meets his end at the hands of the same person he molded into a hero — Sento.
* DemonicPossession: Until he gets the Evol Trigger back and active again, Evolt has to use others as host bodies. He spends most of the show in Soichi, then has brief tenures in both Banjou and Sento's bodies before he reclaims the Trigger and stops needing a host. Once he's used to being complete, he can send out chunks of himself to possess others at will, at the cost of not being able to use Black Hole Form unless he's all in one piece.

* EnemyMine: Assists Build and co. in fighting against his AxCrazy StrongerSibling Killbus. Cruel as he may be, Evolt at least has some sense of self-preservation while his brother just wants to destroy everything for fun.

* EvilCannotComprehendGood: Despite his complex knowledge of the human mind, Evolt has difficulty understanding why Banjou would be so fiercely protective of Sento even after learning the truth behind Katsuragi's attempt to murder him. Even if he doesn't understand it, though, he's willing to use it as a tool to manipulate Banjou.
* EvilerThanThou: Evolt proves to be this to ''every other villain'' with the possible exception of Bikaiser from the movie, from Night Rogue to Namba. Namba in particular gets a rude awakening when Evolt decides YouHaveOutlivedYourUsefulness and wipes his faction out in short order.

* EvilLuddite: If his rant towards Sento in episode 35 is to be taken at face value, Evolt believes that science making life more convenient leads to people taking things for granted and eventually getting wrapped up in war. Of course, given that he has spent the series trying to goad Sento into advancing technology for his own purposes, wants to anger Sento enough to raise his Hazard Level ever higher, and has gone out of his way to manipulate all sides into advancing warfare for his plans to wipe out all life, it’s best to take his lines with a grain of salt.
* EvilIsPetty: Evolt is this due to a combination of being both extremely narcissistic and incredibly vindictive. If his ego is bruised, he can't help but try to severely and sadistically punish anyone who bruises his ego. This is a FatalFlaw of his and his biggest weakness, as it comes at the cost of his pragmatism.

* EvilMentor: Because Evolt's schemes need both Banjou and Sento to have extremely high Hazard Levels, he plays a mentor figure whenever they need a push to move forward.

* TheEvilPrince: Since his brother is stated to be the "King" of the Blood Tribe, it could mean that Evolt has royal blood.
* TheFaceless: Evolt swaps between several faces over the course of the show, and when he reveals his own it's so alien that it takes a flashback to Evolt on his home planet to confirm that it even ''is'' his real face. Even after his identity is revealed, he commonly uses the form of Soichi like an untransformed state, although his real untransformed state is identical to his Fever Flow form.

---> '''Evolt:''' You think you can destroy me!? Like hell you will, '''you puny humans!'''

---> '''Evolt:''' So this...is the power of humanity...Then allow me to see this miracle you call the new world through till the end. Ciao...

** {{Wrath}}. Evolt ''cannot'' and ''will not'' tolerate having his ego bruised and will go to great lengths to make those who do so suffer...but in the process loses his pragmatism and gives his enemies openings to strike back.
* FauxAffablyEvil: Both before and after TheReveal of his identity, Evolt is a much more casual and friendly antagonist than Night Rogue, though underneath all of it he is a cruel being whose plan involves wiping out all life on earth. He is also happy to backstab even his own allies, and will even go so far as to reveal information or aid the heroes on occasion, but it is always in service of his own ends.

** Confirmed and [[DeconstructedTrope deconstructed]] as this attitude completely bites him in the ass time and time again. Evolt choosing to indulge his baser instincts over his [[TheChessmaster pragmatism]] results in him being put through the ringer more often than not. It ends up getting him killed in the long run.
* FromASingleCell: Episode 45 reveals that he can store a part of himself inside his Evol Driver which will eventually regenerate into a full body. Shinobu attempts to delay this by storing the Driver in a special container, but unfortunately, Evolt was smart enough to splinter off another segment which possessed Utsumi, rendering his effort moot. This is how Evolt managed to reappear in Build NEW WORLD: Cross-Z by planting a single cell into Banjou after being finished off by Build's [[EleventhHourSuperpower RabbitDragon]] [[FinishingMove Vortex Attack]] Notably, this ability seems unique to him out of the Blood Tribe, as every other member of his species are killed far easier, even the far stronger Killbas. Banjo's Blood Tribe DNA is the only other thing that has this level of regenerative ability, which came from Evolt himself.

* HazyFeelTurn: Leaves earth after Killbus is destroyed at the end of ''Cross-Z NEW WORLD'', but there is no indication as to if he actually changed or just waiting until later to destroy earth.

* HiddenAgendaVillain: Evolt manages to hide why exactly he wants Sento and Banjou to become stronger for most of the show, only making it clear when it is too late to stop him from taking their bodies.
* HumanoidAbomination: Possession by Evolt alters his host's physiology and gives them bizarre powers, to the point that they're stronger than the Blood Stalk suit ''on their own''. There is also the whole 'possessed by an evil, ancient alien entity' thing. Once he becomes complete, he still chooses to appear human, but frequently reminds the audience he's only pretending to be one.
* HumanityIsInfectious: His time among humanity, his frustration at Sento's delays to his plans, and the direct threat to his life that Build Genius represents eventually lead to Evolt switching from performative mimicry to genuine emotions. It is {{Deconstructed}} by actually making him an ''even more'' dangerous villain, because he can now process emotions like [[UnstoppableRage anger]] and '''''[[ForTheEvulz sadism]]'''''. On top of that, because he can now feel anger he can now ''raise his Hazard Level and become even stronger''. However, it also exacerbates his existing FatalFlaw by making his anger at Sento sufficient that just killing him won't be enough to satisfy Evolt's need for vengeance, which only gives Sento more time to chip away at Evolt's plans.

* INeedYouStronger: One of Evolt's many goals throughout the show is to raise Sento and Ryuga's Hazard Levels, as well as to raise Sento's technical knowledge of Driver creation to the point where he can repair the Evol Driver.

* InvincibleVillain: Early on he holds back his true power because he needs the heroes alive for his plans, so most of his loses are because [[ILetYouWin he wants them to win]]. It is only in the later half of the series that the heroes even begin to catch up to him. Unfortunately, it is also around this time that he gets back his Evol Driver and becomes Kamen Rider Evol, who outclasses all the heroes at the time of his debut, which he claims to only be a small percentage of his true power. Sure enough, every time it seems that the heroes are catching up to him, he manages to unlock more of his power and outclasses the heroes again. Ultimately subverted towards the end, however, as the heroes manage to catch up, something that begins to frustrate and enrage Evolt.

* KarmaHoudini: Despite all the deaths he caused and torment he inflicted on the heroes, Evolt survives the Cross-Z V-Cinema with his life intact and enough power to leave the Earth, an opportunity he immediately decides to take rather than pick another fight with Team Build. He doesn't have the Pandora Box anymore, and doesn't seem to have his world-shattering Black Hole or Fever Flow levels of power anymore either, [[TheBadGuyWins but otherwise Evolt comes out of the movie with pretty much everything he could have hoped for]].

* KnightOfCerebus: Once his true nature as Evolt is revealed, the plot goes from 'merely' the fate of Japan to the fate of the entire planet and eventually the entire ''universe''. He also manages to rack up one of the largest, if not ''the'' largest, onscreen body counts in the history of the franchise.
* LackOfEmpathy: When Yui questions Banjou why he wasn't able to save her students, Evolt (in Banjou's body) just says that he doesn't give a damn about them.
* LastOfHisKind: With the demise of the other three in the movie, Evolt is the last of the Blood Tribe. [[SubvertedTrope Subverted]] in the ''Kamen Rider Cross-Z'' V-Cinema where Evolt's [[StrongerSibling older brother]] Killbas comes to Earth sometime after Evolt's downfall. Played straight again after Killbas bites the dust.
* LesserOfTwoEvils: Compared to his brother Killbus, believe it or not. Evolt is a {{sadist}}ic PlanetEater, but he at least has a sense of self-preservation and can be reasoned with on some level, while Killbus is just AxCrazy and wants to destroy everything ForTheEvulz.

* LukeIAmYourFather: The alien that infected Ryuga's mother and thus turned him into a HalfHumanHybrid was a piece of Evolt, meaning in essence, Evolt is Ryuga's father. After Ryuga regenerates the DNA needed to transform when Evolt stole it, Evolt outright calls him his 'spawn'.

** The reveal of what he ''really'' is also makes it meaningful: Evolt is from a race of PlanetLooters called the Blood Tribe. Thus planets or species he comes across can be considered stock for the Blood Tribe.
** Evolt is a play on evolution and revolt. Evolt's plan involves tricking the heroes into evolving to higher levels, as well as rapidly transitioning through forms himself, and he ultimately revolts against ''everyone'' including the last three members of his own race other than himself. The other meaning for revolt is also apt, as he is irredeemably vile and either horrifies or enrages everyone who knows of him.

* ObviouslyEvil: Evolt makes no attempts in ''any'' of his identities to hide the fact that he is a supervillain.

* OneWingedAngel: Evolt goes through more of these than a ''Manga/DragonballZ'' villain. By the end, including Blood Stalk, he has ''eight'' forms, each progressively stronger than the last.
* OutsideGenreFoe: Until the reveal, the series had been primarily an AfterTheEnd story dealing with a Balkanized Japan and trying to stop a CivilWar from erupting. Then comes Evolt, an alien invader who sends the plot straight into CosmicHorrorStory territory and whose general character and powers are more in line with a shonen Anime BigBad than the typical Kamen Rider villain.
* PersonOfMassDestruction: Evolt is one of only two villains in Kamen Rider history to be a planet buster level power (the other being [[Series/KamenRiderKuuga N-Daguva-Zeba]], who was even with Kuuga's planet busting SuperMode), and has wiped out entire planets by himself. Over the course of the series, we actually see him eat an entire planet with a black hole, as well as Earth's moon.

* PlanetEater: It was initially believed that Evolt was from a race of PlanetLooters, but the truth turned out to be ''far worse.'' Evolt's primary goal on every planet he visits is to consume its resources and move on to the next at the cost of most of the energy he got to get to the next one. Part of the reason he didn't destroy Earth when he had every chance to was the Black Pandora Panel, which when completed enhances his power enough that not only could he warp to other planets without expending energy at all, he could also consume the ''entire planet'' instead of stripping it bare without the need for Pandora's Tower.

* PowerDyesYourHair: A side effect for some of those unfortunate to have his DNA. Sento's hair turned completely white when possessed, and in a world where Evolt didn't exist, Ryuga's hair was completely black instead of brown.

* RetGone: When he was defeated by Build in the finale, the merger of worlds erases him from at least Earth's history. Whether or not it means he is simply already dead and Pandora's Box destroyed without either coming to Earth or he was completely erased from time isn't clear, but as far as the merged Earth is concerned, Evolt never existed. [[SubvertedTrope Subverted HARD!]] as he managed to reappear into the New World in Build NEW WORLD: Cross-Z
* SanityHasAdvantages: Evolt is extremely manipulative, intelligent, and one of the most powerful villains in the history of the franchise...but he's also a raging malignant narcissist fundamentally incapable of taking the most minute of slights to his ego. Evolt repeatedly delays a certain victory in order to make those who bruised his ego suffer more or sate his sadism, and it bites him in the end. Hard.

* SmugSnake: Pun aside, Evolt is an incredibly accomplished fighter and he ''knows it.'' He even catches [=RabbitTank=]'s Vortex Finish in the palm of his hand, compliments the force of the blow, tosses Sento to the side and then remarks on the kick's Hazard Level without even coming close to losing his cool. The only things that can throw him off his game are Best Matches that he has never seen before, and even those usually [[ItOnlyWorksOnce only work once]]. Like most examples of the trope, the cracks in Evolt's master plan begin to form because he believes himself to be smarter than everyone else, and starts toying with his victims when he thinks he's won.
* SmugSuper: As Evolt achieves beyond the fourth phase of his powers, he backs it up by knowing that the heroes can't touch him. As Team Build rise and counterattack, it slowly bites him in the rear big time.

* SpellMyNameWithAnS: His name can also be spelled as "Evolto", as seen in a report in one episode. Official material for ''[[TheMovie Be The One]]'' shows that this was a mistake in romanization and the proper spelling is "Evolt".

* StoryBreakerPower: By the time he reaches his ultimate form, Evolt can destroy entire city blocks with the aftershocks of a casual kick and summon giant black holes that consume entire planets. Combined with his ability to instantly warp anywhere he desires in the universe with just a thought, Evolt is effectively one of, if not the most, powerful antagonists in Kamen Rider (his only real contenders are [[Series/KamenRiderGaim Rosyuo]], [[Series/KamenRiderAgito the Overlord of Darkness]], and, according to supporting information, [[Series/KamenRiderKuuga N-Daguva-Zeba]]). Removing the {{Macguffin}} from his chest aside, the only real reason he doesn't just kill everyone immediately is because he finds it more fun to watch them suffer.

* ThoseWereOnlyTheirScouts: Subverted. Vernage is shocked only one of his species was able to wipe out Mars, implying this trope, but when other members of his species appear, Evolt is shown to be considerably stronger than any of them (as well as being the only one with an Evol Driver) and they're subservient to him making it clear Evolt is an outlier. Only Kamen Rider Blood is comparable to him, and he requires a mismatch of Build Driver related items to achieve a form on par with the one Evolt ''naturally'' has. In addition, by present day, only five of the Blood Tribe are even left.

* TeethClenchedTeamwork: He partners up with Banjou in their battle against Killbus. While Evolt is eager to work together, Banjou is (justifiably) distrustful of him.
* TimeAbyss: Evolt is at the bare minimum millions of years old and older than life on Earth.

* UltimateEvil: For most of the series, Evolt has no physical form of his own and even once he is complete what he looks like under the armor is hidden. This is despite being one of the most vile and powerful villains in the entire franchise. He only gains an actual face at the end of the series, and unlike most examples more than lives up to it with how powerful and horrifying he is.
* VillainBall: Evolt could have won if he had just killed the other Kamen Riders as soon as he obtained the Black Pandora Panel, but he chose to keep them alive so he could watch them wallow in despair for longer. This provides an opportunity for Rogue to damage his Evol Trigger, buying Sento and Ryuga time to force the Panel out of him.

** He gets an absolutely ''beautiful'' one in episode 48 as Ryuga [[HeroicSacrifice carries him into the void between realities to finish fusing them into a world where the Skywall never existed,]] fruitlessly pounding his fists against Cross-Z Magma and shouting for him to stop. It continues into the episode after, with Evolt furious beyond measure that he's been foiled by the fake hero that ''he'' created. By the end of 49, he's ''still'' convinced he can win despite his power literally being hacked down and Sento delivering the trademark Rider Kick to finish him off, yelling there is no way he can lose until he is ultimately vaporized.
* VoluntaryShapeshifting: Upon becoming whole, Evolt can assume any form he chooses.

* WorldsStrongestMan: Evolt is, by far, the most powerful character in the main ''Kamen Rider Build'' series and one of the most powerful Riders in the franchise (among the riders his only direct competitors are Man of the Beginning Gaim, Post Series-Kamen Rider Decade, Ultimate Kuuga, Killbus and [=Cross-Z Evol=]. He's only unambiguously surpassed by Ohma Zi-O, who combines the powers of all Hesei riders and forms including Evol's). His Black Hole Form is capable of defeating any character in the series and allows him to wipe cities off the face of the planet in moments. Initially only Sento with his [[SuperMode Genius Form]] is capable of matching him but he quickly surpasses him by tapping into the Evol Driver's ability to use emotions for strength, becoming so powerful that Genius and Cross-Z Magma, who by the end of the series are comparative equals AND both stronger than Black Hole was initially, can ''just'' about slow him down for a few moments. His transformation after incorporating the Black Pandora Panel into himself is borderline invincible, capable of destroying planets in moments. It took the combined might of the other four Riders to fight him off the first time. The second time they needed to exploit a weakness from his Evol Trigger to keep him still and then send him to a pocket dimension to weaken him and it still took the deaths of two Riders and Ryuga sabotaging him from the inside to allow Sento to best him. Even then he manages to come back from THAT and recover his full power yet again. In the end the only way Evolt leaves is in his own terms. Essentially deciding that he doesn't want to destroy the Earth anymore.

** In Episode 34, he pulls a PoisonAndCureGambit on the heroes, offering Sento's life in exchange for the Pandora Box and all the remaining Fullbottles. However, this enrages Banjou, who fights so hard that he raises his Hazard Level to 5...which allows Evolt to [[DemonicPossession steal his body]], giving him even more than he wanted in the first place.

** His dealings with Faust, Hokuto, and Namba Industries was all in service of a delicate and lengthy plot to boost Banjou's Hazard Level so he could perform a FusionDance with him and regain all the DNA the other half of his being held. That accomplished, he has zero qualms about murdering Banjou otherwise.

[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/krbu_evolcobra_phase1_0.png]]
[[caption-width-right:200:''Are you Ready? Cobra! Cobra! Evol Cobra! Fuhahahahahahahaha!'']]
[[quoteright:180:https://static.tvtropes.org/pmwiki/pub/images/krbu_evoldragonform_phase2_7.png]]
[[caption-width-right:180:''Are you Ready? Dragon! Dragon! Evol Dragon! Fuhahahahahahahaha!'']]
[[quoteright:180:https://static.tvtropes.org/pmwiki/pub/images/krbu_evolrabbitform_phase3.png]]
[[caption-width-right:180:''Are you Ready? Rabbit! Rabbit! Evol Rabbit! Fuhahahahahahahaha!'']]
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/krbu_evolblackholeform_phase4perfection.png]]
[[caption-width-right:200:''Are you Ready? Black Hole! Black Hole! Black Hole! Revolution! Fuhahahahahahahaha!'']]

* AnimatedArmor: A variation. According to the data found about the Evol Driver, Kamen Rider Evol isn't so much a suit as much as his host [[OneWingedAngel physically transforming]] ''into'' Evolt.

* StrongAndSkilled: [[ContrastingSequelAntagonist Unlike the previous antagonist]] [[Series/KamenRiderExAid Dan Masamune,]] Evolt is not reliant on the overwhelming power of his transformations and can fight competently against any Rider with any of his weaker forms. While [[GrandTheftMe possessing Utsumi]], he managed to fight far more effectively as Mad Rogue than Utsumi himself could and was capable of killing Utsumi with his weakest form [=EvolCobra=] despite the fact that Utsumi also wielded an Evol Driver. Unlike Masamune, Evol has a properly honed fighting style that compliments his overwhelming power, which enables him to fight and hold the upper hand against Sento in his [[SuperMode Genius Form]]. [[UnskilledButStrong By contrast]], Masamune only held the upper hand as Kamen Rider Cronus due to his [[GameBreaker ability to stop time]] and was effortlessly beaten by Emu once he gained access to his [[SuperMode Hyper Muteki Form.]]

* ContrastingSequelAntagonist: Despite having a lot of similarities on the surface, Evolt/Kamen Rider Evol easily differs a lot from [[Characters/KamenRiderExAidOthers Masamune Dan/Kamen Rider Cronus]]:

* {{Catchphrase}}: "Ciao!"

** While being just as much FauxAffablyEvil, TheChessmaster, and an ArchnemesisDad as his predecessor, Evolt is presented as TheSlacker and a {{Troll}} when interacting with others, while Masamune made sure he came across as an [[VillainWithGoodPublicity respectable CEO]] at all times.

* SpellMyNameWithAnS: His name can also be spelled as "Evolto", as seen in a report in one episode. Official material for ''[[TheMovie Be The One]]'' shows that this was a mistake in romanization and the proper spelling is "Evolt". Both spellings are used by fans, however.

** To Shocker from the [[Series/KamenRider original series]], as both are terrorist organizations that create their monsters through capturing ordinary humans and conducting experimentation on them.

** The name becomes even ''more'' meaningful when it comes to light that [[spoiler: [[BigBad Evolt]] was directly behind the events that lead to its foundation, being the almost ''literal'' devil Faust's members unknowingly struck a deal with. Notice how he screws over every character that works with him: Gentoku, Katsuragi, and especially Namba...]]
* MechaMooks: Since all Guardians were created by the [[ManBehindTheMan Namba Corporation]], Faust's bankroller, Faust's generals can hijack any Guardians in the area to serve their own needs. They additionally have a set of Guardians that work for them full-time, distinguished by their broken faceplates and all-black clothing.

[[caption-width-right:192:''Mistmatch! Bat...Ba-Bat... Fire!'']]

A sinister figure behind the terrorist organization "Faust", and subsequently responsible for the experimentation that turns humans into Smash. A cold-blooded villain, he takes great pleasure in the suffering of his "guinea pigs".

For more information on their human identities as Gentoku Himuro and Nariaki Utsumi respectively, [[Characters/KamenRiderBuildToutoGovernment go here]].

* TheBadGuyWins: It would have been hard for episode 10 to go much better for Night Rogue than it did. Every single Full Bottle except Dragon and Lock falls into his possession, as well as the Pandora Box itself, and [[spoiler:his father suffering a heart attack]] earns him a promotion.

[[caption-width-right:219:''Mistmatch! Co-Cobra... Cobra... Fire!'']]

'''Warning: Due to the sheer number of spoilers associated with this character, all spoilers are left [[LateArrivalSpoiler un-marked.]] New viewers beware.'''

* AFormYouAreComfortableWith: After he completes the Evol Trigger, he no longer needs a host body and can shapeshift into anyone. He decides to default to the form of Soichi.

* AncientEvil: It is not clear exactly how old Evolt is, but he has been lying dormant ever since the destruction of the Martian civilization, meaning he is millions of years old at least, and Mars wasn't the first world he has destroyed.

* AxCrazy: And how! He takes his sadism to insane levels to the point that his fellow Blood Tribe members have becoming [[EvenEvilHasStandards fed up of it]].

* BigBad: Evolt is eventually outed as the true one of the show, standing above Faust, the three nations, and even Juzaburo Namba. All of the other factions, heroes and villains alike, dance to Evolt's tune as he goads and manipulates them to reach ever-greater heights of destruction in fighting one another, all for the sake of achieving the deadly purpose of the Pandora Box.

* BlessedWithSuck: The black Pandora Panel and Lost Bottles are secretly this. While having them makes Evoltable to warp between planets and consume their resources, their real function is to make him vulnerable to the white panel, which will use him as a LivingBattery to merge Build's wartorn universe with another one and undo Evolt's reign of terror.

* BodySurf: Evolt first possessed Soichi on Mars, then surfed into Ryuga after he hit Hazard Level 5. Then he did the same to Sento when he reached Hazard Level 6.

* ContrastingSequelAntagonist: Despite having a lot of similarities on the surface, Evolt/Kamen Rider Evol easily differs a lot from [[Characters/KamenRiderExAidOthers Masamune Dan/Kamen Rider Cronus:]]
** While being just as much FauxAffablyEvil, TheChessmaster, and an ArchnemesisDad as his predecessor, Evolt is presented as TheSlacker and a {{Troll}} when interacting with others, while Masamune made sure he came across as an [[CorruptCorporateExecutive respectable CEO]] at all times.
** Both are [[ManipulativeBastard Manipulative Bastards]] who managed to get practically all of the central characters in their respective story [[UnwittingPawn to unknowingly do their bidding in one form or another]] and waited until around the final stretch of their respective series to fully take up the position of the BigBad. But whereas Evolt in ''Build'' is firmly TheManInFrontOfTheMan from the very beginning as a major character, Masamune was TheManBehindTheMan who started out as a relatively minor character in ''Ex-Aid''; his true role in that series not being fully revealed until his show's endgame begun.
** In regards to Rider powers, Kamen Rider Evol is an [[AncientEvil alien horror]] whose central abilities revolve around [[SpaceMaster black holes and space traveling]], which greatly differs from Kamen Rider Cronus, who was an amoral human being that had [[TimeMaster the power to stop and even rewind time.]]
*** Evolt could also be considered one to the [[Series/KamenRider Great Leader]] from the Showa ''Kamen Rider'' series. Both are supernatural forces behind evil organizations and nearly all of the problems faced by the heroes, but whereas the Great Leader was TheManBehindTheMan to all of the terrorist groups he started up and let his minions face the Kamen Riders while generally not do very much himself, Evolt is TheManInFrontOfTheMan who acts as a subordinate within each of the villainous factions he joins all while manipulating their leaders into unwittingly doing his bidding and is very proactive in engaging the heroes.

* DeaderThanDead: His final fate: he is not only killed but the merger of worlds means he is effectively been erased from existence. Except until he regenerates from the DNA he placed in Ryuga Banjou.

** The ''ROGUE'' mini-series reveals that he was this with Gentoku and, to a lesser extent, Takumi Katsuragi as well. [[UnreliableNarrator Ostensibly under the orders of Namba Heavy Industries,]] he stoked Gentoku's then fairly dormant [[HatePlague influence from the Pandora Box]], helping to turn him into the egotistical madman he was by the first episode and gave Katsuragi the necessary data on Nebula Gas to produce a stable Smash transformation, both of which directly led to the founding of Faust.
* EvilPrince: Since his brother is stated to be the "King" of the Blood Tribe, it could mean that Evolt has royal blood.

---> '''Evolt:''' So this...is the power of humanity... Then allow me to see this miracle you call the new world through till the end. Ciao...

* HumanityIsInfectious: His time among humanity, his frustration at Sento's delays to his plans, and the direct threat to his life that Build Genius represents eventually lead to Evolt switching from performative mimicry to genuine emotions. It is {{Deconstructed}} by actually making him an ''even more'' dangerous villain, because he can now process emotions like [[UnstoppableRage anger]] and '''''[[ForTheEvulz sadism.]]''''' On top of that, because he can now feel anger he can now ''[[OhCrap raise his Hazard Level and become even stronger.]]'' However, it also exacerbates his existing FatalFlaw by making his anger at Sento sufficient that just killing him won't be enough to satisfy Evolt's need for vengeance, which only gives Sento more time to chip away at Evolt's plans.
* ImpaledWithExtremePrejudice: Vernage defeated him in her LastStand against him by running him through the Evol Driver with a energy {{BFS}}.

** KarmaHoudiniWarranty: [[spoiler: That said, he does achieve a new final form in the Final Stage stageshow, which takes place after the finale, and uses it to fight Team Build one more time. They tear him apart, this time forever.]]
* KarmicDeath: Ultimately meets his end at the hands of the person he manipulated for his own ends and psychologically tortured throughout the series along with his son who he abused and manipulated the entire series. To add to the karma, the very weapon he used to cause so much misery, the Pandora's Box, is turned against him via the white panel and used as the instrument of his demise.

* SealedEvilInACan: Vernage defeated him and crippled his Evol Driver, leaving him weakened and unable to escape Mars, stranding him on the planet he destroyed for millions of years until [[DugTooDeep the Mars expedition accidentally gave him a way to escape.]]
* SenseFreak: It turns out that up until Sento nearly killed him in Genius Form he had never properly experienced emotions, describing his previous happiness, pain, anger and shock as "performative mimicry". After Genius Form forced him to drop his transformation and nearly killed him however he's started to feel emotions himself and he describes it as "[[HumanityIsInfectious the most fun I've ever had".]]

* TheFightingNarcissist: It eventually becomes apparent that Evolt has an ''incredibly'' high opinion of himself as a 'higher organism'. The biggest symptom of this trope is his BerserkButton: he simply ''can't'' tolerate having his ego bruised and will go to extreme, spiteful lengths to make those who have done so suffer.

* TooKinkyToTorture: He seems to enjoy the beatings he takes from from both Build and Cross-Z, treating them as demonstrations of their increasing Hazard Levels. Subverted once he receives a beating that actually ''hinders'' his plans, [[BerserkButton which he absolutely despises.]]

* WorldsStrongestMan: Evolt is, by far, the most powerful character in the main ''Kamen Rider Build'' series and one of the most powerful Riders in the franchise (amongst the riders his only direct competitors are Man of the Beginning Gaim, Post Series-Kamen Rider Decade, Ultimate Kuuga, Killbus and [=Cross-Z Evol=]. He's only unambiguously surpassed by Ohma Zi-O, who combines the powers of all Hesei riders and forms including Evol's). His Black Hole Form is capable of defeating any character in the series and allows him to wipe cities off the face of the planet in moments. Initially only Sento with his [[SuperMode Genius Form]] is capable of matching him but he quickly surpasses him by tapping into the Evol Driver's ability to use emotions for strength, becoming so powerful that Genius and Cross-Z Magma, who by the end of the series are comparative equals AND both stronger than Black Hole was initially, can ''just'' about slow him down for a few moments. His transformation after incorporating the Black Pandora Panel into himself is borderline invincible, capable of destroying planets in moments. It took the combined might of the other four Riders to fight him off the first time. The second time they needed to exploit a weakness from his Evol Trigger to keep him still and then send him to a pocket dimension to weaken him and it still took the deaths of two Riders and Ryuga sabotaging him from the inside to allow Sento to best him. Even then he manages to come back from THAT and recover his full power yet again. In the end the only way Evolt leaves is in his own terms. Essentially deciding that he doesn't want to destroy the Earth anymore.
* WouldHurtAChild: Stalk opts to demonstrate his Steam Blade's ability to create Smash on the go by using it on a boy no older than ten. And of course, there is the fact that children are among the humans living on the planet that he intends to destroy for funsies.

** In Episode 34, he pulls a PoisonAndCureGambit on the heroes, offering Sento's life in exchange for the Pandora Box and all the remaining Fullbottles. However, this enrages Banjou, who fights so hard that he raises his Hazard Level to 5… which allows Evolt to [[DemonicPossession steal his body]], giving him even more than he wanted in the first place.

* ScarfOfAsskicking: He wears a muffler made from... car mufflers.

* SdrawkcabName: His name Rider name is love spelled backwards (it's even stated as such in his theme song) fitting since he's the antithesis to the rider's beliefs of fighting for LOVE and peace.

* AnimalMotif: Hedgehog.

* AnimalMotif: Gorilla.
* BackForTheDead: [[spoiler: Returns after Forty episodes after it was revealed that he was one of Shinobu Katsuragi's students. However, after losing as the Stag Lost Smash, he is killed by Evolt.]]

* AnimalMotif: Dragons, though it's not immediately apparent. The protrusions on her sides resemble dragon horns, her element is often associated with dragons breathing fire, and it's the [=FullBottle=] that her essence creates.

* AnimalMotif: Hawk.

* AnimalMotif: Panda, though, it's extremely subtle, even when compared to the Burn Smash. He's mostly shades of black and white, his face resembles that of an upside-down panda, it's the motif of the [=FullBottle=] his essence makes, and he's built extremely bulky, much like real-life adult pandas.

* AnimalMotif: Jellyfish.

* AnimalMotif: Gorilla.

* AnimalMotif: Panda.

* AnimalMotif: Octopus. It has the ability to use a barrage of energy tendrils and tentacles.

* AnimalMotif: Octopus.

* AnimalMotif: Hawk.

* BigBadDuumvirate: With Juzaburo Namba, who's providing funding to Faust. They have different ends, but the same means: starting a war between the three factions of Japan. Night Rogue wants Touto to emerge triumphant from the resulting conflict he feels is inevitable, while Juzaburo is simply a war profiteer seeking to make money on weapons deals from it. However, gradually [[EvilVsEvil they start to separate and begin opposing each other.]]

* SpellMyNameWithAnS: His name can also be spelled as "Evolto", as seen in a report in one episode. Official material for ''[[TheMovie Be The One]]'' shows that this was a mistake in romanization and the proper spelling is "Evolt".

** The name becomes even ''more'' meaningful when it comes to light that [[spoiler: [[BigBad Evolt]] was directly behind the events that lead to its foundation, being the almost ''literal'' devil Faust's members unknowingly struck a deal with.]]

* WorldsStrongestMan: Evolt is, by far, the most powerful character in the main ''Kamen Rider Build'' series and of the most powerful Riders in the franchise (amongst the riders his only direct competitors are Man of the Beginning Gaim, Post Series-Kamen Rider Decade, Ultimate Kuuga, Killbus and [=Cross-Z Evol=]. He's only unambiguously surpassed by Ohma Zi-O, who combines the powers of all Hesei riders and forms including Evol's). His Black Hole Form is capable of defeating any character in the series and allows him to wipe cities off the face of the planet in moments. Initially only Sento with his [[SuperMode Genius Form]] is capable of matching him but he quickly surpasses him by tapping into the Evol Driver's ability to use emotions for strength, becoming so powerful that Genius and Cross-Z Magma, who by the end of the series are comparative equals AND both stronger than Black Hole was initially, can ''just'' about slow him down for a few moments. His transformation after incorporating the Black Pandora Panel into himself is borderline invincible, capable of destroying planets in moments. It took the combined might of the other four Riders to fight him off the first time. The second time they needed to exploit a weakness from his Evol Trigger to keep him still and then send him to a pocket dimension to weaken him and it still took the deaths of two Riders and Ryuga sabotaging him from the inside to allow Sento to best him. Even then he manages to come back from THAT and recover his full power yet again. In the end the only way Evolt leaves is in his own terms. Essentially deciding that he doesn't want to destroy the Earth anymore.

* SpellMyNameWithAnS: His name can also be spelled as "Evolto", as seen in a report in one episode.

[[caption-width-right:200:''Cobra! Cobra! Evol Cobra! Fuhahahahahahahaha!'']]

[[caption-width-right:180:''Dragon! Dragon! Evol Dragon! Fuhahahahahahahaha!'']]

[[caption-width-right:180:''Rabbit! Rabbit! Evol Rabbit! Fuhahahahahahahaha!'']]

[[caption-width-right:200:''Black Hole! Black Hole! Black Hole! Revolution! Fuhahahahahahahaha!'']]

** Both are [[ManipulativeBastard Manipulative Bastards]] who managed to get practically all of the central characters in their respective story [[UnwittingPawn to unknowingly do their bidding in one form or another]] and waited until around the final stretch of their respective series to fully take up the position of the BigBad. But whereas Evolt in ''Build'' is firmly TheManInFrontOfTheMan from the very beginning as a major character, Masamune was TheManBehindTheMan who started out as a relatively minor character in ''Ex-Aid''; his true role in the that series not being fully revealed until his show's endgame begun.

[[quoteright:180:https://static.tvtropes.org/pmwiki/pub/images/krbu_evolcobra_phase1_0.png]]
[[caption-width-right:180:''Cobra! Cobra! Evol Cobra! Fuhahahahahahahaha!'']]

[[quoteright:180:https://static.tvtropes.org/pmwiki/pub/images/krbu_evolblackholeform_phase4perfection.png]]
[[caption-width-right:180:''Black Hole! Black Hole! Black Hole! Revolution! Fuhahahahahahahaha!'']]

[[caption-width-right:219:[[labelnote:Click here to see Evolt's true form]]https://static.tvtropes.org/pmwiki/pub/images/evolt.png[[/labelnote]]]]

* FromASingleCell: Episode 45 reveals that he can store a part of himself inside his Evol Driver which will eventually regenerate into a full body. Shinobu attempts to delay this by storing the Driver in a special container, but unfortunately, Evolt was smart enough to splinter off another segment which possessed Utsumi, rendering his effort moot. This is how Evolt managed to reappear in Build NEW WORLD: Cross-Z by planting a single cell into Banjou after being finished off by Build's [[EleventhHourSuperpower RabbitDragon]] [[FinishingMove Vortex Attack]]

* WorldsStrongestMan: Evolt is, by far, the most powerful character in the main ''Kamen Rider Build'' series and quite possibly the franchise (amongst the riders his only real competitors are Man of the Beginning Gaim, Post Series-Kamen Rider Decade, Ultimate Kuuga, Killbus and [=Cross-Z Evol=]). His Black Hole Form is capable of defeating any character in the series and allows him to wipe cities off the face of the planet in moments. Initially only Sento with his [[SuperMode Genius Form]] is capable of matching him but he quickly surpasses him by tapping into the Evol Driver's ability to use emotions for strength, becoming so powerful that Genius and Cross-Z Magma, who by the end of the series are comparative equals AND both stronger than Black Hole was initially, can ''just'' about slow him down for a few moments. His transformation after incorporating the Black Pandora Panel into himself is borderline invincible, capable of destroying planets in moments. It took the combined might of the other four Riders to fight him off the first time. The second time they needed to exploit a weakness from his Evol Trigger to keep him still and then send him to a pocket dimension to weaken him and it still took the deaths of two Riders and Ryuga sabotaging him from the inside to allow Sento to best him. Even then he manages to come back from THAT and recover his full power yet again. In the end the only way Evolt leaves is in his own terms. Essentially deciding that he doesn't want to destroy the Earth anymore.

* ContrastingSequelAntagonist: Despite having a lot of similarities on the surface, Evolt/Kamen Rider Evol easily differs a lot from [[Characters/KamenRiderExAidOthers Masamune Dan/Kamen Rider Cronus.]]

!!!Tropes exclusive to him as Kamen Rider Evol:[[quoteright:180:https://static.tvtropes.org/pmwiki/pub/images/krbu_evolcobra_phase1_0.png]]

!!!Tropes exclusive to him as Kamen Rider Evol:[[quoteright:278:https://static.tvtropes.org/pmwiki/pub/images/krbu_evolcobra_phase1_0.png]]
[[caption-width-right:278:Evol Cobra Form (Phase 1)]]
[[caption-width-right:251:[[labelnote:Click here to see Evol Dragon form (Phase 2)]]https://static.tvtropes.org/pmwiki/pub/images/krbu_evoldragonform_phase2_7.png[[/labelnote]]]]
[[caption-width-right:251:[[labelnote:Click here to see Evol Rabbit form (Phase 3)]]https://static.tvtropes.org/pmwiki/pub/images/krbu_evolrabbitform_phase3.png[[/labelnote]]]]
[[caption-width-right:251:[[labelnote:Click here to see Evol Black hole form (Phase 4]]https://static.tvtropes.org/pmwiki/pub/images/krbu_evolblackholeform_phase4perfection.png[[/labelnote]]]]

!!Evolto / Blood Stalk / Kamen Rider Evol

[[caption-width-right:219:[[labelnote:Click here to see Evolto's true form]]https://static.tvtropes.org/pmwiki/pub/images/evolt.png[[/labelnote]]]]

In truth, Stalk is just another name for Evolto, an extraterresial lifeform from a distant star that came to Mars with the Pandora Box and used its power to turn the once-green planet into a lifeless wasteland before being defeated in a final duel with the Martian queen Vernage, who destroyed his Evol Driver and left him a helpless mass of sludge. Evolto lay dormant for untold millions of years before an unmanned probe from Earth arrived to the red planet, prompting Evolto to send part of his being along with the probe on its return. The rest of him infected the astronaut that came to Mars next, [[Characters/KamenRiderBuildProtagonists Souichi Isurugi]], taking over his body to use as Evolt's new host as he planned to reclaim his lost half, rebuild his shattered Driver, and bring about the destruction of Earth.

* TwentyFourHourArmor: Unlike Night Rogue, who seems to only wear his armor when needed, Evolto prefers to wear the Blood Stalk armor at all times whenever he is around other villains, to the point it is implied even members of Faust have no idea who he is under the mask. He eventually becomes more lax about this policy after his identity comes out, but still prefers wearing the suit nearly all of the time.

* AliensAreBastards: His true identity as Evolto is an alien whose idea of fun is [[OmnicidalManiac destroying all life on planets]] and who spends most of the show possessing an innocent man to make him do horrible things while [[AndIMustScream fully conscious of everything]].
* AncientEvil: It is not clear exactly how old Evolto is, but he has been lying dormant ever since the destruction of the Martian civilization, meaning he is millions of years old at least, and Mars wasn't the first world he has destroyed.
* ArchnemesisDad: As it turns out, the alien that accidentally sired Ryuga was a piece of Evolto, effectively making him Evolt's son, which Evolto eventually acknowledges. This doesn't make Evolto any kinder to him than anyone else and he repeatedly tries to murder him.

* BackFromTheDead: In the Cross-Z V Cinema, Evolto manages to recover from being sacrificed for the New World by attaching a piece of himself to Ryuga which he could regenerate from if it ever came into contact with Pandora's Box.
* BecomingTheMask: Subverted: Stalk's voice changer is initially used to obscure his identity, but after the first reveal about his identity he continues to use it while wearing the suit, unlike almost every other case of a voice changer-using character in the franchise. The second reveal comes with the WhamLine that shows the deeper voice is Evolto's ''actual'' voice, and he was never using the voice changer at all. It is played with some more when even after acquiring his own body, Evolto prefers Soichi's shape, and even mimics his voice while in that form, but this changes nothing about his personality.

** His plans being derailed. Evolto is very cunning and often in control, but the moment something unexpected throws a wrench in his works and sets them back, Evolto does ''not'' take it well.
** A 'lesser lifeform' defeating him is another thing Evolto cannot stand and any genuine loss to an 'inferior' opponent will royally tick him off.
* BigBad: Evolto is eventually outed as the true one of the show, standing above Faust, the three nations, and even Juzaburo Namba. All of the other factions, heroes and villains alike, dance to Evolto's tune as he goads and manipulates them to reach ever-greater heights of destruction in fighting one another, all for the sake of achieving the deadly purpose of the Pandora Box.
* BishonenLine: By his race's standards. It's eventually revealed in the Cross-Z V-Cinema that Evolto's final form is simply himself as he appeared on his home planet, just wearing the Evol Driver. It's the equivalent to if Build's final form was just Sento wearing the Build Driver.
* BizarreAlienBiology: Evolto is a very strange organism to say the least, with biology like nothing on Earth and having more in common with a BlobMonster than anything else. This is a problem, as his venom is so unlike anything on Earth that it is impossible to cure.
* BlessedWithSuck: The black Pandora Panel and Lost Bottles are secretly this. While having them makes Evolto able to warp between planets and consume their resources, their real function is to make him vulnerable to the white panel, which will use him as a LivingBattery to merge Build's wartorn universe with another one and undo Evolto's reign of terror.
* BlobMonster: Evolto's true nature has shades of this, as his shape-shifting gives the impression of him becoming a mass of liquid and rearranging himself and the parts he separates from his main body assume the form of small blobs of material.
* BodySurf: Evolto first possessed Soichi on Mars, then surfed into Ryuga after he hit Hazard Level 5. Then he did the same to Sento when he reached Hazard Level 6.

* CainAndAbel: Evolto and Killbas don't get along. Both want to wipe out everything in the universe but Evolto wants leave himself alive while Kilbas just wants to destroy everything including himself, which ironically makes Evolto the ''Abel'' to Killbas' Cain.

* TheChessmaster: He refers to himself as a game master in episode 4. Despite his apparent laziness, everything he does is part of a carefully laid strategy, so much so that almost everything that happens in the first quarter of the series is one gigantic scheme of Evolto's coming to fruition, and ''that'' scheme is just the first step of his far grander one.

* ContrastingSequelAntagonist: Despite having a lot of similarities on the surface, Evolto/Kamen Rider Evol easily differs a lot from [[Characters/KamenRiderExAidOthers Masamune Dan/Kamen Rider Cronus.]]
** While being just as much FauxAffablyEvil, TheChessmaster, and an ArchnemesisDad as his predecessor, Evolto is presented as TheSlacker and a {{Troll}} when interacting with others, while Masamune made sure he came across as an [[CorruptCorporateExecutive respectable CEO]] at all times.

*** Evolto could also be considered one to the [[Series/KamenRider Great Leader]] from the Showa ''Kamen Rider'' series. Both are supernatural forces behind evil organizations and nearly all of the problems faced by the heroes, but whereas the Great Leader was TheManBehindTheMan to all of the terrorist groups he started up and let his minions face the Kamen Riders while generally not do very much himself, Evolto is TheManInFrontOfTheMan who acts as a subordinate within each of the villainous factions he joins all while manipulating their leaders into unwittingly doing his bidding and is very proactive in engaging the heroes.

* CrazyPrepared: Evolto put not one but ''two'' contingency plans to revive himself in place after he achieved his Phantom state, even though he believed himself to be invincible at the time.
* CreateYourOwnHero: When Takumi Katsuragi tried to stop Evolto before his plans went into motion, Evolt instead wiped his memories, changed his face and raised him (under the guise of Soichi Isurugi) into Sento Kiryu in order to use him as a pawn in his plans. It worked for most of the series, but then Sento ends up becoming one of the main factors standing between him and ultimate victory just when his plans start to reach their end. What's more, the Genius Bottle, a completely unexpected variable in Evolto's plans and a vital key to stopping him, turns out to be only usable by the kind of person he raised Sento into, a hero of justice.
* CruelMercy: If anything could be considered Evolto's FatalFlaw, it is his love of this trope. He could have opened the Pandora Box as early as episode 12 if he would just killed Nabeshima instead of wiping his memory with amnesia that turned out to be temporary. By episode 39 he came out victorious, completely and totally, but leaves the Riders and humanity as a whole alive when there is nothing that could stop him from killing them all because he wants to turn them into Lost Smash. This act of sadism allows the creation of the Genius [=FullBottle=], the first thing to be a serious threat to Evolto, and his response is to double down and leave Sento alive with the intent of crushing his hopes first. He tops himself in episode 45 by letting his sadism ruin an assured victory ''twice'' in one episode: first by killing Shinobu slowly so that he has time to give his son a final hint, and then by forcing Sento to watch him destroy a planet and then bringing him back to Earth instead of just dumping him out in deep space, which gives Sento time to have the realization that lets him undo Evolto's hard work.

* DeathByIrony: Evolto meets his end at the hands of the same person he molded into a hero — Sento.

* DragonWithAnAgenda: Evolto lets each of the other villains take turns as the major threat while he plays their dragon, all the while advancing his own goals instead of theirs. The moment he's complete, he ends the facade brutally and effectively.

* EvilCannotComprehendGood: Despite his complex knowledge of the human mind, Evolto has difficulty understanding why Banjou would be so fiercely protective of Sento even after learning the truth behind Katsuragi's attempt to murder him. Even if he doesn't understand it, though, he's willing to use it as a tool to manipulate Banjou.
* EvilerThanThou: Evolto proves to be this to ''every other villain'' with the possible exception of Bikaiser from the movie, from Night Rogue to Namba. Namba in particular gets a rude awakening when Evolto decides YouHaveOutlivedYourUsefulness and wipes his faction out in short order.

* EvilLuddite: If his rant towards Sento in episode 35 is to be taken at face value, Evolto believes that science making life more convenient leads to people taking things for granted and eventually getting wrapped up in war. Of course, given that he has spent the series trying to goad Sento into advancing technology for his own purposes, wants to anger Sento enough to raise his Hazard Level ever higher, and has gone out of his way to manipulate all sides into advancing warfare for his plans to wipe out all life, it’s best to take his lines with a grain of salt.
* EvilIsPetty: Evolto is this due to a combination of being both extremely narcissistic and incredibly vindictive. If his ego is bruised, he can't help but try to severely and sadistically punish anyone who bruises his ego. This is a FatalFlaw of his and his biggest weakness, as it comes at the cost of his pragmatism.

* EvilMentor: Because Evolto's schemes need both Banjou and Sento to have extremely high Hazard Levels, he plays a mentor figure whenever they need a push to move forward.

* EvilPrince: Since his brother is stated to be the "King" of the Blood Tribe, it could mean that Evolto has royal blood.
* TheFaceless: Evolto swaps between several faces over the course of the show, and when he reveals his own it's so alien that it takes a flashback to Evolt on his home planet to confirm that it even ''is'' his real face. Even after his identity is revealed, he commonly uses the form of Soichi like an untransformed state, although his real untransformed state is identical to his Fever Flow form.
* FakeDefector: During the fight with Killbus in the Cross-Z V-Cinema, Evolto pretended to betray the heroes and attack Yui in order to get Ryuga angry so his Hazard Level would be raised to the point where he could use the Muscle Galaxy Fullbottle.

---> '''Evolto:''' You think you can destroy me!? Like hell you will, '''you puny humans!'''

---> '''Evolto:''' So this...is the power of humanity... Then allow me to see this miracle you call the new world through till the end. Ciao...

** {{Wrath}}. Evolto ''cannot'' and ''will not'' tolerate having his ego bruised and will go to great lengths to make those who do so suffer...but in the process loses his pragmatism and gives his enemies openings to strike back.
* FauxAffablyEvil: Both before and after TheReveal of his identity, Evolto is a much more casual and friendly antagonist than Night Rogue, though underneath all of it he is a cruel being whose plan involves wiping out all life on earth. He is also happy to backstab even his own allies, and will even go so far as to reveal information or aid the heroes on occasion, but it is always in service of his own ends.

** Confirmed and [[DeconstructedTrope deconstructed]] as this attitude completely bites him in the ass time and time again. Evolto choosing to indulge his baser instincts over his [[TheChessmaster pragmatism]] results in him being put through the ringer more often than not. It ends up getting him killed in the long run.
* FromASingleCell: Episode 45 reveals that he can store a part of himself inside his Evol Driver which will eventually regenerate into a full body. Shinobu attempts to delay this by storing the Driver in a special container, but unfortunately, Evolto was smart enough to splinter off another segment which possessed Utsumi, rendering his effort moot. This is how Evolto managed to reappear in Build NEW WORLD: Cross-Z by planting a single cell into Banjou after being finished off by Build's [[EleventhHourSuperpower RabbitDragon]] [[FinishingMove Vortex Attack]]

* HiddenAgendaVillain: Evolto manages to hide why exactly he wants Sento and Banjou to become stronger for most of the show, only making it clear when it is too late to stop him from taking their bodies.
* HumanoidAbomination: Possession by Evolto alters his host's physiology and gives them bizarre powers, to the point that they're stronger than the Blood Stalk suit ''on their own''. There is also the whole 'possessed by an evil, ancient alien entity' thing. Once he becomes complete, he still chooses to appear human, but frequently reminds the audience he's only pretending to be one.
* HumanityIsInfectious: His time among humanity, his frustration at Sento's delays to his plans, and the direct threat to his life that Build Genius represents eventually lead to Evolto switching from performative mimicry to genuine emotions. It is {{Deconstructed}} by actually making him an ''even more'' dangerous villain, because he can now process emotions like [[UnstoppableRage anger]] and '''''[[ForTheEvulz sadism.]]''''' On top of that, because he can now feel anger he can now ''[[OhCrap raise his Hazard Level and become even stronger.]]'' However, it also exacerbates his existing FatalFlaw by making his anger at Sento sufficient that just killing him won't be enough to satisfy Evolt's need for vengeance, which only gives Sento more time to chip away at Evolto's plans.

* INeedYouStronger: One of Evolto's many goals throughout the show is to raise Sento and Ryuga's Hazard Levels, as well as to raise Sento's technical knowledge of Driver creation to the point where he can repair the Evol Driver.

* InvincibleVillain: Early on he holds back his true power because he needs the heroes alive for his plans, so most of his loses are because [[ILetYouWin he wants them to win]]. It is only in the later half of the series that the heroes even begin to catch up to him. Unfortunately, it is also around this time that he gets back his Evol Driver and becomes Kamen Rider Evol, who outclasses all the heroes at the time of his debut, which he claims to only be a small percentage of his true power. Sure enough, every time it seems that the heroes are catching up to him, he manages to unlock more of his power and outclasses the heroes again. Ultimately subverted towards the end, however, as the heroes manage to catch up, something that begins to frustrate and enrage Evolto.

* KarmaHoudini: Despite all the deaths he caused and torment he inflicted on the heroes, Evolto survives the Cross-Z V-Cinema with his life intact and enough power to leave the Earth, an opportunity he immediately decides to take rather than pick another fight with Team Build. He doesn't have the Pandora Box anymore, and doesn't seem to have his world-shattering Black Hole or Fever Flow levels of power anymore either, [[TheBadGuyWins but otherwise Evolto comes out of the movie with pretty much everything he could have hoped for]].

* KnightOfCerebus: Once his true nature as Evolto is revealed, the plot goes from 'merely' the fate of Japan to the fate of the entire planet and eventually the entire ''universe''. He also manages to rack up one of the largest, if not ''the'' largest, onscreen body counts in the history of the franchise.
* LackOfEmpathy: When Yui questions Banjou why he wasn't able to save her students, Evolto (in Banjou's body) just says that he doesn't give a damn about them.
* LastOfHisKind: With the demise of the other three in the movie, Evolto is the last of the Blood Tribe. [[SubvertedTrope Subverted]] in the ''Kamen Rider Cross-Z'' V-Cinema where Evolto's [[StrongerSibling older brother]] Killbas comes to Earth sometime after Evolto's downfall. Played straight again after Killbas bites the dust.
* LesserOfTwoEvils: Compared to his brother Killbus, believe it or not. Evolto is a {{sadist}}ic PlanetEater, but he at least has a sense of self-preservation and can be reasoned with on some level, while Killbus is just AxCrazy and wants to destroy everything ForTheEvulz.
* LogicalWeakness: The Evol Trigger makes him immensely powerful, but it also acts as his biggest weakness. Damaging it causes it to malfunction, which results in paralyzing Evolto, even in his monster form.
* LukeIAmYourFather: The alien that infected Ryuga's mother and thus turned him into a HalfHumanHybrid was a piece of Evolt, meaning in essence, Evolto is Ryuga's father. After Ryuga regenerates the DNA needed to transform when Evolto stole it, Evolto outright calls him his 'spawn'.

** The reveal of what he ''really'' is also makes it meaningful: Evolto is from a race of PlanetLooters called the Blood Tribe. Thus planets or species he comes across can be considered stock for the Blood Tribe.
** Evolt is a play on evolution and revolt. Evolto's plan involves tricking the heroes into evolving to higher levels, as well as rapidly transitioning through forms himself, and he ultimately revolts against ''everyone'' including the last three members of his own race other than himself. The other meaning for revolt is also apt, as he is irredeemably vile and either horrifies or enrages everyone who knows of him.

* ObviouslyEvil: Evolto makes no attempts in ''any'' of his identities to hide the fact that he is a supervillain.

* OneWingedAngel: Evolto goes through more of these than a ''Manga/DragonballZ'' villain. By the end, including Blood Stalk, he has ''eight'' forms, each progressively stronger than the last.
* OutsideGenreFoe: Until the reveal, the series had been primarily an AfterTheEnd story dealing with a Balkanized Japan and trying to stop a CivilWar from erupting. Then comes Evolto, an alien invader who sends the plot straight into CosmicHorrorStory territory and whose general character and powers are more in line with a shonen Anime BigBad than the typical Kamen Rider villain.
* PersonOfMassDestruction: Evolto is one of only two villains in Kamen Rider history to be a planet buster level power (the other being [[Series/KamenRiderKuuga N-Daguva-Zeba]], who was even with Kuuga's planet busting SuperMode), and has wiped out entire planets by himself. Over the course of the series, we actually see him eat an entire planet with a black hole, as well as Earth's moon.

* PlanetEater: It was initially believed that Evolto was from a race of PlanetLooters, but the truth turned out to be ''far worse.'' Evolto's primary goal on every planet he visits is to consume its resources and move on to the next at the cost of most of the energy he got to get to the next one. Part of the reason he didn't destroy Earth when he had every chance to was the Black Pandora Panel, which when completed enhances his power enough that not only could he warp to other planets without expending energy at all, he could also consume the ''entire planet'' instead of stripping it bare without the need for Pandora's Tower.

* PoisonousPerson: Evolto is naturally venomous. As it is an extraterrestrial venom, he is the only one who can cure it.
* PowerDyesYourHair: A side effect for some of those unfortunate to have his DNA. Sento's hair turned completely white when possessed, and in a world where Evolto didn't exist, Ryuga's hair was completely black instead of brown.

* RetGone: When he was defeated by Build in the finale, the merger of worlds erases him from at least Earth's history. Whether or not it means he is simply already dead and Pandora's Box destroyed without either coming to Earth or he was completely erased from time isn't clear, but as far as the merged Earth is concerned, Evolto never existed. [[SubvertedTrope Subverted HARD!]] as he managed to reappear into the New World in Build NEW WORLD: Cross-Z

* SmugSnake: Pun aside, Evolto is an incredibly accomplished fighter and he ''knows it.'' He even catches [=RabbitTank=]'s Vortex Finish in the palm of his hand, compliments the force of the blow, tosses Sento to the side and then remarks on the kick's Hazard Level without even coming close to losing his cool. The only things that can throw him off his game are Best Matches that he has never seen before, and even those usually [[ItOnlyWorksOnce only work once]]. Like most examples of the trope, the cracks in Evolt's master plan begin to form because he believes himself to be smarter than everyone else, and starts toying with his victims when he thinks he's won.
* SmugSuper: As Evolto achieves beyond the fourth phase of his powers, he backs it up by knowing that the heroes can't touch him. As Team Build rise and counterattack, it slowly bites him in the rear big time.

* StoryBreakerPower: By the time he reaches his ultimate form, Evolto can destroy entire city blocks with the aftershocks of a casual kick and summon giant black holes that consume entire planets. Combined with his ability to instantly warp anywhere he desires in the universe with just a thought, Evolto is effectively one of, if not the most, powerful antagonists in Kamen Rider (his only real contenders are [[Series/KamenRiderGaim Rosyuo]], [[Series/KamenRiderAgito the Overlord of Darkness]], and, according to supporting information, [[Series/KamenRiderKuuga N-Daguva-Zeba]]). Removing the {{Macguffin}} from his chest aside, the only real reason he doesn't just kill everyone immediately is because he finds it more fun to watch them suffer.

* TheFightingNarcissist: It eventually becomes apparent that Evolto has an ''incredibly'' high opinion of himself as a 'higher organism'. The biggest symptom of this trope is his BerserkButton: he simply ''can't'' tolerate having his ego bruised and will go to extreme, spiteful lengths to make those who have done so suffer.
* ThoseWereOnlyTheirScouts: Subverted. Vernage is shocked only one of his species was able to wipe out Mars, implying this trope, but when other members of his species appear, Evolto is shown to be considerably stronger than any of them (as well as being the only one with an Evol Driver) and they're subservient to him making it clear Evolto is an outlier. Only Kamen Rider Blood is comparable to him, and he requires a mismatch of Build Driver related items to achieve a form on par with the one Evolto ''naturally'' has. In addition, by present day, only five of the Blood Tribe are even left.

* TeethClenchedTeamwork: He partners up with Banjou in their battle against Killbus. While Evolto is eager to work together, Banjou is (justifiably) distrustful of him.
* TimeAbyss: Evolto is at the bare minimum millions of years old and older than life on Earth.

* UltimateEvil: For most of the series, Evolto has no physical form of his own and even once he is complete what he looks like under the armor is hidden. This is despite being one of the most vile and powerful villains in the entire franchise. He only gains an actual face at the end of the series, and unlike most examples more than lives up to it with how powerful and horrifying he is.
* VillainBall: Evolto could have won if he had just killed the other Kamen Riders as soon as he obtained the Black Pandora Panel, but he chose to keep them alive so he could watch them wallow in despair for longer. This provides an opportunity for Rogue to damage his Evol Trigger, buying Sento and Ryuga time to force the Panel out of him.

* VoluntaryShapeshifting: Upon becoming whole, Evolto can assume any form he chooses.

* WorldsStrongestMan: Evolto is, by far, the most powerful character in the main ''Kamen Rider Build'' series and quite possibly the franchise (amongst the riders his only real competitors are Man of the Beginning Gaim, Post Series-Kamen Rider Decade, Ultimate Kuuga, Killbus and [=Cross-Z Evol=]). His Black Hole Form is capable of defeating any character in the series and allows him to wipe cities off the face of the planet in moments. Initially only Sento with his [[SuperMode Genius Form]] is capable of matching him but he quickly surpasses him by tapping into the Evol Driver's ability to use emotions for strength, becoming so powerful that Genius and Cross-Z Magma, who by the end of the series are comparative equals AND both stronger than Black Hole was initially, can ''just'' about slow him down for a few moments. His transformation after incorporating the Black Pandora Panel into himself is borderline invincible, capable of destroying planets in moments. It took the combined might of the other four Riders to fight him off the first time. The second time they needed to exploit a weakness from his Evol Trigger to keep him still and then send him to a pocket dimension to weaken him and it still took the deaths of two Riders and Ryuga sabotaging him from the inside to allow Sento to best him. Even then he manages to come back from THAT and recover his full power yet again. In the end the only way Evolto leaves is in his own terms. Essentially deciding that he doesn't want to destroy the Earth anymore.

* AnimatedArmor: A variation. According to the data found about the Evol Driver, Kamen Rider Evol isn't so much a suit as much as his host [[OneWingedAngel physically transforming]] ''into'' Evolto.

* SpellMyNameWithAnS: Kamen Rider Evol is spelled with two less letters than his true name, Evolto. Which begs the question of why Evolto even bothered making a distinction in the first place. It is also debatable whether his name is spelled "Evolt" or "Evolto".
* StrongAndSkilled: [[ContrastingSequelAntagonist Unlike the previous antagonist]] [[Series/KamenRiderExAid Dan Masamune,]] Evol is not reliant on the overwhelming power of his transformations and can fight competently against any Rider with any of his weaker forms. While [[GrandTheftMe possessing Utsumi]], he managed to fight far more effectively as Mad Rogue than Utsumi himself could and was capable of killing Utsumi with his weakest form [=EvolCobra=] despite the fact that Utsumi also wielded an Evol Driver. Unlike Masamune, Evol has a properly honed fighting style that compliments his overwhelming power, which enables him to fight and hold the upper hand against Sento in his [[SuperMode Genius Form]]. [[UnskilledButStrong By contrast]], Masamune only held the upper hand as Kamen Rider Cronus due to his [[GameBreaker ability to stop time]] and was effortlessly beaten by Emu once he gained access to his [[SuperMode Hyper Muteki Form.]]

* VillainForgotToLevelGrind: The fact that the villain ''cannot'' level grind is a major plot point. If the Transteam System could grow in strength like the Rider System can, Night Rogue's schemes would be much less elaborate. [[spoiler: First he ends up being the victim of TheWorfEffect to Cross Z during the latter's debut. Then we see just ''how'' much of a disadvantage this is for him in comparison to Build in episode 15, when not only does he find himself on the receiving end of a CurbStompBattle against Build's [=RabbitTank=] Sparkling form, but Build is able to ''NoSell'' him in that form]].

* VillainForgotToLevelGrind: The fact that the villain ''cannot'' level grind is a major plot point. If the Transteam System could grow in strength like the Rider System can, Night Rogue's schemes would be much less elaborate. [[spoiler: First he ends up being the victim of TheWorfEffect to Cross Z during the latter's debut. Then we see just ''how'' much of a disadvantage this is for him in comparison to Build in episode 20, when not only does he find himself on the receiving end of a CurbStompBattle against Build's [=RabbitTank=] Sparkling form, but Build is able to ''NoSell'' him in that form]].