History Characters / KamenRiderBuildFaust

* AdultFear: Her Smash form was hunting her own child. Luckily she doesn't remember any of that.

* AdultFear:
** He doesn't remember his family after being turned back into human. [[spoiler:After episode 12 however, his memories have started to return to him.]]
** This gets worse when Nabeshima and his family are targeted by Seito's Guardians in an attempt to force a surrender from Touto in the representative battle. [[spoiler:Thankfully, Kazumi was there to wipe out the Guardians and get them to safety.]]

[[center: [- [[Characters/KamenRiderBuild Main Character Index]] | [[Characters/KamenRiderBuildProtagonists Protagonists]] ([[Characters/KamenRiderBuildSentoKiryu Sento Kiryu/Kamen Rider Build]]) | '''Faust''' | [[Characters/KamenRiderBuildToutoGovernment Touto Government]] | [[Characters/KamenRiderBuildHokuto Hokuto Government]] | [[Characters/KamenRiderBuildSeito Seito Government]] | [[Characters/KamenRiderBuildNambaHeavyIndustries Namba Heavy Industries]] | [[Characters/KamenRiderBuildMovieExclusiveCharacters Movie-Exclusive Characters]]]]-]

[[folder:Blood Stalk '''(MAJOR SPOILERS)''']]
!!Evolt/Blood Stalk/Kamen Rider Evol
!!!'''Portrayed by:''' Tetsuo Kanao (voice), Kazuya Okada (suit)
[[quoteright:219:https://static.tvtropes.org/pmwiki/pub/images/krbu_blood_stark_7.png]]
[[caption-width-right:219:''Mistmatch! Co-Cobra...Cobra...Fire!'']]
[[caption-width-right:219:[[labelnote:Click here to see Evolt's true form]]\\
https://static.tvtropes.org/pmwiki/pub/images/evolt.png[[/labelnote]]]]

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

Another figure behind Faust, an enforcer and strategist that carries out his duties with a disturbingly flippant attitude. Openly refers to himself as Faust's strategist.

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 laid 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 Soichi 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.

!!!Tropes that apply to him in general
* 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.
* AFormYouAreComfortableWith: Even after gaining his own body and being seperated from Soichi, he is so used to Soichi's body due to his long time spent in it that he still takes on Soichi's form as his default "human" form outside of battle.
* AlienInvasion: He is eventually revealed to be an alien invader attempting to wipe out all life on Earth, as he did to Mars in the ancient past.
* 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.
* AxCrazy: And how! He takes his sadism to insane levels to the point that his fellow Blood Tribe members have become [[EvenEvilHasStandards fed up with it]].
* 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.
* BerserkButton:
** 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.
** A 'lesser lifeform' defeating him is another thing Evolt cannot stand and any genuine loss to an 'inferior' opponent will royally tick him off.
* 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.
* BigBadFriend: He acted as one to the protagonists for the first few episodes until his cover was blown by Nabeshima when he regained his memories. Even after the revelation though, he continues to [[FauxAffablyEvil act chummy]] with Sento and co. and treat them like old friends rather than enemies, though they very much don't reciprocate the sentiment.
* 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.
* BizarreAlienBiology: Evolt 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 Evolt 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 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.
* BrokeYourArmPunchingOutCthulhu: He shared a mutual one with Vernage back on Mars. While he did succeed in wiping out the Martians, their Queen proved powerful enough to defeat him in one final duel, leaving him trapped and nigh-helpless on the planet he'd destroyed.
* BroughtDownToBadass: Twice. Fighting Vernage on Mars broke his Evol Driver in half and reduced him to just a helpless blob of goo, but even in this state he could amplify the strength of a human host to Hazard Level 5. When he manages to revive himself in the Cross-Z V-Cinema, he's reduced to only being able to use his Blood Stalk form, and even a deliberate juicing up from Sento only lets him reclaim Evol Cobra. He displays his true form after the battle, but his dialogue indicates that this is just his true shape from his homeworld rather than the universe-devouring Fever Flow.
* CainAndAbel: Evolt and Killbus don't get along at all. Both want to wipe out everything in the universe but Evolt wants leave himself alive while Killbus just wants to destroy everything including himself, which ironically makes Evolt the ''Abel'' to Killbus' Cain.
* {{Catchphrase}}: "Ciao!" Even his driver says it whenever he initiates a finisher in Evol Cobra!
* 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 Evolt's coming to fruition, and ''that'' scheme is just the first step of his far grander one.
* ChronicBackstabbingDisorder: Nearly everyone Stalk works with is stabbed in the back ''somehow'', a consequence of his playing every side and his plan being to eventually kill them all. Rogue is his favorite chew toy, who becomes aware enough of this status to thwart Stalk's backstabbing on occasion, but remains too blinded by his ambitions to avoid Stalk's continued manipulations. He ultimately intends to kill [[OmnicidalManiac literally everyone]], so loyalty is decidedly something he lacks.
* ConsummateLiar: He lies so often that it really shouldn't surprise anyone anymore. Notably, the first episode of ROGUE reveals that he seemingly lied about Takumi Katsuragi being Faust's founder since it was shown that Gentoku did most of the groundwork and recruiting with one of those recruits being ''Katsuragi himself''.
* 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 relatively low-key]] [[Series/KamenRiderExAid 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.
** In regards to Rider powers, Kamen Rider Evol is an AncientEvil and alien horror whose central abilities revolve around [[SpaceMaster black holes and space travel]], 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 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 Namba and Utsumi he didn't even need the Box. Evolt 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: 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.
* DeaderThanDead: His final fate: he is not only killed but the merger of worlds means he is effectively erased from existence. Except until he regenerates from the DNA he placed in Ryuga Banjo.
* 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 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.
* DragonWithAnAgenda: Evolt 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.
* 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.
* EnigmaticMinion: When we first see him, he is a mysterious enforcer for the Faust organization. It takes about a quarter into the series for his civilian identity to be discovered, and it is only around halfway through that his true identity is revealed along with the fact that he is the true antagonist of the series.
* EvilCannotComprehendGood: Despite his complex knowledge of the human mind, Evolt 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 Banjo.
* 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.
* EvilLaugh: A deep, echoing sort of laugh that will haunt your dreams. All of them. It is mercifully rare. His Evol Driver does a totally psychotic one when he transforms. Even his ''[=EvolBottles=]'' are made to look like they're silently laughing whenever he turns the crank of the Evol Driver. Once he fuses the completed Black Pandora Panel into himself and cranks up the Black Hole Trigger to its version of Max Hazard On, it turns ''downright maniacal.''
* 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.
* EvilutionaryBiologist: He has spent over a decade fostering research into human exposure to Nebula Gas and the Rider System in hopes of creating a human body with a high enough Hazard Level to possess so that he can use his full powers through it. Once he is done with that scheme, he keeps indulging in the hobby, this time to create Lost Smash.
* EvilMentor: Because Evolt's schemes need both Banjo and Sento to have extremely high Hazard Levels, he plays a mentor figure whenever they need a push to move forward.
** 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.
* EvilVersusOblivion: It verges on Oblivion vs. Oblivion given [[OmnicidalManiac his own goals]], but he freely teams up with Team Build in ''New World: Cross-Z'' to fight his older brother Killbus, if only out of self-preservation.
* TheEvilPrince: Since his brother is stated to be the "King" of the Blood Tribe, it would appear that Evolt has royal blood. It's further alluded to by the fact that the other members of the Blood Tribe we see (besides Killbus) all seem lower-ranked and less powerful than him.
* 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.
* FakeDefector: During the fight with Killbus in the Cross-Z V-Cinema, Evolt 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.
* FatalFlaw:
** His pride. He always believes that he is holding all the cards or is so much more powerful than everyone else (and is usually true), so he keeps the heroes alive partly as part of his plan and partly so that he can make them suffer. His plans do indeed go without a hitch for most of the series, but once it starts nearing the end stages, he starts finding the heroes harder to fight and his plans delayed more often, and the only way he knows how to deal with the frustration over it is to toy with the heroes more, which just gives them both time and motivation to get stronger and counter his plans.
** {{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.
* 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.
* 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.
* ForTheEvulz: While an exact motive for his OmnicidalManiac ambitions has yet to be stated outright, it is heavily implied that this is at the root of his actions, given that his reaction to Utsumi going insane and becoming [=MadRogue=] is one of such great amusement that he reconsiders destroying the Earth.
** 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 Banjo 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 Killbus. Banjo's Blood Tribe DNA is the only other thing that has this level of regenerative ability, which came from Evolt himself.
* GoneHorriblyRight: His plan involved making the Riders heroes so that they'd gain strength for him to exploit in his own plans. He succeeded, but didn't count on them becoming powerful enough to actually oppose him and is ultimately killed by them.
* GrandTheftMe: For most of the series, he has been controlling Soichi's body due to his own body being destroyed. Later, he switches to Ryuga (in order to get back his DNA from him) and then Sento (in order to try and take advantage of his higher Hazard Level) before getting a body of his own. However, he later demonstrates the ability to splinter himself off to possess someone else, though doing so leaves him unable to use his full power until he merges back with the splintered part.
* GreaterScopeVillain: For ''New World: Grease''. Keiji Uraga was one of his victims whom he experimented on, which is the reason he's able to recall the events of the Old World and transform into a Rider in the New World.
* 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.
* HoistByHisOwnPetard:
** He is ultimately killed by the very Riders he created for his plans.
** His DoomsdayDevice is turned against him via the white panel and ultimately used to eradicate him from existence.
* HiddenAgendaVillain: Evolt 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 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.
* ImpaledWithExtremePrejudice: Vernage defeated him in her LastStand by running him through the Evol Driver with a energy {{BFS}}.
* 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.
* IntriguedByHumanity: A horrifying example. After Utsumi [[JumpingOffTheSlipperySlope going insane and joining him]], he declares humanity to be too interesting to kill off and instead decides to conquer them and ''then'' kill them off. How much of this is true and how much is yet another manipulation is up in the air.
* 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. And double subverted in the V-Cinemas, where Evolt manages to survive getting RetGone and completely [[KarmaHoudini gets away]].
* ItAmusedMe: After he gets back his full power, he decides that he is too amused by humanity to immediately kill them off. Instead, he decides to conquer Japan and let them destroy themselves through war. He also decides to develop the Lost Bottles to create Lost Smashes because he thinks it would be ironic if he managed to turn the other Kamen Riders into them, which is why he lets them live for now. Of course, considering that this all comes from his own mouth and he already has a track record for being a ConsummateLiar, whether or not this is just part of yet another one of his larger plans is up in the air. Later, it becomes clear that while he does enjoy what he's doing, it is ultimately just stalling and smokescreen for a plan to become even more powerful.
* 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]].
* 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 Box, is turned against him via the white panel and used as the instrument of his demise.
* 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 Banjo why he wasn't able to save her students, Evolt (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, Evolt is the last of the Blood Tribe. [[SubvertedTrope Subverted]] in the ''Kamen Rider Cross-Z'' V-Cinema where Evolt's [[StrongerSibling older brother]] Killbus comes to Earth sometime after Evolt's downfall. Played straight again after Killbus 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.
* 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 Evolt, 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, Evolt is Ryuga's father. After Ryuga regenerates the DNA needed to transform when Evolt stole it, Evolt outright calls him his 'spawn'.
* ManipulativeBastard: He manages to manipulate pretty much ''everyone'' into furthering his goals. For the villains, he takes advantage of their ambition and offers them power in exchange for working with him, and for the heroes, he forces them into situations where they either have to do something that furthers his plans or let innocent people, especially close loved ones, die. The end result is usually Stalk [[ChronicBackstabbingDisorder betraying]] whoever was foolish enough to go along with his plans before moving on to the next UnwittingPawn, all the while getting closer to [[OmnicidalManiac killing all life on earth]].
* TheManInFrontOfTheMan: Plays along with Night Rogue and later Namba's ambitions, when he's really manipulating them in order to further his own plans. Every one of his supposed "bosses" is another pawn in his plan to regain his full power.
* MasterOfDisguise: He can use his steam to alter a person's appearance. His helmet has a built-in voice modulator to distort his own identity further. Once he is complete, he is capable of full shapeshifting.
* MeaningfulName[=/=]NamesToRunAwayFromReallyFast:
** "Blood Stalk" is a very fitting name for a hunter like him. It also fits the EvilutionaryBiologist traits of Faust, as "foundation bloodstock" is a term referring to animals that are used to create new breeds of their species.
** 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.
* MultilayerFacade: He is revealed to be Soichi, and then revealed to actually be an evil spirit from Mars ''[[DemonicPossession possessing]]'' him.
* NecessaryDrawback: In spite of his immense power, he does have at least one drawback: he needs all his DNA in order to make full use of his power. If he decides to split off his DNA for whatever reason, the best he can do is use Evol Cobra form. It is still powerful, but not as insanely powerful as Black Hole form.
* NiceJobFixingItVillain: Part of his plan involved manipulating the amnesiac Takumi Katsuragi into gathering the Fullbottles for him as Build and helping him train up both his own body and Ryuga's to Hazard Level 5 so that they could be viable hosts to use the Evol Driver with. While his plans works, this also leaves the two strong enough to combat him as well as any other foes that threaten the peace of the world.
* NighInvulnerable: Evolt is nigh impossible to actually kill, as if ''any'' piece of him survives, he can regenerate. This is notably unique to him, as none of the other members of the Blood Tribe possess this ability, even his older brother Killbus.
* ObviouslyEvil: Evolt makes no attempts in ''any'' of his identities to hide the fact that he is a supervillain.
* OffhandBackhand: Does this to a Touto guard during episode 11 which resulted in the man exploding into LudicrousGibs.
* OmnicidalManiac: His aim is to complete the Pandora Tower, rendering the Earth as ruined and lifeless as Mars, after which he will move on and do it all over again somewhere else, with his ultimate goal being to eventually consume everything in the universe except himself.
* 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.
* PetTheDog: In an evil sort of way: Blood Stalk is the one to help Gentoku become Kamen Rider Rogue after his torture at Utsumi's hands. [[TrainingFromHell He is not at all nice about how he does it]], and at one point almost gives up and plans to just have Gentoku put out of his misery.
* 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.
* PlayingBothSides: ''Every'' side receives some form of aid from Stalk, often right before he betrays them to the next person on his list of employers.
* PoisonIsCorrosive: His venom can knock someone out, gradually poison them to death, or instantly liquify their bodies depending on how strong a dose he inflicts. It was originally believed to be a power of the Blood Stark suit, but is eventually revealed to simply be a natural ability of Evolt's he can use in any form.
* PoisonousPerson: Evolt 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 Evolt didn't exist, Ryuga's hair was completely black instead of brown.
* PragmaticVillainy: He mellows out quite a bit when he returns in ''New World: Cross-Z''. He drops his sadism almost completely and the few times he does taunt Ryuga, it's to make him angry so his Hazard Level will go up. Given he's going up against [[GreaterScopeVillain Killbus]] and that the entire universe will be destroyed should he win, he doesn't have time to engage in any KickTheDog behavior. At the end of the movie he chooses to leave Earth on peaceful terms rather than risk another confrontation with Team Build until he's strong enough to come back and face them again.
* PsychopathicManchild: Even when he flies into a fit of rage, he can't help but rant like a petulant child.
* RasputinianDeath: It took about 5 episodes and a stage show for the Kamen Riders to finally kill him, and even then [[NotQuiteDead he didn't stay gone for good]].
* 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.
* SatanicArchetype: Aside from Cobra being his primary Fullbottle and first Evolbottle and red being his main color motif, he also fits in terms of role, as a manipulator who [[DealWithTheDevil offers power to the other villains in exchange for doing his bidding]] only to [[ChronicBackstabbingDisorder screw them over in the end]] while furthering his own plans to [[OmnicidalManiac kill everyone]] by starting TheEndOfTheWorldAsWeKnowIt.
* SealedEvilInACan: Vernage defeated him and crippled his Evol Driver, leaving him weak 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]]".
* SlouchOfVillainy: Manages to outdo Night Rogue in this regard. His first appearance in episode 4 has him actually lying down on a park bench. [[BunnyEarsLawyer In full armor]].
* 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.
* SnakesAreSinister: A cobra-themed villain who is a part of a terrorist group, who is in reality is an alien invader.
* TheSociopath: Everyone else he manipulates are nothing more but stress toys for him to break.
* 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, [[AllThereInTheManual 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.
* SupervillainLair: After forming the Pandora Tower, he makes it his base of operations.
* 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.
** Player straighter when his [[StrongerSibling older brother]] shows up, and stronger than him even without an Evol Driver.
* TheStarscream: Nearly from the moment he shows up, Stalk takes every available opportunity to stab Night Rogue in the back. Rogue eventually catches wise to this behavior, and by episode 10 plans accordingly, not that it helps. If his goals succeed, they will all be dead anyway.
* TheStrategist: Calls himself this for Faust and he is very good at formulating long-term plans.
* TeethClenchedTeamwork: He partners up with Banjo in their battle against Killbus. While Evolt is eager to work together, Banjo is (justifiably) distrustful of him.
* TimeAbyss: Evolt is at the bare minimum millions of years old and older than life on Earth.
* 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]].
* TrainingFromHell: The Blood Stalk suit was originally created by Takumi Katsuragi to act as a designated rival to those using his Kamen Rider system so that their need to surpass Stalk's initially superior capabilities would drive them to increase their Hazard Levels. In his own twisted way, the current wielder of the suit is fulfilling the technology's purpose while performing a little terrorism on the side.
* 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.
* VillainousBreakdown: Sento's actions in episode 36 are the first thing to ever make Stalk legitimately lose his temper when there is no one around for him to be fooling or manipulating by pretending to be upset. He gets his plans back on track in short order, but it's the first time something happens that he was in no way prepared for, and he doesn't take it well.
** A second one in episode 41 after he is defeated by Build Genius Form and is enraged that a "lower lifeform" has prevented his plans from succeeding various times.
** And again in episode 45. This time the heroes manage to deal him a decisive defeat that actually sets back his plan right when he could have won. This, combined with the fact that his moves are now limited by everyone knowing his agenda has him ''seething'' with rage.
** 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.
* WalkingSpoiler: His identity as Soichi Isurugi is this, and TheReveal that he is another being altogether possessing Soichi is ''even more this.''
* WeWillMeetAgain: The events of ''New World Cross-Z'' allow him to restore a partial strength monster form. He decides that he is going to leave Earth for a while but will return once he is fully recovered. The nigh inconceivable horror of this casually thrown out statement is slightly mitigated by the fact that Banjo now has access to the most powerful form among the Build riders.
* WeaponOfChoice: As opposed to Rogue who prefers to [[TheMusketeer Duel Wield]] the [[TransformationTrinket Transteam Gun]] and the Steam Blade individually, Stalk prefers to fight with the [[BifurcatedWeapon Combined]] Steam Rifle.
* WhamLine: ''[[FightingFromTheInside "What are you trying to do?!"]]''
* WhiteHairBlackHeart: During the time he was possessing Sento, he sports white hair, showing the audience who is in charge of the body.
* WhyDontYouJustShootHim: [[CantKillYouStillNeedYou Early on, he leaves the heroes alive because needs them for his plans to regain his full power]]. Once he does regain his full power, he decides that instead of just up and destroying Earth, he can instead keep using the heroes for another plan to become even more powerful, being too convinced that the heroes won't be able to stop him. However, the heroes end managing to steadily close the power gap between them and figure out his plans, making them more and more of a nuisance to him until they end up managing to set back his plan right when he pretty much had completely won. It doesn't help that he's so [[EvilIsPetty petty]] that instead of straight-up killing Sento (the current biggest roadblock to his plans), he wants to kill Sento last, so that he watch as everything he loves is destroyed.
* WildCard: Most of the time, Stalk acts completely on his own initiative even if his actions go at complete odds with the goals of his alleged allies. He is''just'' charming enough, and his allies are all blinded enough by their ambitions and the tastes of power he offers them, that none of them quite realize what he's doing until it's too late. Given his endgame is "kill literally everyone", it is safe to say he's on ''no one's'' side.
* 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 [[Series/KamenRiderGaim Man of the Beginning Gaim]], Post Series-Series/KamenRiderDecade, [[Series/KamenRiderKuuga Ultimate Kuuga]], Killbus and [=Cross-ZEvol=]. 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 fun.
* XanatosSpeedChess: The creation of the Sky Walls was actually ''not'' according to Stalk's plan, so he writes many of his schemes on the fly.
** 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 Banjo, 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.
** In Episode 37, he takes over Sento's body, but it can't complete the Evol Trigger even though it is more powerful. Ryuga has gotten his ability to transform back and is even more powerful than before. However, just as he, Kazumi and Gentoku are about to finish him with a triple Rider Kick, he uses the Evol Trigger to absorb the energy of their attack, allowing him to complete it.
* YouHaveOutlivedYourUsefulness:
** His dealings with Faust, Hokuto, and Namba Industries was all in service of a delicate and lengthy plot to boost Banjo'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 Banjo otherwise.
** The moment he's complete and they're nothing more than an amusing distraction, Namba Industries is swiftly and brutally annihilated.

!!!Tropes exclusive to him as Blood Stalk:
* BattleAura: When unleashing his full power, Stalk begins to emit an aura resembling blood-red flames surrounding his body.
* ChestInsignia: He has a green cobra on his chest.
* FinishingMove: The Transteam Gun gives him several, such as the '''Steam Break'''.
* HellBentForLeather: Like Night Rogue, his suit features quite a lot of leather from the waist down.
* MadeOfIron: Despite the Transteam Gun allegedly setting its user to a fixed Hazard Level, essentially nothing can seriously hurt Stalk unless it takes him by surprise. Even strikes from the berserk Hazard Trigger-enhanced Build [[NoSell only knock Stalk around without actually causing injury to him]]. He often uses these beatings to read his opponent's [[PowerLevels Hazard Level]].
** This is by design, both in the function of the Transteam System and in Stalk's overall plan. Katsuragi Takumi stated in his notes that the main purpose of the Transteam System is to provide an effective training target for Kamen Riders to raise their Hazard Level, so in exchange for a fixed Hazard Level, Transteam forms are durable enough to take a lot of punishment from an opponent continually growing in strength. Since Stalk's plan revolves around Sento and Banjou increasing their Hazard Levels, this form is perfect for him to fight them with.
* MythologyGag: Like many recurring instances of the Bat/Spider/Cobra trio, he's one to Cobra Man, the first Shocker monster from the [[Series/KamenRider original series]] to be revived.
* RedAndBlackAndEvilAllOver: Wears a blood-red suit covered with black pieces of metal.
* ReverseGrip: While Stalk prefers using the Steam Blade and Transteam Gun in their combined form, when he uses the Steam Blade alone he wields it this way.
* ScarfOfAsskicking: He wears a muffler made from car mufflers.
* SinisterShades: Decked out with a green visor. Like Night Rogue above, it is a second green king cobra, though the eyes are much more obvious. The cobra's tail comes up on the left, giving Blood Stalk mismatched horns.
* SnakesAreSinister: The Blood Stalk suit has the power to conjure giant cobras that Stalk can command. They're quite multipurpose, being able to carry people in their stomachs or to attack for Stalk. They're also directly as powerful as he desires them to be, so he can create ones strong enough to battle against the likes of Cross-Z Magma or [=RabbitRabbit=].
* SwordAndGun: Like Night Rogue he uses the [[TransformationTrinket Transteam Gun]] and the Steam Blade in combat.
* WhipItGood: His gauntlets house long prehensile whips.
* WillfullyWeak: As Stalk continues to no-sell attacks from forms that it's increasingly ludicrous for him to match on even ground with nothing but the Transteam System, it becomes more and more obvious that he's holding back an enormous amount of power while pretending to just be an ordinary human. It takes the likes of [=RabbitRabbit=] and [=Cross-Z Magma=] for Stalk to finally stop holding back.

!!!Tropes exclusive to him as Kamen Rider Evol:
[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/krbu_evolcobra_phase1_0.png]]
[[caption-width-right:210:''Are you Ready? Cobra! Cobra! Evol Cobra! Fuhahahahahahahaha!'']]
[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/krbu_evoldragonform_phase2_7.png]]
[[caption-width-right:210:''Are you Ready? Dragon! Dragon! Evol Dragon! Fuhahahahahahahaha!'']]
[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/krbu_evolrabbitform_phase3.png]]
[[caption-width-right:210:''Are you Ready? Rabbit! Rabbit! Evol Rabbit! Fuhahahahahahahaha!'']]
[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/krbu_evolblackholeform_phase4perfection.png]]
[[caption-width-right:210:''Are you Ready? Black Hole! Black Hole! Black Hole! Revolution! Fuhahahahahahahaha!'']]
* AchillesHeel: The Black Hole Trigger may give him access to outrageous amounts of power, but if it's hit hard enough to get jammed, Evol ends up paralyzed. This becomes vital in fighting him when his power reaches levels the rest of the cast can't hope to match.
* 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.
* BlingOfWar: Evol's suit is drastically bulkier than every other Rider costume and dripping with gold.
* ClippedWingAngel: Terrifyingly, the monstrously powerful Cobra Form is a ''drastically'' weakened version of Evolt's true Black Hole form.
* DoItYourselfThemeTune: Evolt provides the voice of his own Driver, complete with a mocking "''Ciao!''" at the end of his finishers. Justified, since it technically is a part of his BizarreAlienBiology.
* EvilCounterpart: To both Build and Cross-Z, complete with forms designed to be knockoffs of each of them. Like Build, Evol has a red and blue color motif underneath all the gold, and utilizes Best Matches, but he only matches everything against Rider System. Like Cross-Z, he's the fusion of an alien with a human, but his alien half dominates his human half.
** Evol also has the ability to use stolen data on Sento's equipment to create copies for his own use.
** Evol's forms are unique among Riders since unlike Build's which provide MultiformBalance and specific abilities, Evol's forms are clear power boosts and they way he obtains them are more akin to something out of a shonen battle manga BigBad's transformations.
* EvilLaugh: His ''belt'' performs a psychotic one at the end of his transformations. ''All'' of them.
* FinishingMove: Like Build's Vortex Finish, Evol can turn the crank on his belt a second time to perform an '''Evoltech Finish''':
** '''Cobra Form (Phase 1)''': Evol forms a star map underneath his foot before absorbing it into his leg and delivering a Rider Kick.
** '''Dragon Form (Phase 2)''': Evol coats his hand in dark blue flames before delivering a punch that projects an energy Chinese Dragon upon impact.
** '''Rabbit Form (Phase 3)''': Either a punch covered in flames and purple energy that sends the target flying, or a roundhouse kick covered in red and orange energy that generates an energy star map upon impact.
** '''Black Hole Form (Phase 4)''': Evol delivers the '''Black Hole Finish''', a powerful flying kick to the enemy, sending them into a black hole which kills them after a period of time.
*** Alternatively, Evol can summon a massive black hole in the air, which is capable of consuming entire buildings.
** Since he retains the Transteam Gun, he can use its '''Steam Attack''' or '''Steam Shot'''.
* FlashStep: Despite the massive bulk of the suit, Evol is so fast that he even leaves afterimages when he moves.
* FourIsDeath: His most powerful form, Black Hole, is his Phase 4. It gives him the power to destroy worlds.
* FusionDance: In ''New World Cross-Z'', he merges with Banjo to create [=Cross-ZEvol=].
* MeaningfulName: Evol is love spelled backwards. This fits him, as Evol effectively fights for the polar opposite of the other Riders: instead of love and peace, Evol fights for selfishness and sadism by causing conflict. The way it's pronounced also sounds like 'Evil,' which obviously fits him.
* MultiformBalance:
** JackOfAllStats: Cobra Form.
** MightyGlacier: Dragon Form.
** LightningBruiser: Rabbit Form.
** SuperMode: Black Hole Form.
* ObviouslyEvil: As if his appearance didn't do a good enough job conveying he's evil, his ''belt'' gives an EvilLaugh at the end of his transformation. He is not exactly subtle about the fact he's a supervillain.
* PsychoactivePowers: His first clash with Sento's Genius form reduces the power of his Black Hole phase, but gives Evolt the capacity to experience genuine emotions, allowing him to gradually raise his formerly capped Hazard Levels.
* SdrawkcabName: His 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.
* SpellMyNameWithAnS: Kamen Rider Evol his true name, Evolt, with a letter knocked off. However, this does make his Rider name an inverted "Love", one of the virtues Sento professes to.
* StrongAndSkilled: [[ContrastingSequelAntagonist Unlike the previous antagonist]] [[Series/KamenRiderExAid Masamune Dan]], 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 [[StoryBreakerPower ability to stop time]] and was effortlessly beaten by Emu once he gained access to his [[SuperMode Hyper Muteki Form.]]
* SuperPrototype: The Rider System was derived from the wrecked components of his Evol Driver, although Stalk never intended for the offshoots to surpass the original, as he just needed them to condition Banjo to reunite with him.
* UnrealisticBlackHole: Black Hole Form, true to its name, utilizes in creating miniature black holes to trap his opponents. He also uses black holes for his transformation sequence and to teleport from place to place. He also replaces Stalk's [[PoisonIsCorrosive poison]] with the ability to simply [[NoBodyLeftBehind disintegrate]] anything he touches. He can even makes larger ones to destroy structures at will.

* BigBadFriend: He acted as one to the protagonists for the first few episodes until his cover was blown by Nabeshima when he regained his memories.

* TheEvilPrince: Since his brother is stated to be the "King" of the Blood Tribe, it could mean that Evolt has royal blood.

* 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.

* TheManInFrontOfTheMan: Plays along with Night Rogue and later Namba's ambitions, when ultimately he's just acting loyal to them in order to further his own plans.

* 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.

[[center: [- [[Characters/KamenRiderBuild Main Character Index]] | [[Characters/KamenRiderBuildProtagonists Protagonists]] | '''Faust''' | [[Characters/KamenRiderBuildToutoGovernment Touto Government]] | [[Characters/KamenRiderBuildHokuto Hokuto Government]] | [[Characters/KamenRiderBuildSeito Seito Government]] | [[Characters/KamenRiderBuildNambaHeavyIndustries Namba Heavy Industries]] | [[Characters/KamenRiderBuildMovieExclusiveCharacters Movie-Exclusive Characters]]]]-]

** KarmaHoudiniWarranty: 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.

* 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.

* WhyDontYouJustShootHim: Early on, he leaves the heroes alive because needs them for his plans to regain his full power. Once he does regain his full power, he decides that instead of just up and destroying Earth, he can instead keep using the heroes for another plan to become even more powerful, being too convinced that the heroes won't be able to stop him. However, the heroes end managing to steadily close the power gap between them and figure out his plans, making them more and more of a nuisance to him until they end up managing to set back his plan right when he pretty much had completely won. It doesn't help that he's so [[EvilIsPetty petty]] that instead of straight-up killing Sento (the current biggest roadblock to his plans), he wants to kill Sento last, so that he watch as everything he loves is destroyed.

** The name becomes even ''more'' meaningful when it comes to light that [[spoiler:[[BigBad Evolto]] was directly behind the events that led 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...]]

!!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 laid 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 Soichi 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 Evolto'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 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.
* 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 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 at all. Both want to wipe out everything in the universe but Evolto wants leave himself alive while Killbus just wants to destroy everything including himself, which ironically makes Evolto the ''Abel'' to Killbus' 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, the [[ChronicBackstabbingDisorder duplicitous]] and [[EvilIsHammy bombastic]] Evolto/Kamen Rider Evol easily differs a lot from the erriely [[DissonantSerenity composed]] and [[ColdHam relatively low-key]] [[Series/KamenRiderExAid 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 Namba 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 Evolto'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.
* 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.
* 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 Banjo.
* 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 Banjo 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.
* 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.

** {{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.
* 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.

** 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 Banjo 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 Killbus. Banjo's Blood Tribe DNA is the only other thing that has this level of regenerative ability, which came from Evolto 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 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 Banjo 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 Evolto's [[StrongerSibling older brother]] Killbus comes to Earth sometime after Evolto's downfall. Played straight again after Killbus 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, 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.
** 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.

* NighInvulnerable: Evolto is nigh impossible to actually kill, as if ''any'' piece of him survives, he can regenerate. This is notably unique to him, as none of the other members of the Blood Tribe possess this ability, even his older brother Killbus.
* 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.

* 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.

* PoisonIsCorrosive: His venom can knock someone out, gradually poison them to death, or instantly liquify their bodies depending on how strong a dose he inflicts. It was originally believed to be a power of the Blood Stark suit, but is eventually revealed to simply be a natural ability of Evolto's he can use in any form.
* 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
* 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 Evolto ''naturally'' has. In addition, by present day, only five of the Blood Tribe are even left.

* TeethClenchedTeamwork: He partners up with Banjo 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 [[Series/KamenRiderGaim Man of the Beginning Gaim]], Post Series-Series/KamenRiderDecade, [[Series/KamenRiderKuuga Ultimate Kuuga]], Killbus and [=Cross-ZEvol=]. 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 Evolto 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 Banjo, 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.

* ClippedWingAngel: Terrifyingly, the monstrously powerful Cobra Form is a ''drastically'' weakened version of Evolto's true Black Hole form.
* DoItYourselfThemeTune: Evolto provides the voice of his own Driver, complete with a mocking "''Ciao!''" at the end of his finishers. Justified, since it technically is a part of his BizarreAlienBiology.

* PsychoactivePowers: His first clash with Sento's Genius form reduces the power of his Black Hole phase, but gives Evolto the capacity to experience genuine emotions, allowing him to gradually raise his formerly capped Hazard Levels.

* SpellMyNameWithAnS: Kamen Rider Evol his true name, Evolto, with a letter knocked off. However, this does make his Rider name an inverted "Love", one of the virtues Sento professes to.
* 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 [[StoryBreakerPower ability to stop time]] and was effortlessly beaten by Emu once he gained access to his [[SuperMode Hyper Muteki Form.]]

A Smash sent after Ryuga by his captors in order to recapture him and/or kill him. Created by transforming a man named Shimizu Kyoichi, who was held captive at the same time as Banjo. Was stopped in his tracks by Build. His essence-turned Full Bottle was Gorilla. [[spoiler:Forty episodes later he turns out to be a lot more important than it seemed at first, as he was one of Shinobu Katsuragi's students and becomes the Stag Lost Smash. Despite Sento's best efforts he winds up dead when Evolto kills him to both anger Sento and to keep him from revealing any secrets.]]

* 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 Evolto.]]

* AFormYouAreComfortableWith: Even after gaining his own body and being seperated from Soichi, he still takes on Soichi's form as his "human" form outside of battle.

!!!Portrayed by Jun Watanabe (suit), Kensei Mikami (voice, I), Yuki Ochi (voice, II)

* 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]].

!!!Portrayed by Tetsuo Kanao (voice), Kazuya Okada (suit)

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 laid 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.

* 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 Evolt's need for vengeance, which only gives Sento more time to chip away at Evolto's plans.

* 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]] Killbus comes to Earth sometime after Evolto's downfall. Played straight again after Killbus bites the dust.

!!!Portrayed by Hajime Kanzaki (suit)

!!!Portrayed by Hajime Kanzaki (suit)

!!!Portrayed by Hajime Kanzaki (suit)

!!!Portrayed by Kazuya Okada (suit)

!!!Portrayed by Kazuya Okada (suit: Mirage), Satoshi Fujita (suit: Square)

** This gets worse when Nabeshima and his family are targeted by Seito's Guardians in an attempt to force a surrender from Touto in the representative battle. [[spoiler: Thankfully, Kazumi was there to wipe out the Guardians and get them to safety.]]

* LaserGuidedAmnesia: Downplayed, since he seems to not remember things in general, but it was mostly towards his family and Faust, and even then, there are still some memories of Faust [[spoiler: having similar devices to [=FullBottles=].]] [[spoiler:At the end of Episode 12 however, his memories are coming back, and he immediately calls Sento on some new revelations.]]

!!!Portrayed by Hajime Kanzaki (suit)

!!!Portrayed by Hajime Kanzaki (suit)

!!!Portrayed by Hajime Kanzaki (suit)

Kyoka is the mother of the late Takumi Katsuragi. She did not know of her son's involvement with Faust until Sento and Ryuga appeared in Hokuto, where she was teaching kids in the area. After witnessing Kamen Rider Build save one of her students and hearing from Blood Stak about her son, she agrees to take the two back to Touto and give them the data Takumi gave her before his death. She is soon captured by Night Rogue, and is turned into the Strong Smash Hazard after giving them the location [[spoiler: (a fake one)]] on where the data is. Her essence was used to create the Lock Full Bottle.

!!!Portrayed by Hajime Kanzaki (suit)

!!!Portrayed by Kotaro Kaji(suit)

* LongRangeFighter: It relies on its long tendrils to attack its foes but it's not great at close range. Once [[spoiler: Cross-Z]] gets close enough, it is swiftly defeated.

!!!Portrayed by Kyohei Yamaguchi (suit)

!!!Portrayed by Jun Watanabe(suit)

* CainAndAbel: Evolto and Killbus don't get along at all. 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 Evolto the ''Abel'' to Killbus' Cain.

* NighInvulnerable: Evolto is nigh impossible to actually kill, as if ''any'' piece of him survives, he can regenerate. This is notably unique to him, as none of the other members of the Blood Tribe possess this ability, even his older brother Killbas.

* 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 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 Evolto ''naturally'' has. In addition, by present day, only five of the Blood Tribe are even left.

** The moment he's complete and they're nothing more than an amusing distraction, Nanba Industries is swiftly and brutally annihilated.

A Smash sent after Ryuga by his captors in order to recapture him and/or kill him. Created by transforming a man named Shimizu Kyoichi, who was held captive at the same time as Banjou. Was stopped in his tracks by Build. His essence-turned Full Bottle was Gorilla. [[spoiler:Forty episodes later he turns out to be a lot more important than it seemed at first, as he was one of Shinobu Katsuragi's students and becomes the Stag Lost Smash. Despite Sento's best efforts he winds up dead when Evolto kills him to both anger Sento and to keep him from revealing any secrets.]]

[[spoiler:After Sawa's cover as a Nanba spy is revealed to Misora, she reports it to Juzaburo. Having no more use for her, Faust kidnaps her and turns her into the Stretch Smash in order to lure out Kamen Rider Build so Night Rogue can claim the remaining [=FullBottles=]. While [=LockDragon=] Build can't defeat her, it was the newly created Kamen Rider Cross-Z that did it.]] The essence was later used to create the Octopus [=FullBottle=].

* IHaveYourWife: One of ''many'' tactics he employs to keep people under his thumb is threatening their loved ones. One such person is [[spoiler: [[DirtyCop Masahiro Nabeshima]], who was blackmailed into framing Banjo Ryuuga so he could be spirited away for Smash experimentation.]]

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

** The name becomes even ''more'' meaningful when it comes to light that [[spoiler: [[BigBad Evolt]] was directly behind the events that led 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...]]

* 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.

!!Evolt/Blood Stalk/Kamen Rider Evol

%% For consistency, this wiki sticks to the "Evolt" spelling and not "Evolto". Please do not make edits to "correct" the spelling.

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.
** A 'lesser lifeform' defeating him is another thing Evolt cannot stand and any genuine loss to an 'inferior' opponent will royally tick him off.
* 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.
* BizarreAlienBiology: Evolt 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 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 Killbus don't get along. Both want to wipe out everything in the universe but Evolt wants leave himself alive while Kilbus just wants to destroy everything including himself, which ironically makes Evolt 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 Evolt'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, the [[ChronicBackstabbingDisorder duplicitous]] and [[EvilIsHammy bombastic]] Evolt/Kamen Rider Evol easily differs a lot from the erriely [[DissonantSerenity composed]] and [[ColdHam relatively low-key]] [[Series/KamenRiderExAid 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 Banjo [[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.
* DeaderThanDead: His final fate: he is not only killed but the merger of worlds means he is effectively erased from existence. Except until he regenerates from the DNA he placed in Ryuga Banjou.
* 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 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.
* DragonWithAnAgenda: Evolt 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.
* 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 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 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.
* FakeDefector: During the fight with Killbus in the Cross-Z V-Cinema, Evolt 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.

** {{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.
* 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.

** 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.

* HiddenAgendaVillain: Evolt 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 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 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, 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.

* NighInvulnerable: Evolt is nigh impossible to actually kill, as if ''any'' piece of him survives, he can regenerate. This is notably unique to him, as none of the other members of the Blood Tribe possess this ability, even his older brother Killbas.
* 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.

* 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.

* PoisonIsCorrosive: His venom can knock someone out, gradually poison them to death, or instantly liquify their bodies depending on how strong a dose he inflicts. It was originally believed to be a power of the Blood Stark suit, but is eventually revealed to simply be a natural ability of Evolt's he can use in any form.
* PoisonousPerson: Evolt 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 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.

* 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, Banjo 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 [[Series/KamenRiderGaim Man of the Beginning Gaim]], Post Series-Series/KamenRiderDecade, [[Series/KamenRiderKuuga Ultimate Kuuga]], Killbus and [=Cross-ZEvol=]. 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.

* 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.

* ClippedWingAngel: Terrifyingly, the monstrously powerful Cobra Form is a ''drastically'' weakened version of Evolt's true Black Hole form.
* DoItYourselfThemeTune: Evolt provides the voice of his own Driver, complete with a mocking "''Ciao!''" at the end of his finishers. Justified, since it technically is a part of his BizarreAlienBiology.

* PsychoactivePowers: His first clash with Sento's Genius form reduces the power of his Black Hole phase, but gives Evolt the capacity to experience genuine emotions, allowing him to gradually raise his formerly capped Hazard Levels.

* SpellMyNameWithAnS: Kamen Rider Evol his true name, Evolt, with a letter knocked off. However, this does make his Rider name an inverted "Love", one of the virtues Sento professes to.
* StrongAndSkilled: [[ContrastingSequelAntagonist Unlike the previous antagonist]] [[Series/KamenRiderExAid Masamune Dan]], 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 [[StoryBreakerPower ability to stop time]] and was effortlessly beaten by Emu once he gained access to his [[SuperMode Hyper Muteki Form.]]
* SuperPrototype: The Rider System was derived from the wrecked components of his Evol Driver, although Stalk never intended for the offshoots to surpass the original, as he just needed them to condition Banjou to reunite with him.

A Smash sent after Ryuga by his captors in order to recapture him and/or kill him. Created by transforming a man named Shimizu Kyoichi, who was held captive at the same time as Banjou. Was stopped in his tracks by Build. His essence-turned Full Bottle was Gorilla. [[spoiler:Forty episodes later he turns out to be a lot more important than it seemed at first, as he was one of Shinobu Katsuragi's students and becomes the Stag Lost Smash. Despite Sento's best efforts he winds up dead when Evolt kills him to both anger Sento and to keep him from revealing any secrets.]]

* 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.]]

After Ryuuga escaped, Faust captured his girlfriend Kasumi and turned her into the Burn Smash in order to eliminate him. Build defeats her, but due to her poor health, she couldn't survive the removal of her Smash essence. Her love for Ryuuga later gave form to the Dragon Full Bottle.

* EmptyShell: As one of Nanba's Clone Smash, this one has no personality and no human form.

* EmptyShell: As one of Nanba's Clone Smash, this one has no personality and no human form.

----

* FusionDance: In ''New World Cross-Z'', he merges with Banjou to create [=Cross-ZEvol=].

[[/folder]]

* FamousLastWords: In the last episode:
---> '''Evolt:''' You think you can destroy me!? Like hell you will, '''you puny humans!'''
** And then in Kamen Rider Build: Final Stage:
---> '''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...

* 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]]:

* 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 [[KamenRiderGaim Man of the Beginning Gaim]], Post Series-Series/KamenRiderDecade, [[Series/KamenRiderKuuga Ultimate Kuuga]], Killbus and [=Cross-ZEvol=]. 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.

* 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 [[KamneRiderGaim Man of the Beginning Gaim]], Post Series-Series/KamenRiderDecade, [[Series/KamenRiderKuuga Ultimate Kuuga]\, Killbus and [=Cross-ZEvol=]. 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.

* 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.

* ShoutOut: Like many recurring instances of the Bat/Spider/Cobra trio, he's one to Cobra Man, the first Shocker monster from the [[Series/KamenRider original series]] to be revived.

* StrongAndSkilled: [[ContrastingSequelAntagonist Unlike the previous antagonist]] [[Series/KamenRiderExAid Masamune Dan]], 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.]]

* WeWillMeetAgain: The events of ''New World'' allow him to restore a partial strength monster form. He decides that he is going to leave Earth for a while but will return once he is fully recovered. The nigh inconceivable horror of this casually thrown out statement is slightly mitigated by the fact that Banjo now has access to the most powerful form among the Build riders.

* FlawedPrototype: {{Subverted}}: the Smash are failed prototypes of Night Rogue's real end goal, but Stalk likes them just fine, both as refineries for his [=FullBottles=] and in their own right as a means of having humanity tear itself apart.

* MonsterOfTheWeek: The Smash subvert this; while they are there to be a monster for the heroes to battle, fighting them is ''not'' the main focus of the episodes, and some are only onscreen for a few minutes before being defeated. "Smash-of-the-Week" are eventually phased out entirely in favor of Rider battles, only to start making a comeback in the last act with the Lost Smash.

[[folder: General Tropes]]

[[folder: Night Rogue]]

[[folder: Blood Stalk '''(MAJOR SPOILERS)''']]

* FlawedPrototype: Subverted: the Smash are failed prototypes of Night Rogue's real end goal, but Stalk likes them just fine, both as refineries for his [=FullBottles=] and in their own right as a means of having humanity tear itself apart.

!!Evolt / Blood Stalk / Kamen Rider Evol

[[folder: Smash]]

A Smash sent after Ryuga by his captors in order to recapture him and/or kill him. Created by transforming a man named Shimizu Kyoichi, who was held captive at the same time as Banjou. Was stopped in his tracks by Build. His essence-turned Full Bottle was Gorilla. [[spoiler: Forty episodes later he turns out to be a lot more important than it seemed at first, as he was one of Shinobu Katsuragi's students and becomes the Stag Lost Smash. Despite Sento's best efforts he winds up dead when Evolt kills him to both anger Sento and to keep him from revealing any secrets.]]

* FightingFromTheInside: [[spoiler: She ends up shooting herself a couple of times in order to stop herself from hurting Ryuuga. Sento notes that this is not common because most Smash lose their identity.]]

* ChekhovsGunman: [[spoiler: It turns out that she is a friend of Shinobu Katsuragi, didn't know that he faked his death, and was key for the nascita gang to discover that Shinobu was still alive.]]

* AdultFear: He doesn't remember his family after being turned back into human. [[spoiler: After episode 12 however, his memories have started to return to him.]]

* SmallRoleBigImpact: Nabeshima only appears in a few episodes, often in flashbacks, but his role in Ryuuga's prison experiences is vital to solving Ryuuga's fugitive status. [[spoiler: Its also thanks to him that Soichi's secret identity gets exposed.]]

* MistakenIdentity: Unfortunately for him, [[spoiler: he's right about Sento having Taro Satou's ''face'' but he's not. Taro was killed to provide a body double for Takumi Katsuragi, with Blood Stalk swapping out their faces and giving the amnesiac Katsuragi the name "Kiryu Sento."]]

* KidsAreCruel: Subverted. Takehiko might be attacking Build and his classmates, but it was not by choice.

[[AC: Tropes from the Clone Press Smash Hazard:]]

[[AC: Tropes from the Clone Stretch Smash Hazard:]]

* AnimalMotifs: Hedgehog.

* AnimalMotifs: Gorilla.

* AnimalMotifs: Hawk.

* AnimalMotifs: 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.

* AnimalMotifs: Jellyfish.

* AnimalMotifs: Gorilla.

* AnimalMotifs: Panda.

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

* LongRangeFighter: It realizes on its long tendrils to attack its foes but it's not great at close range. Once [[spoiler: Cross-Z]] gets close enough, it is swiftly defeated.

* AnimalMotifs: Octopus.

* AnimalMotifs: Hawk.