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7[[center: [- [[Characters/KamenRiderZeroOne Main Character Index]] | [[Characters/KamenRiderZeroOneHidenIntelligence Hiden Intelligence]] ('''Aruto Hiden''') | [[Characters/KamenRiderZeroOneAIMS AIMS]] | [[Characters/KamenRiderZeroOneMetsubouJinraiNET MetsubouJinrai.net]] | [[Characters/KamenRiderZeroOneZAIAEnterprise ZAIA Enterprise]] ([[Characters/KamenRiderZeroOneGaiAmatsu Gai Amatsu]]) | [[Characters/KamenRiderZeroOneOtherCharacters Other Characters]] | [[Characters/KamenRiderZeroOneMovieExclusiveCharacters Movie-Exclusive Characters]]]] -]
8----
9
10!!This is a partial character sheet for ''Series/KamenRiderZeroOne''. Visit [[Characters/KamenRiderZeroOne here]] for the main character index. Subjective trope and audience reactions should go on the [[YMMV/KamenRiderZeroOne YMMV page]].
11
12This page details tropes for Aruto Hiden from ''Series/KamenRiderZeroOne''.
13
14'''Note: Unmarked spoilers ahead. If you're starting the series, ''do not'' read this page!'''
15----
16
17!!Aruto Hiden/Kamen Rider Zero-One/Kamen Rider Zerozero-One/Kamen Rider Zero-Two (I)/Kamen Rider Ark-One (I)
18!!!'''Portrayed by:''' Fumiya Takahashi (live), Yuya Nawata (suit)\
19'''Young Aruto Portrayed by:''' Haruto Nakano
20[[quoteright:275:https://static.tvtropes.org/pmwiki/pub/images/aruto_hiden.jpg]]
21[[caption-width-right:275:CEO of Hiden Intelligence and Hiden Manufacturing]]
22[[caption-width-right:275:[[labelnote:Click here to see young Aruto.]] https://static.tvtropes.org/pmwiki/pub/images/young_aruto.png[[/labelnote]]\
23[[labelnote:Click here to see Aruto in ''Reiwa Generation''.]]https://static.tvtropes.org/pmwiki/pub/images/production_image1_4.png[[/labelnote]]]]
24
25-->''There's only one person who can stop you, and that's me!''
26
27The protagonist of ''Zero-One'', as well as the titular Rider. Aruto Hiden is a 22-year old kind-hearted failed comedian who is suddenly named the President of Hiden Intelligence and receives the authority to transform into Kamen Rider Zero-One following the passing of his grandfather. After losing his inherited position, Aruto goes on to start his own company, Hiden Manufacturing. He eventually resumes presidency of Hiden Intelligence to reinitiate [=HumaGear=] production in order to assist humanity's recovery and counteract the Ark's destruction.
28----
29
30[[foldercontrol]]
31
32[[folder:General Tropes]]
33* AFatherToHisMen: Or, [=HumaGear=], which he also sees as equals to mankind in society. Aruto constantly asserts nothing but good faith and optimism in them and salvaging the destroyed body of 119nosuke, even if his memory can be restored on Zea's memory bank and uploaded to a new body. When ZAIA Enterprise bought Hiden Intelligence, Aruto spent two episodes salvaging a discarded [=HumaGear=] to be repaired in Hiden Manufacturing and greeted it with pure joy upon its activation.
34* AllLovingHero: Is a DeconReconSwitch on this character archetype due to the series emphasizing that his deep empathy for humans and [=HumaGear=] alike and his desire to see them live and work together peacefully also means that he feels ''very deeply'' when either is hurt. The first hint comes when his anger at Gai causes Shining Assault Hopper's chestlight to glow with the same ominous red light as the Ark, and when [[spoiler:Horobi kills Is despite Aruto [[UngratefulBastard trying to reach out and appeal to his better nature for so long]], it drives Aruto to accept the power of the Ark and become Kamen Rider Ark-One. The reconstruction comes once he realizes that he's simply perpetuating a cycle of endless hatred that will destroy the world, leading him to reject Ark-One's power, allowing him to gain Realizing Hopper, defeat Horobi, and talk Horobi around to a HeelRealization and HeelFaceTurn.]]
35* AndIMustScream: Unlike previous berserker forms such as [[Series/KamenRiderW [=FangJoker=]]], [[Series/KamenRiderOOO [=PuToTyra=]]], or [[Series/KamenRiderBuild [=Hazard=]]], Aruto is ''fully'' aware of what is happening as his body is being possessed while in [=MetalCluster=] Hopper but is utterly powerless to do anything to stop the Ark from wreaking havoc on all in its way. With the Progrise Hopper Blade made from gathering data from several [=HumaGears=] he knew well, including Is, Aruto fights off the Ark's corruption, and then gets teleported into Zea, freeing him and averting this trope.
36* AndroidsArePeopleToo: He is a fervent believer of this, due to being raised and saved by his [=HumaGear=] father, and thus [[AllLovingHero works to save both humans and [=HumaGears=] alike]].
37* AscendedFanboy: Is a huge fan of the InUniverse ''Perfuman Sword'' manga and was practically {{squee}}ing when he got to meet the manga's artist even as President of Hiden Intelligence.
38* BadassInANiceSuit: After he's named the new CEO of Hiden Intelligence, he starts wearing a suit… [[PlayingWithATrope over his hoodie, showing his lack of professionalism]]. When he does do something actually worthy of his CEO title, however, he wears the full thing and looks a lot sharper. He's also a Kamen Rider, so naturally he qualifies for the badass part.
39* BenevolentBoss: Despite Aruto's lack of experience in the business world, he inherited his grandfather's good faith in workers. He reprimand others only when he needed to (such as 119nosuke), but gives credit when its due.
40* BerserkButton: In general, people who mistreat [=HumaGears=] or disrespect people's dreams. Gai quickly turns himself into Aruto's biggest berserk button of all, both because he's responsible for everything that's happened with the Ark and because he's an arrogant prick.
41* BokeAndTsukkomiRoutine: Although his intended comedy act falls flat, the show itself manages to derive much humor from him and Is playing off each other when she explains the joke. This ironically makes Aruto the tsukkomi in the dynamic when he’s trying to play the boke, something Fukkinhoukai Taro lampshades in the [=YouTube=] special.
42* ButtMonkey: He is late to his job, finds out an android is a better comedian than he is and trips performing a dramatic slide after the finisher. ''[[EstablishingCharacterMoment In the very first episode]]''.
43* TheCape: Aruto's primary motivation is the help others fulfill their dreams and help people and [=HumaGear=] alike simply because it's the right thing to do and he's an AllLovingHero. He's also a fundamentally honest person who will always tell the truth if he has a choice. [[spoiler:He temporarily loses these traits during his stint as Ark-One when he hits his DespairEventHorizon.]]
44* CannotTellAJoke: [[HonestCorporateExecutive Aruto Hiden]] aspires to be a comedian but because his routine is all about [[IncrediblyLamePun half-baked puns]] and [[LargeHam excessive overreacting]] even by Japanese standards, no one laughs at them, save for [[TheComicallySerious Isamu Fuwa]].
45* CatchPhrase:
46** [[PreMortemOneLiner "There's only one thing that can stop you, and that's me!"]]
47** Whenever he gets asked for his name in combat, he replies, "[[MyNameIsInigoMontoya Zero-One! That's my name!]]"
48** He usually ends his jokes with: "Yes! It must be me, Aruto!"[[labelnote:Note]]The original catchphrase is "Aruto ja nai to!", a rhyme that roughly translates to "And that's Aruto!" It is translated differently depending on the subs group you watch. For the official subtitled release, it was translated as "And that's Aruto, folks!"[[/labelnote]]
49* TheChainsOfCommanding: He is responsible for the company and whatever happens with the [=HumaGear=] is automatically blamed on him. The pressure starts growing exponentially after [=MetsubouJinrai.NET=]'s attack on the hospital in #8 and #9, leaving him pressured.
50* CharacterDevelopment: Aruto respected [=HumaGears=] as individuals, but his encounters with the revived Jin made him realize that [=HumaGears=] can also have the same rights, freedoms, and dreams as people do. So not only is Aruto fighting for the safety of [=HumaGears=], but also fighting for their individuality when they reach Singularity.
51** The fact Aruto started up Hiden Manufacturing is another sign of his growth. Early on, Aruto wanted nothing to do with Hiden Intelligence, set on becoming a comedian. He reluctantly took the President position in order to be Zero-One. Over the course of the series, we see him slowly adjust to the role, fighting hard to make sure it didn't get bought out by ZAIA. For him to [[StartMyOwn start his own company]] to help people and [=HumaGear=] alike shows how far he's come.
52** Another form of growth within Aruto applies to his fighting style as well. His first experience with a weapon, the Attache Calibur, in the series, had him fumbling with it and taking some time to properly deploy, an awkward moment since he was already transformed into Zero-One. The epilogue movie ''REAL×TIME'', on the other hand, has him wielding the Attache Calibur with such finesse that he's able to [[spoiler:fling it across a large church hall with enough speed and precision to stop [[TheStarscream Bell]] from killing [[HeelFaceTurn Rihito]] with a close-range attack]], ''untransformed''.
53* CheerThemUpWithLaughter: Following an incident in his childhood where he failed to get a "smile from the heart" from his [=HumaGear=] father shortly before the latter's demise, with his last words telling Aruto to follow his dreams, he grows up to be an aspiring comedian to bring smiles to people around him. He soon learns there are other ways to bring joy to people, such as being a ''hero''.
54* ColorCodedSecretIdentity: Thankfully it's not too outrageous, as the prominence of the colors is switched around (Zero-One is black with neon yellow armor and some red highlights; Aruto meanwhile wears his suit with a bright red hoodie and neon shoes).
55* ContrastingSequelProtagonist:
56** He serves as this to [[Series/KamenRiderZiO Sougo Tokiwa]] in a variety of ways. On a meta level, Sougo was the final Rider of the Heisei era while Aruto is the first of the Reiwa era, and in-series, they are also completely different: Sougo was a high schooler with an absurd dream to become a king which ulimately is within his power, while Aruto is an adult with a modest dream of "making people smile" that he isn't skilled enough to pull off via his chosen profession (comedy), though he is able to succeed once he changes his focus. [[spoiler:They also both utilize evil powers at the end of their respective stories (Oma Zi-O for Sougo and Ark-One for Aruto), but while Sougo used Oma Zi-O to kill the BigBad and repair all the damage caused to the timeline, Aruto discarded Ark-One's power and utilized a stronger version of his base form to defeat Horobi without destroying him.]]
57** While [[Series/KamenRiderExAid Emu Hojo]] and Aruto are AllLovingHero primary Riders of their respective series. both of which are written by Yuya Takahashi, that may be the only similarity. Emu is an unpopular doctor [[spoiler: and also the PatientZero]] who values everyone's lives [[spoiler:due to an incident caused by his PatientZero infection]], while Aruto is a president of a famous company who got the position via {{Nepotism}}. Both see humanity in another race (Bugsters for Emu, [=HumaGears=] for Aruto), but Emu spent most of his time opposing Bugsters due to them being naturally human's enemies, while Aruto spent most of his time caring for [=HumaGears=], only fighting them when he has no choice to. Emu also refused to sway from his heroic nature, even when some of his friends wound up dying, [[spoiler: while Aruto [[DespairEventHorizon was traumatized by Is's death]] long enough to [[BecameHisOwnAntithesis accept Ark's power.]]]]
58* CorneredRattlesnake: Untransformed, he's ''very'' strong compared to what his physique suggests, but this only shows itself in mortal danger. Coincidentally, both incidents that demonstrate this involve an Attache Calibur, albeit in opposing manners (being able to withstand Will pressing it into his shoulder and recovering with naught but a gauze sling vs. [[spoiler:making an inhumanly-precise and well-timed shot to stop Lucifer by throwing it at blinding speeds across a large church hall]].)
59* CrazyPrepared: ItRunsInTheFamily. Even without being aware that he has the ''personal'' rights to all [=HumaGear=] and Zero-One's technology, he had all the [=HumaGears'=] data transferred from Zea into Progrise Keys kept on his person before he stepped down, preventing Gai from permanently erasing all [=HumaGear=] data himself. Mamoru's Key even doubled as a handy PocketProtector when he TookTheBullet for Is.
60* DarkAndTroubledPast: The Daybreak Incident killed his Humagear father. It's also why the reason he sees Humagears and Humans as the same.
61* {{Determinator}}: Like many Riders before him, he has a resolute streak that drives him forward through the good and bad. In the first episode, he charges at the Berotha Magia unarmed to save people and getting knocked around doesn't stop him. He also does not lose his conviction even when [[spoiler:he loses the Workplace competition against ZAIA and thus his company, instead he just keeps walking with a face of grim determination complete with the episode title showing underneath him]].
62-->[[spoiler:Episode 29: Our Dreams Don't Break]]
63** The Zero-Two jingle sums up his conviction the best:
64--->''It's never over.''
65* DontExplainTheJoke: Says this word-for-word when Is takes apart his joke in order for people to understand it.
66* DorkKnight: He is a Kamen Rider, but he also aspires to become a comedian. Sadly, no one laughs at his quips. Even in the world of business, he's not afraid of cracking some jokes and goofing around. The first thing he does in his grandfather's room is to fiddle around with all of the decorations and machinery in there out of excitement. He also playfully calling his Progrise Keys with some kind of AffectionateNickname (for example, he refers Flaming Tiger Key as "kitty").
67* EarlyBirdCameo: He makes a brief appearance in ''Film/KamenRiderZiOOverQuartzer'', as part of a dream that Sougo wakes up from at the beginning of the movie.
68* EnsignNewbie: Due to having only inherited his position as President through {{nepotism}}, Aruto is completely new to corporate work and the A.I. industry, generally lacking work ethics and the intellect to create/fix robots his grandfather was widely known for, and he barely scrapes by his days at work by just being a HonestCorporateExecutive.
69* {{Foil}}: To {{Corrupt Corporate Executive}}s like Gai. Gai is also a Kamen Rider and CEO, while engaging in several underhanded schemes to get his company ahead. Aruto, on the other hand, is a HonestCorporateExecutive who uses his position to help [=HumaGear=] and humans co-exist while fighting to defend both as Zero-One, even going so far as to reveal his identity to Isamu, in spite of Is telling him otherwise.
70* ForHappiness: Aruto wanted to become a comedian because he enjoys the laughter and smiles from everyone.
71* GiftedlyBad: He really wants to be a great stand-up comedian, but his entire style of comedy consists of very lame puns and [[ChewingTheScenery ridiculous overacting even by Japanese comedy standards]]. No matter how much he tries, he only ever gets awkward silence from his audience (if they haven't left the room already). Not that it ever stops him. So far, the only one to find his jokes funny InUniverse is Isamu.
72* GodzillaThreshold:
73** In ''[[TheMovie Kamen Rider: Reiwa The First Generation]]'', due to the presence of Another Zero-One, Aruto can't use the Zero-One Driver to transform. As a result, he has to use another transformation belt. The belt in question? ''The [=MetsubouJinrai=] [=ForceRiser=]''.
74** In #30, [[spoiler:after being displaced as the President of Hiden Intelligence and Gai's order to recall and decommission any and all [=HumaGear=] that are still functioning, Aruto decides to fight back against Gai's orders and go to save Is after she's deactivated. The person he goes to for help in rescuing her? '''Jin.''']]
75* HesBack: [[spoiler:After a pep-talk with his father, Aruto lets go of the malice he has for Horobi once and for all, finally transforming back into Zero-One and becoming a hero once again. He even becomes the Aruto we all know and love once again, ending the show with a bright smile on his face.]]
76* HeroWithBadPublicity:
77** Subverted. Aruto initially follows Is's suggestion of hiding his identity as Zero-One from A.I.M.S, which of course leads to some misunderstandings between him, Isamu and Yua during their initial meetings until Aruto decides to transform in front of Isamu to prove he is an HonestCorporateExecutive.
78** Played straight to a depressing degree in the Hiden Intelligence VS ZAIA Enterprise Arc. [[spoiler:Thanks to Gai tossing a [=ZetsumeRiser=] at MC Check It Out's feet and the latter transforming into a Magia of his own free will, the public sways to Gai's belief that [=HumaGear=] are dangerous and should be scrapped. Making matters worse is that the public also turns against Aruto when he attacks Thouser when trying to stop the fight between MC Check It Out and Yua. By the end of #28, the majority of the public is now fully behind Gai.]]
79* HiddenDepths:
80** Surprisingly enough, when he isn't trying to make a joke Aruto is shown to actually have the people skills and PR chops you'd expect from the CEO of a large corporation.
81** Aruto can be possessive when it comes to his equipment. He demands Jin give back the Flying Falcon progrise key he stole and gets mad at Fuwa when Fuwa takes the Attache Calibur, also demanding he give it back. And Aruto even attempts to use Jin's Attache Arrow to fight him when he used the Attach Calibur.
82* HonestCorporateExecutive: In contrast to villains such as [[Series/KamenRiderExAid Kuroto Dan]] or [[Series/KamenRiderBuild Juzaburo Namba]], Aruto runs on this in order to defend people from [=MetsubouJinrai=].net, as well as to clear Hiden Intelligence's reputation and have everyone live in harmony with the [=HumaGears=] without any form of misunderstandings. He begins asserting his credentials regarding this as early as #2, where rather than try to cover up the Magia situation as Jun tries to do, Aruto makes the identities of the true culprits public knowledge, complete with video evidence, and then in #4 where he reveals that the Daybreak Incident was also caused by [=MetsubouJinrai.net=] in order to exonerate a lab technician that was blamed for it. In the same episode, he also revealed his Zero-One identity to Isamu, making his secret identity last for only 3 episodes.
83* IncrediblyLamePun: His comedy is heavily reliant on quick wordplay gags. Even in-universe, they're considered rather half-baked compared to those of his fellow comedians who use longer jokes or props.
84* InstantExpert: Played with. When Aruto first puts on the Zero-One Driver, it uploads his consciousness into Hiden Intelligence's satellite, where he goes through a YearInsideHourOutside tutorial on its usage before regaining consciousness to combat the Magia and even then, in his first use of [[FinishingMove Rising]] [[DivingKick Impact,]] while he successfully defeated the Berotha Magia, he failed to stick the landing and crashed against the wall.
85* LargeHam: He has a remarkable range of exaggerated expressions and tends to overreact at times. It's also part of his routine as comedian.
86* TheMainCharactersDoEverything: Aruto's inexperience with corporate work leads him to believe being the company's president also requires him to meet every client face-to-face and personally deliver their [=HumaGears=] (and of course, he's also pulling triple duty as a Kamen Rider), which tends to perplex other company staff. Of course, this conveniently lets him keep running into new adventures every episode.
87** Of course, given that he only accepted becoming a CEO to be able to protect people as Zero-One, this works on his favor.
88* MeaningfulName: His given name literally means "Alternate Person", while it is also read similarly to how the "Alternate/ALT" button on a keyboard would be read in JapaneseRanguage. This is signified through a keyboard-based merchandise having his name on where the ALT button would be.
89* {{Nepotism}}: How he ends up becoming Kamen Rider Zero-One and Hiden Intelligence’s CEO.
90* NiceGuy: Aruto's dream is to make people smile. It was why he became a comedian. This dream also means ''protecting'' smiles, like [[Series/KamenRiderKuuga a certain other Rider who was the first of his era.]] And he respects [=HumaGears=] and cares for them very much. A good example is from #2, where Aruto has a friendly conversation with a security [=HumaGear=] named Mamoru and thanks him for protecting the employees at Hiden Intelligence. Aruto sees a wound on Mamoru's arm and it reminded him of his father, so he decides to give him a handkerchief bandage to cover up his wound. [[AndroidsArePeopleToo He even tells Mamoru that they are a family together after finding out his grandfather gave Mamoru his name]].
91* TheNicknamer: Does this to the Progrise Keys that are/was in his possession (i.e Flying Falcon is dubbed '''Tori-chan/Birdy''', Flaming Tiger is dubbed '''Tora-chan/Kitty''', etc).
92* PlotSensitiveSnoopingSkills: [[spoiler:Jin]]'s suspicions on [[spoiler:Ikazuchi]]'s abrupt HeelFaceTurn in #39 go entirely unheeded by Aruto despite him having been direct witness to the latter's history as a ManchurianAgent. It gets [[spoiler:Aruto beaten to the brink of death and his Driver seized by Ark-Zero]].
93* PoorCommunicationKills: Notably ''defied'', given the franchise's history with this trope. Aruto is an extremely honest person who publicly reveals the discoveries he makes about the rogue [=HumaGear=] situation and his SecretIdentity lasts for all of three episodes before he decides to drop it to remain honest.
94* PositionOfLiteralPower: Only the CEO of Hiden Intelligence can don the [[TransformationTrinket Zero-One Driver]] to transform into [[HenshinHero Kamen Rider Zero-One]]. Accepting the position of CEO allows Aruto to beat up opponents since Episode 1.
95* PungeonMaster: Aruto's act specializes in bad puns, and he brings out one or two in every episode.
96* PutOnABus: Doesn't appear in the first part of ''Zero-One Others'' due to being sent into space shortly before the film begins.
97* TheQuisling: [[spoiler:In ''Series/KamenRiderOutsiders'', Aruto is among the stalwart heroes that supported [[TheComputerIsYourFriend Zein]], an authoritarian artificial intelligence that has a zero-tolerance for malice and required humanity's extinction to achieve salvation. The very idea that he, along with the other heroic Riders are willing to sell out mankind to a KnightTemplar A.I. to eliminate the villains is basically a betrayal of their duty as Kamen Riders.]]
98* RageBreakingPoint: In the ZAIA Arc during the third match. Aruto already demonstrated he had problems with [=MetsubouJinrai=] turning [=HumaGear=] that GrewBeyondTheirProgramming into Magia, but seeing normal [=HumaGear=] transform by way of abuse, followed by their destruction at the callous hands of Gai, is enough to make him livid.
99* RaisedByRobots: When he was young, he was taken care of by the Soreo Hiden [=HumaGear=].
100* RefusalOfTheCall: [[RejectingTheInheritance He's not interested in succeeding his grandfather]] until he gets involved in a [=HumaGear=] attack and asks Is to hand him his Driver. Even after he becomes a Kamen Rider, he's still not actually sold on the position and only does so because he wants to protect people.
101* ResignedToTheCall: Wasn't ''particularly'' interested in being the CEO of Hiden Intelligence, questioning if someone who lives by the punchline should even be in such a predominant position. Unfortunately, being the CEO is the only way he can fight as Zero-One and protect innocents.
102* RippleEffectProofMemory: In ''Kamen Rider Reiwa: The First Generation,'' Aruto is unaffected by the timeline changes created by Finis and Another Zero-One. ''Film/KamenRiderZiOOverQuartzer'' implies that Aruto is a creation of Sougo Tokiwa like the Future Riders, who also had this power.
103* SayMyName: Everytime Humagears get destroyed, Aruto will yell their name.
104* ScrewTheRulesImDoingWhatsRight: Ultimately forgoes Is's advice to hide his secret identity from A.I.M.S. in order to prove to them that he's an HonestCorporateExecutive who won't hide from them any secrets.
105* SecretIdentity: Aruto hides his identity from A.I.M.S. at Is's advice...[[SubvertedTrope for all of three episodes, before he decides he's had it with secrets and lies]]. He transforms in front of Isamu as a conscious refutation of this trope, deciding he can't be an HonestCorporateExecutive if he keeps secrets.
106* SecondPlaceIsForWinners: [[spoiler:Double subverted. While he still lost his position at HIDEN Intelligence after the Workplace Competition, his grandfather's specific patenting assured that he still has ownership over what Gai was after in particular, leaving him free to use his resources to create HIDEN Manufacturing and continue their battle.]]
107* SignatureSoundEffect: In some episodes, when he attempts to make a joke towards anyone he meets, there are comedic percussion instruments played during this moment, befitting his comedian nature.
108* SitcomArchNemesis: He considers Fukkinhoukai Taro as his personal rival in comedy for not only taking his job back in #1 but also being better at making people laugh. Though the whole thing where he becomes a Magia and has to fight him as Zero-One is a different story.
109** Even when Gai became his regular Arch-Nemesis, he ultimately ends up being the one to humiliate him more.
110* StartMyOwn: [[spoiler:Starting from #30, Is creates a brand new company named HIDEN Manufacturing for him, with him as the president, with the primary purpose to rebuild and protect [=HumaGears=] following Gai Amatsu's recall.]]
111* TookALevelInBadass: Aruto was already fairly competent in the beginning of the series, but he goes through several more levels after fighting [=MetsuboJinrai.net=] and Gai Amatsu. To boot, he went from getting his ass kicked by Gai to serving multiple [[CurbStompBattle ass-whoopings]] in return with ease. Not to mention, his business savvy gets a major boost after being the CEO of Hiden Intelligence and [[spoiler:Hiden Manufacturing.]]
112* ToughRoom: Most don't laugh at his jokes...except for [[TheComicallySerious Isamu]].
113* TraumaCongaLine: As a child, he lost both his biological father and his surrogate robotic one within the span of a few years. The events of the show proper are far from kind to him either, with every victory matched by a terrible setback. [[spoiler:Even when he undoes those setbacks, as shown with restoring Is and returning to Hiden Intelligence, the post-series finds a way to sully ''that'' by promptly killing and/or depowering almost every single one of his Kamen Rider allies]].
114* UnexpectedSuccessor: He was the last person to ever think his grandfather would name him as the next CEO of Hiden Intelligence.
115* UniversallyBelovedLeader: In #16, the higher-ups of Hiden convene to determine whether or not to remove Aruto as President. When they vote for Aruto's removal, ''no one other than Jun raises his hand.'' It also speaks volumes about the executive board when after [[spoiler:ZAIA buys out Hiden Intelligence]], most of them resigned instead of choosing to be demoted. Sanzo even asked Aruto to reconsider leaving the company and instead work as a lower-ranking member. Notably, even a large number of the ''villains'' have respect for him.
116* WillNotTellALie: Aruto is a very honest person and the fact Hiden Intelligence attempts to cover things up seriously rubs him the wrong way. Thus whenever he has a choice, he will tell the truth.
117[[/folder]]
118
119[[folder:Tropes exclusive to him as Zero-One]]
120
121!!!Tropes exclusive to him as Kamen Rider Zero-One
122[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/kr01_zero_onerisinghopper_7.png]]
123 [[caption-width-right:210:''Progrise! To-bia ga Rise!'' '''''Rising Hopper!'''''\
124[[AC:''A jump to the sky turns to a Rider Kick.'']]\
125''Progrise! Initialize! '''Realizing Hopper!'''''\
126[[AC:''A Rider kick to the sky turns to take off toward a dream.'']]]]
127[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/kr01_zero_oneshininghopper.png]]
128 [[caption-width-right:210:''Progrise!''\
129[[AC:''The rider kick increases the power by adding to brightness.'']]\
130'''''Shining Hopper!''''' ''When I shine, darkness fades.'']]
131[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/kr01_zero_oneshiningassaulthopper.png]]
132 [[caption-width-right:210:''Progrise!''\
133[[AC:''Warning, Warning. This is not a test.'']]\
134''[[FusionDance HybridRise!]] '''Shining Assault Hopper!'''''\
135[[AC:''No chance of surviving this shot.'']]]]
136[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/kr01_zero_onemetalclusterhopper.png]]
137 [[caption-width-right:210:''Progrise!''\
138[[AC:''Let's Rise. Le-Le-Let's rise.'']]\
139'''Metal Rise!'''\
140[[AC:''Secret material: Hiden Metal.'']]\
141'' '''[=MetalCluster=] Hopper!''' ''\
142[[AC:''It's high quality.'']]]]
143[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/kr01_zero_onehellrisinghopper_5.png]]
144 [[caption-width-right:210:''Progrise! [[AC:Hell's energy has destroyed the world.]]''\
145[[AC:''Hellrising Hopper'']]\
146'''''Heaven or Hell... It doesn't matter.''''']]
147
148* EleventhHourSuperpower: Aruto only obtains Realizing Hopper in the very last episode, as his final rejection of ThePowerOfHate that was driving the conflict of the final arc. He gets to keep it for the movies and spinoffs, though!
149* AbilityMixing: Shining Assault Hopper is made possible thanks to Aruto combining the Assault Grip from the Assault Wolf Progrise Key with the Shining Hopper Progrise Key, creating a form that has both Shining Hopper's incredible speed and Assault Wolf's incredible power. As an extra bonus, both Zea ''and'' the Ark work together to create the armor.
150* AbsurdlySharpClaws: Flaming Tiger form gives Zero-One the Tiger Gauntlets, a pair of claws that also have ports in the palms that can release streams of flames. Freezing Bear also has its own pair of claws called the Bear Gauntlets, which also has similar capabilities as Flaming Tiger.
151* AdvertisedExtra: Flying Falcon form, which was the first additional form advertised and released in the toyline and the one used in Aruto's early appearance in the Zio film. In the show proper it gets used twice, and then the key is stolen and used by Jin for the entirety of the rest of the first quarter. By the time it's retrieved the initial element forms are completely outdated in the face of Shining Hopper and then Metal Cluster Hopper so it's used one final time so Thouser can take it's data and then never touched again for a total of 3 uses in the entire show. In fact it's the only one of Zero-One's initial set of forms that isn't used in Reiwa Generations because it takes place when Jin still has it.
152* AnIcePerson: It's in the name of Freezing Bear. With his Bear Claws, Zero-One can generate and manipulate ice from the palms and tear through everything.
153* AnimalThemedSuperbeing: The [[TransformationTrinket Progrise Keys]] that provide him the superpowered suits are based on animals, and each one has a specific specialty based on that animal. To provide two examples, Zero One's base form is Rising Hopper (grasshopper) with a "Jump" ability that allows him to [[InASingleBound jump to enormous heights]], and one of his side forms is Flying Falcon (falcon) with a "Wing" ability that allows him to [[{{Flight}} fly]]. The primary, grasshopper themed Progrise Key, in particular, goes through [[NextTierPowerUp several iterations]], including [[DeadlyUpgrade a dangerous MetalCluster Hopper]] that utilizes [[TheSwarm a swarm of nanomachine locusts]].
154* ArtifactOfDoom: The Hellrising key was made by the main antagonist of ''REAL×TIME'', using a bootleg Thousand Jacker and the stolen Zero-Two key to create a new Progrise Key designed to ''destroy the world''. As such, not only is it filled to the brim with evil emotions similar to [=MetalCluster=] and the Ark, using it makes Aruto go mad and badly wrecks his body since it was never meant to be used as a Rider form, let alone by a human.
155* TheBerserker:
156** When first used, [=MetalCluster=] Hopper is under the direct control of the Ark, [[WeaponWieldsYou which puppeteers Aruto while he struggles against it]]. Aruto's resistance doesn't mean much due to the abilities of the form, since the Ark prefers to attack by using the swarm of locusts that form the suit rather than with physical blows. The result is an unusual case of a berserker form that doesn't have to ''move'' to slaughter everything around it with brutal efficiency. On later uses of the form prior to its severance from the Ark, the Ark ''does'' opt for moving around, in a style that would be right at home in ''Film/TheShining''.
157** Hellrising Hopper is even worse in this regard; Aruto experiences agonizing pain when using it due to the negative emotions saturating the Progrisekey, a more amplified version of the stress he undergoes as Ark-One. It causes him to attack Kamen Rider Eden with vicious brutality, and he is only stopped from using a FinishingMove on Eden [[spoiler:thanks to Is's intervention.]]
158%%* Big Creepy Crawlies: Rising Hopper, Shining Hopper, Shining Assault Hopper, and Metal Cluster Hopper are all based on the grasshopper. [=MetalCluster=] Hopper is more specifically based on species of grasshoppers that [[TheSwarm swarm]] known as locusts. Gai specifically had the [=MetalCluster=] Hopper Progrise Key designed with this trope in mind.
159* BladeBelowTheShoulder: Biting Shark form trades some of Zero-One's physical power for access to blades on all four limbs called the Shark Gauntlets and Shark Greaves. While its abilities are best suited to fighting underwater, on land it still stands out in situations where slicing attacks are a necessity.
160%%* Boxing Kangaroo: Hopping Kangaroo, based on the kangaroo.
161* ChromeChampion: [=MetalCluster=] Hopper is pure silver (with a few bits of chartreuse here and there) and has the strength to manhandle Thouser even after Aruto takes control of it back from the Ark.
162* CoolSword:
163** The Attache Calibur. It has the ability to charge energy within the blade by folding the blade in and out to perform a SwordBeam. Loading Progrise Keys into the sword will enhance the energy based on the Progrise Key used and the sword becomes stronger when combined with the Progrise Hopper Blade.
164** The Progrise Hopper Blade. It can use [=MetalCluster=] Hopper's Cluster Cells to augment its attacks, and can form a double-bladed weapon by combining with the Attache Calibur. Being made with the hopes, trust and joy of every [=HumaGear=] Zero-One's helped, it not only protects him from the Ark and lets him use [=MetalCluster=] Hopper's power himself, but also lets him counter the Ark's hacking and undo the effects of Zetsumerisers on hacked [=HumaGears=] and even Raiders too.
165* CombatClairvoyance: Shining Hopper and Shining Assault Hopper are both capable of this, relying on Zea's calculation abilities to choose the next course of action.
166* CombatParkour: Zero-One is capable of doing flips in battle thanks to Rising Hopper's jumping abilities. Zero-One is also capable of doing jumps and flips in Hopping Kangaroo as well.
167* ConfusionFu: As Shining Hopper can calculate and change tactics at the last second, predicting Zero-One's next move becomes impossible.
168* DarkIsNotEvil:
169** Compared to the soft-angled and primarily white color-schemed Vulcan and Valkyrie, Zero-One's dark suit, harsh edges, and red eyes would look [[https://i.redd.it/lqdjz5tqyel31.jpg rather menacing in certain circumstances.]] However, Aruto remains a heroic figure all the same.
170** In the hands of another other person, Hellrising Hopper would be a Rider form capable of ending the world ala Kuuga Ultimate. In the hands of Aruto, however, it's used for the purpose of defending it.
171* DeadlyUpgrade:
172** Much like [[Series/KamenRiderDrive Drive's Type Formula]], Shining Hopper form grants Zero-One more speed and strength than his body is capable of handling, with extended usage causing him to collapse from the strain.
173** Metal Cluster Hopper is a much straighter example, being similar to berserker forms like Build's Hazard Form or OOO's [=PuToTyra=] Form. Similarly to Hazard Form, using another auxiliary device allows him to control its power--in this case, the Progrise Hopper Blade.
174** Hellrising Hopper isn't designed for use by a flesh and blood human body, similar to forms like Assault Wolf. Unlike Assault Wolf, the safeties are ''so'' lax that just throwing a punch causes Aruto to break his arm, after which the suit agonizingly forces it back into shape. The form also builds up energy with each attack, and at one point Aruto literally ''explodes'' while he's manhandling Eden, effectively turning him into an ActionBomb.
175* DiscardAndDraw: The Progrise Hopper Blade causes [=MetalCluster=] Hopper to restrict the ability to use the Cluster Cells, which were so powerful that Zero-One only needed to stand still and they would do all the fighting for him. In exchange, however, he gains a shapeshifting weapon that possesses enough destructive power to bring Thouser to his knees, while also having other uses for defensive and utility purpose to aid him in battle (i.e shield with varying size, a distraction or footholds for airborne battle.) and [[HealingShiv can turn Magia back into their normal HumaGear form]].
176* DoppelgangerSpin: The Shining Hopper and Shining Assault Hopper forms can create holographic digital images of Zero-One that can be used to distract the opponent and he can pick one of the images in motion to use for his next move.
177* DroneDeployer: Shining Assault Hopper has a "Shine System" that deploys the Shine Cryster which acts both as an AttackDrone and an OrbitingParticleShield. [=MetalCluster=] Hopper, when under the Ark's control, takes things a step further by making the entire suit out of drones called Cluster Cells.
178* DualWielding: Zero-One in Metal Cluster Hopper Form can wield the Attache Calibur and Progrise Hopper Blade in both of his hands (and possibly the Authorise Buster assuming Fuwa isn't using it).
179* EvilCounterpart: While it ''is'' used for a heroic purpose, if only very briefly, the Hellrising Hopper Progrisekey was made using the Zero-Two Progrisekey as a base, and as stated by S, it was designed for the sole purpose of ending the world. In terms of appearance, Hellrising Hopper looks like a [[RedAndBlackAndEvilAllOver red and black Shining Assault Hopper]].
180* ExplosiveOverclocking: Realizing Hopper's strength comes from continuously generating ultra-high output data from its Progrisekey then compressing it into a format that can be read by the Zero-One Driver. This gives it far more power than the Driver should normally be capable of producing, but at the cost of overloading it and reducing the amount of time that Aruto can remain transformed.
181* FinishingMove: Depending whether from his Driver or an auxiliary weapon.
182** Zero-One Driver
183*** '''Rising Impact''': In Rising Hopper form, Zero-One runs up the the enemy and launches it up in the air via a kick before performing two powerful rider kicks: one to thrust the enemy back downward, and the other to destroy it.
184*** '''Flying Impact''': In Flying Falcon Form, Zero-One sprouts a pair of mechanical falcon wings from his back and flies toward the target before grabbing them with his legs and lifting them into the air. He then throws the enemy and delivers a Rider Kick covered in magenta energy.
185*** '''Biting Impact''': In Biting Shark form, Zero-One repeatedly slashes the enemy with the shark fins on his arms and legs, projecting chartreuse yellow and teal crescents in the process, before sending them sky high, projecting several teal energy shark fins from his arms, and slashing the enemy with them.
186*** '''Flaming Impact''': In Flaming Tiger form, Zero-One projects a ring of fire before charging through them and delivering powerful slashes at the enemy with the Tiger Gauntlets.
187*** '''Freezing Impact''': In Freezing Bear form, Zero-One freezes the enemy into a glacier before chopping them in two.
188*** '''Breaking Impact''': In Breaking Mammoth form, Zero-One detaches one of the Progrise Keys mounted on its arms before kicking it down towards the enemy and crushing them with it.
189*** '''Shining Impact''': In Shining Hopper form, Zero-One delivers a pair of high-speed kicks. A more powerful version is called the '''Shining Mega Impact''', which allows him to delivers a series of high-speed kicks that propel the enemy into the air before landing more kicks, destroying the enemy.
190*** '''Shining Storm Impact''': In Shining Assault Hopper, Zero-One jumps and performs a Rider Kick charged with yellow and blue energy at high speeds.
191*** '''Metal Rising Impact''': In [=MetalCluster=] Hopper, Zero-One turns his swarm of Cluster Cells into constructs that assist in his Rider Kick. This can consist of forming duplicates that do the kick for him, creating a construct to block the opponent's counterattack and then using it like a [[ThisIsADrill giant drill]], or a mix of both.
192*** '''Hopping Impact''': In Hopping Kangaroo, Zero-One channels the Progrise Key's Rider Model into a punch, then kickflips his opponent into the air, where he unleashes a barrage of punches onto them, before winding up and throwing one last powerful punch at them.
193*** '''Realizing Impact''': As Realizing Hopper, he performs a more powerful version of his '''Rising Impact''' finisher, sending the opponent up into the sky with a Rider Punch before assaulting his target with a barrage of kicks before sending them downward, then delivering a final Rider Kick to destroy them.
194*** '''Hellrising Impact''': Zero-One, in Hellrising Hopper, gathers energy in his fist as he runs and delivers a rider punch.
195** Attache Calibur
196*** '''Rising Kaban[[note]]Dispatch/Encased, depending on the fansub.[[/note]] Strash''': By inserting the Rising Hopper Progrise Key in his Attache Calibur in Blade Mode, yellow cyber-like energy is emitted from the Attache Calibur's blade before Zero-One delivers a powerful slash.
197*** '''Biting Kaban Strash''': By inserting the Biting Shark Progrise Key into it while it's in Blade Mode, teal cyber-like energy is emitted and makes projections of multiple shark fins before Zero-One delivers a powerful slash.
198*** '''Flaming Kaban Dynamic''': By inserting the Flaming Tiger Progrise Key into it while in Blade mode then charge it in Attache Mode then switch back to Blade Mode, Zero-One delivers a series of red fiery slashes.
199*** '''Metal Rising Kaban Dynamic''': By inserting the [=MetalCluster=] Hopper Progrise Key in the Attache Calibur's Blade Mode after opening it from its Attache Mode, Zero-One delivers two powerful metallic slashes at his targets.
200** Authorise Buster
201*** '''Buster Bomber''' (Rising Hopper): By inserting the Rising Hopper Progrise Key into the Authorise Buster in its Axe Mode, Zero-One performs a slash charged with yellow energy.
202*** '''Progrise Dust''' (Rising Hopper): By scanning the Authorise Buster in its Gun Mode with the Rising Hopper Progrise Key, Zero-One can fire bullets charged with yellow energy.
203*** '''Zero-One Dust''': By scanning the Authorise Buster in its Gun Mode on his Hiden Zero-One Driver, Zero-One can fire a energized bullet that takes the shape of a grasshopper before striking the enemy.
204*** '''Buster Dust''' (Freezing Bear): By inserting the Freezing Bear Progrise Key into the Authorise Buster in its Gun Mode, Zero-One shoots an energy polar bear construct.
205*** '''Zero-One Buster Bomber''' (Biting Shark): By inserting the Biting Shark Progrise Key into the Authorise Buster Axe Mode, and then scanning it on the Hiden Zero-One Driver, the Authorise Buster generates two projections of several energy shark fins every time its swung, which deliver a powerful "bite" to the target.
206*** '''Buster Bomber''' (Breaking Mammoth): By inserting the Breaking Mammoth Progrise Key into the Authorise Buster in its Axe Mode, Zero-One fires 2 constructs resembling Mammoth Legs at the opponent, crushing them, then follows up by launching a construct of a mammoth's tusk at the opponent.
207** Progrise Hopper Blade
208*** '''Progrising Strash''': Zero-One pulls the trigger of the Progrise Hopper Blade multiple times to give it an edge made from Cluster Cells, then swings it, firing the edge at the opponent. It has the ability to destroy [=ZetsumeRisers=] completely, returning Magia back to their original [=HumaGear=] form.
209*** '''Ultimate Strash''': Zero-One combines the Attache Calibur Blade Mode to the Progrise Hopper Blade and scans the Progrise Hopper Blade on the Zero-One Driver, creating a large edge of Cluster Cells on the Progrise Hopper Blade. With one swing, Zero-One sends that edge flying to strike the opponent, and uses another two swings to detonate it and attack the opponent with two electric-green slashes, dealing a tremendous amount of damage.
210*** '''Final Strash''': Zero-One scans the Progrise Hopper Blade on the Zero-One Driver, causing it to release a large swarm of Cluster Cells upon swinging, which form into several large spikes as they fly into the targets. Alternatively, after scanning the Progrise Hopper Blade, Zero-One summons three Cluster Cell shields to defend from incoming attacks.
211* {{Flight}}: Flying Falcon grants Zero-One the ability to fly in antigravity fashion: unlike a real falcon, he can hover.
212* FragileSpeedster: Flying Falcon trades much of Zero-One's physical strength for the power of {{Flight}}.
213* ForceAndFinesse: Relative to every other Rider:
214** Compared to the A.I.M.S. Riders, whose Progrise Keys for the most part just directly increase their physical abilities, Zero-One's Keys tend to keep his physical abilities about the same as his base form. Instead, he gains a wide array of superpowers that are useful in specific circumstances, giving him the flexibility he needs to strike at a foe's weakness. When he starts gaining more general-purpose superpowers, they're ones like DoppelgangerSpin and PestController that require a lot of skill to use effectively, whereas upgrades like Assault Wolf simply load Vulcan up with more armor and more guns.
215** Compared to the [=MetsubouJinrai.net=] Riders, whose rough and heavy armor has a deliberate lack of elegance to it, Zero-One's armor is sleek and lightweight. This even applies to himself as Zerozero-One, who otherwise shares the aesthetic of the other Force Riser users.
216** Compared to Thouser, who's UnskilledButStrong, Zero-One is WeakButSkilled. Thouser has a massive advantage in every physical parameter, and the Thousand Jacker lets him use every other Progrise Key's powers with the push of a button, but he doesn't use those advantages effectively due to a lack of talent and experience.
217* ForcedTransformation: How Zero-One obtained [=MetalCluster=] Hopper. Gai forcibly inserts the Progrise Key into the Zero-One Driver, which also proceeds to hijack his consciousness and turn him into TheBerserker.
218* GlassCannon: Flaming Tiger trades some of Zero-One's defense for further increase in power.
219* GodzillaThreshold: The Hellrising Hopper Progrisekey is this. [[spoiler:Initially, Aruto attempts to use it in order to defeat S, but the second he accesses the form, he attempts to destroy the Progrisekey while it's still inside the Driver as it drives him mad.]]
220* HealingFactor: Hellrising Hopper grants Aruto one, which is the only way he can survive its effects on his body, as it grants the usual strength of a Rider ''without'' the usual RequiredSecondaryPowers.
221* HealingShiv: As a side effect of being made to erase the Ark's control over [=MetalCluster=] Hopper, the Progrise Hopper Blade can restore a Magia to their [=HumaGear=] form, even if they were wearing a [=ZetsumeRiser=]. It also works on [=RaidRisers=].
222* {{Hammerspace}}: What Hopping Kangaroo grants Zero-One, allowing him to literally pull a [=HumaGear=] from the pocket on his chest to pull a CombinationAttack on his opponent.
223* InASingleBound: Rising Hopper allows Zero-One to jump to enormous heights. He actually underestimates this ability in its first usage, and ends up landing on top of a roller coaster platform dozens of feet in the air just from trying to jump over his opponent's attack.
224* InformedAttribute:
225** For the first time in many years, Rising Hopper's jumping power is ''not'' this trope. Zero-One frequently displays a degree of superhuman leaping skills in regular combat that most of the Heisei Riders reserved near-exclusively for when delivering a Rider Kick. In this regard he's closer to the Showa Riders, who more commonly exhibited similar jumps, but with the benefit of modern special effects.
226** Biting Shark's official stats focus on its proficiency in deep-sea combat, but this is not what it's developed for in the show, and its debut fight takes place in water that's barely ankle-deep. Emphasis is instead placed on its multitude of bladed weapons and their utility against opponents trying to restrain Zero-One.
227** Breaking Mamoth, Aruto's MiniMecha form, was designed to protect people from large-scale disasters, effectively making it a rescue robot of sorts. The only times Aruto ever uses it is to combat the Magia, which are usually one-on-one fights in an open area.
228* JackOfAllStats: Early on, Zero-One's main strength is his versatility through various form changes, in contrast to Vulcan's [[GlassCannon firepower]] and [[MightyGlacier brute strength]] of Vulcan or Valkyrie's [[FragileSpeedster speed]] and quick reflexes. Once the upgrade train starts rolling and Valkyrie is left behind, Zero-One becomes the new FragileSpeedster by comparison to the other Riders at his strength level.
229* LethalJokeCharacter: Aside from its goofy impressions, Hopping Kangaroo can prove to be a helpful form as it gives Zero-One good punching power and agility as well as being able to summon [=HumaGear=] allies to help him out in battle for different situations.
230* LightningBruiser: Zero-One's progressively more advanced Hopper Keys play this role to the rest of his forms. Each is the strongest form in every regard of any Rider when it first appears, but gradually falls into being the new baseline for performance as stronger threats appear.
231* LogicalWeakness:
232** As amazing as Shining Hopper's ability to change attacks in an instant via {{Flash Step}}ping is, it won't matter if the opponent is either fast enough to react to the sudden changes or tough enough to endure the attacks outright, both traits that Thouser possesses. However, the more powerful strength and abilities from [=MetalCluster=] Hopper are able to overpower Thouser with ease.
233* MadeOfIron: Quite literally. Zero-One [=MetalCluster=]'s body is composed of Hiden Metal, a theoretical material originally conceived by Hiden Intelligence that can freely change its hardness, plasticity, and density, making it incredibly good armor.
234* MidSeasonUpgrade: From Rising Hopper to Shining Hopper, Shining Assault Hopper, and then [=MetalCluster=] Hopper.
235* MightyGlacier: Breaking Mammoth obviously qualifies due to being a MiniMecha, and thus extraordinarily powerful but also a giant target. Of Zero-One's more basic forms, Freezing Bear possesses the thickest armor and highest degree of raw physical strength.
236* MiniMecha: Essentially what Breaking Mammoth is. It's a mecha that Zero-One can use when fighting giant opponents like the Gigers.
237* MythologyGag:
238** Zero-One has a similar name and theme to [[Series/KamenRider the very first Kamen Rider]], as the original was named "Ichigou" ("#1") and also patterned after a grasshopper.
239** His simplistic design also shares similarities to the design of Series/KamenRiderKuuga, the first Kamen Rider of the Heisei Era.
240* NewPowersAsThePlotDemands: The Hiden Intelligence satellite is capable of fabricating entirely new Progrise Keys to help counter enemy tactics. #3 implies, however, that the Keys are actually being ''recreated'' rather than invented, and that Korenosuke took them from Daybreak Town during or after the event that destroyed the city.
241* PainfulTransformation: Hellrising Hopper doesn't simply slap itself onto Aruto like other forms do. Rather, the form is made via the Ride Model ''fusing with him'', resulting in the armor actually growing out of his body. Unlike S, who has a similar transformation sequence as Kamen Rider Eden, Aruto is in utter agony during the process. The fact that Hellrising Hopper is driving him insane does not help matters.
242* PestController: Under the Ark's control, [=MetalCluster=] Hopper evolves on the AttackDrones of Shining Assault Hopper by having ''the entire suit'' be made out of [[TheSwarm a swarm of locusts]] that can reshape themselves into any form the Ark wishes and possess enough destructive power to defeat a Raider within seconds. This power is lost when Aruto retakes control, as the swarm is trapped in the Progrise Hopper Blade.
243* PhlebotinumBreakdown: An engineered version. #23 begins with Aruto discovering that the [=MetalCluster=] Hopper Key had some kind of effect on the Zero-One Driver that makes it not authorize any of his normal Progrise Keys anymore. This means that at the moment, Aruto's only choices are to use the highly dangerous and unstable [=MetalCluster=] Hopper form or to abandon being Zero-One entirely.
244* PlayingWithFire: It's in the name of Flaming Tiger. This form gives Zero-One flame powers and he can use the ports of his Tiger Gauntlet's palms to release streams of flames and enhance the tip of the claws to make them hotter.
245* ThePowerOfFriendship: Hopping Kangaroo allows Zero-One to summon a [=HumaGear=] that he saved and he can learn special moves based on their occupation. When the chosen [=HumaGear=] does an action, Zero-One learns and does it with them.
246* ThePowerOfHate:
247** The view inside the Ark and later a direct analysis of the [=MetalCluster=] Hopper key makes it abundantly clear that the [=MetalCluster=] Hopper form is powered by this, specifically the Ark's hate. It is later replaced by ThePowerOfFriendship from all the [=HumaGears=] Aruto has helped between #1 and #24.
248** Hellrising Hopper isn't much better than [=MetalCluster=] Hopper, as it slowly drives Aruto insane the longer he uses it.
249* PowersDoTheFighting: As [=MetalCluster=] Hopper, during its first appearance, the Ark barely moves in a fight thanks to its metal locust drones who attack for it.
250* RapidFireFisticuffs: Hopping Impact allows Zero-One to deliver a barrage of punches at high speeds.
251* RedAndBlackAndEvilAllOver: Hellrising Hopper is more or less a red and black version of Shining Assault Hopper and is as powerful as it is menacing. Downplayed in that, since the person using it is Aruto, it's more a case of a darker RedIsHeroic.
252* RedEyesTakeWarning: Normally inverted, as Zero-One's primary forms all have red eyes aside from [=MetalCluster=] Hopper, a berserk form that has ''green'' eyes. However, in moments of extreme anger, Shining Assault Hopper's chestpiece can switch from its usual blue to a glowing red as the Ark half of the form threatens to overpower the Zea half.
253* SinisterScythe: Breaking Mammoth features two Graingots, tusk-like scythes that Zero-One can use as weapons. When not in use, they're stored on the Mammoth Breast. In his first battle using it, he demonstrates the ability to steal the identical weapons from the chest of a Giger.
254* SpannerInTheWorks: In ''Real x Time'', Aruto attempts to destroy the Hellrising Hopper Progrisekey while its inside the Zero-One Driver so as to prevent S from using it and complete his plans. Sadly for Aruto, the Progrisekey's influence and S' interference prevents him from doing just that.
255* SpeedEchoes: Zero-One in Shining Hopper form creates digital after-images when using his speed powers.
256* StealthPun: Due to being homophones in Japanese, Aruto's last form can be both Realizing Hopper and Re-Rising Hopper, both its own thing and a power-up of Rising Hopper.
257* SuperSpeed: When using the Rising Impact finisher in Rising Hopper form, Zero-One gains a temporary speed boost to perform the Rider Kick finisher in rapid motion. When using Shining Hopper form, Zero-One is given a permanent speed boost that he can use freely and he goes even ''faster'' when using the Shining/Shining Mega Impact finisher. Once Shining Assault Hopper is fully powered up, Zero-One's speed cranks up '''''even further!'''''
258* SwordBeam: By using a Full Charge in Attache Mode and then switching it to Blade Mode, Zero-One can use a Kaban Strash that unleashes a wave of energy from his sword. The Progrise Hopper Blade also has this ability by launching metal spiked waves that form from the blade. And when combining both swords together into a DoubleWeapon, Zero-One can create large energy waves to detonate the metal spiked waves.
259* TaughtByExperience: Initially, Zero-One started off as UnskilledButStrong, relying on his various forms to stay in a fight. As he gains more battle experience, he eventually becomes skilled enough to fight ''in his base form'' against much stronger opponents without using any of his [[SuperForm super forms]] until he needs to strike a decisive blow against the enemy.
260* ThrowingYourSwordAlwaysWorks: Zero-One in Shining Assault Hopper form can throw his Authorise Buster.
261* TookALevelInBadass:
262** Despite Thouser being virtually stronger than Rising Hopper in every way, the latter form manages to push Gai back and puts up an even fight before Aruto decides to switch to [=MetalCluster=] Hopper. Keep in mind that Rising Hopper is Zero-One's base form, meaning Aruto managed to push Gai back not through a difference in power, but rather a difference in ''combat prowess'' like Horobi before him.
263** Rising Hopper receiving an upgrade in the form of Realizing Hopper by way of [[spoiler:Soreo Hiden and the Zero-Two Driver]]. While it is weaker than Zero-Two, Realizing Hopper is strong enough to match Horobi's Ark-Scorpion.
264* TronLines: Zero-One's black undersuit has red lines going through it.
265** Shining Hopper's, and by extension Shining Assault Hopper's, undersuit replaces the red lines with gold ones. Fitting for a form that uses ''brightness.''
266* WeaponSpecialization: Each of Zero-One's major forms has a weapon associated with it, though he can use the weapons in other forms if he wants:
267** Rising Hopper and other basic forms have the Attache Calibur, a CoolSword that transforms from a briefcase. By inserting a Progrise Key into the slot at the bottom, he can infuse the energy from the Progrise Key into the sword to enhance its state.
268** When using Shining Hopper or Shining Assault Hopper, Zero-One wields the Authorise Buster, a MixAndMatchWeapon that can switch between axe and blaster modes.
269** [=MetalCluster=] Hopper gains the Progrise Hopper Blade, a sword that can use [=MetalCluster=] Hopper's Cluster Cells to create sharp edges to slash with or fire. It also doubles as a HealingShiv that exists in opposition to the Ark's malice, capable of restoring Magia to [=HumaGear=] form without needing a prepared backup. It can be combined at the hilt to the Attache Calibur to create a DoubleWeapon.
270* TheWormThatWalks: The Ark takes this form as [=MetalCluster=] Hopper, as the armor is composed of metal locust drones that constantly swarm on and off the undersuit.
271
272[[/folder]]
273
274[[folder:Tropes exclusive to him as Zerozero-One]]
275
276!!!Tropes exclusive to him as Kamen Rider Zerozero-One
277[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/kr01_zerozero_onerisinghopper.png]]
278 [[caption-width-right:210:''Force Rise!''\
279'''''Rising Hopper!'''''\
280[[AC:''A jump to the sky turns to a Rider Kick. Break Down.'']]]]
281* AwesomeButImpractical: Zerozero-One's raw stats are somewhat superior to Zero-One's base form, and it can temporarily gain the same SuperSpeed as Shining Hopper by using a finisher. However, the extra armor plates weigh the suit down and hinder Aruto's fighting style, and more importantly the Force Riser is excruciating to use, making it an inferior option in every regard the moment Zero-One acquires Shining Hopper.
282* ClippedWingAngel: Like Kamen Rider Joker or Drive Type Super Dead Heat, Zerozero-One is a kitbashed emergency form that was used only because Zero-One's regular powerset isn't available. The transformation itself is visibly agonizing, and Zerozero-One lacks Zero-One's array of tools and more powerful forms.
283* DarkIsNotEvil: Although it is a Force Riser-based form and shares Horobi and Jin's aesthetics, Aruto is still heroic nonetheless.
284* FlawedPrototype: While the Rising Hopper Progrise Key is still the final product, the [=ForceRiser=] that Zerozero-One uses is a modified prototype Driver that was never meant for human use, and it shows between the lack of weapons and the continual HeroicRROD it inflicts on the wearer.
285* FinishingMove: Zerozero-One has two finishers, depending on how many times he's pulled the Force Executor:
286** '''Rising Dystopia''': After pulling the Force Executor once, Zerozero-One gains the ability of SuperSpeed to match Ichi-Gata's own super speed.
287** '''Rising Utopia''': After pulling the Force Executor twice, Zerozero-One jumps up and delivers a glowing green energy-covered Rider Kick.
288* ForceAndFinesse: Aesthetically, Zerozero-One's heavy armor appears to emphasize the use of brute strength compared to Zero-One's sleek and lightweight design. In practice, Zero-One is both stronger ''and'' faster than Zerozero-One.
289* FragileSpeedster: Zerozero-One's Rising Dystopia allows it to run at high-speeds akin to [[Series/KamenRiderKabuto Kabuto's Clock Up]], but it's [[ClippedWingAngel neither strong nor sturdy]].
290* LightningBruiser: By [=ForceRiser=] standards, Zerozero-One managed to keep up with Ichi-Gata despite its ClippedWingAngel status.
291* LoopholeAbuse: Another Zero-One's alteration of history prevents Aruto from transforming using his real Driver, but the Force Riser that existed before the point when history was altered isn't affected. Plus, it allows him to become what basically and technically is a ''different'' Rider. As in, he just lost his Zero-One power, but nothing stops him from becoming Zerozero-One instead.
292* PainfulTransformation: Aruto screams and contorts in agony the first few times he changes into this form.
293[[/folder]]
294
295[[folder:Tropes exclusive to him as Zero-Two]]
296
297!!!Tropes exclusive to him as Kamen Rider Zero-Two
298[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/kr01_zero_two.png]]
299 [[caption-width-right:210:''Zero-Two Rise!''\
300'''''Road to glory has to lead to growin' path to change! One to two!'''''\
301[[AC:''Kamen Rider Zero-Two!'']]\
302''It's never over!'']]
303* AllYourPowersCombined: Instead of having all the powers of all the Progrise Keys in the series, Zero-Two takes all of the various Hopper forms and puts them together. [[SuperPowerLottery It has an improved version of Ichi-Gata's energy scarf, the speed from previous Hopper forms, predictive abilities of Shining Hopper, and the strength and defensive power from Hiden Metal armor of Metal Cluster Hopper.]] Thanks to the Progrise Hopper Blade, it can also make Cluster Cell constructs just like Metal Cluster Hopper can.
304* BishonenLine: In contrast to previous Rider SuperMode forms, which tend to be their most complex form design wise, Zero-Two is simply exactly what its name would suggest: a sleeker, more advanced version of Zero-One's base form with red and silver parts in contrast to the far busier and spikier Shining Hopper, Shining Assault Hopper, and Metal Cluster Hopper.
305* BroughtToYouByTheLetterS: The Zero-Two Driver has a big red "2" on its front in its inactive state, while the "scarf" on Zero-Two's neck is formed from the number "02".
306* CombatClairvoyance: Similar to Zero-One Shining Hopper and Shining Assault Hopper, Zero-Two can calculate the opponent's next moves and counterattack accordingly, but at speeds that make previous forms look like they're moving in slow motion. [[AllThereInTheManual The equipment list for each form]] states that Shining Hopper tests 25,000 scenarios per prediction, while Zero-Two tests ''2 trillion''.
307* ContrastingSequelMainCharacter: Zero-Two provides an interesting contrast for pretty much the ''entire'' Heisei era final form design. The vast majority of Heisei Riders' final forms are much more heavily armored (bordering on over-designed at times) and [[ChromeChampion have lots of gold and/or silver accents]]. On the other hand, Zero-Two simply looks like a modified version of Zero-One's ''first'' form with a few different color accents.
308* DiscardAndDraw: Ark-Zero confiscates the Zero-One Driver, only for Aruto, Is, and Zea to collectively design the Zero-Two Driver in its place.
309* FlashStep: Zero-Two is capable of moving ''extremely'' fast, to the degree that he can assault the target from multiple angles in the blink of an eye.
310* FinishingMove: '''Zero-Two Big Bang''': Zero-Two performs a series of high-speed kicks covered in yellow and red energy. The final kick will project a giant "02" the instant it connects with the target and creates a galaxy spiral as the enemy explodes.
311* FusionDance: A variation. Basically, Satellite Zea's A.I. is working with Aruto directly instead of Aruto's consciousness being sent to Zea.
312* ManOfKryptonite: Various aspects of the suit are designed for the expressed purpose of countering Ark-Zero. His hands are designed explicitly to counter the Ark's liquid metal form and he's designed to not only be stronger, but to have the processing power to out predict the Ark's own and thus counter it's most powerful aspect. This is best shown by the fact he's capable of [[spoiler:physically tearing Ark-Zero out of its hosts.]]
313* MasterOfAll: Stats-wise, Zero-Two outmatches all of Zero-One's previous LightningBruiser forms. It's faster than Shining Hopper and Shining Assault Hopper, and stronger than [=MetalCluster=] Hopper; it can take blows from Ark-Zero that would've decimated any other Rider, and is capable of staggering Ark-Zero with simple punches and kicks.
314* MidSeasonUpgrade: Unlike past Final Forms, which are basically ultimate upgrades of the same Rider, the show ditches that in favor of following the Franchise/{{Gundam}}-style of obtaining upgrades (where the hero transfers from his old unit to a new, superior one). Here, Aruto transfers from Zero-One to Zero-Two. He is also the first lead Rider to do this.
315* MythologyGag:
316** Just like Zero-One, Zero-Two has a similar name and theme to the {{deuteragonist}} of [[Series/KamenRider the very first series of the franchise]], as the original was named "Nigou" ("#2") and also patterned after a grasshopper, with a suit featuring red gloves and heavier silver accents. In fact, one of the promotional images shows him performing Nigou's transformation pose, albeit mirrored. It culminates in the ''REAL×TIME'' movie, where [[spoiler:Is inherits the Zero-Two belt to fight alongside Aruto, effectively becoming the new Double Riders (complete with a "#1 of Skill, #2 of Power" dynamic).]]
317** As a final form, it harkens back to [[Series/KamenRiderKuuga Ultimate Kuuga]] and [[Series/KamenRiderAgito Shining Agito]], the first Final Forms, in many ways. Though the Zero-Two Driver is treated as an entirely new belt, visually and functionally, it's just the Zero-One Driver with a new faceplate like the Rising Arcle and the Dragon's Nail-equipped Altering, though a special Progrise Key is still used. Similarly, like Ultimate and Shining themselves, as mentioned above, Zero-Two's design is still primarily visually similar to its base form, slightly more armored without sacrificing the original sleek look, rather than a complex and often very busy design like other Final Forms.
318* OutOfFocus: Because of the Covid required plot changes to the show which lead to Aruto not using it very much [[spoiler:and Is later getting it and using it in it's most recent prominant appearances while Aruto instead was regulated to Zero-One]] Zero-Two is probably one of the least focused on Rider Final Forms in recent history. Despite being Aruto's official Final Form it more or less got lost in the shuffle of all the forms he has and most of it's merchandise [[spoiler:features the Is version (which has a more feminine build and is placed in her "Secretary pose") instead.]]
319* RedIsHeroic: This form has the color red as a more predominant feature when in comparision to Zero-One, with those parts in particular paying homage to the first Kamen Rider of the franchise.
320* ScarfOfAsskicking: Similar to Ichi-Gata, Zero-Two also generates a scarf made out of red energy called Zero-Two Streamer.
321* SuperMode: Despite being counted as a separate Rider, Zero-Two is still considered as Zero-One's Final Form since it follows most tropes common with it, such as appearing in either 2nd half or last third/quarter of the series and usually, the strongest in the user's arsenal in the TV series. It's reinforced with [[Series/KamenRiderDecade Decade ]] [[Series/KamenRiderZiO Complete Form 21]] having Zero-Two as the Final Form card[[note]]The primary criteria of which form is considered the Final Form, with capital F, is generally the toys, primarily the form's TransformationTrinket being released in the show's final quarter and being interactable with the primary DX belt. Though the Zero-Two Driver is treated as a separate belt in-universe, it really is just the Zero-One Driver with an attachment plate that was originally released as a separate add-on packed with the Zero-Two Progrise Key. Thus, Ark One below is not treated as Zero-One's official Final Form, as the Ark Driver 1) is a Premium Bandai item released months ''after'' the end of the show, thus it isn't necessarily merchandise for the kids anyway, and 2) actually is a separate belt that has no interaction with the base Zero-One Driver.[[/note]].
322* SuperSpeed: The speed of Zero-Two exceeds all forms of Zero-One and Zerozero-One, moving so fast that he instantly reappears after each of his high speed attacks. Kamen Rider Ark couldn't even keep up with his calculations and gets worn out as a result.
323* SuperiorSuccessor: Zero-Two was designed by Aruto after the Zero-One forms reached their maximum power; wanting to surpass his grandfather in his own way, Aruto designed Zero-Two as the culmination of humans and AI working together.
324[[/folder]]
325
326[[folder:Tropes exclusive to him as the Ark's Successor''' (Unmarked Endgame Spoilers)''']]
327[[caption-width-right:350:https://static.tvtropes.org/pmwiki/pub/images/thumbnail_image3_3.jpg]]
328
329-->''"I will never forgive you."''
330-->-- Aruto's grim declaration against Horobi after him killing Is.
331
332After Horobi murders Is in cold blood, Aruto is pushed past his breaking point. Through As's manipulations, he willingly accepts the remnants of the Ark's power, becoming Kamen Rider Ark-One in order to enact revenge on Horobi.
333----
334* AntiHero: Aruto may be on a mission to kill Horobi using the power of malice incarnate, but that is his only goal. When facing his former allies, he would rather avoid fighting them altogether. And when that isn't an option, he merely resorts to non-lethally incapacitating them. When he kills Jin by accident, he starts to have a panic attack.
335* BeingEvilSucks: Despite grasping the power of Ark-One with open hands, it's quickly made apparent that wielding it traumatizes and horrifies Aruto, as by the episode's end he's left sobbing while As gives him FalseReassurance.
336* BreakTheCutie: Aruto begins as a man who simply wants to make people smile, then endures a tremendous amount over the course of the series. Ultimately Is's death at Horobi's hands proves to be his breaking point, leaving him a distraught wreck who willingly becomes Ark-One in the name of vengeance.
337* BrokenPedestal: The entire reason Aruto's vengenful crusade is such a problem in the first place. Having spent the entire show championing the cause of [=HumaGears=] even when everyone else turned on them, Aruto embracing the power of Ark and giving into his negativity risks losing all the goodwill the good guys had built up all show, since it potentially proves Horobi's point that even the greatest of humans is not immune to hatred and if Aruto Hiden will throw everything away for the sake of vengence on one of them then no human can be trusted and risks causing the whole war Horobi's trying to start in the first place.
338* ContrastingSequelProtagonist: The LightIsNotGood Ark-One is this to the DarkIsEvil [[Series/KamenRiderZiO Oma Zi-O]], as both are the forms the main characters have and eventually take on that symbolizes their status as a FallenHero and both are formed by the protagonist willingly embracing dark powers born from witnessing the death of a loved one; Geiz for Sougo and Is for Aruto. However, Oma Zi-O, [[AllYourPowersCombined which combined the powers of all Heisei Riders]], originally belonged to Sougo's [[FutureMeScaresMe villianous future self]] which the present Sougo sought to avoid thoroughout his series, while Aruto, who has directly been fighting the Ark and its minions, becomes its host [[RevengeBeforeReason for revenge]] by using ThePowerOfHate before and during his time as Ark-One. How they are each dealt with is also notable: Sougo never fully succumbed to the power of Oma as proven when he willingly gave up the power to repair all of the worlds, while Aruto goes through an HeelRealization and allows Ark-One to be destroyed to overcome his malice.
339* CruelMercy: When Fuwa becomes Ortheros Vulcan to stop him from going after Horobi, Aruto opts to become Zero-Two instead of Ark-One, pulverizes him until the suit can't take it anymore and explodes in his face. Merciful, but hardly a painless way to spare him.
340* CycleOfRevenge: Horobi killing Is leads Aruto to become Ark-One in retaliation, leading to Jin dying in an attempt to protect Horobi. Of course, Horobi was already planning to KillAllHumans at that point, so all Aruto did was make Horobi focused on him instead.
341* EvilCannotComprehendGood: It's strongly implied that while using the suit, Ark-One's face gem gives him the equivalent of a lobotomy and completely ruins his ability to feel doubt, regret, or even happiness as long as it's active. The closest the Ark Driver will get to using Aruto as a meat puppet is to simply go for his brainwaves and invoke this trope. [[UnstoppableRage It's good enough]].
342* FallenHero: Zig-zagged. After losing Is, Aruto willingly becomes Ark's vessel and turns from an AllLovingHero to a vengeful, UnscrupulousHero as Ark-One, and keeps pressing forward in his revenge quest even after switching to Zero-Two. At the same, it's shown frequently that he regrets his actions and, aside from [[KillAllHumans Horobi]], Aruto only fights the other Riders when they attack him first. Full averted in the finale thanks to his pep-talk with his dad. Aruto lets go of the hatred he has for Horobi and decides to fight him out of catharsis - not revenge.
343* {{Foreshadowing}}: Hints that Aruto would become the Ark's final host as Kamen Rider Ark-One are dropped throughout the series:
344** In ''[[TheMovie Kamen Rider: Reiwa The First Generation]]'', Aruto is forced to use the [=MetsubouJinrai=] [=ForceRiser=], the tool associated with the Ark's most prominent followers. Aruto also remains the only human being in the series to utilize one.
345*** Of that same film, [[TheHeavy Will]]/[[ShadowArchetype Another Zero-One]]'s attitude can be considered a mirror reflection of Aruto's mindset during his time as Ark-One, with how they are each given their corrupt power (by Finis and As respectively) a direct parallel to each other. It should also be noted that the outfit Aruto wears when he first becomes Ark-One is the very same one he wore when he first met Will.
346** Throughout the show, Aruto has been using the Ark's power and technology more and more frequently. First was Shining Assault Hopper (commandeering the Ark's Assault Grip to use with the Shining Hopper Key). Shortly after that, he is forcibly given Metal Cluster Hopper, giving Aruto a direct connection to the Ark that he had no choice but to use despite its power consuming him, ''willingly'' using it when it was his only option despite the risks attached.
347** During the Workplace Competition arc, it's been demonstrated that when exposed to or feeling enough malice, ''both'' [=HumaGears=] and humans can transform into the MonsterOfTheWeek, coming under the Ark's influence as a result, and Aruto's own anger while using Shining Assault Hopper makes its eye glow the same red as the Ark's main lens on its satellite.
348* GoodIsNotNice: While he's still fighting to stop a genocidal terrorist, Aruto has lost most of the fetters he once had and is much more willing to employ force than he was before, even against his former friends when they get in the way, though he opts to disable their ability to transform rather than seriously harm them.
349* GoodIsNotSoft: Just because he cares about his former allies does not mean he will go easy on them, as he easily crushes Gai, Yua, and Fuwa with a disturbing amount of ease and disabling their ability to transform into Riders. This later takes a disturbing dive in #44 when he brutalizes Fuwa after Fuwa gets in his way as Ortheros Vulcan.
350* HeroicBSOD: Horobi killing Is sends Aruto into overwhelming despair, to the point where he '''willingly''' becomes Kamen Rider Ark-One.
351* HeelFaceRevolvingDoor: Briefly became an AntiHero for the last four episodes until Soreo showed up to break him out of his Ark-induced funk.
352* IdiotBall: For no coherent reason, he chose to keep using the Ark-Driver even after he realized As was manipulating him to become another Ark, even though his Zero-Two Driver was the strongest in the setting and more than enough to defeat Horobi.
353* ItsPersonal: He disables the transformation devices of Gai, Fuwa, and Yua when they get in his way and warns them that his only problem is with Horobi.
354* IveComeTooFar: When Naki demands to know if Aruto has given up on all of his ideals, this is what Aruto tells them in response.
355* ALighterShadeOfGray: AntiHero though he may be, he's still only out for {{Revenge}} against the murderer of his best friend and avoids fighting others when he can. Horobi by contrast was a terrorist whose goal would have required [[FinalSolution untold amounts of death and destruction]] and who was willing to [[{{Hypocrite}} murder members of his own kind]] if they displeased him, even before he became Ark-Scorpion.
356* MyGodWhatHaveIDone: Aruto experiences several of these as Ark-One.
357** Breaks down in tears after de-transforming from Ark-One in #42, heartbreakingly stating this:
358---> '''Aruto''': I am...the Ark...
359** Has a severe panic attack when he accidentally destroys Jin in #43.
360** This comes to a point in #44, where he's so conflicted and lost on what to do that he asks Zea for answers.
361* NotBrainwashed: Isamu and Yua initially assumed Aruto was possessed by the Ark, only to learn he willingly became Ark-One and kept his free will.
362* OOCIsSeriousBusiness: PlayedForDrama. After his gigantic HeroicBSOD in #42, Aruto drops the cheerful persona he's had for most of the series, opting for a cold, vengeful outlook after Is's death. This forces ''everyone'' in the main cast to stop him from killing Horobi. He even gives an unsettling DeathGlare after he detransforms from Ark-One, and it only gets worse from there as his fighting style slowly degenerates into unrefined brutality.
363* PayEvilUntoEvil: Delivers an absolutely brutal beating to Horobi as Ark-One in retaliation for him killing Is. He later beats up Orthus Vulcan after Fuwa offers him NoSympathy for Is's death and tells him not to fight Horobi, who vengeance aside was on the verge of leading a crusade to wipe out humanity.
364* RoaringRampageOfRevenge: Deconstructed. Despite insisting that his only objective is to kill Horobi, ''Zero-One'''s endgame illustrates just how much chaos that single-minded focus can wreak, starting with all of the other human Riders losing their powers by his hand, escalating to Jin dying as collateral damage to save Horobi, and only getting worse from there as As takes advantage of the situation to make both Aruto and Horobi cause even more destruction by getting into a fight with each other.
365* SanitySlippage: Even as he insists that he's only doing the bare minimum required to deal with his obstacles, it becomes increasingly apparent that Aruto is losing his grip on reality, hallucinating the inevitable future where he and Horobi remain as Ark Riders and delivering a brutal assault on Fuwa to force him out of Ortheros Vulcan. He regains himself in the finale thanks to Soreo's digital ghost giving him a much-needed pep-talk that helps him regain his composure and remember the ideals that led him to start his journey.
366* SlasherSmile: Sports a subdued but decidedly horrifying one when he accepts the mantle of Ark-One from As.
367* StartOfDarkness: Is's death drives him to such despair that he takes the Ark-One Progrisekey from As and becomes Kamen Rider Ark-One.
368* TemporarilyAVillain: Willingly became Ark's host and an unscrupulous AntiHero to get back at Horobi for killing Is. [[GetAHoldOfYourselfMan Soreo snapped him out of it.]]
369* ThisIsUnforgivable: As his quote indicates, Aruto tried again and again to reach out to Horobi, but in the end Is's death proved to be too much for him to forgive and he became Ark-One for the sole purpose of avenging her.
370* UnscrupulousHero: Although he's no longer the AllLovingHero he once was, Aruto's malevolent impulses are focused on Horobi, leaving him with no wish to harm others unless he's forced to. When he's confronted by Fuwa, Yaiba and Gai on his way to Daybreak Town, he initially tries to get past them and continue on his way without a fight. Once violence becomes unavoidable, he disables them by rendering their Drivers inoperable and leaves them otherwise unharmed.
371* VillainBall: A rare case where it's TheHero who grabs this. There would have been very few issues if Aruto had destroyed Horobi using the Zero-Two Driver. Instead, he chose to use the Ark-Driver instead and kept using it even after it became obvious As was manipulating him.
372* ViolenceIsTheOnlyOption: Deconstructed. With Is's death, Aruto discards all attempts in trying to get through to Horobi and becomes hellbent on destroying him if it means justice for Is. However, all this really does is ignite a CycleOfRevenge that only gets worse when Jin dies to stop him from destroying Horobi, leading Horobi to the exact same fate Aruto caught himself in. Played straight later when Aruto defeats Horobi Ark-Scorpion by beating him up, but not killing him.
373* WalkingSpoiler: Knowing that Ark-One is Aruto spoils perhaps the biggest twist in the entire series and the major plot point of the final arc.
374
375!!!Tropes exclusive to him as Kamen Rider Ark-One
376[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/kr01_ark_one_9.png]]
377[[caption-width-right:210: Singurize! Hakai. Hametsu. Zetsubō. Metsubōseyo.[[note]]Taste destruction. Know ruin. Feel despair. Experience extinction.[[/note]] Conclusion one.]]
378* AwfulTruth: Ark-One's sole mind-altering function is to clear Aruto's mind of his doubts and regrets for becoming its host by any means - but it doesn't change the fact that he is now running from the truth that he pretty much ''is'' the Ark now. Sure enough, the first time he disengages the suit, he snaps back to reality and is hit with so much realization and confusion he starts crying uncontrollably.
379* BecameTheirOwnAntithesis:
380** Aruto, a kindhearted person who loves [=HumaGears=] to no end, willingly becomes the embodiment of the AI trying to corrupt them out of a cocktail of pent-up resentment, fear, and despair towards Horobi, a [=HumaGear=] that he spent a large chunk of the series trying to redeem. His brief smile upon seeing the Ark-One key only serves to further drive home the point that he's NotBrainwashed, the only mind-altering processes of the Ark-One suit merely serving to toughen his new villainous resolve.
381** For a more straightforward example, Aruto's acceptance of a villainous TransformationTrinket that should brainwash him but doesn't for the sake of simple {{Revenge}} eerily brings to mind Will/Another Zero-One, his ''literal'' antithesis.
382* TheBerserker: Despite the mind-altering affects suggesting that Aruto is in perfect zen, Ark-One is still a Rider harnessing [[ThePowerOfHate malice]] and acts very similar to [[CallBack [=MetalCluster=] Hopper]].
383* DeadlyUpgrade: Much like Assault Wolf, Ark-One isn't designed with the safety or comfort of its operator in mind. This prevents Aruto from immediately exacting his revenge against Horobi, as his body gives out from the strain and forces him to retreat moments before he can finish Horobi off. However, he gains a much finer control over it in #43, gaining a clearer grasp of Ark-One's abilities and overcoming the strain at an impressive pace.
384* EvilCounterpart: Ark-One is this to both Zero-One and Zero-Two. The suit's appearance is a twisted version of Rising Hopper. The Ark-One key is similar to the Zero-Two key, in that it needs no authorization to be used, and upgrades the Rider to their highest evolution.
385* FinishingMove:
386** '''Perfect Conclusion''':
387*** Perfect Conclusion Learning 5: By pressing the button on top of the Driver five times before pressing the inserted Progrisekey, Ark-One emits a stream of red smoke containing kanji with negative meanings, then reabsorbs them and unleashes a very powerful AreaOfEffect explosion.
388*** Perfect Conclusion Learning End: By pressing the button on top of the Driver ten times before pressing the inserted Progrisekey, Ark-One delivers a Rider Kick powerful enough that just the act of extending his leg for the kick inflicts damage on the surrounding scenery.
389* {{Foil}}: Tragically ironic to Zero-One itself. Zero-One uses the concept of ThePowerOfFriendship to protect [=HumaGears=] from the malice of the Ark while Ark-One uses that very same [[ThePowerOfHate malice]] to destroy Horobi, the very [=HumaGear=] he tried to redeem. Even their respective fighting styles are different from one another. Zero-One focuses more on finesse, evading attacks while maintaining balance between offense and defense. Ark-One solely focuses on pure power, effectively making him both TheJuggernaut and TheBerserker at the same time, ignoring the damage he sustained while relentlessly in pursuing his target until they are throughly defeated.
390** It is also one to Horobi once Ark Scorpion is acquired; Ark-One is a false form of Zero-One accessed by using the Ark's power, while Ark Scorpion is an Ark-empowered Horobi accessed by using a false form of the Zero-Two Driver and Zero-Two Progrisekey.
391* {{Irony}}: Aruto is the final evolution of the Ark, the one thing he despised so much throughout the series. To twist the knife further, his nemesis Horobi receives a jury-rigged version of Zero-Two's equipment after he experiences the first major consequence to his blind RoaringRampageOfRevenge.
392* TheJuggernaut: Quite ''literally'' walks through any attack thrown at him without missing a single step. If anything actually gets in his way, he'll grab and incapacitate them with a swift blow by any means before moving on.
393* LeakingCanOfEvil: In #44, Zero-Two makes a human scream similar to the Ark's constant ambient screeching once finished transforming, and Ark-One replaces Zero-Two in some shots of the ensuing fight, symbolizing that being Ark-One is more about Aruto's state of mind than what suit he's wearing.
394* LightIsNotGood: Covered in white plating to mimic the brightly-colored Zero-One, but is founded on the principles of targeted hatred rather than idealism.
395* LimpAndLivid: How Aruto tends to move while in the Ark-One suit, mostly due to the traumatic emotions driving him while he uses it.
396* MindOverMatter: Displays a degree of this in #43, as he flings a bunch of signs without much trouble.
397* OminousVisualGlitch: On the splash screen that appears when he uses Perfect Conclusion, the characters writing out the finisher's name rapidly flickers between katakana and random kanji, as if Ark-One's corrupting effect is ''[[TheFourthWallWillNotProtectYou directly affecting the viewer's screen]]''.
398* OneWingedAngel: {{Downplayed}} in theory but ultimately played straight. [[AllThereInTheManual On paper]], Ark-One is only marginally stronger than Ark-Zero and still leagues below Zero-Two. Unfortunately, this still makes him ''far'' more powerful than everybody who '''isn't''' Aruto, and Ark-One can more than make up the difference by unleashing the [[ThePowerOfHate pure, concentrated malice]] constantly being collected in the Ark-One Progrisekey from the now [[DespairEventHorizon heartbroken]] Aruto.
399* ThePowerOfHate: Ark-One has the ability to concentrate the malice collected by its Progrisekey and unleash it as a wave of pure destructive force, on a level that surpasses even Ark-Zero. This is so potent that Ark-One corrupts the ground beneath him just by ''standing on it.''
400* ScareChord: The Ark-One Progrisekey very loudly blares one whenever it's opened.
401* SuperiorSuccessor: Is explicitly stated to surpass Ark-Zero's capabilities. During its proper debut, Yaiba observes that the previous Ark has never displayed the level of power that Ark-One has.
402* TranquilFury: According to the parts list for the Ark-One suit, Aruto is implied to be in a state of perfect zen to an impossible degree rather than trauma, due to the faceplate silencing his benevolent qualities and mentally sheltering him in a manner described as a calming experience.
403* WhiteAndRedAndEerieAllOver: Compared to the Ark-Zero suit, the Ark-One suit features white plating over the upper body, with streaks of red as well.
404[[/folder]]
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