History Fridge / KamenRiderZeroOne

** The A.I.M.S. [=ShotRiser=] announces only the name of the Progrise Key and the text-to-speech, showing that while they also fight the Magia, they don’t have a positive relation with Hiden Intelligence, and only see the Progrise Keys as a soldier’s tool to destroy the machines, hence the shortened announcement.

** The [=CycloneRiser=] with Rocking Hopper announces the Key’s name and “Type-1,” showing it is a prototype belonging to an apparent enemy of humans. Played with in that when it's used in the Zero-One Driver, the Key's full transformation announcement starts with “The sole hero of j-j-j-justice!” and ends with “Kamen Rider will fight to protect humanity. Type-1”. It was ''meant'' to be a heroic power, but the [=CycloneRiser=] was corrupted by Ark.

* Isamu’s problems with opening his Progrise Keys may actually be explained by how the Progrise Keys are supposed to be used - both the Hiden Zero-One Driver and the A.I.M.S. [=ShotRiser=] have an additional step (holding the Progrise Key over the Authorizer, and pushing it into the Rise Slot ''before unfolding'') that makes the Driver announce “Authorize” before the more elaborate sounds. Something that Isamu’s been skipping over all this time.

* As [=HumaGears=] are essentially humans in robotic bodies, when they are forcefully converted into Magia, they are basically stripped of their '''humanity''' to become '''monsters''' against their will.

* #12 stated that Wazu was the previous assistant of Aruto’s grandfather. There’s an [[ThemeNaming established naming theme]] for the Hiden Intelligence [=CEOs=]’ assistants: Wazu (Was), Izu (Is), and the assistant in the ''Film/KamenRiderReiwaTheFirstGeneration'' is named Will, and by #42, it was inferenced that their names are also the reference to different phase of Aruto himself.

** '''White''': Aruto views Kamen Rider as a mean of creating a future where [=HumaGear=] and humanity can coexist together.

*** Fuwa is a full-blown Gray as he vehemently believed all [=HumaGear=] is evil after a DarkAndTroubledPast occurred to him and views Kamen Rider as a mean to destroy all of them but started to have [[ALighterShadeOfGrey a different opinion of them]] after being saved by them and began acting accordingly without the reckless thinking of him.

* By observing Jin's characterization before and after his revival, it makes much more sense if you think about it. Jin's PsychopathicManchild tendencies are influenced by his connection towards the Ark through the use of the [=ForceRiser=], which '''''forces''''' him to serve Metsuboujinrai.net; after his revival, he acts more mature and independent, while getting his handa on the [=SlashRiser=] can be interpreted as him '''''slashing'''''/severing his ties from the Ark while maintaining his loyalty to Metsuboujinrai.net.
* Aruto's decision of starting a new company, Hiden Manufacturing after his resignation as CEO of Hiden Intelligence is actually much more sense. By inheriting the title of CEO from his grandfather Kurenosuke, Aruto basically inheriting Kurenosuke's vision of wanting [=HumaGear=] and humanity to coexist together, a feat that Aruto never managed to fullfil after ZAIA's hostile takeover over Hiden Intelligence. By creating his own company while maintaining the same policy, Hiden Manufacturing basically served as a SpiritualSuccessor to Hiden Intelligence, continuing Kurenosuke's legacy.

* The existence ofZea and Ark were actually symbolic foil to each other in many different ways:

* The way the ARK-Zero transforms seems like nosense until you pay attention: The shapes seen coming out of the sludge are the Zetsumerisekeys' Lost Models, which then are vaporized and turned into the suit. Exactly the same way we use the extinct animals (mostly dinosaurs) which have become petroleum and then refined by humans to harness their energy (for engines or heat).

* Why is Rushing Cheetah’s ability ''Dash'' and not ''Speed''? It is [[TruthInTelevision a reference to real-life cheetahs]], [[FragileSpeedster who are the fastest known land animals, but have very low stamina.]]
** So who does have Speed for its ability? None other than the Lord of Speed himself, Kamen Rider Kabuto.

* The MetsubōJinrai [=ForceRiser=] requires the Progrise Key/Zetsumerise Key to be inserted while closed, with it being [[IncrediblyLamePun forced open]] by the driver’s activation. [[MeaningfulName It’s aptly named.]]

** The MetsubōJinrai [=ForceRiser=] only announces the Key’s name and a distorted robotic “Break Down,” showing that they’re directly opposed to Hiden Intelligence and only care for the Keys as much as they can cause destruction. It plays the text-to-speech portion of some keys (notably Rising Hopper when Aruto uses one to transform out of desperation), but drowned out by “Break Down”.
** The [=ZetsumeRiser=] only announces “[=ZetsumeRise=],” because the Magia are just interchangeable monsters that want to make all humanity go extinct. Unusually, it does announce the text-to-speech portion of Progrise Keys, but not Zetsumerise Keys.
** The ZAIA [=ThousanDriver=] plays the full jingle of Amazing Caucasus and Triceratops, which has no text-to-speech (instead ending with ”Presented by ZAIA” and ”I am the President!”, respectively), because Thouser ''acts'' heroically but is a self-aggrandizing competitor of Zero-One and Hiden Intelligence. The belt doesn't properly work at all with most Keys, only announcing ”(name of key)'s ability!” instead of any of the normal transformation phrases.
** The [=CycloneRiser=] with Rocking Hopper announces the Key’s name and “Type-1,” showing it is a prototype belonging to an apparent enemy of humans. (When used in the Zero-One Driver, the same key has a much longer text-to-speech portion, with “Type-1” being only the very last part)
** The [=RaidRiser=] has the same announcement style as the A.I.M.S. [=ShotRiser=], because it’s used by enemies of [=HumaGears=]. The Key's text-to-speech announcement is partially drowned out by sirens and static sound effects.
** The [=ArkDriver=], like the Zero-One Driver, uses the full jingle, Key name, and text-to-speech portions, but its own voices are distorted and sinister. Ark was created by the same man who made the Zero-One Driver, and so the [=ArkDriver=] a twisted reflection of it. In the series, it's only used with keys whose voices are also distorted and sinister (Ark-One, Ark Zero-One, and Thousand Ark).

** The Hiden Zero-One Driver announces a jingle, the name of the Progrise Key, and the text-to-speech, showing how Hiden Intelligence created the technology and Zero-One is the intended user of it, as well as how he embodies the entire spirit of the tech being used as a force for good and a positive image (hence the light-hearted jingles), but also as a tool to fight the Magia (the text-to-speech).
** The A.I.M.S. [=ShotRiser=] announces the name of the Progrise Key and the text-to-speech, showing that while they also fight the Magia, they don’t have a positive relation with Hiden Intelligence, and only see the Progrise Keys as a soldier’s tool to destroy the machines, hence it only uses the name announcement and the mechanical text-to-speech portions.
** The MetsubōJinrai [=ForceRiser=] only announces the Key’s name and “Break Down,” showing that they’re directly opposed to Hiden Intelligence and only care for the Keys as much as they can cause destruction.
** The [=ZetsumeRiser=] only announces “[=ZetsumeRise=],” because the Magia are just interchangeable monsters that want to make all humanity go extinct.
** The ZAIA [=ThousanDriver=] plays the full jingle of Amazing Caucasus, which has no text-to-speech, because Thouser ''acts'' heroically but is a competitor of Zero-One and Hiden Intelligence.
** The [=CycloneRiser=] announces the Key’s name and “Type-1,” showing it is a prototype belonging to an apparent enemy of humans.
** The [=RaidRiser=] has the same announcement style as the A.I.M.S. [=ShotRiser=], because it’s used by enemies of [=HumaGears=].

** [[spoiler:He was being used as Naki's vessel and working for Gai without being aware of it.]]

* One would think that Kamen Rider Metsuboujinrai is another case of the strong new thing being shown for its movie, until one thinks about it: The way its created implies its basically a weaponized Rider Model (the hardlight animals that become Zero-One's armor). Which in turn explains why its so strong, as the viewer has seen the sort of damage a Rider Model can do (Mostly Rising Hopper when jumping around but also the other Models helping Aruto before becoming the armor).

* Can also be considered FridgeHorror as well: the Rider after Zi-O is about dealing with [[RidiculouslyHumanRobots AI]] going berserk. We never really learned how exactly the Humanoise came into existence, did we?

* So far up to Episode 8[[note]](Episode 9 features a Giger instead, and notably, Episode 10 onwards appears to be devoted for plot instead of making a reference, however, the theming could still return in the future.)[[/note]], each of the Magia are tied in some way to the victim they were created on, or the episode they are in.
** The '''[[SlayingMantis Berotha Magia]]''' in the 1st episode is created from a comedian [=HumaGear=]. Berotha’s design is based on an extinct praying mantis species, specifically ''Kujiberotha teruyuki''. A species named after a Japanese actor who is also known for his ''comedian'' roles, Kagawa Teruyuki.
** The '''[[ReptilesAreAbhorrent Kuehne Magia]]''' in the 2nd episode, who was created from a delivery man [=HumaGear=], is based on an extinct flying reptile, the ''Kuehneosuchus''. Being able to fly and stick on walls would be really useful for a delivery man.
** The '''[[BoxingKangaroo Ekal Magia]]''', also in the 2nd episode, was created from a security guard [=HumaGear=]. ''Ekaltadeta'' is an extinct species of marsupial. Marsupials carry their children with them, ''guarding'' them from threats.
** The '''[[TentacledTerror Neohi Magia]]''' in the 3rd episode is based on ''Neohibolites'', an extinct genus of squid, and was in an episode featuring a sushi chef [=HumaGear=] making squid sushi.
** The '''[[BatOutOfHell Onycho Magia]]''' in the 4th episode is based on ''Onychonycteris'', an extinct species of bats. “Bats” sounds similar to “Bus” when both are pronounced in Japanese. The [=HumaGear=] this Magia is created from is a bus driver.
*** Another Onycho Magia appeared in the 6th episode, this time created from a taxi driver. However, it only appears shortly before getting destroyed, as its only purpose was to steal and deliver a Progrise Key to Jin. It is likely that the production team for the series chose Onycho Magia due to Kamen Rider Jin debuting in the same episode and using the Flying Falcon Progrise Key, which also debuted in the 4th episode.
** The '''[[DrillTank Vicarya Magia]]''' in the 5th episode is based on ''Vicarya'', an extinct genus of snails, thus it features drill-like shells. Which also happen to resemble the tip of a pen or a brush used for drawing and coloring manga, which is what the episode’s plot is centered on.
** The '''[[FrogMen Gaeru Magia]]''' in the 6th episode is based on ''Rheobatrachus'' (also known in Japan as “Ibukurokomorigaeru”), an extinct genus of frog that is known to raise their young by carrying them inside their body to protect them. Frogs are also an animal known for their voice. These two facts match the theme of the episode, which is a protective parent raising a voice-acting [=HumaGear=].
** The '''[[MammothsMeanIceAge Mammoth Magia]]''' and '''Dodo Magia''' in the 7th episode are tied to a more simple but also slightly more obscure theme within the episode: ''Hot and Cold''. Mammoth is an animal that lived in cold places, while Dodo is an animal that lived in a hotter tropical island. The theme is reinforced by the two auxiliary Progrise Keys that Zero-One uses in this episode, ''Flaming Tiger'' and ''Freezing Bear'', not only having hot and cold powers, but also using an animal commonly found in hotter tropical/savanna regions (tiger), and an animal that lives in the Arctic (polar bear). Also, Kobe, the [=HumaGear=] featured in the episode, is referred as hot-blooded, yet dresses fully in blue, a cold color.
** The '''Dodo Magia''' returns in the 8th episode as the only Magia in the episode, however, it still ties into a theme of the episode, as the Dodo Magia is an ''assassin dressed in black'', while Mashiro-chan, the [=HumaGear=] featured in the episode, is referred to as an ''angel dressed in white''.

* Isamu’s arm being in a sling in the end of episode 2 makes sense, and not just with him forcing the Progrise Key to open up. In the first episode, the A.I.M.S. [=ShotRiser=]’s recoil [[FreezeFrameBonus can be seen]] [[RecoiledAcrossTheRoom knocking him back a bit.]] It likely means he’s using a higher caliber weapon than he’s used to and probably had minimal training, thus probably not handling it completely right. And not only did he use it one handed after stressing his arms out to open the Shooting Wolf key, but he fought an extended length with it, even using a [[FinishingMove Shooting Blast]]. It’s little wonder why his arm needs time to heal after all of that.

* Why Aruto [[HurricaneOfPuns cracks more bad puns]] while transformed than not transformed is explained in episode 1, where we see that the Hiden Zero-One Driver gives the wearer the same mental processing speed as an AI supercomputer. Of course Aruto would use it to come up with, and then make jokes.

*** However, by episode 10, it seems they have successfully forced full control over the animals.
* We finally know one reason why Horobi and Jin removed their [=HumaGear=] Modules aside from “liberating themselves from human control” - it’s also to prevent being detected. Their rider forms lack earpieces too.

* By episode 12, we learned that Wazu was the previous assistant of Aruto’s grandfather. There’s an [[ThemeNaming established naming theme]] for the Hiden Intelligence [=CEOs=]’ assistants: Wazu (Was), Izu (Is), and the assistant in the ''Film/KamenRiderReiwaTheFirstGeneration'' is named Will, and by episode 42 we learned that their names are also the reference to different phase of Aruto himself.

* Episode 24 explains a lot about the series:

* In episode 25, there are differences of definition of Kamen Rider towards [=HumaGear=] and subtle implications of [[TheGoodTheBadAndTheEvil White, Gray and Black Conflict]] from them:

** Gai as TheManBehindTheMan and GreaterScopeVillain, orchestrated multiple incidents for something grander for his own gain bear minds to [[Series/KamenRiderBuild Evolt]] playing the same role albeit to much higher destructive level.

* The way the ARK-Zero transforms seems like nosense until you pay attention: The shapes seen coming out of the sludge are the Zetsumerisekeys' Lost Models, which then are vaporized and turned into the suit. Exactly the same way we use the extinct animals(mostly dinosaurs) which have become petroleum and then refined by humans to harness their energy (for engines or heat).

* Why is the motif of [[spoiler:Kamen Rider Lucifer]] a [[DemBones skeleton]] with hollowed-out details, compared to Eden's much more vibrant armor and motif of a tree? [[spoiler: Because while S was a man whose heart was in the right place despite being severely misguided in his plans, Bell knows ''exactly'' what he is doing - albeit at the cost of any regard for ethics, morals, or even his own sentiments, essentially ''hollowing out'' all the moral agency of S's original plans]].

* We find out in episode 6 that Jin is a [=HumaGear=] created by Horobi. And that much like any of the others, he can be reprogrammed, as when Jin begins to show signs of doubt, Horobi slaps the MetsubōJinrai [=ForceRiser=] on him, returning him to his “typical” self. Where’s the Fridge Horror in this? Well, how do we know this is the first time that Horobi has done this to Jin?

* In Episode 9, Jun Fukuzoe decides that the rampage at the hospital must be stopped as MetsubōJinrai.net hacks more [=HumaGears=], and thus insists his President shut all the [=HumaGears=] in the hospital down at once. It doesn’t last for long, but imagine how many people were left without care during the incident.
* Aruto’s hesitance to attack or let anyone attack the Crushing Buffalo Raider in Episode 18 makes a horrifying amount of sense when one takes into account the fact that most all of the riders’ finishing moves ''tear [=HumaGears=] to pieces''. Aruto’s panicked responses show that he’s afraid of what [[{{Gorn}} they could do to a far less durable human.]]

* In episode 40, Aruto asks Izu to run "billions of simulations" to awaken the power to create the Zero-Two Driver. This may mean ''she had to watch Aruto die billions of times.'' Small wonder she started crying!

** Forcing it open forces the Key to shift into “authorized” mode and activates it for full use, much like how the MetsubōJinrai [=ForceRiser=] force-activates Progrise Keys. Also, now being able to easily force it open with one hand implies he ''broke the lock'' on it.

** Horobi and Gai represent opposite ends of the spectrum, HumaGear and Human respectively. Their suits when transformed are Purple with Yellow/Gold eyes and Gold with with Purple eyes. This shows their allegiance in contrast to one another. Additionally Horobi's suit uses his color motif as the undersuit with silver-black armor while Gai's has a gold and black undersuit with silver armor.

*** Zea represent the '''Light''', located far above the sky and much closer to the Sun, receiveing the light from itwhile Ark's name as if derived from '''Dark''', located at the very bottom of the lake, utterly devoid from the light.

** The '''[[MammothsMeanIceAge Mammoth Magia]]''' and '''[[DumbDodoBird Dodo Magia]]''' in the 7th episode are tied to a more simple but also slightly more obscure theme within the episode: ''Hot and Cold''. Mammoth is an animal that lived in cold places, while Dodo is an animal that lived in a hotter tropical island. The theme is reinforced by the two auxiliary Progrise Keys that Zero-One uses in this episode, ''Flaming Tiger'' and ''Freezing Bear'', not only having hot and cold powers, but also using an animal commonly found in hotter tropical/savanna regions (tiger), and an animal that lives in the Arctic (polar bear). Also, Kobe, the [=HumaGear=] featured in the episode, is referred as hot-blooded, yet dresses fully in blue, a cold color.

* The Ark AI, as terrifying as it is, was never truly completed. It was suposed hold the singularity data of all Zetsumerise Keys and those of MetsubouJinrai.net. But Jin's ressurection as Next-Gen Humagear meant that Azu couldn't get his Singularity data. So in-series the Ark (as Ark-Zero)was operating at at least 75% of its Intended capablities. How scary is that? a completed Ark could have foreseen the betrayal of the members of Metsuboujinrai from the begining and rigged Breaking Mammoth to self-destruct with Raiden inside, securing the Satellite Zea hardware from where it could have destroyed humankind with impunity.

** Rising Hopper and all other basic forms use liquid armor under metal armor.

** Rising Hopper and all other basic forms use liquid metal armor under metal fiber mesh, soft metal, and harder metal.

* The Kamen Rider Zero-One suit shows a noticeable technological progression which you can especially see in the supplementary materials.
** Rising Hopper and all other basic forms use liquid metal armor under metal fiber mesh, soft metal, and harder metal.
** Shining Hopper and Shining Assault Hopper incorporate biomechanics into their designs.
** Metal Cluster Hopper is made from {{Nanomachines}} with phase transition control properties.
** Zero-Two uses the technology from Metal Cluster Hopper with the addition of a built-in [[QuantumMechanicsCanDoAnything quantum computer]].
** Realizing Hopper uses HardLight technology.

* By episode 12, we learned that Wazu was the previous assistant of Aruto’s grandfather. There’s an [[ThemeNaming established naming theme]] for the Hiden Intelligence [=CEOs=]’ assistants: Wazu (Was), Izu (Is), and the assistant in the ''Film/KamenRiderReiwaTheFirstGeneration'' is named Will, Their name are also the reference to different phase of Aruto himself.

** He ''will'' be sunk into villainy, just like ''​'Will'''​.

** He ''will'​' be sunk into villainy, just like '''Will'''.

* By episode 12, we learned that Wazu was the previous assistant of Aruto’s grandfather. There’s an [[ThemeNaming established naming theme]] for the Hiden Intelligence [=CEOs=]’ assistants: Wazu (Was), Izu (Is), and the assistant in the ''Film/KamenRiderReiwaTheFirstGeneration'' is named Will.
** Their name are the reference to different phase of Aruto himself.
*** He ''​was'' as quirky as '​''​Wazu'''.
*** He ''​is'' wholeheartedly believed in the coexistence of human and Humagear, just like'​''Izu​''​'.
*** He '​'will'​' be sunk into villainy, just like '​''Will​''​'.