History Fridge / KamenRiderZeroOne

* Zero-One's name is a callback to Kamen Rider 1, as 1, read in Japanese as "Ichigou", translates to "Number One".
* Zero-One's main color being yellow may be strange...Till you realize the Yellow parts actually glow in the dark, which turns them green and thus matching Kamen Rider 1's main color even more.

** Vulcan shares his name with a gatling style rotary canon, the M61 Vulcan.
** Valkyrie however shares her name with ammunition for assault rifles, 224 Valkyrie.

** Adding to this, in Zi-O summer movie Over Quarter, Zero-One's cameo is actually a dream Sougo had about being replaced. But considering Sougo's [[TimeMaster massive time powers]] which includes [[RealityWarper creating new timelines from his dreams]], it's implied that Sougo might have created Zero-One's timeline just like he did for Kikai in his series.
* Yes, the text blurbs at the end of every jingle might be a bit Narm, but between them, and the initial activation sound, which is revealed to be that key's unique ability, and you realize that each Progrise Key tells you A) What it's useful for, and B) How best to do so. Hopper suggests a Rider Kick, Falcon suggests attacking while airborne, you get the idea.
* A meta-example. The meaning behind the name "Reiwa" is "Beautiful Harmony". The story of Zero One is about humans coexisting with A.I., or in other words, living in ''harmony''.
* Zero One's sword looked like a briefcase. Fitting for a CEO.
* The Berotha Magear in the 1st episode is created from a comedian Humagear. Berotha's design is based on a praying mantis, specifically ''Kujiberotha teruyuki''. A species named after a Japanese actor who is also known for his ''comedian'' roles, Kagawa Teruyuki.
* The Hiden Zero-One Driver containing a built-in Tutorial serves to not only explain its functions to the user but possibly guide them through the battle.
* All three of the currently known/leaked TransformationTrinkets have different levels of announcement for the Progrise Keys, showing how the users of each device relate to Hiden Intelligence.
** The Zero One Driver announces the jingle, name of the Key, and the text-to-speech, showing how Hiden 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 Shot Riser announces the name of the 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 Keys as a soldier's tool to destroy the machines, hence it only uses the mechanical text-to-speech portions.
** [[spoiler: The Force Riser only announces the Keys, showing that they're entirely antagonistic to Hide Intel and only care for the Keys as much as they can cause destruction.]]

* 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 Shotriser's recoil can be shown [[BlinkAndYouMissIt knocking him back a bit.]] It likely means he's using a higher caliber weapon than he's been 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 Shooting Blast. It's little wonder why his arm needs time to heal after all of that.
* Isamu's main form is Wolf, while Yua is Cheetah. Their contrasting personality is basically Dog vs Cat.

* Let's sink this for a moment about Magias. It can be said that it can turn any [=HumaGear=] nearby into Combat Magia, and they will never be the same again, and they will try to attack you. These [=HumaGear=]s are very much like normal people. The first three episodes are bad enough, but what if a Magia turns a [=HumaGear=] mook, for let's say, elementary school teacher, or babysitter, is something to be the subject of nightmares.
** Adding to this is the fact that the requirement to use a Zetsume Risers is for a [=HumaGear=] to GrewBeyondTheirProgramming, e.g starting to develop a personality and thoughts of their own, or in other words, ''start having a soul,'' is full of horrifying implications that just as they are starting to really feel, only for some lunatic to wipe it away. It's also implied that the Zetsume Keys hold this data that's fed to the Ark. Somehow they made the robot version of ''eating their souls''.
* Some Humagears are modeled after real people and while there might be laws against making a Humagear look like people who are still alive, it’s implied that people can have Humagears made to look like a deceased loved one. Not only does make it so they can’t move on from their loved one’s passing, it can also make them experience the pain of losing them again if an accident happened. Or worse, they’re turned into a Magia...

** Adding to this is the fact that the requirement to use a Zetsume Risers is for a [=HumaGear=] to GrewBeyondTheirProgramming, e.g starting to develop a personality and thoughts of their own, or in other words, ''start having a soul,'' is full of horrifying implications that just as they are starting to really feel, only for some lunatic to wipe it away. It's also implied that the Zetsume Keys hold this data that's fed to the Ark. Somehow they made the robot version of ''eating their souls''.

* Let's sink this for a moment about Magias. It can be said that it can turn any [=HumaGear=] nearby into Combat Magia, and they will never be the same again, and they will try to attack you. These [=HumaGear=]s are very much like normal people. The first three episodes are bad enough, but what if a Magia turns a [=HumaGear=] mook, for let's say, elementary school teacher, or babysitter, is something to be the subject of nightmares.

* Let's sink this for a moment about Magias. It can be said that it can turn any [[=HumaGear=]] nearby into Combat Magia, and they will never be the same again, and they will try to attack you. These [[=HumaGear=]]s are very much like normal people. The first three episodes are bad enough, but what if a Magia turns a Humagear mook, for let's say, elementary school teacher, or babysitter, is something to be the subject of nightmares.

* 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 Shotriser's recoil can be shown [[BlinkAndYouMissIt knocking him back a bit.]] It likely means he's using a higher caliber weapon than he's been 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 Shooting Blast. It's little wonder why his arm needs time to heal after all of that.

* Fuyu'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 Shotriser's recoil can be shown [[BlinkAndYouMissIt knocking him back a bit.]] It likely means he's using a higher caliber weapon than he's been 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 Shooting Blast. It's little wonder why his arm needs time to heal after all of that.

* Jun'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 Shotriser's recoil can be shown [[BlinkAndYouMissIt knocking him back a bit.]] It likely means he's using a higher caliber weapon than he's been 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 Shooting Blast. It's little wonder why his arm needs time to heal after all of that.

* The Magia are all based on extinct animals, symbolizing their goal to render humans extinct.

** [[spoiler: The Force Riser only announces the Keys, showing that they're entirely antagonistic to Hide Intel and only care for the Keys as much as they can cause destruction.]]

* The Hiden Zero-One Driver containing a built-in Tutorial serves to not only explain its functions to the user but possibly guide them through the battle.

* The Berotha Magear in the 1st episode is created from a comedian Humagear. Berotha's design is based on a praying mantis, specifically ''Kujiberotha teruyuki''. A species named after a Japanese actor who also have played a ''comedian'' role, Kagawa Teruyuki.

* The Berotha Magear in the 1st episode is created from a comedian Humagear. Berotha's design is based on a praying mantis, specifically ''Kujiberotha teruyuki''. A species named after a Japanese actor who also have played a ''comedian'' role, Kagawa Teruyuki.

* Zero One's sword looked like a briefcase. Fitting for a CEO.

* Zero One's sword looked like a suitcase. Fitting for a CEO.

* A meta-example. The meaning behind the name "Reiwa" is "Beautiful Harmony". The story of Zero One is about humans coexisting with A.I., or in other words, living in ''harmony''.

* The "O1" in the logo represents him being the first Reiwa Rider, Second Lieutenant (since it is also military themed) and the birth year of the main actor.
** It also is a callback to Kamen Rider 1, as 1, read in Japanese as "Ichigou", translates to "Number One".
** It's also a numeric continuation from its predecessor, ''Series/KamenRiderZiO''. Zi-O is themed after clocks, and clocks have 12 numbers on them. What comes after 12 on a clock? The number 1.

* A Fridge Horror and Fridge Brilliance one in one: the Rider after Zi-O is about dealing with [[RidiculouslyHumanRobots AI]] going berserk and we never really got an origin for Kikai and the Humanoise.

* Yes, the text blurbs at the end of every jingle might be a bit Narm, but between them, and the initial activation sound, which is revealed to be that key's unique ability, and you realize that each Progrise Key tells you A) What it's useful for, and B) How best to do so. Hopper suggests a Rider Kick, Falcon suggests attacking while airborne, you get the idea.

** Yes, the text blurbs at the end of every jingle might be a bit Narm, but between them, and the initial activation sound, which is revealed to be that key's unique ability, and you realize that each Progrise Key tells you A) What it's useful for, and B) How best to do so. Hopper suggests a Rider Kick, Falcon suggests attacking while airborne, you get the idea.

** Adding to this, in Zi-O summer movie Over Quarter, Zero-One's cameo is actually a dream Sougo had about being replaced. But considering Sougo's [[TimeMaster massive time powers]] which includes [[RealityWarper creating new timelines from his dreams]], it's implied that Sougo might have created Zero-One's timeline just like he did for Kikai in his series.

* a Fridge Horror and Fridge Brilliance one in one: the Rider after Zi-O is about dealing with [[RidiculouslyHumanRobots AI]] going berserk and we never really got an origin for Kikai and the Humanoise.

* a Fridge Horror and Fridge Brilliance one in one: the Rider after Zi-O is about dealing with [[AI RidiculouslyHumanRobots]] going berserk and we never really got an origin for Kikai and the Humanoise.

* a Fridge Horror and Fridge Brilliance one in one: the Rider after Zi-O is about dealing with AI ridiculously human robots going berserk and we never really got an origin for Kikai and the Humanoise.

** It also is a callback to Kamen Rider 1, as 1, read in Japanese as "Ichigou", translates to "Number One".

** It also is a callback to Kamen Rider Ichigo, as Ichigo translates to "Number One".

* The "O1" in the logo represents him being the first Reiwa Rider, Second Lieutenant (since it is also military themed) and the birth year of the main actor.

* The "O1" in the logo represents him being the first Reiwa Rider and the birth year of the main actor.