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Trivia / Kamen Rider Zi-O

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  • Actor Allusion: Or rather, Suit-Actor Allusion, for Geiz's suit actor Yuya Nawata. In the OOO Arc, Geiz gets the Genm Armor, which is based off Kamen Rider Genm, Yuya's first in-suit role as a Kamen Rider.
  • Acting for Two:
    • Keisuke Watanabe portrays both Black and White Woz.
    • Sou Okuno pulls triple duty as Prime Sougo, Sougo from 3 days in the Future ("Gaim Arc"), and Dark Sougo ("Ryuki Arc").
    • Takamasa Suga reprises both Shinji Kido and Dark Shinji in the "Ryuki Arc".
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    • Yuichi Nakamura reprises his roles as Kyosuke Kiriya in the "Hibiki Arc" and Yuto Sakurai in the "Den-O Arc" respectively. Lampshaded in episode 39 when Sougo mistook Yuto for Kiriya.
    • Ayaka Konno portrays both Ora and the alternate Paradox Roidmude's disguise.
  • Actor-Inspired Element: Heure and Ora’s names were selected by their actors.
    • Sougo being in high school was decided upon when So Okuno was cast.
    • Daiki returning was based on a suggestion by Masahiro Inoue.
  • Awesome, Dear Boy: The reason why Satoshi Matsuda/Ren Akiyama is back for Rider Time Ryuki, a spin-off of Zi-O based on Ryuki is because of his wish to reprise his role after seeing multiple past actors of last Rider seasons return.
  • Casting Gag:
    • While Rikiya Koyama has voiced Big Bad-types before, his first scene in this show involves curbstomping waves of freedom fighters very similar to Joe the Haze.
      • He has also played a character whose main method of fighting involves manipulating time.
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    • This is not first time that Hideya Tawada played a shinobi in another series written by Kento Shimoyama.
    • Jingi Irie previously starred as the titular human-robot Kikaider from the recent Kikaider Reboot movie. The episode he premeres in is even called "It's Kikai! 2121", or in Japanese: "Kikaidā! 2121".
    • This is not the first time Amane Kurihara's actress, Hikari Kajiwara, guest starred as a Monster of the Week character. She was also previously Ritsuko Usaka/Altar Zodiarts.
    • Tomokazu Sugita has two cases: He's the voice actor of the Kivat family in Kamen Rider Kiva, as the Kiva arc is Ginga's debut episode. Additionally, his voice actor is also the titular hero of Ultraman Ginga, as well as the fact that both characters are from the future.
    • This is not the first time Yumiko Shaku gets to be in Kamen Rider either - she was previously a more minor character in Kamen Rider G, in contrast to being The Heavy here.
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    • Katsuhisa Namase (Junichiro Tokiwa) previously starred in Keibuho Yabe Kenzo, a TV series that had featured several Kamen Rider alumni as guest stars and lampshaded the everloving hell out of it by having every single aspect of their characters be a reference to their Rider role. Even better, several of those guest stars went on to appear in Zi-O itself alongside Namase.
  • Cast the Runner-Up: Woz's actor originally auditioned for the title character, but dropped out. The producers then called him again and was casted as Woz.
  • Dawson Casting: 17/24/28-year-old Yuko Kitajima/Another Kiva is played by 40-year-old Yumiko Shaku.
  • Descended Creator: Kamen Rider Barlckxs from the summer movie is played by ISSA, one of the singers of the show's opening and movie's namesake Over Quartzer.
  • "Do It Yourself" Theme Tune:
    • "Zi-O! King of time!" is sung by So Okuno.
    • "Future Guardian" Geiz' Leitmotif is sung by Gaku Oshida.
    • The theme for Rider Time: Shinobi "IZANAGI" is sung by Hideya Tawada.
  • Fan Nickname:
    • Another Riders - Bizarro RidersExplanation , Kaijin RidersExplanation 
    • Sougo/Zi-O - Destroyer of Catchphrases/FinishersExplanation , 我が魔王~/"Waga Maō~"Explanation 
    • The new Woz suffered from this heavily to differentiate him from the original Woz, having been given names such as "New Woz" or "Another Woz"note . Eventually the official name stated on the TV-Asahi website is the In-Series Nickname "White Woz", while Woz himself is renamed as "Black Woz".
    • Geiz - 我が救世主~/"Waga Kyūseishu~"Explanation 
    • Another AgitΩ: At least on this very wiki, because Another Agito already existed in Agito's original series, and Another AgitΩ himself has the omega symbol (Ω) instead of an 'o' on the chest plate, he's called this in order to differentiate the two.
  • I Knew It!: Swartz was a very popular guess as the one who becomes Another Decade. Sure enough, episode 44 shows him become Another Decade.
  • Jossed: Not a theory specific to this show, but rather, one for the entire franchise, the Number theory. It's generally agreed that Decade, Double, OOO, and Fourze had a theme revolving around 1, 2, 3, and 4 respectively, but the theory also believed that it continued onwardsnote . Although the producer of Ex-Aid explicitly said that said series was based around the number 10, there was still a tiny bit of discussion during Build, but this series put the final nail in the coffin for the theory, since not only was this series (which, if the theory was true, would've been themed around 11) themed around the number 20 if it is supposed to be themed after a numbernote , but Shirakura explicitly stated it was a coincidence during the run of this series.
  • Meme Acknowledgement: As multiple fans began pointing out the similarities of both Geiz and Ren Akiyama, the series took note of this, with the latter's actor releasing a preview of himself in Geiz's costume, which was done for a scene in episode 3 of Rider Time Ryuki where Shinji mistakes Geiz for the just-deceased Ren.
  • Milestone Celebration:
    • Much like Kamen Rider Decade, this seems to be the one for the Phase 2 Heisei Kamen Rider series, as well as the Heisei era overall, being the 10th and 20th respectivelynote .
    • In terms of individual tributes, episode 21, the first episode of the Ryuki tribute shares the airdate (February 3) of the first episode of Ryuki itself.
  • Name's the Same:
    • The Monsters of the Week for this series are "Another Riders", distorted and monster-fied versions of Kamen Riders. Kamen Rider Agito already used both the name and the concept with Another Agito, a person who had the potential to become Agito but instead assumed a monster-like form because only one "true" Agito can exist at any given time. Zi-O's staff are reportedly trying to figure out how to handle this, and have suggested that they might just use the existing Another Agito suit as Agito's Another Rider, in which they ultimately did, albeit with relevant modifications.
      • Zi-O also has a form called "Trinity", the same name as one of Agito's. This comes full circle when their teamup features both of them using their Trinity Forms together.
    • Also, the name of the series has been compared to the names of Power Rangers Zeo and Kamen Rider ZO, with every joke you'd expect to be made about it.
    • Kamen Rider Ginga has the name of another galaxy-theme warrior from an another franchise. Incidentally an Milestone Celebration where the hero transforms into other Ultramen. And more hilariously both shares the same voice actor.
  • Prop Recycling:
    • Episode 11.5 reveals that the interior of Kujigojido has been decorated with assorted stuff from past seasons, like the wall clocks from Kamen Rider Build and Kamen Rider W.
    • The Decade Armor allows Zi-O to access previous Riders' Mid-Season Upgrade forms like RabbitTank Sparkling or Grateful Damashii. These forms use the original Rider costume's bodysuit, with the Ziku Driver and Decade Armor's helmet and chestplate on top of them.
    • The giant ornamental clock behind Black Woz during his narrating at the start and end of each episode is a repainted version of Kamen Rider Cronus's own giant ornamental clock from Kamen Rider Ex-Aid.
      • It later on becomes the giant clock in Zi-O Trinity's "cockpit" that indicates who is in control of the main body.
    • The Future Riders recycle and kitbash costumes from several past seasons. Most prominently, all of them use copies of the Ziku Driver painted silver and modified called the Mirai Driver to use different items as centerpieces instead of Ridewatches.
    • Kamen Rider Shinobi's costume is made with parts from Kamen Rider Dark Necrom with the shoulder armor and retooled Ride-Player helmet.
      • The mooks he fights against are the Dustards from Kamen Rider Fourze.
      • In the Rider Time Shinobi spin-off, his own secondary rider Kamen Rider Hattari's helmet and suit is retooled from Kamen Rider Dark Drive.
      • Also Yami Shinobi, The Big Bad of Rider Time Shinobi has his suit recycled from Another Shinobi an enforced version of this trope.
    • Kamen Rider Quiz's costume is a retooled Ghost helmet on a similarly retooled standard Ex-Aid rider body.
    • Kamen Rider Kikai's costume is a remodeled version of the Guardians helmet and armor suit. Unlike the previous two who uses parts of past riders his suit is a retooled Mooks suit. Fittingly, he's actually part of the Humanoise's ground forces who had a Heel–Face Turn, meaning he's actually an Elite Mook.
    • Kamen Rider Ginga’s helmet is retooled from Kamen Rider Mage's helmet and costume is a modified version of Kamen Rider Fourze Meteor Fusion States with Meteor's regular legs and feet.
    • Another AgitΩ costume uses the original Another Agito suit, and appears almost identical to it, there are a few minor differences such as the chest plate is labeled with the original Rider's name and the Another Rider's date of creation like other Another Riders, the Ank Point's color is changed to solid yellow with red accents, and the suit uses a new head with longer crests and a more distinct mouth with teeth.
    • Another Kiva's head is a redesign of the Bat Dopant's head.
    • Another Diend's costume is used by using both Chinomanako Diend Form and Another Decade.
    • Geiz Majesty's shoulder pads are retooled and repainted from Kamen Rider Zamonas, his helmet is repainted from from his normal helmet, and his chest armor is retooled and repainted from his WizardArmor.
  • Real Life Writes the Plot:
    • In general, this happens whenever one of the actors can't reprise their role due to scheduling conflicts. Usually, this happens because many of them has reached stardom, which ironically, is often due to their breakthrough role in Kamen Rider.
    • Episode 6.5 openly admits that the Fourze arc was hamstrung because both Souta Fukushi and Ryo Yoshizawa (Gentaro/Fourze and Ryusei/Meteor) couldn't reprise their roles because they were busy filming the live-action Bleach movienote . In order to patch the holes left by their absence, the arc was tied in with Faiz, aided by the fact that it's Faiz's 15th anniversary and both Kento Handa and Kohei Murakami (Takumi/Faiz and Kusaka/Kaixa) were available to return. There are still a few hints of the arc's original intentions, primarily that Another Fourze/Faiz is a Shadow Archetype for Ryusei. The writing staff was able to spin this to tie the plot in with Faiz by revealing that both Another Fourze/Faiz and the girl he's trying to save were members of the Ryusei School, turning the hints towards Meteor into a Red Herring.
    • Episode 9.5 lampshades that Kuroto Dan's appearance in the OOO tribute arc was due to Tetsuya Iwanaga's busy schedule only allowing him to return during the time they were filming the OOO arc, with the story written around this to involve him in the plot as Another OOO, as well as having the release of a Genm Ridewatch product campaign scheduled together with the release of OOO-related Zi-O products in November 2018 to accommodate this.
    • Episode 13.5 reveals the Ghost tribute arc was delayed due to Shun Nishime being busy with filming and stage play commitments, hence Zi-O's use of the Ghost Armor being rather late despite Geiz having the Ridewatch to begin with. When asked about the possibility of Ryoma Takeuchi returning for Drive however, Nishime/Takeru advised everyone not to talk about it.
    • Miho Kirishima/Kamen Rider Femme’s absence in Rider Time: Ryuki owes to her actress, Natsuki Katou, giving birth to her second child at the time it was being filmed. This is the reason Abyss (originally from Decade) is one of the 13 Riders in the new Rider War instead of Femme.
    • The Hibiki arc using Kyosuke instead of Hibiki or Asumu is likely due to this, with Hibiki's actor having been fired and blacklisted due to power-harassment allegationsnote , and the latter due to his actor retiring in 2018. Jouji Shibue wasn't able to reprise his role as Iori Izumi/Kamen Rider Ibuki either due to being busy filming on Kishiryu Sentai Ryusoulger. Kenji Matsuda didn't reprise his role as Kamen Rider Zanki, likely because Hibiki's history was not erased since Another Hibiki was created in 2019. As a result, Zanki remains dead.
  • Decade’s increased appearances from the Kabuto arc onwards were due to Masahhiro Inoue’s schedule being busy prior to this.
  • Role Reprise: Part of Sougo's quest involves meeting the past Riders; unlike Decade, he'll meet at least part of the original casts. In order of release, he meets:
    • Kamen Rider Build: Sento Kiryū/Kamen Rider Build, Ryūga Banjō/Kamen Rider Cross-Z, Kazumi Sawatari/Kamen Rider Grease, Gentoku Himuro/Kamen Rider Rogue and Misora Isurugi.
    • Kamen Rider Ex-Aid: Emu Hōjō/Kamen Rider Ex-Aid, Hiiro Kagami/Kamen Rider Brave, and Kuroto Dan/Kamen Rider Genm.
    • Kamen Rider Fourze: Chūta Ōsugi, Daita "Kong" Kondō and Chikao "Nezumi" Nezu.note 
    • Kamen Rider 555: Takumi Inui/Kamen Rider Faiz and Masato Kusaka/Kamen Rider Kaixa.
    • Kamen Rider Wizard: Kōsuke Nitō/Kamen Rider Beast.
    • Kamen Rider OOO: Eiji Hino/Kamen Rider OOO, Hina Izumi, Michal Minato/Kamen Rider Aqua, and Akira Date/Kamen Rider Birth.
    • Kamen Rider Gaim: Kouta Kazuraba/Armored Rider Gaim and Kaito Kumon/Armored Rider Baron.
    • Kamen Rider Ghost: Takeru Tenkujii/Kamen Rider Ghost, Makoto Fukami/Kamen Rider Specter, Shibuya, and Narita.
    • Kamen Rider Decade: Tsukasa Kadoya/Kamen Rider Decade and Daiki Kaito/Kamen Rider Diend.
    • Kamen Rider Den-O: Ryotaro Nogami and the Taros/Kamen Rider Den-O, Ownernote , Yuto Sakurai and Deneb/Kamen Rider Zeronos.
    • Kamen Rider Ryuki: Shinji Kido/Kamen Rider Ryukinote , Dark Shinji/Kamen Rider Ryuga, Daisuke Okubo, Ren Akiyama/Kamen Rider Knight, Goro Yura/Kamen Rider Zolda, Miyuki Tezuka/Kamen Rider Raia, Jun Shibaura/Kamen Rider Gai and Takeshi Asakura/Kamen Rider Ouja.
    • Kamen Rider Agito: Shouichi Tsugami/Kamen Rider Agitonote , Takahiro Omuro/Kamen Rider G3 Mild and Mana Kazaya.
    • Kamen Rider Blade: Kazuma Kenzaki/Kamen Rider Blade, Hajime Aikawa/Kamen Rider Chalice and Amane Kurihara.
    • Kamen Rider Hibiki: Tomizo Todayama/Kamen Rider Todoroki and Kyosuke Kiriya/"Transformed Kyosuke"/Kamen Rider Kyoki.
    • Kamen Rider Kiva: Jiro/Garulu/Kamen Rider Ixa (Proto Ixa - First User).
    • Kamen Rider Kabuto: Arata Kagami/Kamen Rider Gatack, Sou Yaguruma/Kamen Rider KickHopper and Shun Kageyama/Kamen Rider PunchHopper.
    • Kamen Rider Drive: Go Shijima/Kamen Rider Mach, Krim Steinbelt/Mr. Belt, Chase/Kamen Rider Proto-Drive/Mashin Chaser/Kamen Rider Chaser.
    • Kamen Rider Double: Katsumi Daido/Kamen Rider Eternal and Ryu Terui/Kamen Rider Accel.
  • Troubled Production: Scheduling and plotting the scripts around the returning alumni made production much harder than most Rider shows.
  • What Could Have Been:
    • Masaki Suda was unable to reprise his role as Philip in Heisei Generations FOREVER because his career had massively taken off, with his schedule reportedly being booked solid for the next two years. Which is a shame, because he reportedly said he would have loved to come back.
    • Oddly enough, neither was Renn Kiriyama able to reprise his role as Shotaro Hidari for undisclosed reasons, despite having reprised his role for multiple movies before and sharing the same sentiments with Suda.
    • Hiro Mizushima (Souji Tendou) posted on Instagram to say that he hadn’t been contacted about returning, but added that he does not view his time on Kamen Rider Kabuto as Old Shame, considering it the starting point of his career, expressing fondness for his cast- and crewmates, and hoping for success for Heisei Generations FOREVER.
    • Another Double was originally planned to have a human identity, but the idea was scrapped due to time constraints; producer Shirakura has said that he hopes they'll still get the opportunity to introduce and develop the character.
    • Natsuki Katou said that she would have gladly reprised her role as Miho Kirishima in Rider Time: Ryuki, but was pregnant with her second child (who was born around the time the mini-series was filmed) and thus was physically unable to return. Interestingly, this seemingly led Toei to opt to not use Femme at all (as opposed to use the rider but have someone else take on the identity, like they did with Scissors, Tiger, Imperer, and Verde), and instead use Abyss.
    • Although he did end up reprising the role in Rider Time Ryuki, Satoshi Matsuda expressed an interest in reprising his role of Ren Akiyama for the main show prior to the Ryuki arc filming. It’s possible that had Toei not been able to get Takamasa Suga or Kanji Tsuda back to reprise their roles as Shinji and Daisuke, Ren would’ve appeared in the TV series as well.
    • Producer Shirakura said around the beginning that he was going to contact Jo Odagiri to see if he could reprise his role. One must wonder that if he did return, if it was going to be for a tribute arc since Kuuga was the only Rider who did not get a tribute of any kind on the show (Den-O had its own arc and W and Drive combined their tribute with the Movie Riders arc and the final arc respectively).
    • Around the time of the OOO arc, images were released showing Zi-O MachArmor. However, Sougo didn't obtain the Mach Ridewatch until near the end of the series in Over Quartzer, by which point the use of individual Ridewatches had completely dropped off, meaning it never appeared outside those original pictures.
    • A toy catalog list reveals Tsukuyomi was supposed to become a Rider far earlier in the show’s run and even get a Rider Armor. The Rider Armor never appeared and she only got to be a Rider in the last two episodes.
    • After the series' run, storyboarder Seima Muto revealed three unused sketches of Another Riders for Cross-Z, Chalice, and Mach, which also implies possible scrapped plans for more secondary Riders to have their own Another Riders as well.
    • The Time Jackers were intended to have their own monster forms, but Shirakura vetoed this, saying that main villains being Recurring Bosses was something that Super Sentai already did better. Similarly, Tsukuyomi was meant to receive a monster form, but Shirakura instead suggested she become a Rider.
    • In a similar case to Ankh from OOO, Woz was originally intended to become the Big Bad at the end, but his chemistry with the rest of the heroic cast and popularity with the audience led to him remaining a Token Evil Teammate throughout the series, never making a full Heel–Face Turn.
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