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This is a partial character sheet for Kamen Rider Zero-One. Visit here for the main character index. Subjective trope and audience reactions should go on the YMMV page.

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ZAIA Enterprise

Presented by ZAIA!

A multinational technology megacorp with offices based around the world. One of its subsidiaries, ZAIA Japan, was involved with the production of prototype Humagears in the Daybreak incident. ZAIA Japan also acts as the main benefactor of A.I.M.S., supplying them with their equipment and Progrisekeys to fight MetsubouJinrai.net and the Magia, while also seeking to make use of the conflict to seize control of Hiden Intelligence.

In General

The Conspiracy: Part of ZAIA Japan’s underhanded tactics involves abusing their close working relationship with A.I.M.S., using Yua’s position within the organization, and resulting government authority to steal some of Hiden Intelligence’s more closely-guarded secrets such as the location of the President’s personal laboratory.
Evil Knockoff: Most of ZAIA Japan’s Rider-related products are directly plagiarized from Hiden Intelligence’s designs. It is most evident in the design of the Giger, which is obviously just Breaking Mammoth with a different head, but Thouser takes only a few more steps to hide being a direct copy of Zero-One.
Hoist by Their Own Petard: Their proposed solution to an outbreak of HumaGears being hacked en masse is the Giger, a gigantic mammoth-themed robot capable of hacking HumaGears en masse. While it’s supposed to have this feature to stop an outbreak by shutting the rogue machines down, no internal counter-hacking measure was implemented by ZAIA. This means it takes MetsubouJinrai.net all of fifteen minutes to hack one of the Gigers directly, at which point it not only produces a mass outbreak far beyond what they could have done alone but foils the Hiden security that did work on MetsubouJinrai.net’s own attempts. ZAIA Japan then proceeds to build even more Gigers without correcting the security flaw, this time giving Jin a small army of them to rampage with.
Hypocrite: ZAIA Japan spearheaded the campaign against HumaGears and artificial intelligence, yet their leader tries to abuse the Ark for his own benefits, and even manufactures Gigers, autonomous Humongous Mecha that makes them Humagear in all but appearance and sizes.
Meaningful Name:
If you combine “Zaia” and Ark, you get the Japanese word for “sins” (罪悪 Zaiaku), hinting at ZAIA Japan’s machinations behind the Ark turning to evil.
Predatory Business: ZAIA is an enormous multinational conglomerate and the way its Japan subsidiary orchestrates the sabotage of Hiden Intelligence to weaken them before a buyout makes it clear this isn’t the first time they’ve done so to get where they are. Their tactics include deliberately reprogramming the first Dodo Magia to have blue LEDs and recording it transforming to incite mass panic over the idea that an unhacked HumaGear could also go berserk.
Quality Vs Quantity: As shown in the cold opening of #17, ZAIA represents quantity; being a multinational technology conglomerate with office branches across the world, which is a stark contrast to Hiden Intelligence’s quality.

Gai Amatsu/Kamen Rider Thouser

See his page here for more details.

Yua Yaiba/Kamen Rider Valkyrie

Portrayed by: Hiroe Igeta (live), Satoshi Fujita (suit)

Gai’s
For her character tropes, see the

Gai’s direct subordinate and previously the technical advisor for A.I.M.S, she has since been reassigned back to ZAIA Enterprise Japan to directly assist Gai following the supposed downfall of MetsubouJinrai.net.For her character tropes, see the A.I.M.S. section.

Williamson Yotagaki (unmarked spoilers)

Williamson Yotagaki

Portrayed by: Tomomi Maruyama

New CEO of ZAIA Enterprise Japan

A ZAIA Enterprise representative sent to replace Gai Amatsu. He is also behind’s Jin’s re-construction and the one that gave him his new driver.

Corrupt Corporate Executive: Subverted. Unlike Gai, Williamson is a very reasonable individual to begin with and is willing to play dirty for the sake of the greater good.
Honest Corporate Executive: He’s a great deal more open than Gai, and while aloof at times is still looking out for the greater good.
Jerk with a Heart of Gold: While he is a callous and somewhat arrogant figure not unlike Gai before his redemption, Williamson is ultimately looking out for the needs of the people, even if it’s through radical means. He is also far more responsible and reactive than Gai when he was CEO, immediately calling upon Jin when the threat of Horobi becoming another Ark is highly likely. Williamson is also more than willing to entrust Jin’s earpiece to Gai who then gives it to Yua in rebuild Jin after seeing Yua’s remarkable show of empathy when up against a hostile Humagear.
Meet the New Boss: He takes over ZAIA Enterprise Japan and demotes Gai to the Thouser Department.
Multi-Ethnic Name: He has an English given name and a Japanese surname.
Mysterious Backer: He is the one who resurrected Jin and gave him the ZAIA Slashriser to act his mole in MetsubouJinrai.net
Pet the Dog: Although he is willing to destroy protesting Humagears, he was genuinely happy that Yua was able to dissolve the situation without violence, which causes him to entrust Jin’s earpiece to Gai, who gives it to Yua and Isamu to resurrect Jin in order to stop Horobi without needless bloodshed.
Pragmatic Hero: Williamson’s character arc acts to deconstruct this trope. He wants to do the right thing that ensures the safety of the people, and as such he takes the pragmatic approach of using A.I.M.S., Gai, and Jin to shut down the situation as quickly and efficiently as possible. When the opponent is someone trying to stir up a Cycle of Revenge, though, Williamson’s tactics only play into As’s hands, as any violence no matter how well-intentioned only further elevates the racial tensions between humans and HumaGears. It takes Yua going up against a bunch of rioting HumaGears with nothing but her empathy and leadership skills for Williamson to see the error of his ways.
Put on a Bus: He is put on “bonus leave” by Lyon Arkland in Zero-One Others: Kamen Rider Metsuboujinrai, allowing Lyon to be in control of ZAIA Enterprise Japan for the duration of the film.
Reasonable Authority Figure: Unlike Gai, Williamson never does anything particularly villainous and works together with the heroes to contain the threat of the Ark. His main flaw is that he is overzealous about using violence to squash problems, but he listens to Yua when she demonstrates the superiority of calming down the rioters through empathy instead of force.
When All You Have Is a Hammer: Despite generally being reasonable, Williamson attempts to solve most problems through violence, either by ordering Jin to assassinate key targets or by ordering A.I.M.S. forces to suppress the rioting HumaGears by force. While well-intentioned, these tactics ultimately do nothing to address the root of the problem, and in fact push humanity to the brink of war.

A ZAIA Enterprise representative sent to replace Gai Amatsu. He is also behind’s Jin’s re-construction and the one that gave him his new driver.

Products

Giger

Animal Motif: Like its Hiden Intelligence counterpart, it is modeled after a woolly mammoth.
Cyber Cyclops: It sports a cycloptic eye on its face.
Evil Knockoff: It has essentially the same body structure, weapons, and animal motif as Breaking Mammoth, but since Breaking Mammoth was developed first, the Giger is this to it. Where Breaking Mammoth was developed for disaster relief and is human-piloted, the Giger is designed for large-scale military pacification and is controlled by an AI.
The Evils of Free Will: It’s implied in Project Thouser that while they were designed to prevent another Humagear outbreak, they were also intended to supress regular Humagears, rendering them no more than slaves to humanity. Upon learning this, Naki decides to betray Gai by revealing their existence to Horobi.
Giant Mook: Once MetsubouJinrai.net hacks them, they act like larger, much more powerful Magia.
Mini-Mecha: Gigers were originally intended to be used as building-sized mecha suits for combat.
Sinister Scythe: The Giger’s tusks can be detached for use as twin handheld scythes.
Villain Override: The Gigers are nothing more than massive combat HumaGears, so it takes little effort for MetsubouJinrai.net to hack them as their combatant.

A giant robot developed from the data of the Mammoth Zetsumerise Key, the Giger was designed for use as a heavy weapons platform and emergency weapon against a mass HumaGear outbreak by counter-hacking them all at once. What Could Possibly Go Wrong? At least three Gigers were under construction for A.I.M.S., but the design proved just as vulnerable to a Zetsume Riser as any regular HumaGear. This result didn’t deter ZAIA from building even more Gigers, which continued to be hacked just as easily as the first.

ZAIASPEC

ZAIA’s latest product. A wearable glasses device that gives the user learning and processing speeds that exceed HumaGears.

Expy: A wearable headpiece in the same vein of products such as Google’s GLASS.
Neural Implanting: Despite being an externally-worn device, it has shown a capacity to be able to directly link to its user’s mind and control them, as shown with the multiple times Naki manipulated it.
Red Eyes, Take Warning: More like “Red Screen, Take Warning,” but when someone’s been given a RaidRiser, the system lights change from blue to red, and the glasses now posses a red tint.
- Also happens
  when the user gets hacked through it.

Raiders

Other Employees/Associates