Yua Yaiba

Yua Yaiba (刃 唯阿) is an employee of Zaia Enterprise who reports directly to its CEO Gai Amatsu as A.I.M.S.' technical advisor. Because of Gai's plans, Yua has orders to infiltrate Hiden Intelligence and act as Kamen Rider Valkyrie (仮面ライダーバルキリー) in order to gain Aruto and Isamu's trust while secretly benefiting Gai's plans.

History
She is the technical advisor for A.I.M.S and was heavily involved in the development of the A.I.M.S. Shot Riser that both she and Isamu Fuwa use to transform. She also provides technical guidance and maintenance for A.I.M.S.

When Berotha Magia is wreaking havoc with corrupted HumaGears, A.I.M.S. personnels are deployed to battle, among them Yua and the squad leader, Fuwa. In the midst of the battle, an impatient Fuwa breaks out the still in development ShotRiser from a case, without her permission, to destroy a Magia.

The next day, she and Fuwa are arriving in Hiden Intelligence HQ to interrogate the newly appointed CEO, Aruto Hiden about the HumaGear incident at the amusement park. The CEO with his secretary HumaGear easily deflects all accusation however, and their chat is interrupted by an intruder within the company building. Yua and Fuwa fight the attacking Kuehne Magia when Fuwa asked her to authorize his Shooting Wolf Progrise Key to transform, but she refuses to. Later, when Yua and A.I.M.S. personnels battles Kuehne Magia again, Fuwa arrives and forcibly transforms into Kamen Rider Vulcan. Yua then records his debut fight. The next day, she and Fuwa attend Hiden's press conference where Aruto reveals the existence of Metsuboujinrai.NET.

Yua goes to Magokoro Sushi right as Aruto Hiden was attempting to firm a contract for a new Sushi-Chef-Type HumaGear. Surprised of how little Aruto actually knows about HumaGear functions, she shows them how to interact with them by using a RisePhone, ordering a sushi form the chef. Despites her liking of the abilities of the new HumaGear model the owner, Norio Uozumi, does not believe it is not fit for the role, whoever, before they can dive deeper into the topic, Yua receives a call about a rampaging HumaGear.

As A.I.M.S was unable to destroy the Neohi Magia, Yua sets to find him but her delay in doing so angered Fuwa, much to her displeasure of his lack of knowledge on how tools work. Not long after she managed to find the rogue Magia and several Trilobite Magias, which were chasing Aruto Hiden, Izu and Norio Uozumi. She arrives to stop the Magia, including the now hacked Sushi-Chef-Type HumaGear. Aruto was opposed to destroying it to which Yua pointed out they can always just be restored later as they are merely tools.

Transforming into Kamen Rider Valkyrie, Yua fights the horde of Trilobite Magia without much issue and when Kamen Rider Vulcan joins the fight she swiftly dispatches them without his help, telling him that is how the ShotRiser system was supposed to be used. After the fight she reports to Gai Amatsu that she installed a spy program on Nigiro and from it discovered that Hiden still has the Progrise Key data that was thought to be lost during Daybreak Town Accident.

When a school field-trip to the outskirts of DayBreak Town is interrupted by Burs's attack, Yua, alongside Fuwa, transform to fight it but are unable to destroy it before it flees the scene. Later when Fuwa tries to venture to Daybreak Town alongside Go Sakurai to learn the truth about the incident, Yua stops them, remarking Fuwa is not authorized to enter there. Seeing Fuwa's determination to go on she grants him the Punching Kong Progrise Key and allows him to continue.

Yua later arrives with the developed Attache Shotgun when the famous mangaka,Choichiro Ishizumi, has his assistant HumaGear hacked into the Vicarya Magia, having Fuwa test the weapon, noting its power but difficulty to handle. She later sees Vulcan use the Punching Kong Progrise Key to boost his strenght and be able to handle the Attache Shotgun's recoil.

As MetsubouJinrai.net's activities continue to escalate, Yua is tasked by Gai Amatsu into taking them, being granted the Lightning Hornet Progrise Key to do so. She then first uses the key when a hacked a voice actress-type HumaGear, Seine Kanasawa, is hacked and transforms into the Gaeru Magia. Yua quickly overwhelms and destroys the Magia with her new form, proceeding to confront Jin, now doning a Kamen Rider form. They briefly crash before Vulcan arrives and joins her, however they are both unable to defeat Jin who manages to dodge their attacks and fly away.

When MetsubouJinrai.net brings forth a new enemy, the assassin-type HumaGear, Little Assassin, Yua intercepts him and Jin as they march to their objective. She fights Jin as the assassin observes and she takes the chance to avoid Jin during the fight and disable Little Assassin using the Freezing Bear Progrise Key. She continues on fighting Jin almost evenly, holding him back long enough for her helpers to abduct the assassin without him noticing and manages to escape as Zero-One and Vulcan join the fight.

Yua manages to undo the hacking of Little Assassin, leaving no apparent trait commonly found on hacked units, however, she keeps his orders to attack humans and sets him free near a school alongside the Dodo ZetsumeRise Key and records as he attacks the students. As the Dodo Magia rampages she transforms and joins Vulcan and Zero-One against him and the new Mammoth Magia, giving Zero-One the Freezing Bear Progrise Key to destroy the Mammoth Magia and helping Vulcan destroy the Dodo Magia. After the Magias are destroyed she secretly recovers the Mammoth ZetsumeRise Key.

After handing the Mammoth ZetsumeRise Key to Gai Amatsu Yua checks on the production of the Giger units at the A.I.M.S. Special Technology Laboratory by Zaia Enterprise when the place is attacked by Jin, Little Assassin and Horobi himself. Unknown to her the actions she previously took led to Horobi changing Little Assassin's prime target to herself. She transforms and fights the restored Dodo Magia and Kamen Rider Jin as Horobi infiltrates the facility.

Despites putting up a fight the combined strength of the improved Dodo Magia and Jin prove to be a match for Lightning Hornet and she is driven down. Horobi leaves the laboratory with a stolen Attache Shotgun and Attache Arrow as she was still fighting, leading her to ask why they are exploiting HumaGears and attacking humans, to which they confirm it is the will of the Ark before using the Attache Arrow to defeat her, knocking her out of her transformation in one blow. Despites being injured she manages to get back inside the laboratory, worried that the Giger units had been hacked, but no clear signals were present.

Yua goes to the HumaGear hospital in order to be treated and return to work as quickly as possible, having her arm immobilized due to he attack. There however, she notices alongside Aruto and Fuwa that the Nurse-Type HumaGear, Mashirochan showed signs of self-awareness and accompanies them back to Hiden Intelligence, where she enters their secret laboratory without permission as they are running testes on the HumaGear.

Yua notes that if a HumaGear awakens to Singularity and develops self-awareness it would leave A.I.M.S. no choice but to act upon it, leading Fuwa to want it destroyed right there to prevent any further damage but he is stopped by Yua right as they are warned that the Gigers were indeed hacked and went berserk, attacking the hospital.

Yua, Fuwa and Aruto arrive to stop MetsubouJinrai.net and the Giger and learn that Horobi and Jin are actually rogue HumaGears themselves. The trio transforms and fights the horde of Trilobite Magia, Jin and the Dodo Magia and Yua fights Jin despites her wounded arm, leading to her almost being killed until Vulcan saved her at the last second and they both join forces to fight him, however, Horobi arrives at the scene and transforms into his Kamen Rider form, engaging Vulcan and quickly overpowering him. Yua tried to help Vulcan but Jin continued to fight her himself until the fight was cut short by Horobi landing a deadly blow on Vulcan, knocking him out of his transformation in critical condition.

After the defeat to Horobi, Yua rushes with Fuwa to the hospital where the Doctor-Type HumaGear, Dr. Omigoto, confirms he needs urgent surgery and starts to prepare him. Yua stays during the procedure until Hiden shuts down all of the HumaGear staff at the hospital, preventing Fuwa's operation from being started. She rushes to Hiden Intelligence's headquarters to demanding them to be reset, pointing that despites the risk of being hacked, the medical HumaGears were still saving lives and their shutdown would ultimately cost more lives. She confesses that the Giger used by MetsubouJinrai.net was actually a weapon developed by A.I.M.S and that they are also responsible for the events happening, requesting once again the HumaGears to be reset and taking responsibility upon the risk.

MetsubouJinrai.net attacks the hospital with the hacked Giger and knowing they couldn't win as they are, Yua hands over the Mammoth Zetsumerise Key to Izu, prompting her to recognize the Giger System as similar to one developed by Hiden. Yua was slightly shocked to learn that Hiden was also researching giant weapons, but was quickly corrected by Izu that it was designed to be a rescue unit to be used on disaster zones. Before departing, she asks Izu if she thinks HumaGears will be well intentioned towards humanity when they reach Singularity, but gets no reply.

Rushing back to the hospital, Yua waits until Fuwa is out of surgery, confirming he is now out of risk and telling him it was all thanks to a HumaGear doctor. She later returns to Hiden to tell Izu about her conclusion but is confronted about having leaked footage of the de-hacked Little Assassin still attacking humans despites having no signs of being hacked. She denies the fact and leaves.

Reporting back to Zaia, Gai Amatsu shown surprise at Yua handing over the Mammoth ZetsumeRise Key to Hiden Intelligence, to which she apologizes and is then tasked with obtaining a new ZetsumeRise Key.

Yua, Fuwa and the A.I.M.S.'s soldiers take part in guarding Hiden Intelligence's movie production featuring the actor Shinya Owada and the new Actor-Type HumaGear, Enji Matsuda. The set is quickly attacked by Jin and the yet again restored Little Assassin, Yua joins Vulcan in fighting Jin and they both managed to push him enough but he ultimately flees from the fight.

After the attack Yua and Fuwa discuss MetsubouJinrai.net targeting the film set and shutting down the production, but Yua affirms that A.I.M.S. is capable of protecting them. Fuwa however, changes the subject as she was about to leave and asks why she leaked the footage of the non-hacked Little Assassin, pointing that their mission is to keep watch over the HumaGears and not take down Hiden, to which she replies the latter is her true mission.

When filming restarted Yua was present when Little Assassin attacked Enji Matsuda over his failure on acting alongside Shinya Owada and attacks him, transforming once again into the Dodo Magia. Jin intervenes, saying that he shouldn't attack HumaGears they are attempting to hack before transforming into his Kamen Rider Form and both engaged Valkyrie. She was quickly overpowered by the duo until Zero-One arrived and fought Jin, leaving her to fight the Dodo Magia, who kept improving as he fought and grew strong enough to defeat her.

Knocked out of her transformation by the Dodo Magia, Yua is saved by Fuwa who transforms into Vulcan and fight the Dodo Magia and his horde of Trilobite Magias. Seeing Vulcan outnumbered, Yua gave him the Gatling Hedgehog Progrise Key which he used to destroy the Trilobite Magias and once again, the Dodo Magia. After the fight she tells Fuwa that she may one day have to betray him and they'd need to fight each other, to which he replied he would win. Reporting back to Gai Amatsu she informs that Hiden's filming is facing issues, to which he replies everything is going according to plan.

Yua continued to keep guard at the filming set when Horobi infiltrated it and hacked the Actor-Type HumaGear to create the Arsino Magia. She transformed to fight the new Magia and managed to quickly destroy it, recovering the Arsino ZetsumeRise Key after the fight. She takes the key back to Gai Amatsu and a afterwards she is tasked to bring Aruto Hiden over to ZAIA to meet her boss.

With Little Assassin having attempted to kill Shinya Owada the police, Yua, Fuwa and A.I.M.S were forced to take action and conduct a full investigation into Hiden's building, however they were unable to find any evidence of Little Assassin being one of their creations. In their meeting Yua reveals to the police that Hiden has an undisclosed laboratory and sets them on to it.

Thanks to her actions Zero-One became a fugitive from A.I.M.S and the police, running away until she managed to intercept him atop a building. Yua however, let her guard down when asked by Zero-One if that is how ZAIA dealt with things, allowing him just enough time to make his way through her and away so she couldn't pursue him any further. .

Amidst the Dodo Magia Custom II's rampage, Horobi and Jin appeared before Zero-One and Vulcan, suggesting a truce until the Magia was dealt with. As Fuwa was about to reject, Valkyrie appeared as joined him in shooting at Horobi, saying that it was their answer.

The trio managed to deduce where the Dodo Magia would appear and moved in there to fight him one last time. Transforming together for the first time, Zero-One, Vulcan and Valkyrie join forces but are still unable to match the Dodo Magia's continued growth and horde of Dodo Magia Chicks until Zero-One used the Shinning Hopper Progrise Key to finally put an end to Little Assassin as Valkyrie and Vulcan destroyed the Dodo Magia Chicks.

With the fight finally over they recover the Dodo ZetsumeRise Key, but are soon attacked by Kamen Rider Horobi who steals back the key and swiftly defeats Valkyrie and Vulcan.

After the final destruction of the Dodo Magia, Yua gives a presentation to the A.I.M.S personel about MetsubouJinrai.net's activities and confirmed leaders, Jin and Horobi. Fuwa notices the pattern in MetsubouJinrai.net's naming convention and theorized that there would be two more generals, one for each kanji left but Yua was unable to confirm their existence at the moment but suggests that it is likely that the group has a spy working inside Hiden Intelligence.

Aftewards Yua and Fuwa investigate the Hiden Space Development Center, looking for the HumaGears responsible for maintenance on Zea, the Space Brothers Raiden and Subaru. Raiden's aggressive remark makes Fuwa become suspicious of him being linked to MetsubouJinrai.net, however, Jin arrives and transforms to fight before they could investigate any further, prompting Yua to transform and engage Jin alongside Zero-One and Vulcan, successfully pushing him back.

When Fuwa's behavior starts to spiral out of control Yua meets with Gai Amatsu and questions him about leaving her partner continue doing as he pleases, showing clear concern towards Fuwa's life being endangered by his own actions. Her concerns are however shrugged aside by Gai who says all they can do is watch as the Ark was about to awaken and with it bring a new mythology, that of the Kamen Riders.

Kamen Rider: Reiwa The First Generation
Due to the timeline changes caused by Time Jacker Finis, Yaiba is seen fighting alongside the resistance fighters against the HumaGears under the command of Will.

Super Hero Time
In the closing of Super Hero Time, Kamen Rider Valkyrie is seen posing alongside Vulcan, Zero-One and the.

Kamen Rider Battle: Ganbarizing
Kamen Rider Valkyrie, alongside Vulcan ,Zero-One,Horobi,Jin and other riders will be playable characters in Kamen Rider Battle Ganbarizing.

Kamen Rider City Wars
Kamen Rider Valkyrie is a playable character alongside the other Kamen Riders. Notably, she is the first female character to be appear in this mobile game.

Kamen Rider Buttobasoul
Kamen Rider Valkyrie is a playable character with Vulcan, Zero-One and other Riders in Kamen Rider Buttobasoul.

Personality
Yua is a professional and by-the-book agent, remaining levelheaded even in dangerous situations. She displays a great degree of cunning in her interactions with both Aruto and Isamu, manipulating both of them to suit her own ends. Yua shows signs of a cold nature, but otherwise shows a great deal of restraint. Unlike Isamu, Yua harbors no hatred for HumaGears, but she sees them as nothing more than mere tools that could simply have their data backed up if corrupted, with no inherent value beyond their use as labor.

However, this doesn't mean that she won't use the HumaGears for her own goal, as she nonchalantly hacked a HumaGear sent by MetsubouJinrai.net to resume its quest to attempt to kill Aruto and record its performance for data collecting purposes. She is also quick-witted enough to steal the Mammoth ZetsumeRise Key without Jin knowing before it's too late.

Despite this, Yua does have a sympathetic heart underneath her cold and stoic demeanor, as when Isamu got poisoned by Horobi, she cried and was worried about him, despite the two not always getting along. After Jun Fukuoze callously shut down the HumaGear in hospitals to protect Hiden's stock price and PR image, Yua broke her calm facade and pleaded to Aruto to reverse the order and put the androids back online as it would condemn hundreds of people to die without medical aid due to the short-staffing of human doctors. When Yua's secret on observing Little Assassin was busted, Yua sadly warned Isamu that she might betray him one day as Isamu knew that Yua had a strong relationship with ZAIA's CEO.

Yua's favorite sushi is Maguro (tuna) nigiri with soy sauce.

Powers and Abilities

 * Genius-Level Intellect: As the technical advisor for A.I.M.S, Yua has a great deal of intellect as she developed several of A.I.M.S.'s weaponry on her own.

Forms
Standard =

Devices

 * A.I.M.S. ShotRiser - Transformation device and main weapon
 * Progrise Keys - Transformation trinkets

Weapons

 * Attache Shotgun

Suit-equipped weapons:
 * Hex Vespa: Hornet-like missiles located in the upper body.

Allies:

 * Izu: TBD
 * Aruto Hiden/Kamen Rider Zero-One: At first glance it seemed that Yua understood Aruto about the value of the HumaGears, but then it was learned that she only sees them as replaceable tools, something that Aruto doesn't believe in, she is also the first to discover his identity as Zero-One. She laments Aruto's actions as both the CEO of Hiden Intelligence and Zero-One, exclaiming that if he didn't bother to protect the Humagears, there would never be any casualties.
 * Isamu Fuwa/Kamen Rider Vulcan: Isamu and Yua were assigned to the same team to exterminate Magias. Isamu and Yua are shown to argue often, with the two rarely coming to an agreement. Yua also refuses to give authorization Isamu's Shooting Wolf Progrise Key due to his reckless nature, calling him a loose cannon. However, when the situation calls for it, the two are capable of cooperation. Yua also monitors Fuwa by recording his performance as Vulcan for reasons unknown. Over time, Yua worries Fuwa as he continuously put himself in dangerous, life-threatening situations just for fulfilling his revenge towards MetsuboJinrai.Net.
 * Gai Amatsu: He is the benefactor and the superior of Yua, to whom he gives information. Yua initially agrees to do whatever Gai orders, but after he clearly shows no concern for people's safety, she starts to doubt his benefactor visions. Nevertheless, Yua remains powerless to even object Gai decision.

Enemies:

 * Horobi: TBD
 * Jin: TBD

Hiden Intelligence:

 * Jun Fukuzoe: TBD

Portrayal
Yua Yaiba is portrayed by Hiroe Igeta (井桁弘恵). Her suit actor is Satoshi Fujita (藤田 慧 Fujita Satoshi).

Etymology

 * Kamen Rider Valkyrie's name comes from the .224 Valkyrie, a type of ammunition used in assault rifles. Valkyrie is also the name of female warriors in Norse Mythology who fought alongside Odin.