Yua Yaiba

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 is an engineer of A.I.M.S. who transforms into . She temporarily was the before her defection.
==History==
===Background===
Yua Yaiba was born on April 18, 1995. At age 21, she became employed at ZAIA Enterprise Japan under Gai Amatsu's tenure. Yaiba placed as the technical advisor for A.I.M.S., putting her in charge of major A.I.M.S. weaponry developed by ZAIA Japan. She was assigned to observe Isamu Fuwa to prepare him to become A.I.M.S.' latest Kamen Rider. At some point, she unknowingly received an A.I. chip implanted into her brain in order to properly use the Shotriser.
===The MetsubouJinrai Mystery===
Yua Yaiba was deployed with Isamu Fuwa and his A.I.M.S. squad to subdue the rampaging Trilobite Magia at a local amusement park. As more began to overwhelm the soldiers, Fuwa entered the van to use the A.I.M.S. Shotriser without Yaiba's authorization. After containing the threat, Fuwa and Yaiba visited Hiden Intelligence to meet with the new president, Aruto Hiden to discuss the rampage. Upon recording data of Isamu Fuwa's transformation into 'Vulcan', Yaiba is given the permission to use the A.I.M.S. Shotriser and Rushing Cheetah Progrisekey to transform into 'Valkyrie' to subdue any Humagear who violates the A.I. code.
Through Gai Amatsu's advising, Yaiba would continue to provide Aruto and Fuwa additional Progrisekeys in their battles against MetsubouJinrai.net, all while collecting and recording data from them. As MetsubouJinrai.net's activities continue to escalate, Yaiba was tasked to reprogramming the Dodo Magia, but allow it to attack humans. She oversees the progress of the Gigers until MetsubouJinrai intercepts A.I.M.S.' laboratory to take the Gigers and Attache Weapons. During a battle with Horobi, Fuwa is placed in critical condition and Yaiba has no option except work with Hiden Intelligence to help Zero-One access the Breaking Mammoth state.
After Is caught Yaiba at the scene of the Dodo Magia, Fuwa begins to suspect foul play recalling her connections with ZAIA Enterprise. While she denies any wrongdoing but suggests they would be enemies one day, Fuwa promises to defeat Yaiba when the time comes. The pair continued working together to subdue the Dodo Magia. Once A.I.M.S. uncovered a traitor within Hiden Intelligence, which was later revealed to be astronaut Humagear Uchuyaro Raiden, under his true codename 'Ikazuchi'. Taking concern of Fuwa's behavior, Yaiba questions about letting her partner do what he pleases despite endangering by himself.
Yaiba participated in a raid with A.I.M.S. to take down MetsubouJinrai. She declared the terrorists were in violation in A.I. code and fought MetsubouJinrai as Valkyrie. With only Jin remaining and him launching an attack to the city, Yaiba later witnesses Aruto as Zero-One Shining Assault Hopper defeating Jin. With MetsubouJinrai dismantled, Yaiba left A.I.M.S. and transferred back to ZAIA Enterprise Japan, saying her goodbyes to Fuwa. Meeting at Gai's office, she learned of Gai Amatsu's role in Ark's rouge programming, all to tarnish Hiden Intelligence and the Humagears by manipulating MetsubouJinrai.net. Gai reassured Yaiba that the real battle was about to begin and that she would become his right-hand woman from this point on.
===The Workplace Competition===
Following Gai Amatsu's announcement to buy out Hiden Intelligence, Hiden and ZAIA engaged in a five-part Workplace Competition to pit the Humagears and ZAIA Specs to challenge their worth and functionality to the public. Yaiba was assigned to assist Gai, much to Aruto's surprise that she suddenly left A.I.M.S. Following the emergence of the Raiders, Yaiba is suspicious after knowing ZAIA Japan's Progrisekeys had been stolen. Yaiba finally comes into conflict with Isamu Fuwa having caught wind of Gai and ZAIA Japan's role in the Raiders.
Gai Amatsu had taken the opportunity to become Kamen Rider Thouser and uses every underhanded method to downplay the Humagears, even intentionally provoking them to incite malice, all while she was forced to stand silent from Gai's foul play. Under Gai's orders, Yaiba created the MetalCluster Hopper Key using Ark. Despite its intentions to lock Zero-One's authorization system, it inadvertently allowed Aruto to access Zero-One MetalCluster Hopper and corrupted the system to the Ark instead. While Yaiba remarked Zero-One had evolved, Fuwa denies believing that was even Zero-One at all. Eventually, the creation of the Progrise Hopper Blade would restore Zero-One's connection back to Zea.
While still forced under Gai's orders, even forced to hack a Humagear, Yaiba is later given a Raidriser and the Fighting Jackal Progrisekey. Despite ZAIA Japan's victories from the start of the competition, Hiden Intelligence prevailed in the latter half. This leads to the tiebreaker final round involving a referendum campaign to determine if Humagears should be welcomed to society. However, due to the fallout of rapper Humagear MC Che.ck-It-Out going berserk on live television, Yaiba is forced to dispose him by displaying her transformation into the Fighting Jackal Raider to the public.
Yaiba later reveals to Fuwa they both have A.I. chips embedded in their brains. However, it turns out that Gai uploaded the data of Naki, one of MetsubouJinrai's executives, onto his chip and had them distribute Raidrisers the entire time. When Fuwa questions why Yaiba is still working for Gai, she avoids responding. With the populace losing faith on Hiden Intelligence and the Humagears, ZAIA Enterprise Japan enacts its takeover bid on the company. Gai orders Yaiba to eradicate the Humagears starting with Izu, but Fuwa stopped her and found the resolve to become RampageVulcan, who declares to fight her until he understands Yaiba's true dreams. Nevertheless, Hiden Intelligence was acquired as a subsidiary of ZAIA Japan and Yaiba still continues to work under Gai's command.
===Finding True Purpose===
Several days after Gai Amatsu's tenure as Hiden Intelligence CEO, Yua Yaiba became the squad captain of A.I.M.S. following Isamu Fuwa's resignation. She is tasked to eliminate the Humagear that are recalled by Hiden Intelligence and leads the Battle Raiders. While Fuwa expresses he no longer has hatred against the Humagears, he assures he'll pursue fighting A.I.M.S. and will fight Yaiba unless she finally stands up to herself.
Aruto Hiden manages to retain the patents of the Humagear and Zero-One technology in order to open his new business, HIDEN Manufacturing. While she does keep an eye out on the Humagears, Yaiba led a raid on the company building in an attempt to eliminate the restored Humagears and reactivate Naki from Fuwa's chip by force transforming him into Vulcan Assault Wolf. Through a series of events, Naki managed to free themselves from Gai Amatsu's control, working together with Fuwa to fight against Thouser. Learning this made Yaiba began to question if she still had any free will left to fight against Gai.
However, Yaiba would reach her breaking point after discovering Fuwa's childhood memories during the Daybreak Town Accident were fabricated by Gai to make him more hostile towards Humagears. Yua was forced to execute Fuwa despite her hesitation, but only face her defeat again. It was then she was attacked by Gai's subordinates, losing her Raidriser and Fighting Jackal Progrise Key in process. Gai nevertheless revealed the truth to Fuwa, much to his despair. This was the last straw for Yaiba to rebel against Gai, having seen enough on how far he went to fulfill his ambitions. Having assumed the form of Kamen Rider Valkyrie once more, she fights together with Vulcan to defeat Thouser together and punches him to declare her resignation from ZAIA Enterprise. In a sign of good gesture, Yaiba collaborated with Jin to separate Fuwa and Naki.
===The Ark Uprising===
MetsubouJinrai would accomplish their goal in completely reviving the Ark, having evolved into Kamen Rider Ark-Zero. Yaiba as Kamen Rider Valkyrie arrived in Daybreak Town by Jin's request to assist in combatting Ark but ends up in critical condition due to Ark-Zero becoming unlike any enemy they've face. After her recovery in the hospital, Yaiba and Fuwa would reassociate themselves with A.I.M.S. as the threat of the Ark is reaching beyond comprehension. Following Gai Amatsu's change of heart, Yaiba vocally refused to accept his apologies, but Fuwa requested him to let A.I.M.S. operate independently from ZAIA.
Through the innovation of Kamen Rider Zero-Two, the Ark was finally subdued and completely shut down by the efforts of Aruto Hiden and Horobi. Unfortunately, Horobi announced his intention to destroy humanity and began raising an army of Humagears. While Valkyrie and Vulcan engaged Horobi, the latter would destroy Izu and brough Aruto Hiden's advent into becoming Kamen Rider Ark-One. Believing Aruto has been possessed by the Ark, she went to confront him with Fuwa and Gai. However, Ark-One defeats the three Kamen Riders with ease and disables Valkyrie and Vulcan's A.I chips, blocking them from transforming again. She realized that Aruto isn't controlled by the Ark, but choosing to act under his own volition.
With tensions between humans and Humagears were being raised due to Aruto's actions as Ark-One, Yaiba attempted to convince A.I.M.S. to not harm the protesting Humagears and vice-versa. Despite Williamson Yotagaki's orders, Yaiba revealed that A.I.M.S. is no longer a subsidiary of ZAIA Japan, thanks to Gai Amatsu's efforts, and has assumed command of A.I.M.S. as the current squad commander.
During the final battle between Aruto Hiden and Horobi, Yaiba watched the televised battle in the Thouser Department office while trying to reactivate Jin's A.I. With Fuwa and Gai, she would watch Ark-One fighting Horobi that led to Aruto letting go of his feelings of revenge. As Zero-One defeats Horobi, he spares the Humagear out of mercy. Following this final victory, Yaiba meets with the A.I.M.S. cadets and would introduce Naki as their new technical advisor, with a mission to protect A.I. for the betterment of humanity and Humagear alike.
===Kamen Rider Zero-One: REAL×TIME===
Three months after the threat of the Ark had subsided, Yaiba regains her ability to become Kamen Rider Valkyrie after Gai Amatsu restored her A.I. chip. However, a new incarnation of the Ark arises with the presence of Rihito Isshiki (S), who embarks to destroy the world and replace it with a virtual paradise. Yaiba engages the Abaddon Riders as Valkyrie engages the Abaddon Riders with the A.I.M.S. soldiers, even engaging some while riding a bike. She also gathered up information regarding the identities of the Abaddons with Naki, Shesta, and Gai. Valkyrie joins with Thouser, Horobi, Vulcan, and Jin for the final showdown against the Thinknet forces.
===Zero-One Others===
Sometime after the Thinknet crisis, Yaiba permitted Naki to help MetsubouJinrai.net in a situation. After the quartet allegedly attacked ZAIA Japan HQ, Yaiba conducted a press conference and hounded by the reporters regarding the situation. Suddenly, ZAIA Enterprise CEO Lyon Arkland arrived to accuse MetsubouJinrai.net of being a threat much to Yaiba's disagreement but couldn't respond any further as MetsubouJinrai.net hacked the live feed to declare war on ZAIA. After Kamen Rider MetsubouJinrai murdered Lyon Arkland and destroyed ZAIA Japan HQ, Yaiba was given orders by Secretary of National Defense, Shigeru Daimonji, to eliminate the runaway Rider.
Yaiba pursued Kamen Rider MetsubouJinrai as it sets sights on her. While Valkyrie and Vulcan engage the runaway Rider, MetsubouJinrai was able to overwhelm them, and the pair are forced to evacuate. After learning about the events that unfolded during the ZAIA HQ destruction, Yaiba found herself aided by Sold20 who warns them about the Solds are launching a war against A.I.M.S., loyal to MetsubouJinrai. Upon arriving at A.I.M.S. HQ, Yaiba confronts MetsubouJinrai but is protected by Sold20. She was given the Serval Tiger Zetsumerisekey before Sold20's systems shut down, allowing her to assume Kamen Rider Valkyrie Justice Serval. However, MetsubouJinrai was far too powerful, and Valkyrie was only able to briefly damage the MetsubouJinrai Driver's power system. MetsubouJinrai would later repair the damage done to the power system, leaving Yaiba having not accomplished anything. Yaiba was later brought to the hospital, which motivated Fuwa to fight MetsubouJinrai himself. Although Vulcan Lone Wolf managed to vanquish MetsubouJinrai, Yaiba arrived to see him in critical condition. Yaiba stayed behind Fuwa's side during what appeared to be his final moments.
Sometime afterwards, Yaiba had recruited Sold9 and Sold20 to A.I.M.S. and they arrive at Shigeru Daimonji's press conference during his announcement to abolish humanoid artificial intelligence. Yaiba refutes that no matter what, the will of MetsubouJinrai has moved onto the next generation of Humagear as she vows to protect them.
==Other Events==
===Kamen Rider: Reiwa The First Generation===
Due to the timeline changes caused by Time Jacker Finis, Yaiba is seen fighting alongside the Human Resistance fighters against the Humagears under the command of Will.
In the mid-credit scene, Fuwa tells Yaiba about a dream where he was turned into a Humagear. He asks Yaiba to destroy him in the event that happens. Yaiba asks him about his actions if she is turned into one, Fuwa ensures her that he will crush her.
===Kamen Rider: Beyond Generations===
===Girls Remix===
Kamen Rider Valkyrie appeared to assist Rinko Daimon and the police when they engaged a mysterious humanoid. She, however, was overpowered and the being was able to escape.
==Video Games Appearances==
==Personality==
Yaiba is an extremely professional and by-the-book agent, remaining levelheaded even in the most dangerous situations. She is also extremely cunning and quick witted, able to manipulate both Aruto and Isamu to suit her own ends. Due to her long-term working relationship with Gai Amatsu, it has corrupted her perspective of Humgears to the point where she sees them as nothing but tools that could simply have their data backed up if corrupted, with no inherent value beyond their use as labor. 
However, despite this cold and often stoic demeanor, Yaiba does possess humanity and sympathy for others as she was worried and cried for Isamu after he was put comatose by Horobi, despite the two not always getting along. She broke her calm façade and pleaded to reverse Hiden Intelligence's order of disabling the Humagears, as it would condemn hundreds of human lives to death. Showing contrast to Gai, her superior, she continued to show a great care for Isamu's well-being even after returning to ZAIA Enterprise, as well as displaying signs rebellion against Gai. However she is fearful of betraying him due to his leverage over her with the A.I. chips inside both her and Isamu, lacking the willpower to defy him. 
However by Episode 33, she snaps after she personally witnesses Gai selfishly cross a line. Although she has since defected from ZAIA Japan, she continues to wallow in guilt over being partially responsible for the Ark's revival. Thanks to Isamu's previous attempts to make her find her own self purpose, she opened her heart to him, and subsequently to others as well. Since the end of the Ark's reign, she has begun to accept Humagears and, like Aruto, recognize that they have a heart as well, eventually taking one in to work for her. When the dark era of Kamen Rider MetsubouJinrai and ZAIA's destruction reigned, Yaiba upheld her pride and never faltered in her beliefs for the group when helping Sold9 and Sold20. 
Prior to entering a battle, Yaiba would say 
==Abilities==
*Skilled Combatant: To be added
*Engineer: As the technical advisor for A.I.M.S, Yaiba has a great deal of intellect as she developed several of A.I.M.S.'s weaponry on her own.
*Bilingualism: Yaiba was able to interpret the English spoken by Kamen Rider MetsubouJinrai back to Japanese. 
===Former Weaknesses===
*A.I. Chip: Like Isamu, Yaiba also has a computer chip implanted in her brain, allowing her to safely use the A.I.M.S. Shotriser. Unlike Isamu, she knew about the chip the entire time and is forced to follow Gai's every order, who uses the chip as a bargaining tool to control both her and Isamu. After realising the truth behind Isamu's past, Yaiba would eventually be able to show a certain level of resistance towards Gai's control. However, the Ark can still hack into her neural implants, as shown in her first battle against Kamen Rider Ark-Zero. Yaiba would lose her transformation ability after her chip was disabled by Kamen Rider Ark-One. Gai later restored Yaiba's ability to transform.
==Forms==
==Equipment==
===Devices===
*A.I.M.S. Shotriser - Transformation device and main weapon as Kamen Rider Valkyrie
*Raidriser - Transformation device as the Fighting Jackal Raider
*Progrisekeys - Transformation trinkets
*Progrise Holder - Carrying straps for Progrisekeys
===Weapons===
*Attache Shotgun
Suit-Equipped Weapons
*Hex Vespa: Hornet-like missiles located in Lightning Hornet's upper body.
===Vehicles===
*A.I.M.S. Motorcycle - Personal motorcycle
==Relationships==
===Friends===
*Isamu Fuwa/Kamen Rider Vulcan: Despite being assigned to the same team, Isamu and Yaiba often bicker, causing her to deny him authorized usage of the Shotriser and any of his Progrisekeys. Yaiba monitored Isamu's growth as Vulcan for ZAIA Japan, ultimately contributing data to the ZAIA Thousandriver. Despite her affiliation with ZAIA Japan and returning to Gai, she has shown a great amount of personal care for Isamu's well being, as he is always putting himself in dangerous, life-threatening situations just for fulfilling his revenge towards MetsuboJinrai.net. Her personal feelings for Isamu restrict her from fully following Gai's orders to eliminate him. After hearing of Isamu's true past from Gai, she tried to protect Isamu from hearing it as she thought it would emotionally destroy him, though it was Isamu's response that ultimately encouraged Yaiba to betray Gai. After her resignation, Isamu responded with a smile. After being confined to the hospital upon being defeated by Ark-Zero, she apologized to Isamu for her past deeds, which he forgave her for. When Gai apologized to Isamu and Yaiba for using them, she stands up for Isamu's sake, saying his actions robbed him of a normal life. 
*Aruto Hiden/Kamen Rider Zero-One: At first glance, it seemed that Yaiba 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. After showing her loyalty to ZAIA Japan, she becomes colder with Aruto, although she still supports Aruto when there's moral value on his action. Thanks to Aruto kind nature towards People and Humagears alike, Yaiba starts to doubt her decision in supporting ZAIA Japan. 
*Is: At first, Izu considered her an ally, but after seeing what Yaiba does with ZAIA Japan, she begins to distrust her. As the Fighting Jackal Raider, she tried to destroy her under Gai's orders.
=== Allies ===
*(Kamen Rider) Horobi: To be added
*(Kamen Rider) Jin: Yaiba and Jin were at first enemies. Additionally, Valkyrie was the Rider who fought Jin the most before the latter's revival. After Jin revealed himself since his return, Yaiba was surprised by this. After her resignation from ZAIA Japan, Yaiba made a brief alliance with Jin to extract Naki from Isamu's A.I chip. They eventually teamed up to fight against the Ark-possessed Horobi, with Jin persuading Yaiba to fight after she was briefly consumed by the satellite's fear. Upon his second death, Yaiba retrieves his earpiece in order to rebuilt Jin.
*(Kamen Rider) Ikazuchi/Uchuyaro Raiden: To be added
*(Kamen Rider) Naki: Yaiba eventually recruits Naki into A.I.M.S. after the conclusive battle between Zero-One and Horobi.
*Gai Amatsu/Kamen Rider Thouser: He was the benefactor and the superior of Yaiba, to whom he gave information. Yaiba initially agreed to do whatever Gai orders, but after he clearly shows no concern for people's safety, she starts to doubt her benefactor's vision for the future and his motives. Nevertheless, Yaiba remained powerless to even object Gai's decisions. It was later revealed that Yaiba's loyalty towards Gai was caused by an A.I Chip implanted inside her head like with Isamu, with Gai controlling her thoughts to ensure her loyalty. After his countless defeats on the hand of all Kamen Riders (including Yaiba herself), fed up with Gai's amoral actions, behaviours, and cruel treatments towards her, Yaiba decides to quit ZAIA Japan for good by punching her former benefactor in the face. During the battle against Ark Zero, she seemingly reconciled with Gai and later teams up in the fight against Ark Zero.
*Jun Fukuzoe: To be added
*Sold20: To be added
=== Enemies ===
* Ark: To be added
* Lyon Arkland/Kamen Rider Zaia: To be added
*Kamen Rider MetsubouJinrai: To be added
==Behind the Scenes==
===Portrayal===
Yua Yaiba is portrayed by . Her suit actor as both Kamen Rider Valkyrie and the Fighting Jackal Raider is .
===Etymology===
*Kamen Rider Valkyrie's name comes from the , a type of ammunition used in assault rifles.
* is also the name of the female warriors in Norse Mythology who fought alongside Odin in absolute loyalty in him, referencing Yaiba's initial loyalty to Gai Amatsu.
===Concept Art===
Fighting Jackal Raider was designed by .
69518538_511981499372749_1535583164174744062_n.jpg|Kamen Rider Valkyrie Rushing Cheetah concept art
FB IMG 1570322174246.jpg|Kamen Rider Valkyrie Lightning Hornet concept art
Fighting Jackal Raider concept art.jpg|Fighting Jackal Raider concept art
Territory Scythe concept art.jpg|Territory Scythe concept art
==Notes==
*Yaiba spins her Progrisekey before transforming. Behind-the-scenes, this is done by attaching a fidget spinner with the key on it to actress Hiroe Igeta's finger before removing it in the next shot. Bandai Premium later released the A.I.M.S. Role-play Set, which includes a Rushing Cheetah Progrise Key with a fidget spinner attached.
*In Episode 8, Horobi was shown to have data on Yaiba.
**Yaiba's date of birth is registered as of April 18, 1995.
**Her registered height is 170 cm.
**She had been employed by A.I.M.S. for at least two years at that point in time.
**Her registration number is No. 03311.
*Yaiba's favorite sushi is tuna nigiri with soy sauce.
*According to producer Takahito Omori, Yaiba was originally planned to be the host to Ark, which was housing in her A.I. chip. This revelation would've explained her genius technical skills and fighting ability as a result of Ark's influence. However, this plotline was scrapped to cherish Yua's "charming demeanor" and her close bond with Fuwa.『フィギュア王』No.276、ワールドフォトプレス、2021年2月28日、 ISBN 978-4-8465-3239-0。
*In addition to the Raiders' usual recycled legs from Vulcan/Valkyrie, the markings on the Fighting Jackal Raider's face and the prongs on either side of its head resemble those on Valkyrie.
**Furthermore, the Fighting Jackal Progrisekey has 'Valkyrie' mentioned in its transformation phrase.
**The concept art of Fighting Jackal Raider shows that Valkyrie's face was hidden under the visor.
*According to the production staff, Valkyrie was supposed to have her Final Form in the TV show, but was cut due to the reduced number of episodes.https://pbs.twimg.com/media/E0d0dhNUcAEgnO0?format=jpg&name=360x360 Ultimately, she would achieve Valkyrie Justice Serval in Zero-One Others.
*Kamen Rider Valkyrie Justice Serval's suit is a retool of her Lightning Hornet suit, with the claws retooled from Orthros Vulcan, and a new helmet.
*Despite the similarly pronounced name in Japanese, Justice Serval is derived from the Japanese name for the rather than the serval.
==Appearances==
==References==
==Navigation==
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