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One of our objectives is to create the ultimate life form. I wonder what would happen if someone who was injected with the Smash element underwent experimentation again. I'll have to run a test.
~ Night Rogue as he injects Masahiro Nabeshima with a second dose of the Smash element.
I knew nothing...I survived by trusting only my ambitions. But alone, I was just a piece of trash that couldn't do anything. That's why I...took my great pride...took my vanity...and threw away everything to be reborn.
~ Kamen Rider Rogue describes how he became "reborn" as a Kamen Rider.

Night Rogue is the leader of the enigmatic organization Faust and one of the five main antagonists of Kamen Rider Build (alongside Blood Stalk, Yoshiko TajimiMasakuni Mido and Juzaburo Namba). His true identity is Gentoku Himuro, son of Touto Prime Minister Taizan Himuro and head of the Touto Institute of Advanced Matter Physics.

He is responsible for the experiments carried out on Sento Kiryu and Ryuga Banjou and later for abducting Ryuga's girlfriend Kasumi and turning her into a Smash. After being banished from Touto, he starts working for Namba and becomes the Kamen Rider of Seito, Kamen Rider Rogue. Eventually though, Gentoku would defect from Namba's side and join the heroes, becoming one of the main protagonists of the series.

Gentoku serves as the main antagonist of the "Birth" arc and later as a major antagonist in the "War" arc. He also appears as the protagonist of the three-part ROGUE Blu-Ray miniseries which details his origins and how he became Night Rogue.

He was portrayed by Kensei Mikami, who also played Teru Mikami in the 2016 live action Death Note film.

History

Past

From this day forth, we will be known as Faust! Those who don't know better may think our actions are acts of the devil. However even if our hands are soaked in blood, we will turn this country into what it has the potential to be!
~ Night Rogue founding Faust.

Within a decade of the raising of the Skywall, Gentoku rose to a prominent position within the Touto government, being the head of Touto Institute for Advanced Matter Physics and the one in charge of conducting research on the Pandora Box. Fearing an attack from Touto's rival nations of Hokuto and Seito, Gentoku believed that the only way for Touto to protect itself was to ramp up its military spending, a viewpoint that clashed with the more pacifist and non-aggressive beliefs of both his father and friend Koji Hotei.

While out having fun at a karaoke bar, Gentoku received a call notifying him that researcher Takumi Katsuragi had begun another unauthorized experiment on a human with Nebula Gas. Leading a squad of Touto Special Ops, Gentoku and his men bust into Katsuragi's lab and shut down the experiment. However, Gentoku would later approach Katsuragi the next day, revealing that he had only fired him to cover his tracks from Touto law enforcement. Gentoku brings Katsuragi to the Namba Heavy Industries Laboratory and provides him with an entire lab to continue his research from, but to Katsuragi's delight.

Several months later, the very first Smash is created due to a miscalculation in one of Katsurgi's experiments. A mysterious man shoots the Smash with his Transteam Gun to revert it back to human, and Gentoku recognizes the wielder of the Transteam Gun as Soichi Isurugi, the astronaut who had caused the Skywall Disaster. Isurugi reveals to Gentoku that he was sent by Namba Heavy Industries Ltd. to assist them in their research of the Pandora Box and later offers that they team up, a deal which Gentoku compares to the story of Faust and the demon Mephistopheles. Not trusting Isurugi, Gentoku declines.

Gentoku later meets Hotei again at the karaoke bar and the two sing a song together. After that, the two converse and Hotei reveals that Taizan had decided to make him his successor as Prime Minister, much to Gentoku's surprise. Hotei then thanks Gentoku for talking with him, as it has made him feel much more ready to become Prime Minister before leaaving. As Gentoku departs from the Karaoke place too however, Hotei's dead body drops before him. Soichi then appears and Gentoku realizes he was the one who killed Hotei. Gentoku accepts Soichi's offer to work with him, and later goes to the Namba Industries Laboratory. There he announces to his staff of scientists that they will now be known as Faust and uses the Transteam System Katsuragi designed to transform into Night Rogue for the first time.

Pursuit of Ryuga

The war has begun.
~ Night Rogue as he is observing Sento and Ryuga from atop the Skywall.

Gentoku is first seen being interviewed along with his assistant, Nariaki Utsumi, by Sawa Takigawa, where he states that the Institute's objective is to decipher the Pandora Box before other countries attempt to invade any of the three regions of Japan. The following day, Gentoku accepts Sento Kiryu into the Institute to assist in studying the Pandora Box. The two soon hear of the news that Ryuga Banjou has escaped from prison. Gentoku tells Sento that Ryuga murdered one of the Institute's researchers, Takumi Katsuragi.

The war has begun

Night Rogue observes Sento and Ryuga.

Following Sento's battle with Strong Smash, Gentoku and an army of Touto Guardians and soldiers arrive and demand Build hand over Ryuga. However, Build chooses to instead escape with Ryuga, prompting the Touto forces to go after them. The two are observed escaping by Night Rogue, who comments that "the war has begun."

Night Rogue later kidnapped Ryuga's fiance, Kasumi Ogura, to be turned into a Smash. When Ryuga called her, Night Rogue answered her phone and forced Ryuga to listen as Kasumi was prepared to be injected with Nebula Gas. Following Kasumi's conversion into the Burn Smash, Night Rogue unleashes the monster and sends it to attack Ryuga. With it being too late to save Kasumi due to her being a "Hazard Level 1", Build was forced to kill her to end her suffering. 

After Team Build manages to track down Masahiro Nabeshima, Night Rogue had him contact them by phone in order to lure them into a trap. Rather than hold up his end of the deal and release Nabeshima's family, whom he was holding hostage, Rogue instead opts to turn Nabeshima into the Mirage Smash and sic him on Kamen Rider Build when he shows up. After Build defeats the Mirage Smash and purifies its essence, reverting it back to Nabeshima, Rogue had Blood Stalk retrieve Nabeshima before Sento could obtain any information from him. 

Rogue later injected Nabeshima with Nebula Gas again, turning him into the Square Smash before sending him after Build. The Square Smash's fight with Build was observed by Blood Stalk, who only intervened to enlarge the Smash with Devil Steam before leaving as Build defeated and purified it. Night Rogue later questioned Stalk as to why he let Build live, but Stalk assured him it was all according to plan.

At Faust's backup lair, Gentoku and Utsumi are informed by Blood Stalk that Sento plans to head to Hokuto and that it would disrupt their plan to utilize the Kamen Rider System as a military weapon if Sento got caught by the Hokuto government. Gentoku decides to head to the Skyroad to stop Sento and orders Stalk to accompany him but Stalk refuses. In response, Gentoku turns into Night Rogue and briefly engages him, causing Stalk to concede and agree to accompany Rogue. At the Skyroad, Night Rogue sends several Faust Guardians to capture some Hokuto refugees and threatens to kill them if Build doesn't show himself. Sento turns into Build and fights Rogue while Ryuga, who was dressed as a clown, engages the Guardians. With his bat-like abilities and his Steam Blade's Ice and Elec Steam attacks, Rogue gains the advantage and overpowers Build. Rogue then turns to Ryuga but before he can attack him Build sneak attacks him. As Build and Ryuga ride away on the Machine Builder. Rogue orders Stalk to stop them. Stalk places the Rocket FullBottle in his Steam Rifle and performs a Steam Attack, but triggers it in such a way that it rebounds and almost hits Rogue, giving Build and Ryuga time to escape.

Gentoku later questions Stalk on his methods during Build's fight with a Smash in Hokuto, but Stalk rebuffs the claim and reminds him that the data Takumi Katsuragi hid in Hokuto could be used to not only upgrade and militarize the Rider System. Learning that Sento and Ryuga plan to return to Touto with Kyoka Katsuragi, the mother of Takumi Katsuragi. Believing that she knows where her son's hidden data was located, Night Rogue intercepted Kyoka's car and knocks her out, sending Faust Guardians to fight Build while he brings Kyoka's unconscious body to Faust's lair. At the hideout, Rogue cancels his transformation and interrogates Kyoka on the location of her son's hidden data, offering give her the last letter Takumi wrote to her but never sent if she reveals where it is. Kyoka gives in, telling him that the data is in a safe deposit box at the Touto Bank anding hand Gentoku a badge and key with its number. Gentoku then hands her the "letter", which turns out to just be a blank paper, and tells her that her son wasn't the type of person to show gratitude to his parents. Angered that she had been deceived, Kyoka hits Gentoku causing Utsumi restraints her arm. Gentoku then orders the Faust scientists to administer the Smash element and send her back to Hokuto, causing her memory of him to be wiped.

Gentoku and Utusmi then head to the Touto Bank and open the deposit box but instead of finding the data they find a letter by Takumi in it stating that whoever opened it is untrustworthy. However, just then Utsumi received a call from Blood Stalk, which Utsumi hands to Gentoku. Stalk tells them that Sento and Ryuga have discovered the location of the hidden data, the abandoned Namba Heavy Industries Integrated Sciences Laboratory. Traveling there, Gentoku transforms into Night Rogue and attacks Build while Ryuga fights Stalk. Rogue tells Stalk to leave with the data, but Ryuga continues to go after Stalk. Rogue continues to Rogue battle Build until he sees Stalk toss the drive to Ryuga. Rogue attempts to go after Ryuga but Stalk prevents him from doing so to allow Build and Ryuga to leave. Rogue then asks Stalk what he's scheming to which Stalk says that they do not need the drive, just the tools the data can create and that both Sento and Ryuga can do it.

Theft of the Pandora Box

Gentoku later meets with Faust's benefactor, Juzaburo Namba, in a Touto bathhouse. Namba questions him as to if he has managed get Prime Minister Taizan Himuro of Touto to develop an interest in the Rider System, but Gentoku informs him that his father remains unconvinced. Reminding Gentoku of the money he's placed in Faust, Namba threatens to partner up with either Hokuto or Seito if Gentoku does not turn over the Rider System plans to him.

He later discovers that Ryuga and Misora are going for a walk in public in disguise and sends several Faust Guardians after her. While Ryuga takes the Guardians on, Misora flees and contacts Sento to tell him their location. Night Rogue then appears and attempts to take Misora back to Faust, intimidating her to the point where she faints. Ryuga then attacks Rogue, but is easily overpowered. However, Blood Stalk then arrives and tells Night Rogue not to act behind his back, allowing Ryuga to take Misora and leave. Behind Stalk's back, Rogue sends several more Guardians after Ryuga, but they are all destroyed by Kamen Rider Build.

Returning to a Faust lair with Stalk, Night Rogue informs him of Namba's ultimatum. Cancelling his transformation as Night Rogue, Gentoku is asked by Stalk as to what he intends to do. Gentoku ultimately decides that they should steal the Pandora Box from the Touto Institute of Advanced Matter Physics in order to trigger an all out war between the three Regions of Japan.

Night Rogue vs. Blood Stalk

Night Rogue fights Blood Stalk.

While Stalk infiltrated the Touto Institute of Advanced Matter Physics and stole the Pandora Box, Gentoku remained outside in charge of a response team, observing Stalk through the Institute's security cameras. However, Gentoku grew suspicious after Stalk began shooting the Institute's security cameras, seemingly to cover his tracks. After Stalk stole the Pandora Box and headed to the roof of the building, Gentoku confronted him their, informing him that the roof wasn't part of their escape plan. Stalk tells Gentoku that he got lost, but Gentoku was unconvinced. Transforming into Night Rogue, he demands Stalk hand over the Pandora Box, but Stalk refuses, prompting Night Rogue to attack him.

Their fight was interrupted by Ryuga, who informed them that he beat the Press Smash Hazard Blood Stalk had sent after him but couldn't extract the Smash element without an empty Bottle, surprising Rogue and impressing Stalk. Ryuga then attacked Stalk, but was swiftly defeated due to the injuries he sustained from his previous fight with the Press Smash Hazard. Build HawkGatling then arrives to help him, prompting Night Rogue to assist Stalk against the two of them. While Stalk battled, Ryuga Rogue fought Build. As Stalk overpowered Ryuga, Build FireHedgehog ceased fighting Rogue and attacked Stalk. Rogue then used the opportunity to sneak-attack Build, but this gave Stalk the chance to insert his Cobra Fullbottle into his Steam Rifle and fire a Steam Shot at both Rogue and Build, knocking Rogue to a wall and cancelling Build's transformation. Stalk takes the Pandora Box and leaves.

After Blood Stalk was chased down by Build, Night Rogue shows up from behind Sento and knocks him unconscious before having his Faust Guardians surround Blood Stalk. Questioning Stalk as to where he intended to take the Pandora Box, Stalk tells him he was going to take it back to Faust's lair and offers Rogue the box. Taking the box, Rogue grabs Stalk and warns him not to try something like that again. Before leaving, Rogue takes the Rabbit, Tank and Lion Fullbottles from an unconscious Sento. As Sento returns to consciousness, he grabs Night Rogue's leg, demanding he return the Fullbottles, but Night Rogue just kicks him in the face before walking away laughing.

Gentoku becomes Prime Minister

With his father falling ill, Gentoku assumed the position of acting Prime Minister of Touto. He met with Yoshiko Tajimi, the Prime Minister of Hokuto and Masakuni Mido, the Prime Minister of Seito. At the meeting, Tajimi accused him of collaborating with Faust, but Gentoku replied by suggesting she might have relations with Faust. After the meeting Gentoku was approached by Blood Stalk, who demanded to know why he had placed the Pandora Box in an unknown location and not informed Stalk, but Gentoku told Stalk to act more loyal if he wanted Gentoku to reveal the Box's location. Their conversation was interrupted by two Touto security guards, whom Stalk killed effortlessly. The next day, Gentoku lures Sento and Ryuga into a trap by reporting a false sight of a Smash at an abandoned factory. When Sento and Ryuga arrive, Night Rogue and four Faust Guardians appear to confront them. Rogue demands they give him the last two Fullbottles they have, Sento refuses and instead transforms into Build KeyDragon to do battle. Build While Rogue fights his Faust Guardians take on Ryuga. Though Build overpowers Rogue at first, the power of the Dragon bottle soon starts overwhelm Build and knocks him out of his transformation. Rogue then demands once again that Sento hand over the Fullbottles, but before anything can happen Stalk appears and interrupts the fight. Throwing a chair, Stalk tells them to leave. Angered by Stalk's intervention, Rogue demands to know what Stalk is scheming, but Stalk leaves without answer.

Gentoku later meets up with Namba again at a fishing village. Namba compliments Gentoku for obtaining the Pandora Box but brings up that they need three more Fullbottles for it. Gentoku tells him he will retrieve them before leaving. Soon after, Gentoku is informed by Namba that Sawa Takigawa, who was spying for Faust and Namba Heavy Industries has had her position compromised. Deciding that she has outlived her usefulness, Gentoku has her abducted and taken to Faust's backup lair, where she is administered a dosage of Nebula gas and turned into a Stretch Smash. Rogue films her transformation into the Smash on her camera to show Sento and tells Sento he intends to set the Stretch Smash loose on the city. Setting the Smash loose, Rogue observes from a distance as Kamen Rider Build in his KeyDragon Best Mach fights the Stretch Smash. waiting for. As the Dragon bottle overwhelms him once more, Sento is knocked out of his transformation and falls to the ground. Rogue then walks over to Sento and tells him to hand over the bottles. However, Ryuga shows up and Sento instead tosses the Dragon and Lock bottles to him. Turning his attention away from Sento, Rogue sends the Stretch Smash to attack Ryuga. As Ryuga fights the Smash Rogue prepares to fire his Steam Rifle at him but Sento gets in the way. Annoyed by Sento's continued defiance, Rogue steals the Build Driver from him and tells him that he's done being utilize for Faust. However, Ryuga then takes the driver from Rogue and uses it to transform into Kamen Rider Cross-Z. After defeating the Stretch Smash, Cross-Z charges Rogue. Outmatched by the Rider, Rogue retreats.

Stalk's Betrayal

When Sento and Ryuga head to the Namba Heavy Industries Integrated Science Laboratory in search of the Pandora Box, they are encountered by Night Rogue and four Faust Guardians. Night Rogue tells the two to leave but they refuse. Transforming into Kamen Rider Cross-Z, Ryuga engages Night Rogue while his Faust Guardians take on Sento. While Cross-Z seems to have the advantage at first, Rogue soon overpowers him and reveals that his Hazard Level is still higher than Ryuga's. However, Stalk then appears and interferes in the fight to ask Night Rogue where the box is hidden. Rogue asks Stalk why he is at the laboratory to which Stalk answers that he is there to fight him. The fighting becomes interrupted though Stalk locates both the Pandora Box and the Fullbottles Rogue stole from Sento. As Sento tries to recover his Fullbottles Stalk grabs the Pandora Box and teleports away from it.

While Utsumi treats his wounds, Gentoku is approached by Juzaburo Namba. Gentoku apologizes for letting the Box be stolen, and Namba forgives him, but states that countermeasures must be taken. The two decide to have the Touto government destroy Faust to remove any traces of evidence connecting them to it. The following day, Gentoku stages a confrontation with Faust at a dam, with Gentoku leading the Touto forces while his assistant Nariaki Utsumi poses as Night Rogue. The impostor Night Rogue fights and is quickly defeated by Build KaizokuRessya. The defeat is picked up by the news, with Utsumi being forced out of his transformation and incriminated as the leader of Faust. Utsumi attempts to inform Build of something, but before he can finish speaking Gentoku shoots him and knocks him off the bridge and into the waters below.

Cover Blown

Meeting with Namba again, Gentoku is informed that Namba has found a new partner. He later contacts Blood Stalk and arranges a meeting with him. At the meeting, Gentoku attempts to get Blood Stalk to give up the Box's location. Blood Stalk agrees, but only if Gentoku swears loyalty to him. Gentoku refuses and transforms into Night Rogue to fight Blood Stalk and take the Box by force. Initially beating back Stalk, Night Rogue soon realizes that Stalk was holding back and is swiftly defeated by him. Stalk then reveals that he is Namba's new partner.

Gentoku later reveals to Sento and Ryuga that the Box is in one of Namba Heavy Industries' storage facilities, planning to have the two retrieve the box for him. However, after being exposed as Soichi Isurugi, Blood Stalk reveals to the two that the true identity of Night Rogue is Gentoku Himuro. After Sento and Ryuga succeed in recovering the Box, Gentoku sends a squad of Touto soldiers to break into nascita but they find no traces of the box. Gentoku later meets with Sento and Ryuga in the Touto Institute's parking lot, who reveal that they know Gentoku is Night Rogue and show him the box. After Gentoku reveals his plans to the Riders, Ryuga loses his temper and attacks Gentoku, who transforms into Night Rogue to fight him. Night Rogue manages to overpower both of them and recover the Box, only for it to be revealed to be a hologram, with the whole confrontation being a ruse to expose Night Rogue's true identity.

Hokuto-Touto War

Meeting with the other two Prime Ministers again, Gentoku states that Touto has recovered the Pandora Box. As Masakuni Mido congratulates him, Gentoku tells the two to drop the facade and that all three of them want the energy of the Pandora Box for their own selfish desires. Tajimi at first pretends not to know what Gentoku is talking about, but Gentoku then proceeds to point out how most of Hokuto's budget is spent on its military, angering Tajimi. Gentoku then proposes that the three should see which one could rule Japan, before Tajimi and Mido cut off their transmissions.

The next day, Gentoku is informed that a squad of Hokuto Guardians and two Smash Hazards have crossed the border into Tokyo. Declaring it an act of war, Gentoku informs Sento and Ryuga that this is an invasion. He later sends Touto Special Forces to bring Sento and Ryuga to them, offering to overturn Ryuga's prison sentence if the two fight for Hokuto. While Sento was initially reluctant, Ryuga agreed, and Gentoku provided the two with bracelets that would allow him to monitor their location and contact them at all times.

Defection to Seito

Gentoku's identity as Night Rogue and connections to Faust were later exposed to Taizan Himuro and the Touto government after his father was healed by Misora. Gentoku transformed into Night Rogue and made an attempt to steal that Pandora Box, but was easily fought off by Build.

After being banished from Touto, Gentoku traveled over to Seito to defect tot hem. Heading to the Namba Heavy Industries Seito office, Gentoku approached Nariaki Utsumi and demanded to be made into a Kamen Rider, but Utsumi demanded he kneel first. Begrudgingly, Gentoku complied and kneeled, only for Utsumi to tell him he never promised to make him into a Kamen Rider and leave him chained up in a cell in a Faust compound run by Namba Industries.

However, Gentoku was later approached by Blood Stalk, who offered to train him to raise his Hazard Level so he could become a Kamen Rider. While they already had a candidate to become the Kamen Rider of Seito, Stalk noted to Utsumi that he lacked the drive to obtain more power that Gentoku had. Gentoku was thus transferred to a cell with four other inmates. While one of the inmates was kind, the other three were hostile to him and frequently beat him. In one struggle with the three inmates, Gentoku was brutally beaten to the point of losing consciousness, causing him to be proclaimed as dead and taken to a morgue. However, while he was there he was rescued by two of his old comrades in Faust, Norio Matsui and Yoshikazu Takahashi. Upon waking up, Gentoku hugged both of them and told them he was eternally indebted to them. Gentoku later returned to the Faust compound and murdered the lead candidate for Kamen Rider so he could take his Sclash Driver. He was soon discovered by Stalk and Utsumi and asked the two what they intended to do now that their candidate was no longer qualified to be Seito's Kamen Rider. Impressed with Gentoku's cold-blooded murder, Stalk informed him that he was now in line to become Seito's Kamen Rider.

In order to raise his Hazard Level to the point where he could use the Sclash Driver to transform into Kamen Rider, Stalk had Guardians attack Gentoku all at once, beating him over and over again until he his Hazard Level was finally raised to the point where he could utilize the Sclash Driver. Inserting the Crocodile Fullbottle into his Sclash Driver, Gentoku achieved becoming a Kamen Rider and proclaimed himself as "Kamen Rider Rogue".

With his new power, Gentoku became the Kamen Rider of Seito and the commander of Seito's forces, spearheading their invasion into Touto. He made an attempt to seize the Pandora Box as Taizan was having it moved to a new location.

Eventually, a three-on-three representative match was agreed upon by the nations in which Seito's three champions would fight the three champions of Touto for possession of the Pandora Box and Fullbottles. Rogue thus fought Build in the third round of representative battle, following one victory for Touto and one victory for Seito. Mocking Sento for his insistence that science was only a tool for war, Gentoku rejected Sento's claims that science could be used for peace, asking him why he had designed the Hazard Trigger as Katsuragi if not for war. While Sento was pondering what Gentoku had said, Rogue used the opportunity to get an attack in on him. Despite he initially having the advantage, the tables soon turned against Rogue when Build revealed his RabbitRabbit form and promptly beat Rogue down. However, Namba Heavy Industries had received the data on Build's RabbitRabbit form from Sawa Takigawa, whom they had blackmailed into working for them again by holding the Nabeshima family hostage. Nariaki Utsumi thus downloaded the data into Rogue's systems, allowing him to gain the edge out over Build once again. Unbeknownst to Rogue and Namba Industries, Sawa had secretly told Sento about her ties with Namba Industries and what they had done with the Nabeshimas. The two thus plotted to outsmart the company by only leaking half of Sento's research data. After Grease rescued the Nabeshimas from Seito's Guardians, Sawa received the go-ahead from Grease and passed it on to Sento, who changed from his RabbitRabbit form to his TankTank form, which Namba had no data on. Unprepared to deal with Build's new form, Rogue was beaten down and defeated by him, clamining the third round for Touto and allowing them to win the representative match.

Despite losing, Namba refused to allow the Pandora Box to be handed over, and killed and swapped faces with Seito's Prime Minister Masakuni Mido when he attempted to honor the deal. However, Gentoku disagreed with how Namba intended to use the Pandora Box to take over the world and overheard Namba reveal he had assumed the identity of Mido. During a fight with Build, Rogue revealed that Namba was impersonating Mido and that he had a chip implanted in him set to go off should he disobey or go against Namba.

Rogue was later tasked with guarding the captured workers of Kazumi Sawatari's farm when Seito attempted to use them to extort Kazumi into trading them the Pandora Box in exchange for freeing them, lest they be executed. Kazumi refused and, rather than carry out his orders and execute them, Rogue instead let them go.

Redemption

Capturing Taizan to prove his loyalty to Namba, Gentoku later set his his father free and attempted to escape. However, he was confronted by Utsumi. Stalk then activated Gentoku's kill switch, immobilizing the Rider and foiling his escape attempt.

However, Gentoku's kill switch had been deactivated by Sento beforehand, allowing him to go on to fight alongside Sento and Banjou as Rogue. Rogue later assisted Build, Cross-Z and Grease in fighting against Stalk. After Stalk was defeated by Cross-Z Magma, he attempted to escape but was pursued by Rogue. Rogue then defeated Stalk again and canceled Evolt's transformation.

However, thanks to Utsumi, Evolt gained the Evol Driver and used the Cobra and Rider Evolbottles to transform into Kamen Rider Evol. Evol then defeated Rogue and caused Gentoku to revert his transformation. He attempted to finish Gentoku off, but his attacked was blocked by Taizan, who sacrificed himself to save his son. Before dying, Taizan asked Gentoku rebuild Japan as a whole and acknowledged Gentoku as his being his son.

Fighting alongside Build

Siding with Team Build, Gentoku vowed to atone for his sins by reuniting Japan and laying the foundation for a new generation. However, there was still some uneasiness among Build's allies, especially Kazumi, due to Gentoku having killed Akaba, though Kazumi eventually would encourage Gentoku to keep trying to make up for his past actions.

After Utsumi went insane and sided with Evolt to become Kamen Rider Mad Rogue following Namba's death, Gentoku blamed himself for Utsumi's turn over to Evolt, having been the one to shoot him at the confrontation at the dam. When Utsumi led an attack on Touto, Gentoku attempted to go and confront him, but proved too injured from his previous defeat by Utsumi as Mad Rogue to do so.

Later, as the nascita crew were discussing Evolt's actions and speculating as to what his true plans were, they realized that most of the people who had been turned into Smash were people with a connection to Shinobu Katsuragi. They asked Gentoku if he had information on that, but Gentoku denied knowing anything claiming that Smash conversions was Stalk's department in Faust and not his.

Death

After Evolt revealed his extraterrestrial origins to the world and announced his intentions to destroy it, he challenged the Kamen Riders to a final battle to decide the fate of planet. Alongside his fellow Kamen Riders, Gentoku showed up to confront Evolt at the summit of the Pandora Tower. Evolt then explained to them the rules of their fight: they would have to reach the top of the Pandora Tower and for every ten minutes that they didn't he would destroy a section of Japan. After Evolt teleported off and sent his army of Hard Guardians after them, Gentoku and the others transformed into their Rider forms and obliterated the Hard Guardians by combining their attacks.

Making their way inside the tower, after Grease stayed behind to fight the Hokuto Three Crow mimics, Rogue, Build and Cross-Z found themselves confronted by mimics of Remocon Bro's and Engine Bro's. Telling Build and Cross-Z to go on without him, Rogue stayed behind to fight them. He soon receives backup in the form of Mad Rogue, who reveals he was only pretending to be on Evolt's side all along. The clones then merge to form Hell Bro's, but the two Riders manage to destroy it with their combined power, causing it to drop the Hammer Lost Bottle. Kamen Rider Evol then shows up to claim the Lost Bottle and fights the two Riders, knocking Gentoku out of his transformation and fatally injuring Utsumi, who is revealed to be a cyborg.

Evol then attempts to finish Gentoku and Sawa off with the Steam Blade, but Utsumi gets up to block the attack, sacrificing himself to give the two time to gather the Lost Bottle and escape by teleporting away.

At the top of the Pandora Tower, Gentoku, along with Sento, Ryuga and Sawa, learned from Misora that Kazumi had been killed. Evolt then showed up to fight the three remaining Riders. Evol easily manages to beat down Rogue before overpowering Build and stealing the two remaining. Lost Bottles he needed to become his final form. After transforming into his monster form, Evol beats down the three Riders again and knocks Sento and Ryuga out of their transformations before creating a massive black hole to begin consume the Earth.

Despite his injuries, Rogue refused to go down and attempted to fight Evolt by himself. Despite his best efforts and determination, Rogue was unable to do any damage against Evolt and was overwhelmed by the alien's power, having part of his faceplate shattered in the process. Not ready to go down just yet, Gentoku switched tactics from attempting to fight Evolt to going for the Evol Trigger, the source of Evolt's power. He succeeds in landing a powerful blow to it and damaging it, but this did not stop Evolt from critically wounding him. Reverting from his transformation, Gentoku began to fade away. As he reached the end of his life, Gentoku entrusted the future of the world Sento, whom he acknowledged as "Sento Kiryu" instead of "Takumi Katsuragi" for his first and only time before dying.

New World

In the new world creating by merging the World of Build into the main Kamen Rider world, Gentoku was seen acting as an aid to his father Taizan Himuro, who was now the Prime Minister of all of Japan. He was shown agreeing to an interview from Sawa Takigawa.

Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z

Gentoku regains his memories of the old world along with the rest of Team Build as well as those who were experimented on with Nebula Gas after Killbus forces Ryuga Banjo to recreate the Pandora's Box. Remembering his old friends, Gentoku summons them all to the Touto government building where Sento explains to them the threat of Killbus.

Rogue and Grease later show up to rescue Ryuga as he was being beat down by Killbus, teleporting away with him and Yui.

In the final battle against Killbus, Rogue and Grease held off the Smash summoned by Killbus while Cross-Z and Evol took on the Blood Tribe King himself. After the battle was over and Killbus was destroyed, Gentoku was surprised to see Yui hug Ryuga, asking via t-shirt if they were a "best match" while Kazumi gets mad and accuses Ryuga of trying to "flex".

Other Appearances

Transformation Lessons ~The Laws Of Transformation Are Set!~

Gentoku Himuro appears in the second episode "Night Rogue Chapter" where he attempts to film a video of him transforming into Night Rogue for FausTube, but has to restart several times after his cameramen tell him he is acting too scary. Eventually, Gentoku is able to complete his transformation into Night Rogue. He then attempts to demonstrate his Steam Rifle's finisher, Steam Shot, only for it to destroy the camera, ending the video.

Personality

As Night Rogue, Gentoku displays an arrogant and cold personality, treating people as mere guinea pigs and gleefully experimenting on them. He seems to enjoy using people's loved ones against them in order to keep them under his thumb, or just to be cruel to them, as shown when he turned Ryuga's girlfriend Kasumi into a Smash and made him listen as the transformation was taking place. Gentoku was also quick to let out emotional outbursts, and is susceptible to episodes of paranoia and aggression, desperately attempting to convince his father to improve the military believing that Hokuto and Seito are out to invade Touto. This paranoid and controlling personality stemmed from his exposure from the Pandora Box.

As his regular self, Gentoku keeps a composed and cool demeanor, though he switches to a fierce one when he is commanding his soldiers. He also seems to care for his father, and was worried for him when he suffered a heart attack that left him in the hospital, though this was soon superceded by his glee at the fact that this left him as the acting Prime Minister of Touto.

Post his redemption, Gentoku generally remains silent, having become somewhat emotionless due to the training he endured to become Kamen Rider Rogue. He is also shown to feel guilty for the crimes he committed in the past as Night Rogue and the commander of Seito's forces, and displays a desire to atone and lay the foundation for a new generation. As revealed by Evolt, Gentoku's nicer personality is due to his Hazard Level being above 4 and thus nullifying that Pandora Box's effects on his personality that made him power hungry and cruel.

Eventually, Gentoku begins to display the more comedic aspects of his personality to the rest of Team Build. He is shown to have a rather odd fashion sense, preferring overly extravagant clothes that are generally odd for a casual setting, such as the Jamaican-style robes and hat he wears in episode 41. He also seems to have a preference for dress shirts.

Quotes

Sento: Kamen Rider Build, the ‘brilliant’ physicist Kiryu Sento, is shocked to find he is the founder of the evil organization Faust, Katsuragi Takumi. Not a long after, a war begins with Hokuto. Sento has resolved to fight, in order to protect Touto.
Gentoku: I see. So you've made your decision, then.
Sento: Whoa, Gentoku...
Gentoku: Call me Prime Minister Himuro. The time has come for Touto's counterattack. We'll crush Hokuto!
Sento: When you put it that way, maybe I should reconsider...
Gentoku: Then I wouldn't put it that way.
Sento: You're so fickle! Now, what'll happen on Episode 18?
~ Gentoku in the recap for episode 19.


Gentoku: I feel like my characterization is odd lately.
Sento: You just noticed?
Gentoku: But what's the cause? Is it because I can't buy a train ticket on my own? That I refuse to eat green peppers? Or because I can’t sleep without a light on!?
Sento: You're such a kid! Now, will you be wearing another novelty T-shirt in Episode 41?
~ Gentoku in the recap for episode 41.

Gallery

Forms

Images

Night Rogue

Kamen Rider Rogue

Trivia

  • Gentoku participates in the opening recaps for episodes 19, 41 and 45.
  • Gentoku is the only one of the six Kamen Riders in the show to not be possessed by Evolt at any point in time.
  • After being fatally wounded in the final battle against Evolt, Gentoku's shadow stays as his Kamen Rider form despite him having been blasted out of his transformation, signifying that he has become a true hero.

Navigation

           BUILD LOGO Villains

Faust
Night Rogue | Blood Stalk | Takumi Katsuragi | Shinobu Katsuragi | Nariaki Utsumi | Shingo Kuwata | Eita Kawai | Masahiro Nabeshima | Norio Matsui | Yoshikazu Takahashi | Faust Guardians

Hokuto
Yoshiko Tajimi | Blood Stalk | Kazumi Sawatari | Hokuto Three Crows | Akaba | Aoba | Kiba | Massugu Ubukata | Hokuto Guardians

Seito
Masakuni Mido | Kamen Rider Rogue | Fu Washio | Rai Washio | Seito Guardians | Hard Guardians

Namba Heavy Industries Ltd.
Juzaburo Namba | Nariaki Utsumi | Fu Washio | Rai Washio | Sawa Takigawa | Kaisei Mogami | Guardians | Hard Guardians

Blood Tribe
Kengo Ino | Ryoka Saiga | Mitsuomi Gohara | Evolt | Killbus

Smash
Needle Smash | Strong Smash | Burn Smash | Flying Smash | Press Smash | Ice Smash | Stretch Smash

Downfall
Simon Marcus | Keiji Uraga | Guardians | Hard Guardians

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