This article is about a/an villain in Kamen Rider Build.
Gentoku Himuro
Gentoku Himuro profile
Night Rogue
Gender: Male
Series: Kamen Rider Build
Motif: Bat
Steam Engine
Villain Type: Leader
Affiliation: Touto Institute of Advanced Matter Physics
Homeworld: TBA
Height: 197.5 cm
Weight: 103.0 kg
First Appearance: That One with the Best Match
Last Appearance: TBA
Number of Episode
TBA (Build)
Full list of appearances
Actor: Kensei Mikami
Night Rogue
Night Rogue

"Blood Steam."
―Night Rogue's transformation catchphrase.[src]

"The war has begun..."
―Night Rogue's first words in the show[src]

Gentoku Himuro (氷室 幻徳 Himuro Gentoku) is one of the main villains in Kamen Rider Build. The head of the Touto Institute of Advanced Matter Physics, he is also the current acting Prime Minster of Touto, after taking over the role from his hospitalized father, Taizan Himuro.[1]. Gentoku is also the leader of Faust, and the true idenity of Night Rogue (ナイトローグ Naito Rōgu), informally known to Build as simply the Bat Man (蝙蝠男 Kōmori Otoko). He is a mysterious masked figure that is present during Faust's experiments that turn victims into Smash, including the one from Sento Kiryu's memories.[2] The Devil's Scientist

Character History

Gentoku was in the audience of the return ceremony when the Skywall was raised. Within a decade of the disaster, he became an aide to the Prime Minister of Touto, overseeing research of Pandora Box. He later watches over the human experimentation it conducts and appears in Sento Kiryu's mostly forgotten memories from before his escape, sitting atop a throne. That One with the Best Match According to Gentoku himself, the reason behind these experimentations is to accomplish one of Faust's objectives: to create the "Ultimate Lifeform." The Testimony Will Be Zero

Gentoku was seen possessing the Rocket Fullbottle. Blood Stalk later uses this bottle with his Transteam Gun before it is stolen by Ryuuga and given to Sento. 


"One of our objectives is to create the ultimate lifeform. 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 shows his malicious nature[src]
Gentoku Malice

Gentoku's Malicious Nature

Gentoku is a composed and generally calm man, rarely changing his tone of voice unless agitated. Underneath his cool exterior, he is a man with questionable morals at best: he flirted with a journalist, and referred to Ryuga and Kamen Rider Build as toys, as well as his fiery temper whenever he commands his soldiers. During a conversation with Gentoku, Blood Stalk reveals that Gentoku's goal is to mass produce Kamen Rider technology from his experiments for military use. To what reason or purpose is unclear, but Gentoku seems determined to see this project succeed and will do everything he can to silence or stop anyone who will interfere with this plan.

It is likely that some of his negative personality traits are a result of his exposure to Pandora Box during the Skywall disaster. One of those traits seems to be episodes of paranoia and aggression, urging his father that they need a military to crush Seito and Hokuto before they crush Touto, believing they are out to get the capital and superior military might can stop their advance.

As Night Rogue, he is very malicious. Seeing innocent people as mere guinea pigs, he doesn't hesitate to experiment on them, even when fully knowing that his subjects would be too weak to survive. Despite his cold and calculating personality, Rogue has his own standards and shows little to no tolerance with insubordination. He is easily vexed each time Stalk goes against his orders, which drives a wedge between their collaboration.


KRBu-Night Rogue

Night Rogue

"Bat! Mistmatch! Bat...Ba-Bat... Fire!"
―Transformation announcement[src]
  • Height: 197.5 cm.
  • Weight: 103.0 kg.

Ability Perimeters:

  • Punching power: 17.2 t.
  • Kicking power: 20.5 t.
  • Maximum jump height: 49.0 m.
  • Maximum running speed: 100 m. per 4.1 sec.

Like Blood Stalk, Night Rogue's form is accessed with the Transteam Gun and the Bat Fullbottle.

Night Rogue seems to possess a degree of steam manipulation as he can turn himself into steam to quickly travel long distances or to summon his Steam Blade. Night Rouge is also shown to be able to fly as well as stand upside down by using his feet to somehow cling to ceilings like a real bat. He can also execute an electrified Rider Punch-esque attack where his fist glows blue with electric energy and hits the target.

Unlike Build, Night Rogue's Ability Perimeters are not spread out between his arms and legs. While Night Rogue gets power from only one Fullbottle, he's much stronger than Build's Trial Forms and his stats even surpass some of Build's Best Matches. He is also able to overpower Blood Stalk in one-on-one combat, despite having marginally lower stats.

With the Steam Blade or the Steam Rifle, he can use the following attacks:

  • Elek Steam (エレキスチーム Ereki Suchīmu): Night Rogue shoots electricity at the enemy.
  • Ice Steam (アイススチーム Aisu Suchīmu): Night Rogue performs a series of icy slashes at the enemy causing them to freeze.
  • Devil Steam (デビルスチーム Debiru Suchīmu): Night Rogue fires a "steam" bullet which will home in on the target and inject them with an unknown compound when it hits them. When used on a human, the person will turn into a Smash. When used on a Smash, the Smash will grow to gigantic proportions.

Night Rogue has 4 finishers:

  • Transtream Gun finishers:
    • Steam Break (スチームブレイク Suchīmu Bureiku): Night Rouge channels the powers of a Faust Fullbottle and performs a powerful blast attack.
      • Bat:
    • Steam Attack (スチームアタック Suchīmu Atakku): Night Rouge channels the powers of a normal Fullbottle and performs a powerful blast attack.
  • Steam Rifle finishers:
    • Steam Shot (スチームショット Suchīmu Shotto): Night Rouge channels the powers of a Faust Fullbottle and performs a powerful steam blast attack.
      • Bat:
    • Steam Attack (スチームアタック Suchīmu Atakku): Night Rouge channels the powers of a normal Fullbottle and performs a powerful steam blast attack.

Appearances: Build Episodes 1-7, Transformation Lessons (Night Rogue), Build 8-11




  • Steam Blade - Standard sidearm weapon. Can combine with the Transteam Gun to form the Steam Rifle.

Behind the Scenes


Gentoku is portrayed by Kensei Mikami (水上 剣星 Mikami Kensei). As Night Rogue, his suit actor is Jun Watanabe (渡辺淳 Watanabe Jun), who played Secondary Riders since Kamen Rider Drive.


Night Rogue's name is a loose play on English words "Nitro" and "Rogue".


  • Gentoku is similar to Kuroto Dan from the previous season as both were first introduced as allies were later revealed to be the identities of prominent antagonists (Kamen Rider Genm for Kuroto and Night Rogue for Gentoku). Also, while in their alter-egos they fight the Kamen Riders, in their true identities they pretend to aid them to secretly study them for their purposes (Kuroto studied the evolution of his first four Kamen Riders for the completion of Kamen Rider Chronicle while Gentoku is not truly interested in studying any evolution of Build, he does it under Blood Stalk's influence to create Kamen Riders for military purposes).
    • Unlike Kuroto, however, Gentoku embodies a "knight templar"-type of lawful evil because of his fears of the neighboring rivals trying to attack Touto and the aforementioned goals of using the Rider systems for war.
  • Gentoku's overall temper, when angered makes him similar to Takeshi Kurosaki of Kamen Rider Amazons.
  • He is a Kamen Rider-like villain and the main Rider's arch-enemy similar to Shadow Moon and Chase, the latter whom when he was still Mashin Chaser.
  • Night Rogue's bat motif, along with Blood Stalk's cobra motif, is part of the recurring bat/cobra/spider trio in the Kamen Rider franchise, a tribute to the first two Shocker monsters as well as the first monster to be upgraded.



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