This article is about a/an villain in Kamen Rider Build.

Killbus (キルバス Kirubasu) is the former ruler of the Blood Tribe and the main antagonist of Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z.[1]. After destroying his own planet, he spends an entire year looking for his young brother Evolto until he reaches Earth. Upon arriving, he takes the form of Sento Kiryu and steals his Build Driver, later opting for the appearance of Satoshi Kakizaki, who he later uses as his main host to transform into Kamen Rider Killbus (仮面ライダーキルバス Kamen Raidā Kirubasu).

Character History

Sometime before the start of the series, Killbus was responsible for the destruction of the Blood Tribe home planet, Planet Blood, as well as the one giving them orders to destroy other planets. Before the destruction of said planet, Evolto escaped with Pandora's Box in hopes of making sure Killbas doesn't find it, prompting the latter to search for Evolto.

After the World of Build was merged into the World of Kamen Rider, Killbus arrived via the White Pandora Panel and copies the appearance of Sento Kiryu and later Satoshi Kakizaki. Taking the Build Driver from Sento, Killbas obtains the means to transform into his Kamen Rider form, Kamen Rider Killbus , which is even stronger than Kamen Rider Evol. Killbus plans to restore the energy of the Pandora Box and use it to destroy the entire universe.

Later on, he fought Ryuga Banjou, and his brother, over the Pandora's Box. Due to the Box reappearing into the New World, everyone from the original World of Build got their erased memories back, excluding Sento and Ryuga as they had kept their memories during the transfer. Despite having the upper hand initally due to his rider form being stronger than Evolto, Ryuga assumed a new form, Cross-Z Evol, the fusion of his and Evolto's powers, later gaining the upper hand against him, and destroying him and the reconstructed Pandora's Box except for the original White Pandora Panel.


Killbus has a hedonistic personality and seeks pleasure from destruction, which led to the destruction of his own planet. He wishes to use the Pandora Box to destroy the entire universe, even willing to die along with it. He does not show any type of sibling care for Evolto, even willing to kill him just so he can have the Pandora Box all for himself.

Killbus seems to be more attracted to Satoshi Kakizaki, opting to take his appearance instead of the geeky Sento Kiryu.

Powers and Abilities

  • Hazard Level 3+: Killbus has a Hazard Level of at least 3, as shown by his use of the Build Driver. However, his Hazard Level is likely to be at least 5+ due to him being a member of the Blood Tribe and besting Evolto in battle. Throughout the film, he effortlessly defeats Ryuga, who has a recorded Hazard Level of 7, implying that Killbas may also have the same Hazard Level as well (or higher).
Killbas Liquid Form

Killbas liquifies himself.

  • Liquefaction: Like Evolto, Killbus can become a teal pool of liquid for transportation purposes.
  • Venomous Tentacle: Killbus possesses a tentacle that he can use to inject his opponent with a dangerous venom. This can be countered with the Genius Fullbottle.
  • Shape-Shifting: While his true form has not been revealed, Killbus can mimic any human due to being a member of the Blood Tribe. He first took the form Sento Kiryu before settling on the appearance of Satoshi Kakizaki.
  • Infusion: Killbus infused Sento's pet spider robot with his own genes in order to create the Killbuspider.
  • Fullbottle Creation: Killbus created the Killbas Spider Fullbottle using his own genes.


Kamen Rider Killbus
"Killbuspider! Are you ready? Spider! Spider! Killbus Spider!"
―Transformation announcement[src]

Rider Statistics

  • Height: 194.5 cm.
  • Weight: 109.1 kg.

Ability Perimeters[2]:

  • Punching power: 66.1 t.
  • Kicking power: 72.4 t.
  • Maximum jump height: 88.9 m.
  • Maximum running speed: 100 m. per 0.9 sec.

Killbus transforms into Kamen Rider Killbus (仮面ライダーキルバス Kamen Raidā Kirubasu) by using the Killbuspider, with the Killbus Spider Fullbottle inserted, in the Build Driver.

Killbus' finisher is the Killbus Spider Finish (キルバススパイダーフィニッシュ Kirubasu Supaidā Finisshu), which has two variations:

  • Killbus dashes around the enemy while binding them with webbing so that they cannot move before he strikes them with his gigantic four spider legs, exploding the enemy in process.
  • Killbus attaches strands of webbing to the enemy and throws them into the air before delivering a spinning heel kick.

Appearances: Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z

In any form that uses the Rabbit Fullbottle, Build is armed with the Rabbit Foot Shoes (ラビットフットシューズ Rabitto Futto Shūzu) on his left leg for increased jumping, and can summon the Drill Crusher.

RabbitTank Form

RabbitTank Form

"Rabbit! Tank! Are you ready? (Techno rock music) Hagane no Moonsault! RabbitTank!"
―RabbitTank's transformation announcement[src]

Rider Statistics

  • Rider Height: 196.0 cm.
  • Rider Weight: 99.0 kg.

Ability Perimeters:

  • Punching Power: 14.7 t. (right arm)/25.2 t. (left arm)
  • Kicking Power: 35.1 t. (right leg)/26.3 t. (left leg)
  • Maximum Jump Height: 71.5 m.
  • Maximum Running Speed: 100 m. per 1.9 sec.

RabbitTank Form (ラビットタンクフォーム Rabitto Tanku Fōmu) is Build's red and blue primary and default Best Match form form accessed from the Rabbit and Tank Fullbottles, hence known as the Moonsault of Steel (鋼のムーンサルト Hagane no Mūnsaruto). It is themed after a rabbit and a tank.

RabbitTank is considered to be the most well balanced; having a good amount of power and agility in all of his Ability Perimeters, thus making it Build's default form, despite it being capable of initiating transformation with any set of Build's Fullbottles. This is also Build's second fastest form.

In this Best Match form, Build is armed with the Tank Roller Shoes (タンクローラーシューズ Tanku Rōrā Shūzu) on his right leg for kicking attacks, and can also act as a working tread to roll along on a flat foot.

This form's weapon is the Drill Crusher.

Appearances: Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z

In any form that uses the Harinezumi Fullbottle, Build is armed with the Spine Knuckle (スパインナックル Supain Nakkuru) on his right fist, allowing him to clobber foes with spikes that extend outwards when used.

FireHedgehog Form

FireHedgehog Form

"Harinezumi! Syoubousya! Best Match! Are you ready? (Rock music with sirens) Rescue Kenzan! FireHedgehog! Yeahhh!"
―FireHedgehog's transformation announcement[src]

Rider Statistics

  • Rider Height: 190 cm.
  • Rider Weight: 103.7 kg.

Ability Parameters:

  • Punching Power: 13.7 t. (right arm)/11.9 t. (left arm)
  • Kicking Power: 14.7 t. (right leg)/14 t. (left leg)
  • Maximum Jump Height: 36.5 m.
  • Maximum Running Speed: 100 m. per 6.4 sec.

FireHedgehog Form (ファイヤヘッジホッグフォーム Faiya Hejjihoggu Fōmu) is Build's white and scarlet-colored Best Match form accessed from the Harinezumi and Syoubousya Fullbottles, hence known as the Rescue Kenzan (レスキュー剣山 Resukyū Kenzan). It is a Touto Best Match, and is themed after a hedgehog and a fire engine.

In this Best Match form, Build is armed with the Multi Deluge Gun (マルチデリュージガン Maruchi Deryūji Gan) on his left arm that can shoot water, fire, or extend.

This form give build balanced boost in punching, kicking and jumping power, albeit at the cost of his running speed.

Appearances: Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z



  • Build Driver - Transformation device, stolen from Sento Kiryu.
  • Killbuspider[3] - Kamen Rider Killbus' slot adapter for the Build Driver. Technically stolen from Ryuga's belongings.
  • Fullbottles - Transformation trinkets. Stole Rabbit, Tank, Harinezumi, and Syoubousya from Sento. Later created one on his own.


Behind the Scenes


Killbus is voiced by Anri Katsu (勝 杏里 Katsu Anri), who previously voiced Roidmude 106/Thief in Kamen Rider Drive. When copying Satoshi Kakizaki’s appearance, he is played by Gaku Shindo (進藤 学 Shindo Gaku), who is best known for his role as BarizorgIcon-crosswiki from Kaizoku Sentai GokaigerIcon-crosswiki. As Kamen Rider Killbas, his suit actor is Yasuhiko Imai (今井 靖彦 Imai Yasuhiko)[4].

When copying Sento Kiryu's appearance, he is portrayed by Atsuhiro Inukai (犬飼 貴丈 Inukai Atsuhiro).


  • Killbus' spider motif finished the last 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, following Blood Stalk's cobra motif and Night Rogue's bat motif.
  • Killbus is the final movie-exclusive Kamen Rider to debut during the Heisei Era.
  • Like previous V-Cinema Exclusive Riders, Killbus is made up of recycled parts from previous Rider suits. His helmet uses elements of Night Rogue/MadRogue's helmets, the shoulder and gauntlet parts are from Blood Stalk, bicep armor taken from either Blood Stalk, Night Rogue or MadRogue, as well as the standard Kamen Rider Build leg armor parts.
  • Kamen Rider Killbus' general design also feels reminiscent of Kamen Rider Saver, albeit vaguely. Both feature a primarily red color scheme, and Killbas is seen dual-wielding a sword and a bow-and-arrow weapon. The latter may only be applicable to a single scene, however.


Sento Kiryu - Ryuga Banjo - Kazumi Sawatari - Gentoku Himuro - Evolto - Nariaki Utsumi - Shinobu Katsuragi - Kengo Ino - Killbus - Keiji Uraga
Transformation Gear
Fullbottles - Build Driver - Transteam Gun - (Great) Cross-Z Dragon - Sclashjellies - Sclash Driver - Hazard Trigger - Nebulasteam Gun - Cross-Z Magma Knuckle - Evol-Driver - Evol-Trigger - Grease Blizzard Knuckle - Killbuspider - Grease Perfect Kingdom
Drill Crusher - Hawk Gatlinger - 4Koma Ninpoutou - Kaizoku Hassyar - Fullbottle Buster - Steam Blade - Beat Closer - Twin Breaker - Muscle Glove - Solstall Wings - Giant Scratcher - Space Ride Arm - Spine Knuckle - Long Range Cleaner - Trash Converter - Gold Lio Gauntlet - Multi Deluge Gun
Pandora Box - Halfbodies - Fullbottle Holder - Build Phone
Vortex Finish - Hazard Level - Project Build - Sky Wall - Nebula Gas
nascita: Misora Isurugi - Soichi Isurugi - Sawa Takigawa - Kazumi Sawatari - Gentoku Himuro
Prime Ministers: Taizan Himuro (Touto) - Yoshiko Tajimi (Hokuto) - Masakuni Mido (Seito)
Namba Heavy Industries Ltd.: Juzaburo Namba - Nariaki Utsumi - Guardian
Hell Bro's: Fu Washio - Rai Washio
Aliens: Vernage
Downfall: Keiji Uraga - Simon Marcus
Gentoku Himuro - Evolto - Nariaki Utsumi - Takumi Katsuragi - Shingo Kuwata - Eita Kawai
Touto: Needle Smash - Strong Smash - Burn Smash - Flying Smash - Mirage Smash - Square Smash - Press Smash - Ice Smash - Stretch Smash
Hokuto: Castle Hard Smash - Stag Hard Smash - Owl Hard Smash
Kaiser: Kaisei Mogami (World of Ex-Aid)
Kengo Ino - Ryoka Saiga - Mitsuomi Gobara - Evolto - Killbus