This article is about a/an Rider in Kamen Rider Build.
Kazumi Sawatari
Kazumi Sawatari
Kamen Rider Grease
Gender: Male
Series: Kamen Rider Build
Motif: Robot
Rider Type: Anti-Hero
Affiliation: Hokuto
Homeworld: Earth
First Appearance: Kamen Rider Heisei Generations FINAL: Build & Ex-Aid with Legend Riders[1]
Last Appearance: TBA
Number of Episode
1 (Movies)
TBA (Build)
1 (Special)
Full list of appearances
Actor: Kouhei Takeda
Kamen Rider Grease
Grease Profile

"The fire of my heart...passion..."
―Kazumi's creed for fighting.[src]

"Fan the flame and crush everything!"
―Kazumi catchphrase before fighting[src]

"Kamen Rider Grease...arrives."
―Kazumi's introduction to Build and Cross-Z.[src]

"This is it! This is the battle I wanted!"
―Kazumi's excitement in a fight under the influence of the Sclash Driver.[src]

Kazumi Sawatari (猿渡 一海 Sawatari Kazumi)[2] is Kamen Rider Grease (仮面ライダーグリス Kamen Raidā Gurisu), who hails from Hokuto and is the leader of the Hokuto Three Crows.

Character History

According to Sawa report, Kazumi was once an owner of a farmland in Hokuto, with Akaba, Aoba and Kiba as his workers. However, Sky Wall Disaster changed the soil composition in Hokuto, thereby make Kazumi farm infertile and suffer massive loss.

Kazumi decided to use all his savings to help all of his workers family. Until one day, his saving is empty and he can't even buy food for all of them. Having no other choice, Kazumi willingly enlist himself into Faust human experiment in Hokuto to ensure their survival. The experiment wipes his past memories as result, but Kazumi was ignorant about it.

Shortly before Hokuto invaded Touto for the Pandora Box, Kazumi was chosen to lead a strike team in charge of retrieving Touto's Fullbottles and Pandora Box panels. He was given a Sclash Driver by Soichi Isurugi, allowing to become Kamen Rider Grease.

Hokuto-Touto War

Kamen Rider Grease stole the Phoenix and Robot Fullbottles from Sento. Kamen Rider Heisei Generations FINAL: Build & Ex-Aid with Legend Riders

As Kamen Rider Grease, Kazumi led the Hokuto advance into Touto once war was declared by Prime Minister Yoshiko Tajimi. Penetrating the Skywall, Grease destroyed many Touto Guardians. The Weaponry Hero

Ryuga Banjou encountered him as he searched for the Hokuto Three Crows. A Strong Smash Hazard appeared and began attacking bystanders, and as Ryuga put on the Build Driver, Kazumi destroyed the Smash in one punch using his hidden Helicopter Fullbottle before leaving. Later, after Ryuga and Sento had defeated the Hokuto Three Crows in Ryuga's first fight as Cross-Z Charge, Kazumi showed up to challenge them with his own Sclash Driver. Rider Wars Start


Kazumi's demeanor alternates between calm and composed to maniacal and ruthless, depending on whether he's fighting or not. Presumably due to his usage of the Sclash Driver, Kazumi is obsessed with battle and finding a worthy opponent. He is not afraid to use lethal methods, going as far to even try to deliver a Rider Kick at an untransformed Banjou.

However, Kazumi operates by a certain code: he insists on not targeting civilians as long as they stay out of the way, and decided against taking Build's FullBottles due to him butting in the battle, much to the trio and Hokuto Prime Minister dismay. Kazumi is an avid fan of Mii-tan, allowing Sento and Banjou to escape and cancelled Akaba's attack, since Misora is the one who helped them.

He is also secretly cares about his underlings, as he is against with the Prime Minister and Stalk's idea of giving the Three Crows more power by strengthening them with the Hazard Trigger, knowing that they gonna die after they are defeated. After the Three Crows become Hazard Smashes, Kazumi was visibly frustrated.

Powers and Abilities

  • Fullbottle Augmentation: By using a Fullbottle in his hand without transforming, Kazumi can gain abilities based on said Fullbottle's traits:
    • Helicopter: Allows Kazumi to perform fiery punches. First used to defeat a Strong Smash Hazard.


  • Mii-Tan: Since Kazumi is a huge fan of Mii-tan, he quickly loses his fighting will and even allows his enemy to escape if Misora is the one who helped them. It's hinted that he might have a crush on Mii-tan, but when Akaba asked him about his apparent crush and the possibility of her being Sento's girlfriend, Kazumi denied it by claiming that Mii-Tan is everyone's idol.



Kamen Rider Grease

"Tsubureru! Nagareru! Afurederu! Robot In Grease! Buraa!"
―Transformation announcement[src]

Rider Statistics

  • Rider Height: 203.0 cm
  • Rider Weight: 118.3 kg

Ability Perimeters:

  • Punching Power: 31.3 tons
  • Kicking Power: 34.3 tons
  • Maximum Jump Height: 54.0 m
  • Maximum Running Speed: 100 m. per 2.5 sec.

Grease's base form is accessed by inserting the Robot Sclashjelly into the Sclash Driver and pumping the lever.

Unlike Cross-Z Charge who has more punching power, Grease has more kicking power. Besides that, Grease shares similar stats with Cross-Z charge in terms of jumping power and speed.

Also, as he is presumably much more experienced with the Sclash Driver, he is able to fight against and defeat Cross-Z Charge at ease, even when the latter has similar power stats as him.

Grease's personal weapon is the Twin Breaker.

Grease has two different finishers:

  • Sclash Driver finisher:
    • Scrap Finish (スクラップフィニッシュ Sukurappu Finisshu):
      • Rider Kick (ライダーキック Raidākikku): Grease uses his Machine Pack Shoulder (マシンパックショルダー Mashinpakkushorudā) to generate black grease-like energy like a rocket in order to propel himself forward as he delivers a Rider Kick to the enemy, coated in gold energy.
      • Rider Punch (ライダーパンチ Raidāpanchi):
    • Discharge Crash (ディスチャージクラッシュ Disuchāji Kurasshu):
      • Helicopter Fullbottle: Grease creates a helicopter blade in his right arm, gaining the ability to fly.
      • Keshigomu Fullbottle: Grease creates a big eraser that allows him and or his comrades to flee.
  • Twin Breaker finishers:
    • Beam Mode:
      • Single Finish (シングルフィニッシュ Shinguru Finisshu): Grease channels the energy of a Fullbottle or the Robot Sclashjelly and performs a powerful blast.
        • Fullbottle:
        • Sclashjelly:
          • Robot: Grease shoots the enemy with gold lightning in rapid succession.
      • Twin Finish (ツインフィニッシュ Tsuin Finisshu): Grease channels the energy of 2 Fullbottles or a Fullbottle and the Robot Sclashjelly and performs a powerful blast.
        • 2 Fullbottles:
          • Smapho + Televi: The Twin Breaker makes a TV-like barrier, which then shoots energy smartphones at the enemy.
        • Fullbottle + Sclashjelly:
          • Helicopter + Robot: Grease shoots the enemy with projections of gold helicopter blades.
    • Attack Mode:
      • Single Break (シングルブレーク Shinguru Burēku): Grease channels the energy of a Fullbottle or the Robot Sclashjelly and performs a powerful slash.
        • Fullbottle:
        • Sclashjelly:
      • Twin Break (ツインブレイク Tsuin Burēku): Grease channels the energy of 2 Fullbottles or a Fullbottle and the Robot Sclashjelly and performs a powerful slash.
        • 2 Fullbottles:
        • Fullbottle + Sclashjelly:

Appearances: Build Episodes 16, 18-20, Kamen Rider Build: Birth! KumaTelevi!! VS Kamen Rider Grease![2]




Behind the Scenes


Kazumi Sawatari is portrayed by Kouhei Takeda (武田 航平 Takeda Kōhei), who is more previously well known for his portrayal of Otoya Kurenai in Kamen Rider Kiva. As Kamen Rider Grease, his suit actor is Satoshi Fujita (藤田 慧 Fujita Satoshi).


Following Sento and Ryuga, one of the kanji used to spell his name also represents an animal, Sa (), which poetically means "monkey". It can be refer to grease monkey, an English slang term for the mechanics.


  • Kamen Rider Grease's helmet design is very similar to Kamen Rider Ghost Mugen Damashii's helmet design.



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