Icon-w.png This article is about a/an villain in Kamen Rider W.

"I told you before, I also love this city."
―Kirihiko's genuine words[src]

Kirihiko Sudo (須藤 霧彦 Sudō Kirihiko) was a character in Kamen Rider W. At the beginning, he was known by his original surname until changing it to Sonozaki after he married Saeko Sonozaki. In later episodes after he was killed by Saeko he is referred to by his original surname. Despite being a member of the Museum and Sonozaki Family, Kirihiko is more of a neutral character due to being unfamiliar with the Sonozaki's plans.

Fictional character biography


When Kirihiko was a child he and his younger sister, Yukie attended a kindergarten in Futo City. It was there were he invented the future mascot of Futo, Futo-kun. Years later, an adult Kirihiko got a job as one of the Museum's top Gaia Memory dealers. He also attracted the attention of the eldest daughter of the Sonozaki Family, Saeko.


Kirihiko has a professed love of Futo City, to the extent of creating its mascot, Futo-kun in his childhood. He would do anything to help Futo. Unfortunately this lead to him getting a job for the Museum, unaware of its true intentions. After marrying Saeko, Kirihiko does everything in his power to help his new family (e.g. assisting Saeko in Gaia Memory distribution, dealing with Kamen Rider Double, and trying to help Wakana Sonozaki with her stalker problem). When he learned of the Museum's goal, he decided to rebel against them even helping his 'rival' Double destroy the evolved Bird Memory. Before leaving for good he tells Saeko that he can't help the Museum anymore but still loves her and tried to get her to come with him, to no avail.


When first introduced, Kirihiko became married to Saeko after she spared him, unlike some of her other boyfriends. He is then given a Gaia Driver and the gold Nasca Memory to become the Nasca Dopant. For most of his appearances, he is often with overseeing events on the Gaia Memories and fighting with the Sonozaki family against Double, who he sees as a rival after seeing one of his two identities (Shotaro Hidari) transform. After going through secret training to his Level 2 powers and finding the temple underneath the Sonozaki Estate where the Museum's ambitions are explained to him by Ryubee while suffering near-lethal side effects for reaching Level 2, Kirihiko decides to fight against the Museum and helps Double defeat the Bird Dopant. He tries to get Saeko to come with him out of love but instead she kills him as a threat to her own plans for the Museum while taking the Nasca Memory with her. His death then becomes the main point of the Yesterday Dopant case.

Video Game appearances

Kamen Rider Travelers Record

The Nasca Dopant appears in the video game Kamen Rider Travelers Record.

Kamen Rider: Battride War Genesis

Nasca Dopant in Kamen Rider: Battride War Genesis

The Nasca Dopant appears as a boss in Kamen Rider: Battride War Genesis

Kamen Rider: memory of heroez

Kirihiko was revived by the Zeus Dopant and appears as the first boss of the game, fought by Kamen Rider Double. Shotaro instantly recognizes him as Kirihiko, though he refers to himself as nothing but a dead man before fighting the Rider. After their fight, Kirihiko recovers his memory and willingly takes a fatal blow from Double. Before his subsequent death, he asks Shotaro if the wind in Futo still blows as it used to.


As one of the top Gaia Memory dealers Kirihiko can find ways to sell the Gaia Memories to just about anyone with a good compatibility with them. He also seems to have a rather strong will as he seemingly didn`t go mad when he was hit by the Terror Dopant`s attacks.

Dopant Form

Main article: Nasca Dopant

Nasca Dopant

―Transformation announcement[src]
  • ​Height: 215cm
  • Weight: 112kg

In being welcomed into the family, he is granted a Gaia Driver along with the ability to become the Nasca Dopant (ナスカ・ドーパント Nasuka Dōpanto), an expert swordsman armed with the Nasca Blade (ナスカブレード Nasuka Burēdo) with the powers of flight from the Nasca Wings (ナスカウイング Nasuka Uingu). He also managed to withstand the Terror Dopant`s attacks without canceling his transformation which is notable as even W in CycloneJokerXtreme Form initially couldn't do so.

Appearances: W Episodes 3, 4, 6, 9-11, 14, 16-18

Net Movies Appearance

Kirihiko makes a non-canon appearance in the Kamen Rider W net movies. He returns from the dead to host a talk show called "Kirihiko's room: the Talk Revenge". In this show he confronts multiple villains and asks them confronting questions, only to be physically abused by most of them.

Here is the list of skits:

  • Wakana Sonozaki: Kirihiko confronts her about gaining weight, referencing her transformation into Claydoll Xtreme. He gets slapped in the face for it.
  • Saeko Sonozaki: Kirihiko talks about various things involving Saeko's role in the story, like the red Nasca and Taboo. He gets confronted by a video of Isaka and Saeko being in love and calls this his second death blow.
  • Shinkuro Isaka: Isaka returns from the dead and talks about Saeko, being defeated by AccelTrial. Kirihiko and Isaka decide to work together against Kazu. But when Isaka explains Jun's habit of dropping things, he drops a dumbbell at Kirihiko's toe.
  • Mick: Kirihiko confronts Mick about trying to kill Saeko and throws him around the room. Mick responds to this by changing into Smilodon Dopant and begins beating up Kirihiko.
  • Jun Kazu: Kirihiko confronts Kazu about his habit of dropping objects and Kazu responds by dropping things on Kirihiko.
  • Futo-kun: Kirihiko has his own creation, Fuuto-kun the city mascot, as his guest. He tells Fuuto-kun that he does not like him acting like an idol, since he was intended to humbly give the city a fresh breeze by spinning the blades on his head. Fuuto-kun obeys Kirihiko and blows some air at Kirihiko. But Futo-kun then decides he wants to get rid of Kirihiko and blows him away with a gust of wind.

Behind the scenes


Yuki Kimisawa assumed the garb of Kirihiko Sudo in 2019 to promote the Futo Detective manga.[1]

Kirihiko Sudo was portrayed by Yuki Kimisawa (君沢 ユウキ Kimisawa Yūki). Kimisawa previously guested in Kamen Rider Den-O.

As the Nasca Dopant, his suit actor was Jun Watanabe (渡辺 淳 Watanabe Jun).

Concept Art

Nasca Dopant concept art

Nasca Dopant was designed by Katsuya Terada (寺田 克也 Terada Katsuya).



Icon-w.png Kamen Rider W
Narumi Detective Agency
Shotaro Hidari - Philip - Akiko Narumi - Sokichi Narumi† - Tokime
Memory Drivers
Double Driver - Accel Driver - Lost Driver
Gaia Memory-related
Gaia Memories - Memory Gadgets - Fang Memory - Xtreme Memory - Trial Memory - Gaia Memory Enhancing Adapter
Metal Shaft - Trigger Magnum - Engine Blade - Skull Magnum - Prism Bicker - Eternal Edge - Shroud Magnum
RevolGarry - HardBoilder - Gunner A - Diablossa - SkullBoilder - SkullGarry - HardMammother
The Fuuto Irregulars
Santa-chan - Watcherman- Queen & Elizabeth - Isamu Bito
Futo Police Department
Ryu Terui - Mikio Jinno - Shun Makura
Museum and the Dopants
Foundation X
The Sonozaki Family: Terror - Claydoll - Taboo/R Nasca - Nasca - Smilodon - Masquerade Dopants
Dopants: Magma Dopant - T-Rex Dopant - Money Dopant - Anomalocaris Dopant - Cockroach Dopant - Sweets Dopant - Virus Dopant - Violence Dopant - Arms Dopant - Bird Dopant - Ice Age Dopant - Triceratops Dopant - Liar Dopant - Puppeteer Dopant - Invisible Dopant - Nightmare Dopant - Beast Dopant - Zone Dopant - Yesterday Dopant - Quetzalcoatlus Dopant - Gene Dopant - Jewel Dopant - Old Dopant - Utopia Dopant - Energy Dopant
Movie Exclusive Villains: Dummy Dopant - Heat Dopant - Trigger Dopant - Metal Dopant - Luna Dopant - Cyclone Dopant - Bat Dopant - Spider Dopant - Kamen Rider Eternal - Commander Dopant - Eyes Dopant
Novel-Exclusive Villains (The One Who Continues After Z): Zoo Dopant - Zero Dopant - Queen Bee Dopant - Flower Dopant - Elephant Dopant - Dolphin Dopant - Salamander Dopant - Fish Dopant - Bird Dopant - Ape Dopant - Bee Dopants
Manga Exclusive Villains (Futo Detective): Road Dopant - Aurora Dopant - Meganeura Dopant -Brachiosaurus Dopant - Scream Dopant - Alcohol Dopant - Puzzle Dopant - Reactor Dopant - Antlion Dopant - Owl Dopant - Trash Dopant - Caracal Dopant - Toadstool Dopant
Yukiji Bando - Kazuha - Hideo - Mamoru Nikaido - Sabu
Katsumi Daido - Maria S. Cranberry - Reika Hanehara - Kyosui Izumi - Gozo Domoto - Ken Ashihara
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