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

"Fate is truly as interesting as it is ironic."
―first words to Double[src]

Kyosui Izumi (泉 京水 Izumi Kyōsui) was a flamboyant gay man with sadomasochist quirks member of NEVER who serves as Katsumi Daido's right hand man. In Kamen Rider W Forever: A to Z/The Gaia Memories of Fate, he becomes the Luna Dopant.

Kyosui Izumi

Mortally wounded, Kyosui Izumi dies for the first time.

Izumi is a gay man with sadomasochist quirks and was once a yakuza subordinate until he was betrayed and fatally stabbed in the chest. After he was revived, he fell in love with Katsumi as he was the last thing he saw before his death, tending to call him 'Katsumi-chan' and get jealous of anyone who gets too close to him. Should anyone question Katsumi's motives, Izumi would always stick up for Katsumi and explain his reasons. He would follow Katsumi without question and went on nearly every mission with him.

In the Futo City mission of the retrieval of the 26 T2 Gaia Memories to convert all of Fuuto into Necro-Overs, he gains the T2 Luna Memory, and during his last clash with Kamen Rider Double, he proved to be a resiliant wall, until he fought Kamen Rider OOO and was defeated by the Rider's OOO Bash Scanning Charge, turning into dust instantly.

The Fateful Sengoku Movie Battle

A Luna Dopant created by the God Tree was part of a monsters army led by Nepenthes Inhumanoid appeared to Prevent Wizard, Beast, Gaim, Ryugen, Baron, and Zangetsu from stopping Bujin Gaim from acquiring the ultimate power. He was defeated by OOO Arms's OOO Bash with the Medajalibur along with the Metal Dopant, Hagetaka Yummy, and Sphinx. Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle

Appearances in other media

Futo Detective

Kyosui with his fellow NEVER members as seen in Futo Detective

Kyosui and his fellow NEVER members appears in Futo Detective Chapter 77 Flashback.


Izumi is an expert in grappling and can wrap himself around an opponent's body to snap it like a twig. His main weapon is a whip which he uses to great effect.

Dopant Form

Main article: Luna Dopant

Luna Dopant

―Transformation announcement[src]
  • Height: 242 cm
  • Weight: 120 kg

He used T2 Luna Memory to transform. As the Luna Dopant, Izumi gains the ability to create illusions so powerful that they're nearly indistinguishable from reality. His main uses are to create swarms of T2 Masquerade Dopants and extending his whip like arms to any distance in order to attack.

Behind the scenes


Kyosui Izumi is portrayed by former mixed martial artist Genki Sudo (須藤 元気 Sudō Genki).[1] As the Luna Dopant, his suit actor is Yugo Fujii (藤井 祐伍 Fujii Yūgo).

Concept Art

Luna Dopant concept art

Luna Dopant concept art 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