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

"Hi! Double's left half."
―Reika greeting to Shotaro[src]

Reika Hanehara (羽原 レイカ Hanehara Reika) was the only female member of NEVER. In Kamen Rider W Forever: A to Z/The Gaia Memories of Fate, she becomes the Heat Dopant (ヒート・ドーパント Hīto Dōpanto).


Mortally wounded, Reika Hanehara dies for the first time.

She was formerly a serial criminal who was gunned down while attempting to escape from Alcatraz Prison to avoid the death penalty. She is turned into the newest of the Necro-Overs in the group. Coming to grips with her new existence, Reika hates the cold feeling of her undead body. Captured by Doctor Prospect's men, she helps Katsumi Daido in saving the Quarks before she is horrified to see the change in his personality after their deaths. However, regardless of the complete change, Reika believed there was some good left in Daido. Following Daido to Futo, she uses the T2 Heat Memory to transform into the Heat Dopant with control over fire. She fights against Kamen Rider Joker but is defeated by his Rider Kick Maximum Drive. She manages to reach Futo Tower before starting to disintegrate, begging Daido for aid. However, she's rebuffed and has only enough time to curse Daido for his cold heartedness before vanishing in Shotaro's arms.

Appearances in other media

Futo Detective

Reika with her fellow NEVER members as seen in Futo Detective

Reika and her fellow NEVER members appears in Futo Detective Chapter 77 Flashback.

Video Game appearances

Kamen Rider Riderbout

Heat Dopant as seen in Kamen Rider Riderbout

Heat Dopant appears as an of the many Bosses, with the other Heisei and Showa kamen Riders in Kamen Rider Riderbout.


Can emit flames from her body and has a high body temprature.

Dopant Form

Heat Dopant

Main article: Heat Dopant
―Transformation announcement[src]
  • Height: 178
  • Weight: 80

She used the T2 Heat Memory to transform. As the Heat Dopant, Reika gained the ability to use the element of fire. She also has her own bike to escape from Double.



Behind the scenes


Reika Hanehara is portrayed by Minase Yashiro (八代 みなせ Yashiro Minase), who later portrays Kaori Kinoshita in Kamen Rider Zi-O. She previously portrayed Ami Hyuga, the lead in The Machine Girl. As the Heat Dopant, her suit actor is Sanae Hitomi (人見 早苗 Hitomi Sanae).

Concept Art

Heat Dopant concept art

Heat Dopant concept art was designed by Katsuya Terada (寺田 克也 Terada Katsuya).


  • In real life, Reika couldn't have escaped from Alcatraz, due to the prison being closed since 1963, which was 8 years before the airing of the first episode of Kamen Rider.



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