This article is about a/an villain turned ally in Kamen Rider Drive.
"If he had killed me, I would have caused him to commit the most heinous of crimes!"
―Reiko confessing the real agenda of her schemes.[src]

Reiko Nishihori (西堀 令子 Nishihori Reiko) is the daughter of Koya Nishihori, the psycho criminal Shinnosuke Tomari arrested in Kamen Rider Drive Episode 0. She made a contract with the Roidmude 050 by making a perfect crime under a pseudonym Yoriko Soma (相馬 頼子 Sōma Yoriko) and targets Go Shijima. She was, however defeated by Drive Type Formula and arrested under the charge of attempted murder and kidnapping.

Character History

Reiko Nishihori is the daughter of Koya Nishihori, the Copycat Pirate that was known for committing multiple kidnappings in front of the public. After her father was captured by officer Shinnosuke Tomari and his Roidmude twin, Roidmude 005 destroyed, Reiko developed a huge vendetta against the Kamen Riders. Due to this, she was synchronized with Roidmude 050 to become Seeker Roidmude.

First by targeting real estate agent Ryo Soma, she used his data of household areas and made the whole population gone mad (Reiko partly helping the Plain Roidmudes to get human synchronizes for the Fusion Evolution State). She as well targeted Go Shijima / Kamen Rider Mach and create a fake identity of Yoriko Soma, using his family relation to Kiriko in order to get close to him. After successfully put Go under her trance, she as Seeker willingly had herself injured by Mach in order to escalate his anger until Chaser tried to stop him from his rage that would ended up killing Reiko, but eventually gets himself retaliated by Mach until Drive comes in and knocks Mach out of transformation. Enraged by Drive's interference, Seeker tried to attack him, but overpowered by Type Formula and get separated by Type Formula Mantarn's Resurrection Fuel-backed punches, splitting into Reiko and 050. In the end, Drive Type Formula Mantarn finishes 050 with Trailer Impact.

Reiko's defeat.

Reiko's defeat.

While Reiko was unmasked, she revealed that her true plan wasn't only for avenging her dad's imprisonment, but also to make Go commit the greatest crime from her death, that being to make a Kamen Rider (the face of justice) commit the most heinous crime by murdering her in cold blood. She was later arrested by Shinnosuke. But, Reiko also breaking down to tears, which make Go realize that she and him are one the same.

Kamen Rider Drive Saga: Kamen Rider Mach

"I just want to be happy!"
―Reiko lets go of her past.[src]

Reiko, finally falling in love with Go, kissing him

A rough two years after the end of Drive, Reiko is released from prison with help from Go, but is met with under circumstances that crept her out. She receives a text message from Go that he wanted to apologize, but little did she know was that she was under Roidmude 005's trap, and only made her the prime suspect in a series of murder cases. Go helps her escape and she tells him about the circumstances between her father and 005. Wanting to end the curse of being the daughter of a monster, she wants to end things with 005, but ends up getting kidnapped and held hostage. Watching Go get killed, she realizes that all she ever wanted was to be happy and rages on 005, before Go is revealed to be still alive. Detective Koichi Kano (possessed by Chase) arrives and helps Go transform into a new version of Mach, which Go uses to defeat 005. Thanking Go, Go is suddenly arrested by Kano for assaulting him earlier.

Days later, Go is released and reunites with Reiko, where they become a couple.

Kamen Rider Drive Saga: Kamen Rider Mach


Seeker Roidmude
KRDr-Seeker Roidmude

Seeker Roidmude

  • Episodes: 27 & 28
  • Motif basis: Wizard, Monk, Mokumokuren
  • Roidmude synchronize: Roidmude 050
  • Seperated by: Kamen Rider Drive Type Formula Mantarn
  • Height: 216 cm
  • Weight: 144 kg

Powers and Abilities

Heavy Acceleration
The signature ability of the Roidmude is to somehow slow down the movement of surrounding objects', including that of humans, with their unaffected consciousness aware of their impass during this time. One can be protected by the Heavy Acceleration effect by carrying Shift Cars or Signal Bikes on their person.
War Manipulation
Seeker Roidmude can induce madness/negative emotion on a population of a housing area to search for perfect human candidate to synchronize with him. This was done by the eyeball tattoo on his palm, shaking hands with the residents, with said tattoo would spread to every unsuspecting neighbours through common touch. Those affected by it shall have eyeball tattoos on their palms.
Coma Inducement
She can quickly removed her trance and set the target in a coma.


Blow Wand (ブロウワンド Burō Wando)
A wand/scythe like weapon, Seeker can use it in melee combat and unleash electrical themed attacks.

Behind the scenes


Reiko Nishinori is portrayed by Haneyuri (はねゆり).


  • To further relate the likeness of Reiko to her father, Reiko was synchronized to Roidmude 050, where said Roidmude's number would turn out to be 005 when the last two digits swap positions.


Icon-drive Kamen Rider Drive
Kamen Riders
TV Series:Shinnosuke Tomari - Go Shijima - Chase - Tenjuro Banno - Kamen Rider Mach (Production Model) (Jun Honganji)
Movie/Special/Stageshow-exclusive: Zoruku Tojo - Kyoichiro Kuroi - Kamen Rider 4 - Paradox Roidmude - Heart - Brain
Special Investigation Unit
Shinnosuke Tomari - Kiriko Shijima - Krim Steinbelt - Jun Honganji - Genpachiro Otta - Rinna Sawagami - Kyu Saijo

Unofficial Members: Roidmude 072 - Go Shijima - Chase - Mitsuhide Nira (defected)

Other allies
Akira Hayase - Harley Hendrickson - Kyoichiro Kuroi - Eisuke Tomari - Eiji Tomari - Ninningers - Ryu Terui - Takumi Inui - Yuto Sakurai - Sakuya Tachibana - Kamen Rider Blade - Kamen Rider Chalice - Kamen Rider Leangle
Creator: Tenjuro Banno

Generals: Heart - Brain - Chase (defected) - Medic - Freeze - Krim Steinbelt (copy) - Roidmude 005 - Roidmude 006 - Tornado - Paradox

Minor Advanced Roidmudes: Reaper Legion - Iron Roidmude - Paint Roidmude - Crush Roidmude - Scooper Roidmude - Volt Roidmude - Gunman Roidmude - Voice Roidmude - Judge Roidmude - Shoot Roidmude - Shocker Buruburu - Angel Roidmude

Fusion Evolution State: Sword Roidmude - Seeker Roidmude - Open Roidmude - Cook Roidmude - Thief Roidmude

Unofficial: Mitsuhide Nira - Sigma Circular

Other villains
Zoruku Tojo - Imitation Drive - Kibaoni Army Corps - Shocker - Neo Shade - Ganma (Da Vinci Gamma)
Mu:Leader of Mu
Executive :Shocker Leader III
Kamen Riders :Kamen Rider Dark Kiva - Kamen Rider Poseidon - Kamen Rider Wiseman - Kamen Rider Duke - Kamen Rider Dark Ghost - Kamen Rider Another Para-DX
Monsters :Cancer Zodiarts - Gremlin - Demushu - Gamma Superior - Graphite
Community content is available under CC-BY-SA unless otherwise noted.