|This article is about a/an Dopant identity in Kamen Rider W.|
The Arms Dopant (アームズ・ドーパント Āmuzu Dōpanto) is able to morph his left forearm into a variety weapons such as a gun and carries around a giant blade-like weapon called the Shield Sword (シールドソード Shrīudo Sōdo). The Arms Dopant has his own personal Honda Valkyrie motorcycle called the Arms Bike (アームズバイク Āmuzu Baiku).
- Main article: Kenji Kurata
The main user of the Arms Memory was Kenji Kurata (倉田 剣児 Kurata Kenji), a member of the Twin Rose (ツインローズ Tsuin Rōzu) burglar team with partner Fuyumi Aso. He was hired by Saeko to lure Philip out of hiding. Given the Arms Memory, it turned Kurata into an uncontrollable sadist as he turned his back on Fuyumi and the morals they followed. The Arms Dopant gone on a burglary spree and claimed to be a Kamen Rider to force Double into the trap, only able to capture Shotaro and Akiko to use as hostages. However, the unexpected return of Kamen Rider Double FangJoker, and eventual control of the form, turns the tables with the Fang Streiser Maximum Drive as the defeated Kurata is left for the police.