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Official Site: Bandai

is a fictional character in the 2009–2010 Kamen Rider Series Kamen Rider W, and is the series second Kamen Rider after the titlular Kamen Rider Double. The name comes from the English word "acceleration" and his motif is that of the letter A as well as a motorcycle.

is a superintendent appointed to the Futo Police Department's , and is Jinno and Makura's superior. He usually wears a jacket with the Buddhist phrase "spiritual state of nothingness makes even fire itself cool" on the back. Prior to arriving in Futo, Ryu lost his family when they were murdered by a Dopant with a Gaia Memory symbolized by the letter W, driving him to seek revenge against this man. The mysterious woman known only as Shroud assists him, providing him with the Accel Memory and Engine Blade. He also develops a hatred for the city of Futo, seeing it as a gathering place of all kinds of scum. Prior to his series debut, Ryu makes a cameo appearance in a post-credits scene in Kamen Rider × Kamen Rider W & Decade: Movie War 2010 proclaiming that Kamen Rider Double is not the only Kamen Rider in Futo. From then, Ryu watches Shotaro and Philip from afar before formally introducing himself to them just as Shroud provides him with the Accel Driver.

Though he and Shotaro clash at first, Ryu becomes an ally to the Narumi Detective Agency, hiring them as assistants and consultants when it comes to investigating the Dopant crime wave, thus providing them with a steady income. He gradually picks up some of Shotaro's habits in dealing with Dopants even after losing it upon finally finding his family's killer: the Weather Dopant Shinkuro Isaka. After obtaining the Trial Memory from Shroud and learning to use it, Ryu is able to finally take his revenge on the Weather Dopant, using the Trial Maximum Drive to destroy his Gaia Memory, after which Isaka dissolved as a result of his long term abuse of Gaia Memories creeps up on him without the Weather Memory holding the effects at bay. After Isaka's death, Ryu found closure and becomes more open to the others and continues his role as a Kamen Rider to fight off the Dopant crime wave. He began to harbor feelings for Akiko as well, which proved to be mutual. He eventually learns that it was Shroud who gave Isaka the Weather Memory, though she had no idea that his family would suffer as a result. Furthermore, Ryu also learns he has a unique physiology, enabling him to withstand the intense power of certain Gaia Memories. His unique physiology, which enables him to the Terror Dopant's Terror Field, coupled with the coincidental burning hatred formed after his family's murder, were the reasons why he was selected by Shroud. Because of this, Shroud had originally intended for him to assume Shotaro's place as Double using his hatred to enable Double to reach full power, and still intends for him to do so even after Shotaro has long been Philip's partner. However, Ryu has shown Shroud that he can fight with compassion and does not need to be Double to fight, forgiving Shroud for being the indirect cause of his family's demise along the way. Furthermore, after Philip's disappearance after Jun Kazu's defeat, Ryu had grown to love Futo with a desire to protect it, overall a complete turnabout from his initial personality.

While settling into married life with Akiko, Ryu is brought onto a case with involving a woman named Aoi Katsuragi, a member of a pick-pocketing ring with most of her accomplices murdered. In the process, by the Commander Dopant's actions, Ryu finds himself on the lam and his marriage on the verge of a divorce. But once learning the Dopant's identity to be Captain Hiroshi Sagami, Ryu saw in the man the same revenge-driven impulse he was under before and refuses to go back there even when Akiko, the reason for his turnabout, is placed in mortal danger. After using the Gaia Memory Enhancement Adapter to save his wife and bring Sagami to justice, Ryu is able to start anew with Akiko.

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