Like Kamen Rider Double, Ryu Terui transforms into Kamen Rider Accel (仮面ライダーアクセル, Kamen Raidā Akuseru) through the use of USB flash drive-like objects called Gaia Memories. However, Accel only has access to a single form with which he fights through the use of the Accel Memory which he inserts into the Acceldriver

Ryu Terui (照井 竜, Terui Ryū) is the superintendent of Futo PD's Paranormal Crime Division who transforms into Kamen Rider Accel (仮面ライダーアクセル, Kamen Raidā Akuseru).

Ryu Terui was born to his parents Yuji Terui and Mayumi Terui, and had a younger sister Haruko Terui. As an adult, his family were killed by the Weather Dopant who froze them solid and shattered them to death. Before his father died, Ryu was told to beware of the "Man with the W Memory". Ryu, however, went the opposite direction and sought for revenge with the aid of the mysterious Shroud, who supplied him with the Engineblade as he headed for Futo.

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