Kamen Riders are this city's symbol of hope!

―Shotaro rejecting Eternal's claims of being a Kamen Rider[src]

Shotaro Hidari (左 翔太郎, Hidari Shōtarō) is one of the two main protagonists of Kamen Rider W. He is a private investigator of the Narumi Detective Office who transforms into the left-side of Kamen Rider Double (仮面ライダーダブル, Kamen Raidā Daburu) with Philip on the right-side. Alone, he transforms into Kamen Rider Joker (仮面ライダージョーカー, Kamen Raidā Jōkā).

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―Philip's words before entering the Gaia Library[src]

Philip (フィリップ, Firippu) is one of the two main protagonists of Kamen Rider W. Born Raito Sonozaki (園咲 来人, Sonozaki Raito), he is the mysterious partner of Shotaro Hidari at the Narumi Detective Office who transforms into the right-half of Kamen Rider Double (仮面ライダーダブル, Kamen Raidā Daburu).