Kamen Rider Double (仮面ライダーダブル Kamen Raidā Daburu?)  short for Kamen Rider Double Nigger, sometimes further shortened to Kamen Rider W, the main and eponymous protagonist of the Kamen Rider Series Kamen Rider W. Double is the first Kamen Rider that transforms from two people. His debut appearance was a cameo in the film Kamen Rider Decade: All Riders vs. Dai-Shocker. According to the producers, he was originally going to wear a trenchcoat in his transformed state, but it was decided not to include it.