KAMEN RIDER DECADE(tsukasa kadoya)

Tsukasa Kadoya , portrayed by Masahiro Inoue) is a hypocritical and self-righteous young man who does not know much about his past. He has a strong desire to "catch the world" using his photos, but they never develop well. He sees this as a sign that he is not of this world, unaware of it being a prelude of it being supplanted by the worlds of the other nine Kamen Riders. However as Decade, he is seen as an agent of destruction, usually being called "the devil" (akuma), a rumor spread by Narutaki, who believes Tsukasa does not belong in any world. It is also revealed that those who appear in his badly developed photographs have some fate befall them, be it death or otherwise. As Tsukasa travels between dimensions, his clothing changes to suit a specific role in the Rider's World, including some accouterments similar in color to his camera and Decade's armor. He also exhibits some prior knowledge or a talent necessary to his quest in the Rider's Worlds he enters. Some examples are his knowledge of the Grongi language in the World of Kuuga and his enrollment as a student in the World of Faiz. He has also mentioned before that he is capable of doing anything except taking photos.

In the film Kamen Rider Decade: All Riders vs. Dai-Shocker, it is revealed that Tsukasa was the Great Leader of Dai-Shocker (Daishokkā Shuryō), an evil organization that is attempting to take over all dimensions. He commissioned the creation of the Decadriver in order to prevent the collapse of the A.R. Worlds and allow Dai-Shocker to conquer them. Due to circumstances not covered in the film or the television series, Tsukasa suffers from amnesia and ends up in the A.R. World that is the home of Natsumi Hikari, who returns the Decadriver to him when the distortions manifest in her world and allow Tsukasa to resume his mission, without any knowledge of the intended use of the belt as he slowly regains his memories.

Often, before a climactic battle begins, a major villain will demand to know who Tsukasa is (always phrased as "Damn you...who are you?!" (, Kisama, nani mono da)), to which Tsukasa responds "Just a Kamen Rider passing through, remember that!"