Tsukasa Kadoya

"I'm just a passing-through Kamen Rider. Remember that!"

- Tsukasa's answer when asked who he is

Kamen Rider Decade (仮面ライダーディケイド Kamen Raidā Dikeido?, Lit. Masked Rider Decade) is the main protagonist and eponymous character of the Kamen Rider Series Kamen Rider Decade. Decade's name is taken from the English word decade as Decade is the 10th of the Heisei run of the Kamen Rider Series, evidenced by the Roman numeral X (ten) on his chest. His logo features the numbers 453 and 145 below the bar code. These digits correlate to the English letters A, C, D, and E to form the word "DECADE". He is also the first Rider to have a series that crosses over with a Super Sentai TV show, in this case Samurai Sentai Shinkenger, though the honor of being the first Rider to appear in a crossover belongs to his rival Kamen Rider Diend.

Personality
Tsukasa Kadoya (門矢 士 Kadoya Tsukasa?) 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", 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 die or foreshadow events. As Tsukasa travels between dimensions, his clothing changes to suit the Rider's World, including some accouterments similar in color to his camera and Decade. 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 Gurongi language in Kuuga's World and his enrollment as a student in Faiz's World. He has also mentioned before that he is capable of doing anything except for taking photos.

Before a climatic battle begins, Tsukasa answers a major villain's demand for his identity by saying that he is "Just a passing by Kamen Rider, remember that!" (通り過がりの仮面ライダーだ、覚えておけ！ Tōrisugari no Kamen Raidā da, oboeteoke!?).

Tsukasa uses a "Decade Pink" Blackbird, fly 135 Twin Lens Reflex Camera.