The protagonist of the show Kamen Rider Den-O.
Played by Satoh Takeru.
Birth date: December 26, 1988
The human form of Den-O.
When Den-O first came out, he was advertised as the weakest Rider in history (in contrast to Kabuto being the strongest). But thanks to the teamwork from Imagin who possess him, they are able to make Den-O a powerful Rider.
Hana's nickname for young Ryoutarou. Comes from the kanji for little (ko) 小 and Ryoutarou.
Played by Mizoguchi Takuya.