|This article is about a/an actor in Kamen Rider Den-O.|
Beginning with the character's brief appearance in Kamen Rider Decade, and continuing throughout the Cho Den-O Series, Takuya Mizoguchi portrays Ryotaro. Mizoguchi had originally portrayed the younger iteration of Ryotaro called "Kotaro" in the Kamen Rider Den-O: I'm Born! film.
He also starred in the live action film adaptation of the Bakuman manga. He portrayed Moritaka Mashiro.