Izō in fiction
Several films feature Okada Izō as protagonist, most notably Hideo Gosha's Hitokiri (1969) (portrayed by Shintaro Katsu) and Takashi Miike's Izo (2004). Most recently, the NHK Taiga drama Ryōmaden (2009) features him several times as one of Sakamoto Ryōma's friends and Takechi Hanpeita's assassins. He was portrayed by Japanese actor Takeru Sato.
In manga, Nobuhiro Watsuki based the character Kurogasa Udō Jin-e of his series Rurouni Kenshin on Izō; the author admits that the character bears little resemblance to Izō. Hideaki Sorachi also based Nizo Okada, a character in his work Gintama, on Izō. Masami Kurumada, author of the popular Saint Seiya manga series, more recently added a character to his work, called Capricorn Izō, who is inspired by Okada.
Okada appeared as well in Kengo, a video game based on 9 legendary swordsmen. In the said game, is full name is revealed to be Okada Izō Nobutoshi, and it is explained he uses a Goken style of swordsmanship, meaning to overpower the opponent through physical strength and audacious assaults, much like the Jigen-ryu used by some other Hitokiri of the Bakumatsu period. Okada appears as a character on the 2014 video game Ryū ga Gotoku Ishin!
In 2018 he appeared in the mobile game Fate/Grand Order as an Assassin-class Servant.