I'izuka is the examiner of executions for the Chōshū Clan. After a member of the Chōshū Clan such as Kenshin performs a killing, he goes and takes care of the body. He usually puts a note of warning the Shogunate. He appears to be somewhat skilled at kenjutsu.

I'izuka is later revealed to be a traitor to the Chōshū Clan, working as a spy for the Yaminobu. After the Yaminobu are defeated, he goes off on his own; however, he is assassinated by a younger, unburnt Shishio Makoto and in his final moments states that his luck has run out.