Kira Kozukenosuke - Grand Master of Ceremonies for the Shogun.
Tokugawa Tsunayoshi - Shogun ruler of Japan.
Oishi Kuranosuke - Onof the chief retainers of Lord Asano, and the leader of the forty-seven samurai.
Oishi Chikara - Son of Kuranosuke, he is sixteen years old.
Jiro - A servant boy to Oishi Kuranosuke, the hero of the book. Jiro is reffered to in the book as "The Fly".
Haru - Jiro's Mother, a servant of little importance.
Matsu - Chief servent to Oishi Kuranosuke.
Yoshida Chuzaemon - Loyal retainer to Lord Asano.
Hara Soemon - Retainer of Lord Asano.
Okajima Yasoemon - Retainer of Lord Asano.
Ono - A Disloyal chief retainer of Lord Asano.
Lord Uesugi - Son of Kira Kozukenosuke and is protector.
Goro - Acolyte in the Buddhist temple Reikonin.
Otaka Gengo - Young retainer of Lord Asano who befriends Jiro.
Ichikawa Danjuro - A famous kabuki actor, founder of a dynasty of actors. The present one is Ichikawa Danjuro the Twelfth.
Okuno Shokan - A loyal but disagreeable samurai.
Usagi - A servant girl.
Kamoko - Servant in the floating world.
Chikamatsu Monzaemon - Playwright, sometimes called the Shakespeare of Japan.
O'Karu - A beautiful woman of the floating world.
Uma - A giant porter.