Genocide Jack, also known as Genocide Jill and as Genocider Sho in the original Japanese version, is a student by proxy in Hope's Peak Academy's Class 78th, and a participant by proxy of the Killing School Life featured in Danganronpa: Trigger Happy Havoc. Her title is the Ultimate Murderous Fiend. She later returns as one of the main protagonists in Danganronpa Another Episode: Ultra Despair Girls alongside Komaru Naegi and her alter-ego Toko Fukawa. Despite being a bloodthirsty and potentially very dangerous serial killer, Genocide Jack is mostly portrayed as comic relief in the Danganronpa series. She laughs a lot and sometimes pretends to be serious only to reveal that she is just joking. Unlike Toko, Genocide Jack is very loud and outgoing. During Chihiro Fujisaki's murder trial she reveals everything about herself. She obsesses over Byakuya Togami, calling him "Master" in the English version. In the Japanese version, she uses honorifics in such as “-sama” which indicates that she has a submissive side - as this honorific is used primarily in addressing people much higher in rank than oneself. She is quite lewd at times, not hesitant to harass Aoi Asahina over her figure or make inappropriate remarks to other characters. Jack is a self-proclaimed fujoshi and says that she only kills cute boys who 'turn her on'. She also seems to like yuri, though she says that she's not into girls. She has also been portrayed with both sadistic and masochistic traits. She has a habit of giving excessively goofy nicknames to others; for example, she calls Makoto Naegi "Big Mac", "Mahkyutie" and "Macoco Chanel." and calling the late Chihiro "Cherry", Kiyotaka "Tick Tock" and Hifumi "Huffy".