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.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.