Super High School-Level Literary Girl. Toko is intellectually gifted, yet she has problems in social behavior. It's been stated that she either never learned or never bothered to learn social skills. She even considers herself a 'gloomy outcast', often deciding to distance herself from others. Due to the constant bullying she faced as a child, Toko is highly suspicious of other people, frequently accusing them of thinking bad things about her. She expresses her opinions freely and extremely, which can come across as mean and often rubs people the wrong way, though she claims she is just being honest. She has an unusually quick tendency to self-victimize and she refuses to believe compliments from other people. She also is very self-conscious about her body and tends to think that other people consider her ugly.

Toko develops an alter ego in the franchise, known as Genocide Jack. 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. 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.