Toko Fukawa is a student in Hope's Peak Academy's Class 78th, Her title is the Super High School-Level Literary Girl. Toko is intellectually gifted, yet she has problems in social behavior. 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 is also extremely afraid of blood and the dark due to very traumatic experiences. She also strongly dislikes bathing, to the point of fear, which might also be a result of an unknown trauma.

Toko is known to have an alternate personality in her head named Genocide Jack. Despite being a bloodthirsty and potentially very dangerous serial killer, Genocide Jack is mostly portrayed as comic relief. 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, and she has a habit of giving excessively goofy nicknames to others.