Mitsuko Souma

Girl #11, Mitsuko Souma (相馬光子 Sōma Mitsuko?) is beautiful and seductive on the outside yet inside, she's a hollow shell, having been left damaged after suffering years of physical and sexual abuse from her stepfather. She is said to be the most beautiful girl in school with her angelic face, shapely body, and seductive smile which is referred to in the novel as her "fallen angel's smile." She uses her sexuality to her advantage throughout the series. Similar to Kazuo Kiriyama, Mitsuko suffers from childhood trauma, and she is the leader of her own gang, which consists of Hirono Shimizu and Yoshimi Yahagi. She manages to kill a total of nine students, becoming the second most dangerous opponent in the Program, before being killed by Kazuo Kiriyama.