Her name is sometimes spelled as Genocider Syo. Genocide Jack/Jill in the English release.
Genocide Jack has the title Ultimate Murderous Fiend (超高校級の「殺人鬼」chō kōkō kyū no “satsujinki” lit. Super High School Level Murderer)
[spoiler][[Fukawa Toko]]'s second personality.[/spoiler]

She has [[long hair|long]] [[brown hair]] worn in [[twin braids]]. She has a [[long tongue]] which is almost always [[tongue out|out]]. Has a crush on [[Togami Byakuya]].
ジェノサイダー翔