Genocider Sho
Toko Fukawa is a major character in the Danganronpa series who serves as one of the four tritagonists (alongside Byakuya Togami, Aoi Asahina and Yasuhiro Hagakure) of Danganronpa Trigger Happy Havoc, the deuteragonist of Danganronpa Another Episode: Ultra Despair Girls, and a supporting character in Danganronpa 3 The End of Hope's Peak High School. She is a student of Hope's Peak Academy with the title of Ultimate Writing Prodigy.
She also has a split personality named Genocider Sho (Genocide Jack/Jill in the English Game Version) also known as the ultimate murderous fiend (it is unknown if this tile was given officially by Hopes Peak or is self claimed), who used to be a serial killer.