She was the Mastermind behind Danganronpa V3: Killing Harmony, Tsumugi is a very skilled cosplayer at Hope's Peak Academy able to cosplay any fictional character's appearance and their voice. She has a habit of saying "it's plain to see" whenever she talks due to her Plain Jane personality. As the mastermind she is highly affliated with Team Danganronpa who created the reality show series. She believes that she rather die than live without Danganronpa or fiction in general. she breaks 4th walls