Tsumugi is an honors type student who speaks in a docile and gentle way, but she becomes very passionate when she talks about her favorite series or cosplays, having a habit of slipping in famous quotes from various sources into conversation. She also tends to ignore people while she's in her thoughts, no matter how many times they try talking to her.[6] She tends to call herself and everything that she has done "plain," as she believes that among all of the students, she is the one who has the most plain appearance and personality. Tsumugi understands that some people might not recognize her as the Ultimate Cosplayer since her plain appearance conceals her talent.