Tsubasa is a soft-spoken girl with a kind heart and a positive personality. Her top grades make her a favorite of the teachers, while her approachable character makes admirers out of her classmates. Tsubasa is also a wealth of information due to her study habits, but keeps humble about it, always stating that "I don’t know everything, I just know what I know" to those who commend her knowledge (although it should be noted that she only says this to Koyomi as this catchphrase makes Koyomi happy). She is never seen angry, but even when she does get mad, she retains her positive appearance, and often resorts to scolding the offender like a teacher, only to show a smile afterwards.