Tsumugi is a reserved, unassuming, and highly observant individual. She initially comes across as quiet and timid. However, she is actually very polite and considerate, showing kindness and empathy. She is also highly creative and passionate about cosplay, expressing herself through her love for dressing up as characters from various media. Despite her seemingly gentle demeanor, Tsumugi possesses a keen intellect and a sharp eye for detail.