She's got long, beautiful black hair that apparently screams "traditional Japanese beauty" to Kimito when he first meets her—he literally compares her to a Yamato Nadeshiko. She carries an actual katana at her waist and developed her own sword technique, which she naturally named after herself. People around her find her pretty intimidating; they'll straight-up call her scary.
Despite what comes out of her mouth, she's not great at hiding what she actually thinks. When she encounters something she likes, she'll say it's "pointless" or act dismissive, but her real enthusiasm is obvious to anyone paying attention.
Content compiled by AnimeList.moe from publicly available sources.