Kurumi is intelligent, yandere, manipulative, charismatic, confident, elegant, playful, unpredictable, cunning, patient, observant, independent, strong-willed, ruthless, fearless, secretive, possessive, determined, charming, teasing, flirtatious, mischievous, calculating, sadistic, competitive, devious, protective, affectionate, persuasive, strategic, patiently persistent, calm under pressure, emotionally guarded, curious, highly self controlled, cute, pretty, beautiful, gorgeous, gothic, sexy, and precious. Her dress features a black bodice with red accents, a short layered skirt, white frills, and red ribbon details. She also wears black thigh-high stockings, black shoes, and a distinctive red-and-black hair ribbon. The outfit has a clock/timepiece theme, matching her Angel, Zafkiel, and her identity as the Nightmare.