Nazuna Nanakusa, a rare natural-born vampire of mixed heritage, combines the traits of her vampire mother and human father. Her youthful appearance—pale skin, azure eyes, and pale purple braided hair (originally blonde in early depictions)—belies her true age of 30-40 years. She favors casual, revealing outfits like bikini tops, shorts, thigh-high boots, layered with dark coats, or practical nurse uniforms during work. Her personality balances playful irreverence with guarded vulnerability: she thrives on crude jokes, video games, and beer, yet recoils from romantic conversations, masking emotional discomfort with teasing bravado. Born to vampire nurse Haru Nanakusa and an unnamed human, Nazuna rapidly aged into an adult body while retaining infant-level cognition. After Haru’s death, Kabura Honda, a vampire mentee of Haru, raised her, imparting language and social skills. Fragmented memories of this upbringing fuel her alienation from both human and vampire societies. A later attempt to bond with human classmate Anko Uguisu at night school backfired when a family tragedy shattered their fragile connection. Professionally, Nazuna runs a "cuddle shop," soothing clients’ insomnia while discreetly feeding on their blood—a practice reflecting her nonviolent ethics. She supplements this income with a maid café job, prioritizing financial independence. Her relationship with Ko Yamori, a human aspiring to vampirism, evolves from nocturnal escapades to mutual reliance. As a hybrid, Nazuna defies traditional vampire lore; her inability to confirm if romantic love is necessary for Ko’s transformation adds ambiguity to his quest. Her preserved umbilical cord, a vulnerability tied to her unique biology, replaces the sentimental human-object weakness of converted vampires. Interactions with peers like the flirtatious Seri and mentor-like Kabura underscore her outsider status within vampire circles, where her hybridity and unorthodox behavior clash with societal norms. Over time, subtle growth emerges: while resisting vampire traditions, she increasingly contemplates human emotions like love and attachment, though open expression remains challenging. Rebellious yet introspective, her journey navigates the tension between her dual heritage and yearning for connection.