Nua Nakamachi forms one half of the Nakamachi twins, sharing her age and second-year high school status with her sister Rua. She performs as a member of the idol unit Cream Anmitsu. Her striking appearance features distinct flamingo-pink hair, amber eyes, and a consistent outfit: a beige and orange striped jacket layered over a navy dress skirt, a green tie, white pantyhose, and green shoes. She stands 1.46 meters tall, weighs 36 kilograms, has blood type AB, and celebrates her birthday on January 1.

Nua presents a brash, competitive exterior, often quick with insults and rarely reflecting on her own actions. She becomes easily flustered by her frequent mistakes and clumsiness. Beneath this surface lies masochistic tendencies; she enjoys both physical and emotional pain, and her mistakes may subconsciously invite criticism, particularly from Rua. Despite her competitive nature, she secretly harbors admiration for certain figures, denying being a fan of Brocco while singing his theme song privately, and desiring an autograph from Roko Sekino.

Her defining dynamic is her relationship with twin sister Rua, who exhibits sadistic traits and takes pleasure in Nua's suffering, often worsening her distress. Nua's masochistic disposition aligns with this, appearing to welcome or seek such treatment from Rua. Within Cream Anmitsu, Nua performs alongside Rua and Chiko Sekino, the unit positioned as a professional counterpart to the main idol group Fruit Tart.