Hazuki Nanakusa works as an office assistant at 283 Production. She is 22 years old, stands 160 cm tall, and weighs 53 kg. Her birthday falls on February 3rd, her blood type is O, and her horoscope is Aquarius. She hails from Saitama. Physically, she possesses dark brown hair and brown eyes, with body measurements of 83-57-85 cm. She is right-handed.

Her personality is easygoing, honest, and kind, particularly towards the agency's idols. Despite a perpetually drowsy demeanor, she demonstrates diligence in her work. This contrasts with the serious attitude of the agency's president, Tsutomu Amai, serving as his foil. She excels at multitasking, assisting with voice lessons, dance training, makeup sessions, and administrative duties.

Her hobbies involve collecting sleep-related goods, especially eye masks and neck pillows. She possesses the skill of short sleep, requiring minimal rest to function effectively. Additional skills include budget cooking, penmanship, customer service, calculator operation, traffic control, and other competencies gained through part-time work.

She has a younger sister named Nichika Nanakusa.