Lu Amano is a police officer with the Miami City Police Department and the daughter of the department's Chief. She initially served as a bodyguard assigned to protect Yao Sakurakouji from Leon Morimoto. Following that case's resolution, Yao joined the police force, becoming Lu's partner. Lu is frequently responsible for reining in Yao's reckless behavior.

Her personality is consistently calm and composed, especially compared to her partner's impulsiveness. She operates with deadpan observation and dry wit, maintaining a calculated attitude. Lu has a personal interest in wealth management and finances. She lends money to Yao at high interest rates whenever Yao faces financial hardship due to her father cutting off funds. Despite her outwardly detached and sometimes comically opportunistic financial dealings, Lu harbors genuine concern for Yao's well-being, though she rarely voices this worry openly.

Lu exhibits a strong sense of responsibility and authority in her police work, often taking strategic command. She possesses sharp awareness of her surroundings and the consequences of actions, making her the partnership's more level-headed member. Her background as the police chief's daughter and her prior role as a bodyguard contribute to her professional competence and authoritative presence.