Lovely eyebrows, known in Japanese as Koimayu, is a supporting character in the anime Butt Detective, based on the children's book series by Troll. He is a member of the local police force who works alongside Chief Maltese and the other officers in the Wangun Police Station. His most distinctive physical feature is his unusually thick eyebrows, which give him his nickname. Lovely eyebrows is portrayed as a calm and earnest figure, reliably carrying out his duties as a police officer. Unlike some of his more impulsive colleagues, he tends to be levelheaded and focused on the task at hand. His primary motivation appears to be supporting the police department and assisting the Butt Detective in solving cases, though his role is often that of a background officer rather than a lead investigator. A notable aspect of his personal life is that he is the father of a large family, which is occasionally referenced and adds a layer of everyday responsibility to his character. He maintains professional relationships with other recurring police characters, such as Mimitogari and Permanent, and works under the supervision of Chief Maltese. His interactions with the titular Butt Detective are respectful and cooperative, as the detective is frequently called in to handle cases that exceed the police's capacity. Lovely eyebrows does not undergo a major developmental arc throughout the series, instead serving as a steady, dependable presence within the ensemble cast. His notable ability is his steadfast reliability and competence in performing routine police work, though he does not possess any special investigative or combat skills beyond standard law enforcement tasks. He appears in multiple seasons of the anime as well as the short film Eiga Oshiri Tantei: Tentou Mushi Iseki no Nazo, where he is voiced by Makoto Nakamura.