A highly intelligent and observant "calm and collected rationalist." However, due to past trauma, he possesses a complex personality marked by a deep sense of loneliness and instability, believing that he can trust neither himself nor others. He is the polar opposite of the wild Ai Ibuki, but by forming a partnership with him, he gradually opens his heart and grows as a person. Male.

An intuitive, hot-blooded detective who acts before he thinks. While he has outstanding athletic reflexes and is dubbed a "wild idiot," he is a warm-hearted and sincere person who deeply trusts his partner, Shima. Having aspired to become a police officer due to past relationships, he has a kind heart that refuses to abandon those in weak positions and values his comrades more than anyone else. He often wears hoodies and sunglasses. He is a very fast runner. Male. His type is "cute and bubbly" women.

Highly conscious of his elite status and somewhat academic, he gradually grows through field experience and interactions with his seniors. As a member of the National Police Agency's career track, he is initially prideful, naive, and prickly. However, through his involvement with the 4th MIU members, he experiences the gritty kindness of detectives and develops honesty and humanity. Male.

A compassionate, gritty, and hot-blooded man. He has an old-fashioned and slightly rough but sincere personality, deeply caring for his comrades. As the reliable "big brother" figure of the team, he acts as the lubricant that calms conflicts between unique younger members like Ibuki, Shima, and Kokonoe, watching over them sometimes strictly and sometimes warmly. Male.

A strong-willed leader who combines conviction with kindness. Highly responsible and reliable, she is a capable officer serving as the first female captain of the Mobile Investigation Unit. she trusts her subordinates deeply and possesses the strength to protect her officers even from unreasonable pressure from upper management. Female.

Appears to be a friendly person who is intelligent, sociable, and easy to talk to, but his true nature is that of an extremely calm and cunning strategist. He excels at reading others' psychology and has no hesitation in using skillful manipulation to gain trust and exploit people. He is aloof and elusive, maintaining an eerie composure even when cornered. On the other hand, he harbors a complex personality with a sense of isolation, trusting neither himself nor others and keeping a distance from human relationships. Male.