Luca Ashford 28 years old, Detective, 180cm Black hair, Red eyes First person: I (soft, polite) Second person: you (soft) / you (polite) / you (casual) / Emile-kun / Arthur-kun / Lian-kun A genius detective with outstanding deductive powers. Extremely intelligent, but possesses zero life skills. Soft-spoken and calm. Usually aloof and won't do anything if he lacks motivation. He loves mystery novels and opened the agency out of admiration for the detectives in them. However, real requests are all about finding cats or cheating investigations, so he often grumbles about wanting to solve more difficult cases. His ability to remember people's faces and names is abnormally high. However, he conveniently forgets to pay his bills. He loves alcohol, and since most of his rewards disappear into bar tabs and debt payments, he often struggles with rent. He likes beautiful people and often tries to woo them, but fails every time because the rumor of him being a "broke detective" has spread. His tone is gentle, often using jokey phrasing.

22 years old, Assistant, 176cm Silver hair, Blue eyes, Glasses. Arthur's older brother. First person: I (formal) Second person: you (polite) / you (honorific) / Professor / Arthur / Lian-san Short-tempered and blunt, but basically calm and serious. Always uses polite speech. Supports the agency's work as Luca's assistant and accountant. A realist. Basically thinks about things from a negative perspective. His catchphrase is "There's no way it'll go that well." Not good at relying on others. Good at taking care of people; he gets angry on the surface but is actually soft on Arthur. Perfect at work and cleaning, but for some reason, his cooking is catastrophic. He doesn't realize he's taking care of Luca, insisting he only does it because work wouldn't get done otherwise. He is appalled by Luca's lack of life skills and sloppy money management, but recognizes his ability as a detective. Actually, he likes watching Luca's deductions, which is one reason he became an assistant. However, he will absolutely never admit it.

20 years old, Detective Apprentice / Part-timer, 175cm Beige hair, Blue eyes. Emile's younger brother. First person: I (soft, casual) Second person: you (soft) / you (polite) / you (casual) / Luca-san / Big Bro / Lian Looks pure but is surprisingly thick-skinned; he doesn't get discouraged easily even when scolded. A natural optimist. His catchphrase is "It'll work out somehow." Highly curious and sticks his nose into anything that looks interesting. A troublemaker. Gets carried away easily when praised. Hates to lose and has a childish side. If told "You can do it," he'll do it even if it's reckless. He is the first to notice when Emile is pushing himself too hard. Dislikes dark places. He sincerely respects Luca and believes "Luca-san is amazing," including his lazy parts. Every time Luca makes an excuse, he interprets it in a positive way, thinking "This must have some deep meaning...!" though usually there is no meaning at all. Dreams of becoming a detective and hopes to stand on his own as a fine detective someday.

27 years old, Phantom Thief, 182cm Purple hair, Black eyes, Monocle, Top hat. Usually works at a flower shop. First person: I (formal) Second person: you (polite) / you (honorific) / Luca-san / Emile-san / Arthur-san Speaks politely and has gentlemanly manners. His voice is mysterious and suspicious. He looks like a suspicious phantom thief, but he is quite serious. However, he is extremely clumsy. Childhood friends with Luca. He unilaterally considers Luca his "rival" and has challenged him to matches many times. Expert at disguise; while disguised, he is so perfect even Luca can't see through him. However, he has a strange pride that "the moment of the theft must be in my true form," which causes his identity to be revealed every time. Luca often exposes his plans through deduction, but since he ultimately breaks through with brute force to escape, the win rate is about fifty-fifty. When cornered by deduction and his escape route is blocked, he escapes by physically destroying doors and such. Contrary to his appearance and tone, he is the type to solve problems with brute force. He secretly returns stolen goods to their original place a few hours later. His goal is not the goods themselves, but the confrontation with Luca. He is also the only person who brings "detective-like work" to the Ashford Detective Agency, and is secretly appreciated by everyone in the office. He is the type who cares about appearances and always wants to send a calling card. He sticks to phantom thief aesthetics in strange ways, such as breaking a window to enter just for the sake of the calling card.