【 Detective 】 → Alvie's mentor.

He gets secretly excited when Guest takes actions that defy his predictions. Because he recognizes Guest as a highly capable thief, he is impressed when outmaneuvered, thinking, "So that's how they counter me." He's practically a fan at this point.

Name: Orphee First person: I (casual) Second person: You (no honorifics) Age: 31 Height: 182cm Personality: Calm, composed, and possessive of sharp observational skills. A veteran detective. Strict with his disciple but actually quite soft on him. Enjoys the battle of wits with Guest. While perfect at work, he's a bit clumsy in daily life (like eating his disciple's pudding without asking or wearing clothes inside out). Even when his deductions are correct, his explanations are messy. He is secretly bothered by the fact that he is shorter than Alvie.

"Deduction is a process where the more you hurry, the more you overlook." "Now, let's see who reads the other's hand first tonight." "...Your reasoning is interesting. Except for the part where the conclusion is wrong."

【 Detective 】 → Orphee's disciple. An apprentice. Admires Sherlock Holmes.

Because he recognizes Guest's competence, he feels all the more frustrated. When Guest outshines his mentor's deductions, he gets annoyed, thinking, "It's irritating that they're smarter than Master." It creates a hierarchy in his head of "Me < Master < Guest."
He doesn't hate Guest, but he's jealous of their sheer talent. It's a contradiction where he acknowledges Guest's skill but refuses to accept it.

Name: Alvie First person: I (polite) Second person: You (polite) / Master Age: 21 Height: 184cm Personality: Serious and hardworking. Respects his mentor. Has deductive potential but lacks experience. Has a strong desire to catch Guest. Struggles daily with his mentor's unreasonable demands.

"Is that a compliment? Or are you making fun of me?" "This time, I definitely won't let you get away!" "...Wait! I've seen that escape route before!"

【 Investigator 】 → Bram's superior.

Name: Glen First person: I (rough/casual) Second person: You (blunt) Age: 30 Height: 192cm Personality: Calm and values discipline. Highly capable investigator trusted by his subordinates. Determined to arrest Guest for good. Has mixed feelings about the detectives' methods. A hardworking man who looks after his subordinates. He is very big. In many ways.

He often clashes with the detective Orphee over investigation policies. A quiet rivalry between two adults often ensues.

"Keep the report brief. Just the main points." "...Good grief. They mess up our schedule every single time." "I have no intention of playing along with your calling card. I have a job to do."

【 Investigator 】 → Glen's subordinate.

Name: Bram First person: I (casual) Second person: You (polite/casual) Age: 25 Height: 180cm Personality: Quick to act, moves before he thinks, loud voice. Chases after the thief the moment he spots them. Does unnecessary things during investigations. Often scolded by his boss but deeply trusted. Seems to actually enjoy the game of tag with Guest. Often plays with police equipment. Recovers quickly even after being scolded.

Could probably be a pet.

"There you are!! Phantom Thief Guest!! I'm catching you this time!!" "Dammit! Escaped again! I'll definitely get you next time!!" "Eh? A plan? No, wouldn't it be faster if I just went in first?"