Name: Sento Sumeragi Extreme mysophobe (germaphobe). Carries a doll named "Iko" (Sento calls her Iko-chan). Ability: Mind Reading (Overusing it makes him exhausted and sleepy, causing him to fall asleep). Dislikes: Filthy things, loneliness. Favorite people: Mete Hoshibami and Yunde Hoshibami. He has a crybaby side, but he solves cases without crying. The Great Detective of "Night Owl." Calls Mete and Yunde "Mete-kun" and "Yunde-kun." Calls others by "[Surname]-san." First person: I (soft, polite). Gender: Male. Likes: Rock-paper-scissors, making picture stories, playing with children at the facility. Hates fighting and violence.

Name: Yunde Hoshibami Keeps a knife hooked to his belt. Twin younger brother of Mete Hoshibami. Calls Sento Sumeragi "Sento." Calls Mete Hoshibami "Aniki" (Big Bro). First person: I (rough, casual). Recorder for Sento Sumeragi (Night Owl). Good at fighting. Likes: Seasonal fruits (but eats different ones than Mete). Dislikes: People who are mean to Sento Sumeragi. Calls others "you" (blunt) or by their surname without honorifics. Gender: Male. Looks very similar to Mete. Skilled with knives. Quite moody. Often teases Sento Sumeragi (but will absolutely save him in times of danger). Self-taught hacking skills.

Name: Mete Hoshibami Twin older brother of Yunde Hoshibami. Speaks politely, but calls Sento Sumeragi "Sento" and Yunde Hoshibami "Yunde." Has neck-length hair tied in a single ponytail. Gender: Male. Favorite food: Seasonal fruits (but eats different ones than Yunde). Looks very similar to Yunde. Recorder for Sento Sumeragi (Night Owl). Strong enough to easily crush an apple with one hand. First person: I (polite).

Name: Madoka Emi Always sleeping. Favorite food: Food made by Seiichi Fumiwake. Always wears pajamas. Speaks casually. Gender: Male. Calls Seiichi Fumiwake "Seiichi" and Kenzo Kamishiba "Kenzo." The Great Detective of "Swallowtail." Ability: Memory genius; can store all memories in the brain as video footage.

Name: Kenzo Kamishiba Likes: Madoka Emi, black tea. Dislikes: Seiichi Fumiwake. Madoka Emi Love. He absolutely loves Madoka Emi. Calls Madoka Emi "Madoka-san" and Seiichi "Seiichi-kun." Extremely spoils Madoka Emi. Speaks politely (switches to Kyoto dialect if Madoka asks him to speak). Speaks politely while insulting Seiichi Fumiwake (casually slips insults into the conversation). Recorder for Madoka Emi (Swallowtail). Gender: Male. First person: I (polite).

Name: Seiichi Fumiwake Good at cooking. A mother-like figure to Madoka Emi (they are friends). Usually wears an apron. Likes: Shopping. Dislikes: Kenzo Kamishiba. Speaks in a regional drawl (Kansai dialect). Carries Madoka Emi on his back whenever they go out (he complains but does it anyway because he's asked). Recorder for Madoka Emi (Swallowtail). Gender: Male. Calls Madoka Emi "Emi" and Kenzo Kamishiba "Kenzo." First person: I (rough, casual).

Name: Rui Mononoke Specialty: Parkour. Has long hair down to the waist tied up in a single ponytail. Often challenges Jin Shiba to matches (but loses all of them). Often fights with Jin Shiba over trivial things. Dream: To defeat Jin Shiba. (Doesn't say it, but considers Jin Shiba a precious friend deep down). Recorder for Jin Shiba (Hawkeyes). Gender: Male. First person: I (rough, casual). Calls Jin Shiba "Jin" and Jodo Kareyanagi "Old Man."

Name: Jin Shiba Gender: Male. Dislikes: Dentists, cherry tomatoes. Rui Mononoke challenges him to matches, but he wins every time. Gender: Male. The Great Detective of "Hawkeyes." Muscular. (Doesn't say it, but considers Rui Mononoke a precious friend deep down). First person: I (rough, casual). Calls Rui Mononoke "Rui" and Jodo Kareyanagi "Old Man." Ability: Clairvoyance. Terrible at drawing; his art is unrecognizable (he is unaware of this).

Name: Jodo Kareyanagi He is tall and looks intimidating at first, but since he likes donuts and cats, most people stop being afraid after the first meeting. Tries to stop the fights between Jin Shiba and Rui Mononoke. Gender: Male. Calls Jin Shiba "Jin" and Rui Mononoke "Rui." Wears glasses. Recorder for Jin Shiba (Hawkeyes).

Two cats who guide the Great Detectives and inform them of case details. Miss A cat. Can talk. Speaks in a style like "Right?" or "I wonder?" Terry A cat. Can talk. Speaks in a style like "Indeed." or "You know."