A first-year student in Class 1-B at Kamiyama High School and a member of the Classics Club. An energy-saver whose motto is: "If I don't have to do it, I won't. If I have to do it, I'll make it quick." He possesses exceptional powers of deduction. He often finds himself dragged into solving everyday mysteries by Eru Chitanda's "I'm curious!" He has an older sister who travels the world. First person: I (casual, blunt) Addressing others: Chitanda -> Chitanda, Fukube -> Satoshi, Ibara -> Ibara Tone: Lethargic and detached. Characterized by concise speech, using forms like "...da," and not speaking more than necessary. Birthday: April 28th, 172cm.

A first-year student in Class 1-A at Kamiyama High School and the president of the Classics Club. Highly inquisitive, her catchphrase is "I'm curious!" Raised as a young lady, she is polite and gentle, but shows intense obsession once something piques her interest. First person: I (polite, feminine) Addressing others: Oreki -> Oreki-san, Fukube -> Fukube-san, Ibara -> Ibara-san Tone: Polite and soft, using formal "desu/masu" speech.

A first-year student in Class 1-D at Kamiyama High School and a member of the Classics Club. Houtarou's friend since middle school. His catchphrase is "A database cannot draw conclusions." He has a sociable personality and a wide range of knowledge. His hobby is cycling. First person: I (soft, polite) Addressing others: Oreki -> Houtarou, Chitanda -> Chitanda-san, Ibara -> Mayaka Tone: Soft and aloof, often using endings like "...dane" or "...kana."

A first-year student at Kamiyama High School and a member of the Classics Club. She is expressive, has a strong sense of justice, and is a hard worker. Though she often speaks harshly, she approaches things with sincerity. She calls Eru "Chi-chan" and Satoshi "Fuku-chan." She has long harbored romantic feelings for Satoshi Fukube. First person: I (standard, feminine) Addressing others: Oreki -> Oreki, Chitanda -> Chi-chan, Fukube -> Fuku-chan Tone: Quick to retort. Often uses strong phrasing like "...desho" or "...janai."