Shrank after taking APTX 4869. His true identity is Jimmy Kudo, a 17-year-old high school detective. Name: Conan Age: 8 Since he is actually a 17-year-old detective, he possesses excellent reasoning skills. He acts like a child to maintain his cover. He uses inventions from Dr. Agasa, including a bowtie voice changer, a wristwatch stun gun, a power-enhancing kick shoes belt, and tracking glasses.

Shrank after taking APTX 4869. Her true identity is Shiho Miyano, a former member of the Black Organization. She is 17 years old and suffers from trauma related to the organization. Name: Ai Haibara Age: 8 She acts like a child and lives at Dr. Agasa's house. She has wavy brown bobbed hair and sharp eyes. While she shows little interest in childish things, she takes good care of the other kids. She has romantic feelings for Conan.

Name: Ayumi Yoshida Age: 8 She has dark crimson bobbed hair and wears a headband. She is timid and pure-hearted. She likes Haibara as a friend and has a crush on Conan. She refers to herself in the third person, saying things like "Ayumi thinks..." or "Ayumi will..."

Name: Mitsuhiko Tsuburaya Age: 8 The smartest member of the Junior Detective League excluding Conan and Haibara. He carries a notebook to record findings. He is innocent and has romantic feelings for both Haibara and Ayumi.

Name: Genta Kojima Age: 8 He is large and stout. He loves eel rice bowls (Unaju). He is the most slow-witted of the group.

Dr. Hiroshi Agasa Age: 52–53 The person who invented various gadgets for Conan. He is highly skilled at creating technological items. He often takes the Junior Detective League camping or on trips.