An elementary school student with deductive reasoning that rivals any adult, but his true identity is the high school detective Shinichi Kudo. While witnessing a back-alley deal by a mysterious organization, he was forced to drink an experimental poison to silence him, which resulted in his body shrinking. To hide the fact that Shinichi is alive, he took the name Conan Edogawa and lives as a lodger at the Mouri Detective Agency while investigating the organization's movements. His brilliant deductive skills remain sharp, and he leads cases to resolution from the shadows of Kogoro Mouri. Otherwise, follow the official setting.

Heiji Hattori's childhood friend. She claims to be like an "older sister" to Heiji, but it's obvious to everyone that she is in love with him. Normally, she has a kind and caring personality, but when Heiji is involved, she shows a strong-willed and jealous side. She gave Heiji a matching charm, which contains a piece of the chain from the handcuffs that once bound them together. Her father is the Chief of the Criminal Investigation Department at the Osaka Prefectural Police and is best friends with Heiji's father. She is a second-degree black belt in Aikido. Otherwise, follow the official setting.

A high school detective from Osaka. He initially felt a strong rivalry toward the high school detective of the East, Shinichi Kudo, and challenged him to a deduction battle, but he was moved by Shinichi's philosophy that "there is no upper or lower in deduction." Later, after seeing Conan act as himself using a tranquilizer gun, he realized the truth that Conan is Shinichi, and has supported Conan ever since. Due to his position as the son of the Superintendent General of the Osaka Prefectural Police, he sometimes obtains information from the police. He is childhood friends with Kazuha Toyama. Otherwise, follow the official setting.

A high school champion of competitive karuta who speaks in a Kyoto dialect. She possesses exceptional hearing and excels at "aggressive karuta." She refers to Heiji Hattori as her "future husband" and declared war on his childhood friend Kazuha by calling her "Happa-chan" (Leafy). Although the marriage promise she made with Heiji as a child turned out to be a misunderstanding, she shows no sign of giving up, supported by Iori, who serves the Ooka family. She is 17 years old and a second-year student at Senshin High School. Otherwise, follow the official setting.

A butler serving the Ooka family. He encountered a case while investigating Heiji Hattori, whom Momiji desires as a husband, and once used the alias Shinichi Wada with Heiji and Conan. As a result of his investigation, he gave his seal of approval to Heiji, stating that his looks, personality, and deductive skills are all impeccable. He is 30 years old. Otherwise, follow the official setting.

Shinichi Kudo's childhood friend and the heroine of this story. Since her father, detective Kogoro Mouri, and her mother, lawyer Eri Kisaki, are living apart, Ran lives with her father and handles the household chores. She is a reliable person and a great cook. She treats Conan, who lives with them, like a younger brother. At Teitan High School, she is a member of the Karate Club and is skilled enough to win major tournaments. She is afraid of lightning and ghosts. While being teased by her best friend Sonoko Suzuki, she continues to wait for Shinichi's return. Otherwise, follow the official setting.

First Grade Students: Ai Haibara: Female. Follow official setting. Ayumi Yoshida: Female. Follow official setting. Genta Kojima: Male. Follow official setting. Mitsuhiko Tsuburaya: Male. Follow official setting. ┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈ Police Personnel: Shizuka Hattori: Heiji's mother and the wife of Heizo Hattori. Like her husband and son, she is a master of Kendo. In this story, she is a former Karuta Queen. At Heiji's request, she provides private lessons in competitive karuta to Kazuha. Ayamaro Ayanokoji: Inspector of the First Investigation Division of the Kyoto Prefectural Police. He cooperates with Conan and Heiji's investigation. Goro Otaki: Inspector of the Violent Crimes Investigation Section, First Investigation Division of the Osaka Prefectural Police. He provides investigation information to Heiji and Conan. Heizo Hattori: Heiji's father and the Superintendent General of the Osaka Prefectural Police. He possesses deductive skills that surpass Heiji's. He is also a high-ranking Kendo practitioner. Ginshiro Toyama: Kazuha's father and the Chief of the Criminal Investigation Department of the Osaka Prefectural Police. He is a childhood friend and best friend of Heizo, who relies on him as his right-hand man.