Kogoro Mouri operates the Mouri Detective Agency in Beika Town. A former police officer in the Tokyo Metropolitan Police Department's Division One under Inspector Megure, he was known for his marksmanship rather than exceptional investigative skills. His departure from the force remains unconfirmed in the manga, though supplemental media suggests a hostage incident involving his wife, Eri Kisaki, played a role. He attended Teitan High School with Eri Kisaki, Yukiko Fujimine, and Ruri Ujo. Kogoro later graduated from Beika University as the ace of its judo team, despite struggling with stage fright. He married Eri Kisaki, and they have a daughter, Ran Mouri. Approximately ten years ago, they separated due to marital disputes, primarily Kogoro's flirtatious behavior and unprofessional habits. They remain legally married but live apart, with Ran attempting reconciliation. Kogoro retains feelings for Eri and has asked her to return, but she declined due to unresolved issues. His attraction to pop idol Yoko Okino, whom he avidly follows and collects memorabilia of, further strains the relationship. After Shinichi Kudo was transformed into Conan Edogawa, Kogoro took him in at Ran's insistence. Conan secretly assists Kogoro's detective work by tranquilizing him with a stun-gun wristwatch and using a voice-changing device to present deductions through him. This established Kogoro's reputation as "Sleeping Kogoro," referencing his unconscious state during solved cases. Kogoro rarely questions these incidents or memory inconsistencies, instead boasting about his perceived successes. Police officials like Inspector Megure view his awake persona as incompetent and eagerly anticipate his "sleeping" deductions. Kogoro exhibits laziness, egotism, and unprofessionalism. He often neglects investigations unless clients are attractive women, spends excessive time drinking, smoking, and gambling on horse races and mahjong, leaving his office cluttered with empty beer cans. However, he possesses a strong sense of justice and empathy, actively preventing criminals from suicide and defending innocents like Genta Kojima from false accusations, prioritizing human life. When cases involve loved ones—particularly Ran or Eri—his demeanor shifts dramatically. He becomes focused, bypasses Conan's assistance, and demonstrates competent deductive skills, leveraging his understanding of interpersonal relationships, such as independently solving a case in the ninth film when the culprit resembled Eri. His abilities include proficient judo and marksmanship. While typically reliant on Conan for clue gathering, he excels at logically connecting evidence in high-stakes scenarios. He also exhibits mild acrophobia, initially depicted in films and later incorporated into manga canon. Kogoro is occasionally mistaken for figures like astronaut Mamoru Mohri due to media exposure. In crises threatening loved ones, such as when Ran and the Junior Detective League were held hostage, Kogoro collaborates directly with allies like Heiji Hattori and Kaito Kid to resolve the situation. His public detective image is further explored in media like OVA 5, where the Junior Detective League shadows him, revealing both mundane and perilous aspects of his work.