Kogoro Mouri is a 38-year-old private detective operating the Mouri Detective Agency in Beika Town and the father of Ran Mouri. He remains legally married but separated for roughly ten years from his wife, lawyer Eri Kisaki; Ran persistently attempts to reconcile them. Kogoro attended Teitan High School and Beika University, excelling in judo yet struggling with stage fright. He previously served as a police officer in the Tokyo Metropolitan Police Division One under Inspector Megure, recognized for his marksmanship but not his investigative skills. While the exact reasons for leaving the force remain unconfirmed, an incident involving Eri during a hostage situation may have played a role. Kogoro's reputation as a detective primarily stems from Conan Edogawa, who solves cases by sedating him and using a voice-changing device to imitate him, earning Kogoro the nickname "Sleeping Kogoro." He typically overlooks inconsistencies in these solved cases and boasts about his perceived successes. When awake at crime scenes, he often makes unprofessional comments or fixates on obvious clues, leading to incorrect conclusions that embarrass the police. However, he demonstrates genuine deductive ability and professionalism in cases involving personal connections, such as those implicating Ran or Eri, showing improved logical reasoning and insight into interpersonal relationships; he has solved several cases independently under such circumstances. Personality-wise, Kogoro displays arrogance, laziness, and flirtatious behavior, especially toward attractive women like idol Yoko Okino, whom he avidly follows. He enjoys gambling, horse racing, mahjong, and baseball. He is a heavy smoker and frequent alcohol consumer, his office often littered with empty beer cans, and suffers from high uric acid and cholesterol. Despite these flaws, he possesses a strong sense of justice, opposes killing, and prioritizes human life, intervening to prevent suicides or murders. He is deeply protective of Ran. This protectiveness extends to others, as evidenced when he sustained critical injuries after pushing Ai Haibara out of the path of an oncoming truck following a bombing near police headquarters, an act of self-sacrifice performed while saving her from the blast's shockwave. In *The Bride of Halloween*, Kogoro participates in a police drill simulating the wedding of colleagues Sato and Takagi and later attends a security committee meeting at police headquarters. After the meeting, while escorting the Detective Boys to a restaurant, he witnesses a foreign man drop a bloodstained tablet. When the tablet explodes, injuring Haibara and throwing her into the street, Kogoro rescues her but is struck by a truck, rendering him unconscious and hospitalized in critical condition. This incident reinforces his tendency to act heroically when those close to him are endangered.