Kogoro Mouri operates the Mouri Detective Agency in Beika Town. He attended Teitan High School with his future wife Eri Kisaki, Yukiko Fujimine, and actress Ruri Ujo, later graduating from Beika University as the judo team ace despite battling stage fright. After university, he joined the Tokyo Metropolitan Police Department's Division One alongside Inspector Megure. Recognized as an excellent marksman effective at apprehending criminals, he was not considered a particularly skilled investigator during his police tenure. His reasons for leaving the force remain unconfirmed in the manga, though Movie 2 suggests it followed an incident where he grazed Eri's leg with a bullet to save her during a hostage situation. Around that time, Eri moved out, though they never formally divorced despite a decade-long separation. Their daughter, Ran Mouri, actively encourages their reconciliation. Kogoro maintains feelings for Eri, having once asked her to return, but she declined partly due to his flirtatious behavior toward other women. Their strained relationship recurs, with moments like Kogoro buying Eri an expensive birthday necklace in the Bourbon Arc underscoring his lingering care—though a mix-up led to him accidentally giving her a Buddhist rosary meant for another. Kogoro's detective career initially flounders due to laziness and unprofessional habits; he often idles in his office unless clients are attractive women, and early investigations involve jumping to obvious conclusions or missing key clues. This shifts after Conan Edogawa—the shrunken Shinichi Kudo—moves in. Conan uses a stun-gun wristwatch to sedate Kogoro at crime scenes, then employs a voice-changing bowtie to present deductions through Kogoro's voice while the detective appears asleep. Dubbed "Sleeping Kogoro," he gains renown as a brilliant investigator, solving over 400 cases this way. Kogoro rarely questions these unconscious episodes, instead boasting of his perceived deductive prowess. His awake investigations often embarrass the police, who prefer "Sleeping Kogoro." However, he demonstrates genuine competence in cases with personal stakes, like threats to Ran or Eri. His demeanor then shifts to serious and professional, revealing improved logical reasoning and a better grasp of interpersonal dynamics than Conan. Examples include solving a hot-spring murder involving an old friend unaided, and independently exposing a culprit in Movie 9 (Strategy Above the Depths) because the suspect resembled Eri. Personality-wise, Kogoro exhibits an inflated ego about his detective skills and enjoys celebrity status. Easily infatuated with beautiful women—especially pop idol Yoko Okino, whose merchandise clutters his office and bedroom—this behavior embarrasses Ran and hinders reconciliation with Eri. A heavy smoker and frequent drinker, he litters his office with beer cans. Hobbies include gambling on horse races, playing mahjong (often losing), and neighborhood baseball games. Despite these flaws, he holds a strong moral compass, rejecting murder justifications and intervening to stop suicides or crimes. He cares deeply for Ran, seen in protective actions, and occasionally shows unexpected kindness, like inquiring about rescued animals. Medically, he has high uric acid and cholesterol. While early manga omitted it, he later develops mild acrophobia (fear of heights) in both anime fillers and manga canon. In non-canon material like the OVA "Fatuous Detective!? Kogoro Mouri," he tries appearing intelligent by using technology to preview a drama's solution, only to be exposed by Conan. Physically, Kogoro is tall and reasonably fit with high cheekbones, a short mustache, and slicked-back black hair featuring two loose forehead locks. He typically wears suits during cases. His abilities include judo expertise from university and firearms proficiency from police work. While generally reliant on Conan for deductions, he follows proper police procedures and connects clues effectively when motivated, especially in personal cases. His name is sometimes mistaken for astronauts like Mamoru Mohri in Japan or Patrick Moore in English dubs due to frequent media appearances. The character's name derives from detective Kogoro Akechi (by Edogawa Rampo) and author Maurice Leblanc.