Kogorō Mōri runs the Mouri Detective Agency in Beika Town. He attended Teitan High School with his future wife, Eri Kisaki, and later Beika University, where he became the ace of the judo team despite suffering from stage fright. After graduation, he joined Tokyo Metropolitan Police Division One under Inspector Megure. While recognized as an excellent marksman and effective at apprehending criminals, he was not considered a particularly skilled investigator during his police service. His marriage to Eri produced their daughter, Ran Mōri, but the couple separated roughly ten years before the main events due to frequent arguments, primarily caused by Kogorō's flirtations with attractive women and his heavy drinking and gambling habits. They never formally divorced, and Kogorō retains deep feelings for Eri, occasionally attempting reconciliations like buying expensive birthday gifts, though his carelessness often undermines these efforts. He currently lives with Ran and Conan Edogawa, a child placed under his care. Kogorō exhibits laziness, an overinflated sense of his detective abilities, and unprofessional conduct during investigations, frequently making sarcastic comments or jumping to incorrect conclusions based on superficial evidence. He spends significant time lazing in his office, drinking beer, smoking heavily, gambling on horse races, playing mahjong, or watching baseball. He is easily infatuated with beautiful women, especially pop idol Yōko Okino, whose merchandise fills his office and bedroom. However, cases involving his family or people he deeply cares about trigger a significant transformation; he becomes serious, professional, and demonstrates markedly improved deductive skills and insight into interpersonal relationships, sometimes solving complex cases independently without Conan's assistance. He firmly rejects any justification for murder. Kogorō's detective reputation changed dramatically after Conan Edogawa began living with him. To maintain his cover while investigating the Black Organization, Conan uses a stun-gun wristwatch to incapacitate Kogorō at crime scenes. While Kogorō is unconscious, Conan employs a voice-changing bowtie to imitate his voice and present the correct deductions. This method earned Kogorō the nickname "Sleeping Kogorō" (Nemuri no Kogorō) and a public image as a brilliant, albeit unorthodox, detective. Kogorō rarely questions the consistent blackouts and instead boasts about his newfound success. His fame grew significantly from these solved cases, attracting more clients. Despite his usual incompetence, he has solved a handful of cases on his own merit, particularly when emotionally invested in matters involving Eri or old acquaintances, revealing latent investigative ability when properly motivated. In the movie "Detective Conan: The Bride of Halloween," Kogorō demonstrates his protective instincts during an incident near Tokyo Metropolitan Police Department headquarters. While walking with Ran, Conan, and the Detective Boys, a foreign man carrying a bloodstained tablet dropped a piece of paper. Ai Haibara retrieved it and tried to return it. Suddenly, the tablet exploded, throwing Haibara into the path of an oncoming truck on Uchibori Street. Kogorō immediately rushed into the street and pushed Haibara to safety but was struck by the truck himself. This selfless intervention to save Haibara, a child under his informal care, caused severe injuries requiring hospitalization in critical condition. It underscores his underlying sense of responsibility and willingness to risk himself for others, especially children connected to his family circle. This event occurs amidst a larger bombing plot investigated by others, but Kogorō remains hospitalized during much of the subsequent investigation. Kogorō possesses notable physical abilities from his past as a university judo champion and police training as a skilled marksman. He suffers from some middle-aged health issues like high uric acid and high cholesterol. While early anime episodes suggested acrophobia, this trait is not consistently present, especially in the manga. He can drive but typically relies on rental cars or taxis. Financially, while he enjoys money and charges high fees, he adheres to a personal moral code, refusing unethical jobs. His complex relationship with Eri and Ran remains central, with Ran persistently attempting to reunite her parents. Kogorō's character development shows moments where his genuine detective skills and deep care for his family surface.