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· Eisuke Hondou, a transfer student who appeared in episode 429, initially seemed like a clumsy and unstable high school student.
· However, it was revealed that he is the younger brother of Hidemi Hondou and has deep ties to the Black Organization. Conan himself was wary of Eisuke.
· Eisuke decided to go to America to become a CIA agent like his sister, but his subsequent whereabouts are largely unknown, making his current location uncertain.

· Tomoaki Araide appeared as a disguise used by Vermouth. While he initially helped Conan, it was later revealed he was Vermouth in disguise.
· The FBI, sensing the Black Organization was targeting Araide, faked a car accident to help him escape to America, where he was then placed under FBI protection.
· He has since returned to his original identity and resumed his position as a teacher at Teitan High School. However, after Vermouth's escape, he rarely appeared, making him a somewhat forgotten character.

· Ayako Suzuki, the eldest daughter of the Suzuki conglomerate and Sonoko's older sister, appeared a few times early in the series.
· However, her appearances were so infrequent that those who started watching Conan later might not even know she exists.
· With a calm personality and not one to stand out, she's easily forgotten. She's rarely mentioned now, making her feel like a 'character from back then.'

· Mr. Tome, belonging to the forensics department, was a forensic scientist who frequently appeared at crime scenes in the early anime.
· His real name and age are unknown, but he was responsible for examining evidence and explaining the situation at crime scenes, contributing to the series' atmosphere.
· Since the death of his voice actor, Toshiko Nakajima, he has not appeared, leaving a sense of regret for those who remember early Conan.

· Kiyonaga Matsumoto appeared as the superintendent overseeing the First Investigation Division of the Metropolitan Police Department, a higher position than Inspector Megure.
· He was initially a detective but was promoted to the Metropolitan Police Department through a personnel change. He had a connection with Conan's group as his daughter, Sayuri, was Shinichi and Ran's middle school homeroom teacher.
· Since the death of his voice actor, Seizo Kato, he has not appeared, only making silent cameos in movies. Kuroda Hyoe has since taken over the superintendent position, diminishing his presence.

· Shintaro Chaki is a detective from the Metropolitan Police Department's Second Investigation Division, Intelligence Crimes Unit, and the head of Kaitou Kid countermeasures.
· He was dispatched by the Superintendent General when Kaitou Kid sent a threat letter. Unlike Inspector Nakamori, who pursues Kid at the scene, Chaki primarily worked from the investigation headquarters, decoding ciphers and issuing orders.
· He is acquainted with Sumiko Kobayashi and has a comical side, sometimes believing Kogoro Mori's outlandish deductions due to his own weaknesses in deduction. He rarely appears outside of Kid-related cases, making him a character fading from memory.

· Reiko Kujo, an elite prosecutor known as the "Madonna" of the prosecutor's office, appeared as Eri Kisaki's rival.
· She achieved victory after victory with her sharp intellect and courtroom skills, adding tension to the legal battles with Eri Kisaki.
· She was used as a witness to the defendant's suicide and intended to resign, but she collaborated with Eri Kisaki to uncover the truth and catch the culprit.
· Recently, with Sumiko Kobayashi, Conan's homeroom teacher, participating as a juror, the focus shifted to Ms. Kobayashi. After the final courtroom showdown, she hasn't appeared, leaving a sense of longing.

· Toshiro Odagiri is a character who appears only in the movies and was Kogoro Mori's former superior when Mori was a detective in the First Investigation Division.
· He is a capable police officer with the conviction that uncovering the truth is the police's role.
· In the story, his son Toshiro became a suspect, and allegations of his involvement in a serial murder case put him in a difficult position.
· Although initially stern with Conan, he eventually acknowledged and respected Conan for uncovering the truth of the case faster than anyone else. He continues to appear in movies, making him a memorable character, albeit one seen only in films.

· Naoki Uemura was a character who appeared in a case involving the blackmail of a professional soccer player and was a player for the professional soccer team Tokyo Spirits.
· He was known as the "Golden Combo" with his rival team's player, Shu Akagi, but he orchestrated the kidnapping of Shu's younger brother.
· In reality, he had no intention of harming the brother and planned to disappear after the job was done, but his plan failed due to Ran's anger.
· After the incident, he returned from injury and played actively. He was not arrested because Conan solved the case using only Shinichi's voice. He later appeared in the 16th movie, "The Eleventh Striker," showing a rare case of a former criminal reintegrating into society.

· Tsutomu Akai is Mary Sera's husband and Shuichi Akai's father, affiliated with MI6, the British secret intelligence service.
· He is deeply involved in the Kohji Haneda murder case and has been missing for 17 years, with his life or death unknown.
· As he was friends with Kohji Haneda's father, he was asked to investigate the case of Kohji Haneda, who died in America. During this investigation, he discovered the Black Organization's involvement and sent his family into hiding in Japan.
· He subsequently disappeared himself, and his existence became the catalyst for Shuichi Akai becoming an FBI agent. His whereabouts remain a mystery, and he is expected to play a significant role in future developments.