Prologue: The following is a retelling of the entire Death Note Story That is parallel with the Detective Conan Universe. A crossover of the 2 greatest Detective series out there. This start from the beginning to end of Death Note retold, it will feature Detective Conan but since this is primarily in the death note universe, I will put info in quotes to explain things for first timers to Detective Conan.. Here some background Information on Detective Conan. * Don't think this will be the same as the Death note series with Detective conan characters. Sometimes that may be the case but it will feature new scenes, new characters new to both series, the ending may not even be the same.

Special thanks to wikipedia

Shinichi Kudo

Main article: Shinichi Kudo

Shinichi Kudo (工藤 新一, Kudo Shin'ichi?), known in the English dub as Jimmy Kudo, is the protagonist of the series. Shinichi is a brilliant high school detective who often solves difficult cases for the police. After getting in over his head with a certain case, he is attacked and forced to take an experimental poison by a member of a mysterious secret crime organization that he was investigating. The drug was supposed to kill him, but due to a rare side-effect, he was inadvertently shrunk back to his childhood body. In order to keep his true identity a secret, he now goes under the alias Conan Edogawa (江戸川 コナン, Edogawa Konan?) and pretends to be a real child to throw off suspicion while he secretly solves many cases and looks for clues about the organization. He fears the organization will come back and kill him and everyone he knows if it is discovered that he isn't really dead.

Before he was shrunk, Shinichi was a popular detective, a great soccer player, and was sometimes a bit full of himself before he became "Conan". His two seiyū are Kappei Yamaguchi for Shinichi and Minami Takayama for Conan. He is voiced by Jerry Jewell for Jimmy and Alison Viktorin for Conan. In the TV Drama he was portrayed by Shun Oguri in teenage form Fujisaki Nao in child form. He also has always had a crush on his childhood friend, Ran Mouri (Rachel Moore in the English version), who he is openly in love with, but cannot reveal his feelings to in his current condition.

Ran Mouri

Main article: Ran Mouri

Ran Mouri (毛利 蘭, Mōri Ran?) in the English dub known as Rachel Moore, is Shinichi's best friend since elementary school. Both are in love with one another but neither have the courage to admit their feelings. While in the manga their relationship is not, in the drama movie and in several manga cases (different to the original manga series) they are indeed known as lovers. She is skilled in martial arts and is the captain of her karate team, though her resolve can be easily broken if she has to face anything related with the horror genre. She spends most of her home life looking after Conan (whom she does not know is really Shinichi) and her irresponsible father. She sometimes threatens him with a punch on the table, but is a very genial person. Her seiyū is Wakana Yamazaki and her English voice actress is Colleen Clinkenbeard. In the live drama, she was portrayed by Tomoka Kurokawa.

Richard Moore

Main article: Richard Moore (Case Closed)

Richard Moore known as Kogoro Mori (毛利 小五郎, Mōri Kogorō?) in Japan is Rachel's father, a former police officer turned incompetent private detective. He was married to Eva Kadan, a successful lawyer and childhood friend, but now they are living separately. Despite his irresponsible ways, he appears to care deeply for his daughter, and at times shows some flashes of honor and strict ethics. His seiyū is Akira Kamiya and his English voice actor is R. Bruce Elliot. He was portrayed by Takanori Jinnai in the live drama.

Harley Hartwell known in Japan as Heiji Hattori (服部 平次, Hattori Heiji?) is Jimmy's rival detective from Osaka and his father is the chief of the Osaka police department. He later becomes best friends with Jimmy. He has a relationship with martial artist Kazuha Toyama, his childhood friend and would-be love interest, and this is pretty similar in the case of Jimmy and Rachel. He is also one of the few people who know that Conan is really Jimmy. He persistantly builds friendship with Conan/Jimmy because they share the same goals of becoming greatest detectives and Jimmy is the only person he finds in his age group that can rival his deduction skills. Harley is also a master Kendo fighter. Unlike Jimmy, his favorite author is Ellery Queen rather than Sir Arthur Conan Doyle who wrote Sherlock Holmes. His seiyū is Ryo Horikawa and his English voice actor is Kevin M. Connolly.

Phantom Thief Kid (怪盗キッド, Kaitō Kiddo?) is a male teenager who looks a lot like Jimmy. He also has a best friend named Aoko Nakamori, who looks a lot like Rachel. Despite the fact that Jimmy does not care much about investigating thefts, Kid draws his attention by being an uncatchable magician. Curiously, in the anime, Kaitou discovers Conan's true identity, but keeps his secret, and sometimes Jimmy can even count on Kid's help to solve some of his cases. His codename in the police department is 'International Criminal 1412'. Kaitou Kid appears in his own manga series, Magic Kaito as well. The original Kaitou Kid (8 years prior to the start of the story) focused on mostly stealing antiques and high-valued art. However, he was murdered, and his son takes over for him by continuing in his guise, stealing mostly jewels with strange histories in order to find his father's killers and lure them out. He is a noble thief at heart. His seiyū is Kappei Yamaguchi and his English voice actor is Jerry Jewell.

More here

.org/wiki/List_of_Case_Closed_characters#Friends