Mouri Ran

Ran is a childhood friend of Shinichi Kudo. She is the daughter of Kogoro Mouri, a private detective, and Eri Kisaki, a lawyer. Her parents separated when she was seven,[4] and one of her biggest goals is to get them back together. Her best friend besides Shinichi is her classmate Sonoko Suzuki, who often teases her about her relationship with Shinichi. Her other friends include Masumi Sera, Kazuha Toyama and Heiji Hattori.

Ran first met Shinichi back in Sakura class. Ran began liking Shinichi when she noticed he was wearing a paper name badge like her, so she wouldn't be bullied for being the only one without a proper badge. Unknown to her, her home room teacher was secretly planning to kidnap her, which Shinichi - with his father's help - foiled. Ran seemed unaware of the plot.

When Ran and Shinichi were six, they snuck into Teitan elementary school at night to uncover the truth behind a hat-wearing monster rumor. They met the elder Kaitou Kid in the school library who played a nasty prank on them before handing over a code inside a leather wallet. With the help of Agasa, Shinichi and Ran partially solved the case and Shinichi started to informally call Ran by her first name. That same year Ran met Fusae Campbell who was waiting to see if Agasa would appear at their promised meeting place. Fusae gives Ran her umbrella and asks Ran to buy one of her designer purses when she gets older.

Before a year before the series' start, Ran and Shinichi visited Shinichi's parents in New York which they took advantage of, since Kogorō was on a community trip. She was there when Shinichi solved his first case and gained recognition as a detective. They met Yukiko Kudo, his mother, and her actress friend, Sharon Vineyard (the public face of Vermouth, a member of the Black Organization). Later that evening, she encountered Shuichi Akai who warned her there was a serial killer on the prowl in the area. Ran later encountered Vermouth in disguise as the serial killer. Vermouth would have fallen to her death, but Ran caught her arm and Shinichi helped her pull Vermouth to safety. Due to this, Vermouth gave Ran and Shinichi the nicknames "Angel" and "Cool Guy", respectively.[5] Vermouth later showed hesitance to kill Ran and later Conan Edogawa (Shinichi's childhood form) as well,[6] but whether or not it was because of any emotional attachment is unclear. It was during this trip that Ran realized her true feelings for Shinichi, finally realizing that she is in love with him.

Before the tropical land meetup, Shinichi and Ran visited Beika Aquarium together where Shinchi solved a case. After the case Shinichi accidentally making her drop her new cellphone on a sewer, he promises to replace it and take her to Tropical Land if she wins the Karate Championship as an apology, she also half-jokingly demands her new cellphone to be strapped with a sea cucumber strap, which Shinichi actually got for her.

After Shinichi's disappearance while on a trip to Tropical Land Amusement Park with her, Ran met Conan, who was introduced by Professor Agasa as a "distant relative". At Agasa's request, Ran agreed to look after him, and immediately came to think of him as a surrogate little brother.[7] Ran has come to suspect Conan's identity multiple times, but Conan always manages (helped by his friends like Ai Haibaraand even Kaito Kid) to find a sufficient alibi to satisfy her concerns.