Ayumi Yoshida, a first-grade student at Teitan Elementary School, co-founded the Detective Boys by initiating an investigation into a haunted mansion. This led to solving a homicide case and forming the group with Conan Edogawa, Mitsuhiko Tsuburaya, and Genta Kojima. She served as the sole female member until Ai Haibara joined. Ayumi developed intense feelings for Conan after he saved the group from mafia members during a treasure hunt for stolen Italian gold coins. She frequently expresses her affection through cheek kisses and open discussions about marrying him, sparking jealousy in Mitsuhiko and Genta, who both admire her. Initially formal with Haibara as "Haibara-san," Ayumi earned permission to use "Ai-chan" through persistent kindness, strengthening their friendship. She displays a cheerful, adventurous spirit with growing courage and observational skills, often spotting subtle investigative details like appearance discrepancies or environmental clues. For instance, she solved a Momotaro container code by linking it to art museum statues. Ayumi refers to herself by her given name and uses neutral speech, though early anime depicted more energetic assertiveness. She lives with her parents in a high-rise apartment; only her father appears visually in the series. Ayumi shows affection through physical gestures like holding her mother’s hand. Her abilities include artistic drawing talent and a natural rapport with animals. Within the Detective Boys, she mediates conflicts, provides emotional support, and acts protectively in danger. Key cases involve her kidnapping during hide-and-seek where she overheard criminals (later revealed as actors), the bank robber hospitalization incident, and multiple bomb investigations. In *Detective Conan: The Bride of Halloween*, Ayumi scouts wedding locations during Shibuya’s Halloween festival with the Detective Boys. Directed to retrieve an item, they enter a building rigged with explosives identical to one encountered by Rei Furuya, narrowly escaping the blast. Ayumi contributes as part of the ensemble, collaborating to prevent a city-wide explosion using an inflatable barrier. Across media, Ayumi maintains core traits: optimism, budding deductive skills, and unwavering loyalty. Her development emphasizes strengthening Detective Boys bonds while navigating unrequited childhood romance.