Fumi Kindaichi is the cousin of Hajime Kindaichi, the franchise's protagonist. She belongs to the Kindaichi family, which counts the renowned fictional detective Kosuke Kindaichi, Hajime's grandfather, among its members.

Her appearances occur intermittently throughout the manga series. She is listed as a character in the manga arcs "Short File Series," "Case Series," "Shin Series," "Returns," "Gaiden: Hannin-tachi no Jikenbo," and "Kindaichi 37-sai no Jikenbo." The provided materials do not elaborate on specific details of her background story, character development, or direct involvement in cases, including "The 'Jikenbo' of Young Kindaichi: Murder in the Deep Blue."

One source infers her personality as ENTP (8w7), though this is not elaborated with specific behavioral examples or canonical traits. The provided information does not include details regarding her role, relationships, or narrative significance across official media such as seasons, movies, OVAs, or spin-offs.