Kogorō Akechi leads the Boy Detectives Club he founded and operates the Akechi Investigation Firm. His birth name is Sosuke, but he carries the name "Kogorō Akechi" inherited from his adoptive father figure, the original literary detective created by Edogawa Ranpo.

He is tall and handsome, with shoulder-length brown hair swept into a half-ponytail featuring a large and medium strand at the back and a thin strand hanging loose on his left side. His brown eyes and chin stubble accompany his typical attire: a pink shirt with a burgundy tie, white pants secured by a brown belt, and a concealed bulletproof vest.

Despite cultivating a deceptive facade of laziness and apparent incompetence, Kogorō possesses exceptional mental acuity and physical prowess. He grants significant operational autonomy to the Boy Detectives Club.

His traumatic childhood involved abuse from his biological father before the original Kogorō Akechi rescued him. The detective became his adoptive father figure and mentor. Kogorō served as the original detective's assistant before ultimately assuming his name and legacy. This personal history deeply informs his protective, guiding role for the young detectives.