Ryūnosuke Akutagawa is a sharp-minded, aloof figure whose emphatic hand gestures punctuate his calculated remarks. Known among peers as an enigmatic genius, he earns consistent recognition—particularly from Kyōsuke Kindaichi—for voicing ideas that provoke intellectual intrigue. His interactions with associates like Kindaichi and Takuboku Ishikawa reveal a detached yet incisive demeanor, as his keen observations often pierce through ambiguities to unravel case complexities.

Central to his philosophy is the belief that contradictions within evidence can shroud truth, a principle he articulates during investigations. His name reflects symbolic layers: the given name Ryūnosuke derives from “dragon” (龍), “this” (之), and “herald” (介), while his surname Akutagawa merges “mustard” (芥) and “river” (川).

His role remains anchored within the investigative team, defined by a cerebral approach to solving cases and an unwavering focus on dissecting hidden truths.