Tōma Akechi attends PK Academy in the same class as Kusuo Saiki. He identifies as a detective, fueled by an intense passion for solving mysteries and uncovering truths, especially those surrounding the seemingly mundane events involving Saiki. Akechi possesses exceptional deductive reasoning and observational skills far beyond the ordinary, enabling him to spot inconsistencies and patterns others miss. As the son of a renowned detective, his abilities suggest inherited talent or early nurture. He constantly seeks mysteries to solve, instinctively fixating on Saiki, whom he recognizes as extraordinary despite remaining unaware of Saiki's psychic powers. This fixation leads Akechi to frequently appear near Saiki, delivering rapid-fire, intricate, and overly detailed monologues analyzing situations or Saiki's behavior. Saiki finds these monologues mentally exhausting and actively avoids Akechi. Akechi's distinctive appearance typically includes a hat and cape-like coat, reinforcing his self-styled detective persona. His rapid speech during monologues overwhelms others. Despite Saiki's attempts to evade him, Akechi is persistent and occasionally involves himself in events concerning Saiki and his friends. His deductive skills prove surprisingly effective; he accurately deduces complex situations, like the mechanics behind Nendō winning a lottery or the true nature of events manipulated by Saiki's powers, often coming remarkably close to the truth without confirming psychic abilities. This persistence sometimes leads to his temporary inclusion in Saiki's group. A significant development occurs when Saiki, needing assistance, temporarily grants Akechi psychic powers. During this time, Akechi's natural deductive abilities merge with the new powers, making him exceptionally capable. He assists Saiki in resolving a crisis. Afterward, his powers are removed, and his memory of the event is erased, though his core personality and deductive drive remain unchanged. Throughout the series and its Reawakened continuation, Akechi maintains his relentless pursuit of mysteries and analytical monologues. He continues as a recurring figure, sometimes unintentionally aiding the group through his deductions. He operates under his self-defined detective code focused on uncovering truth, always oblivious to the supernatural elements he brushes against, and participates in group activities and school events alongside Saiki's classmates.