Tōma Akechi sports long, untidy white hair and favors a trench coat. He operates his own detective agency, identifying professionally as a detective. His exceptional deductive reasoning manifests in accurately uncovering personal secrets or solving minor mysteries through logical analysis of seemingly trivial details. This skill emerged early, establishing him as a child prodigy detective who tackled cases from a young age. Akechi habitually launches into lengthy, overly dramatic monologues while explaining his deductions, remaining oblivious to their effect on others. He exhibits a persistent, somewhat obsessive personality, especially concerning mysteries or secrets he targets. This fixation frequently centers on Kusuo Saiki, whom Akechi repeatedly tries to expose, aiming to deduce Saiki's hidden secrets and psychic abilities. Saiki consistently employs various methods to thwart Akechi from fully revealing these secrets or completing his deductions aloud, finding the monologues a significant annoyance. Despite Saiki's avoidance efforts, Akechi often appears unexpectedly. He interacts with other characters, sometimes solving their minor problems or deducing information about them during group activities. Akechi occasionally assists with cases or confronts criminals, though his deductions can be interrupted. His unwavering persistence in pursuing deductions, particularly regarding Saiki, remains constant. Akechi maintains a rivalry with fellow detective Makoto Mikoto, often sparring to solve cases first. He displays confidence in his own abilities and methods. His background includes independently solving cases since childhood, leading to his agency's establishment. Across appearances, no significant long-term evolution or alteration in his core personality traits occurs. Akechi consistently serves as a source of deductive exposition and comedic interruption through his monologues and relentless pursuit of mysteries.