Mr. J operates as a high-ranking Headmeters operative within the secret society Fraud, commanded directly by its leader, Kuu Ragua Lee. His Headmeters classification of level 40 signifies potent psychic abilities, placing him among top agents like K2. Physically, Mr. J appears youthful, characterized by long hair and a sexless presentation.

His primary function within Fraud is commanding the unit pursuing the fugitives Kei and Ai, a central focus of his activities. Mr. J maintains a deeply personal relationship with Kuu Ragua Lee, serving as his page boy while harboring intense admiration and emotional attachment. This dynamic fuels a persistent anxiety that Lee might withdraw his attention or favor, driving Mr. J's motivations.

Mr. J's role remains consistently focused on executing Fraud's objectives under Lee's authority. There is no documented evolution in his personal trajectory, abilities, relationships, or circumstances beyond his established function within the organization and psychological dependency on its leader.