Finn leads the Yurei Detective Club, an unregistered group on Tom Sawyer Island. He has long dark hair, dark brown eyes with long lashes, and wears a tan hat plus a long robe featuring purple and gray details that covers his feet. As an unregistered "Yurei" in the Deco system, he remains socially invisible to island authorities and mainstream citizens. He created the SOS service—later attributed by some sources to Hank—which generates isolated Hyperverse spaces for the club's investigations. Finn also serves as a first-class chef, preparing tangible meals during club gatherings. His operations included faking the deaths of Berry and Hack after their escape from authorities, integrating them into the Yurei community once declared legally dead. He later aided Berry in extracting Zero Phenomenon data and provided technological support for her infiltration of Hack’s trial. Finn’s motivations stem from living in an unregistered community near a neglected waste management plant; its disrepair persisted despite repeated reports to the Customer Center, highlighting systemic disregard for marginalized areas. This fueled a personal agenda distinct from the club’s Phantom Zero investigations. He founded the Yurei Detective Club primarily to advance these hidden objectives. Exposure of his true intentions incited hostility from his former community, triggering a riot against the club. Simultaneously, authorities discovered Berry and Hack were alive, leading to a crackdown on the group and the arrest of Berry’s parents for covering her survival. Pursued by Customer Service, Finn’s plans and leadership collapsed entirely.