Finnegan is proud to serve as a summoner to the mysterious Phantom Society. A former boxer, his COMP uses brass knuckles-type weapons. One of the organization's top summoners, he has frequent encounters with the protagonist. Self-confident and skilled, he is popular but has many enemies.
He is first encountered during Urabe Kouichirou's Vision Quest (where the protagonist sees Urabe's final moments). He finds Urabe in the computer room, where Urabe downloaded Nemissa to his GUMP (after deleting the Devil Summoning Program), and mocks him. Urabe attempts to escape, but is eventually cornered and killed by Finnegan's demons.
He appears at the beginning of the second Vision Quest where Nishi had given orders to Judah to deal with the demon at the airport. Finnegan is later sent there after Judah's failure and kills Winpe permanently, disappointed by how weak Judah was to get killed by the demon. After meeting the protagonist and Nemissa, who blurts out that they know the Society's plans, he sics a Yato no Kami, La Llorona, Jueyuan, and Bai Suzhen on them. He leaves afterwards, believing his demons will finish them off.
Realizing that they beat his demons, Finnegan posts a challenge to them on Summoner Net.
Devil Survivor 2
Many characters from Devil Summoner: Soul Hackers are the bidders in the Devil Auctions, of which includes Finnegan.