Paku is a Cupid who serves the Angel Raguel. He is a cowardly, incompetent, and troublemaking angel who has known Haamiru for a long time. Ten years before the story began he attempted to give the power of angels to the human baby Takaharu Ougi, but thanks to his incompetence he ended up giving the power to Masaki Kuzuha as well. He is constantly worried of his master learning of his mistake.
Paku is now the servant of Michael and meets with Haamiru at the beginning of the game. In Fire Book he is sent to meet Jin and introduces himself after seeing that he's behind him. He would later watch the fight between Jin and Mephisto, only for Paku to reveal afterwards that it was actually Akira. Paku would send the children kidnapped by Enoch to a safe place after they are rescued. He will join Jin at his masters request just before they enter Niflheim. He gives Akira aid several times during Ice Book.