Makata Jin

A mysterious person of Kaito's childhood who had served as something of a master to both Kaito and Rook. His real name is later revealed by Rook in episode 13 from 1st season. He once was kept captive by the P.O.G. [spoiler]Years ago, Jin contracted with the Orpheus and became a solver for the P.O.G. However, one day, Jin received a vision of the future, showing the world being destroyed by Pythagoras. Jin quit P.O.G and went into a journey to fight Pythagoras in the Puzzle of God. The results of the fight remains unknown.[/spoiler] The origin of his name comes from "魔方陣, Mahoujin" (Magic square).