Rook Banjou Crossfield

Kaito's childhood friend. He is actually the chief commander of P.O.G and Baron Pythagoras's confidant. He is also a P.O.G Giver and an Orpheus Armlet's owner. However, he loses the Orpehus Armlet due to losing to Kaito in a Fool's Puzzle that Rook made. Because of this, he gets his 'sanity' back and starts traveling around the world.