"The Knight" (騎士, Kishi) was one of the four passengers who accompany Victorique de Blois and Kazuya Kujo on the train cabin from Beelzebub's Skull. He is a burly man who introduces himself as a "knight" in what seems to be a masquerade inside the train. In this game of masquerade, he referred to The Orphan as his "Princess".
He was a spy working for the Science Academy of Sauville. After his successful rendevous with fellow spy The Orphan in the train cabin, on her discreet orders, he followed, interrupted the escape of, and consequently killed The Scarecrow to retrieve the Memento Box.
He died when he could not duck in time as the train moved into a sheltered tunnel.