Despite being known in China as a kindly old magician, Fo secretly hides his true identity as an ancient assassin who has no qualms about killing others. He participated in the first two Toshinden tournaments and later met a humanoid ape named Bayhou. He passed on his iron claws to the creature and trained him in combat. It is believed that Fo was eventually killed by Bayhou, as evidenced by the skull-shaped object on Bayhou's back and the character model of Fo used for Bayhou's hidden outfit, which depicts him as a zombie with a bloody claw mark on his back.