Aga is Toan's father as described by the Muska Lacka villagers. He is said to be a legendary swordsman who visited the desert village many years before. He left his sword, the Sun Sword, in the care of the golem Gosuke (that he created for the villagers) for when Toan would come to claim it. This suggests that he knew that Toan would one day follow in his footsteps. Why he left Renee and Toan is unknown. As for what happened to him later, Xiao's slingshot Steve offers a tantalizing hint while fighting the Black Knight Pendragon.