Robert Belnades (Universe-62119)

Robert Belnades is a peculiar man that Zack meets in Regalia at the start of The King's Sword Vol. 1.

He mentors Zack throughout the story, training him in combat and in magic. However, by the end of the first volume, his appearance changes and he is revealed to be the heir to the Demon King's throne. After this point, he becomes the main antagonist for the rest of the series.