Ijeiska, Diego

He was the headmaster of the Hero Academy and teacher of the selective class Jerga-Kanon.

Like most of his elite students, Diego is arrogant toward the Demon King Academy and its students. This obsession with human superiority is demonstrated when he belittles Delsgade's students at any given opportunity, going as far as cheating during magic demonstrations and exams to humiliate them.

[Spoiler] Diego is one of only two known clone types created by Eleonore using suitable sources from past heroes as templates, the other being Zeshia Bianca. Because the Diego-type specializes in education and was the most susceptible to Jerga's voice, which hid inside Aske, he was the perfect teacher to instill hatred in the new generation of heroes. [/Spoiler]

[Spoiler] Like the top four students of Jerga-Kanon, Diego believed himself to be the Hero Kanon's reincarnation and wrongfully took his name. As the Hero Academy's headmaster, he secretly prepared for a second war against Dilhade and invited the Demon King Academy to an educational exchange to create justification for that. [/Spoiler]