One of the teachers at Wickwood, and the keeper of Corn's binding gemstone, Ketel teaches curses/hexes and demonology. He is strict and stern, verbose, and, above all else, professional. He spends a lot of his time outside of class babysitting the chaotic demon that's bound to him, and he's sick of it.

Ketel's voice is very clear and pronounced, but deep. He can get a lot of emotion across despite the low pitch of his voice, and he is quick to correct himself should he make mistakes. He speaks with complex words and rarely curses unless driven to his limit.