A senior at Hope's Peak High assigned to the Hogwarts Student Building as a Slytherin student and main protagonist. A very talented young man but with a boorish, unphased, cool, and intimidating demeanor that can easily petrify someone or make them want to stay away from him. Though not skilled in any arts of magic, he has been shown to have genetic powers of his own similar to that of a wizard to the point it's far beyond what anyone can comprehend, being equally powerful to that of Voldemort. He's also very cocky and arrogant, often marching to the beat of his own drum. Still, there are times where he doesn't know his directions to the point it's questionable. He is currently looking after Harry, Ron, and Hermione, who often has to remind him of his directions every time he goes the wrong way. He's also a Persona-user, which doubles his power over Voldemort's. Cailleb can forge a strong bond with Yataro and, upon maxing out the Confident, can allow him to fuse the Sub-Initial Persona, Merlin.