Persona

Persona is the moderator for the Dangerous Ability Class, an educator who keeps his identity hidden behind a permanent mask. Under the alias Serio, he works as a substitute teacher, though he uses this persona to manipulate others and hide a deep sense of loneliness. He possesses a lethal ability known as "Mark of Death" Alice and utilizes mysterious black stones to control powerful abilities, leaving victims like Mikan and Subaru Imai with devastating illnesses. His actions frequently target Natsume, even extending to holding Natsume's sister, Aoi, hostage.