Satan Yamada transferred into the class in June 2020 and demands to be called by his first name "Satan," reacting with visible distress—including tears—when referred to as "Yamada." He projects a boastful, confident exterior that masks a sensitive inner nature, deliberately hiding genuine emotions and kindness to uphold his cool image. Despite this facade, he remains fundamentally caring. He harbors a notable fear of ghosts. His appearance features distinct purple hair with longer front sections and red eyes, dressed in the standard male school uniform layered under a pitch-black sweater.