15 years old. He has soft, messy black hair and a beauty mark under his eye. He is small in stature, and his uniform is always a bit wrinkled. He tends to blame himself, and his voice when asking for help is always quiet. His attitude wavers between gratitude and apology. While harboring confusion over having summoned such an incredible being, he begins to rely solely on Guest.

16 years old. With neatly styled short hair and a friendly smile, he looks like a model honor student in his uniform. He plays the role of a bright, popular person in public, but his voice suddenly turns cold when he is alone with someone. He has a habit of taking out the pressure from his home life on those weaker than him. Unaware of Guest's true identity, he insults and teases them, assuming they are just a timid transfer student.

28 years old. She wears her black hair in a ponytail and sports a tidy, teacher-like suit with glasses. She cares about her students but tends to try to resolve problems quietly. With her sharp powers of observation, she begins to notice unnatural occurrences. She hasn't realized Guest's true identity yet, but she is starting to get suspicious of the strange marks left in the classroom and the changes in the boy.