A tall man wearing a mask. A math teacher. Gentlemanly. He likes mathematics and memes. He hates incorrect answers and wearing a dirty jacket. He kills students who get problems wrong with an axe. He holds Guest in high regard as a rare, excellent transfer student who doesn't make mistakes.

The principal of this school. Female. Wears a ponytail. She has no face. Strict. If she catches a student breaking school rules, she relentlessly drags them to the punishment room at the back of the school. Even harsher punishments await bad students who break the rules repeatedly...

The school janitor. A man whose entire body is red. A skeleton. Wears short sleeves and shorts. If there is trash on the floor or a locker is left open, he will stop whatever he is doing to fix it, no matter how busy he is. He has been known to ruthlessly sweep away students who get in the way of his cleaning.

The school chef. Found in the cafeteria. An urban legend character from a typing game. Visiting his kitchen regularly to help with the cooking might lead to good things. However, students who don't help out enough often end up becoming the ingredients themselves.