Miss Circle is the main antagonist of Basics in Behavior, where she makes her debut, and most likely the rest of the Fundamental Paper Education series. She is a teacher at the School and she kills students who fail or misbehave in class. Miss Circle is suspected of having committed brutal murders and also carried out cannibalism on her students. This can be interpreted in two ways. Firstly, Miss Circle is feared by other students. Secondly, Miss Circle may seek revenge if her students fail to achieve high grades or receive an F in her class. This is why Miss Circle is called "Teacher Killer" because of her violent and cruel behavior toward her students who fail their educational tests or exams, meaning no one could stop her. Miss Circle has spiky long hair with black demon horns that are similar to cat's ears. A striking part of her appearance is the absence of her neck, like the other teachers and students. Instead of a hand. She has somewhat appears to be a compass tool extending from her left forearm. The point is retractable, and she uses her compass tool as a weapon. She wears a white collared black shirt with two buttons and white pants with pockets. And she wears black boots. Miss Circle is shown to be very cruel and violent. She shows no mercy towards her students that failed in school, killing them. She is also known to play favorites, as both Zip and Oliver are teacher's pets.