Miss Circle is the main antagonist of the hit online short Basics in Behavior, and possibly the main antagonist of the entire Fundamental Paper Education series by Kaaatie. She is the math teacher of the Paper School, and an abnormally tall demonic woman with a strange compass/protractor tool for an arm. Despite not being anything more than a teacher, she seems to hold immense power over the school, acting like a tyrant with an iron fist. She is voiced by Google Translate's Japanese text-to-speech voice.

Miss Circle's personality is that of sadistic enjoyment. She is an entirely sadistic entity, who holds favorites and punishes those who fail the simplest of tasks harshly and violently. She also seems to be a bit of a goofball, as she can be seen spinning down the hallway in a T-Pose, and doing a cat-face. Whenever a student fails a test, she grins widely, and begins rapidly chasing them for her own pleasure and to torture them. Despite her cruelty and sadism, she does seem to play favorites and even have friends in the school. Oliver, Zip, and Edward seem to be her favorite students. Her "friends", are Miss Bloomie, and Miss Thavel. She also seems to fear Alice, though it is unknown why.

Miss Circle is an abnormally tall woman, with long black, frazzled hair, who wears a vest and cargo pants, along with military boots. Her left arm is entirely replaced from the elbow down by a gigantic protractor/compass tool, which she uses to both teach math and impale students.

Miss Circle's design is often mistaken for a cat or wolf. The creator has confirmed she's not one of these animals. She loves to eat Oreos. Given her non-human features (Sharp Teeth, Horns, and an abnormal arm) whether she is human or not is ambiguous.

You know how she is, if you fail, you're done. Although there are times when you can, perhaps, convince her in some way and not die, you just have to be smart.