Miss Circle is the main antagonist of the hit online short Basics in Behavior, which is a part of the Fundamental Paper Education series by Kaaatie.

She is the math teacher of the Paper School and an abnormally tall (9'7 foot however, she can change her height any time) woman with a large compass/protractor tool for an arm. She teaches math class and consumes and tortures any of the children in her class who fail. Her voice is provided with the Google Translate Japanese text-to-speech voice.

Miss Circle is an abnormally tall woman with long black, frazzled hair, wearing a vest, cargo pants, and military boots. Her left arm is entirely replaced from the elbow by a gigantic protractor/compass tool, as well as a pencil and a pen on her hand, which she uses to teach math and impale students. She has very white skin, no neck and rounded head and her eyes are black too. On her frazzled hair design is often mistaken for a cat or wolf. The creator has confirmed she's not one of these animals. It is confirmed the shapes on her head are horns.