Mrs. Peterson is a 2nd grade teacher at J. Edgar Hoover Elementary School, who teaches Riley Freeman. She only appeared in the first few years of the comic strip.

Peterson is a very strict, no-nonsense authoritarian. She previously worked as a prison guard, and before that a nun. She once failed a Romanian girl for being bad at English, even though she was good at math. Not surprisingly, she doesn't tolerate Riley's hooliganism, and frequently sends him to detention (which he has spent more time in than her classroom).

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