Muggles' Guide to Harry Potter/Characters/Mrs. Norris

Overview
Mrs. Norris is a cat, the pet of ../Argus Filch/, the caretaker at Hogwarts. She is described as a little, tattle-tailing, cat that thrives on getting students in trouble. She is almost skeletally thin, but Filch evidently cares very deeply for her. For unknown reasons.

Philosopher's Stone
When Harry, Ron, Hermione, and Neville are in the Trophy Room waiting for ../Draco Malfoy/ to arrive for the promised Wizard's Duel at midnight, Filch's approach is heralded by us overhearing him talking to Mrs. Norris.

As Harry is on his way to the library at Christmas, under his Invisibility Cloak, he passes Mrs. Norris in the halls. Mrs. Norris seems to be able to perceive him, but may not be able to recognize him as a student; in any event, she allows him to pass without going for Filch.

Chamber of Secrets
During ../Nearly Headless Nick/'s Deathday party, Mrs. Norris is Petrified and left hanging by her tail from a torch bracket. Filch is fiercely angry at this, demanding that someone must be punished. He spends much of the book sitting at the spot where Mrs. Norris was actually left hanging.

Relationships with Other Characters
Mrs. Norris seems to distrust all of the Hogwarts students, and seems to have no mission in life other than to report their infractions to Filch. In return, all of the students detest Mrs. Norris, and many have expressed a wish to do her harm; however, whether through their fear of Filch or their inability to catch her, no harm has yet befallen her from the students.

Analysis
Mrs. Norris seems exceptionally smart for a cat, to the point that we might think her a cat / Kneazle cross like ../Crookshanks/, an Animagus, or Filch's familiar, it those existed in this world. However, the author has stated that she is just a highly unpleasant cat.