Argus Filch is a fictional character from the Harry Potter Universe
 BackgroundArgus Filch is the Caretaker for Hogwarts. He is a nasty old man, who hates students and has a faithful cat, Mrs. Norris. He has always been trying to get Dumbledore to allow him to hang kids upside down from their ankles if they do anything bad for years, but Dumbledore won't allow him.
In Harry's second year, he discovers that Filch is indeed a Squib, or a person who is born into a Wizarding Family, but can't do magic. Filch's worst enemis are the Weasley twin and Peeves the Poltorgiest. The Weasley's have been causing Filch headaches for years, and they even took the Marauder's Map from his office in their first year. Filch has been trying to get Peeves kick out of Hogwarts for years, but Dumbledore wont allow him. In the fifth book, after Dumbledore is gone, Filch is the only staff that actually helps Umbridge. She allows him to hang kids upside-down from their ankles and other torture-like punishments. She also allows him to get rid of Peeves, but he only cause Umbridge and Filch more damage thanks to Fred and George, whom told him to give her hell.