The cantankerous caretaker at Hogwarts. He has a cat, Mrs. Norris, who helps him patrol the corridors. He doesn't like students, suspects them all of mischief, and is a fan of horrific corporal punishment that in the novel's present is illegal. Fred and George share with Harry that Filch has a drawer full of potentially dangerous confiscated items, from which they stole the Marauder's Map in their first year.
Filch Character Timeline in Harry Potter and the Prisoner of Azkaban
The timeline below shows where the character Filch appears in Harry Potter and the Prisoner of Azkaban. The colored dots and icons indicate which themes are associated with that appearance.
...that the Fat Lady's portrait has been destroyed. Just as Dumbledore asks McGonagall to find Filch, Peeves floats overhead and cackles with delight. He says that the Fat Lady is hiding... (full context)
...of parchment and George explains that when they were first-years, they got in trouble with Filch. While he was threatening them, they noticed a cabinet labeled "Confiscated and Highly Dangerous." George... (full context)
...It also shows a number of secret passages into Hogsmeade. Fred points out several that Filch knows about, one that starts under the Whomping Willow, and one that leads into Honeydukes.... (full context)