The Hogwarts poltergeist. Though his usual habit is to make life horrible for students and he only barely accepts the authority of Hogwarts teachers, he uncharacteristically takes an order from Fred and George when, upon their departure from the school, they ask him to give Umbridge hell for them. Peeves takes this order seriously, causing mayhem that is directly intended to make Umbridge’s life miserable.
Peeves Character Timeline in Harry Potter and the Order of the Phoenix
The timeline below shows where the character Peeves appears in Harry Potter and the Order of the Phoenix. The colored dots and icons indicate which themes are associated with that appearance.
...Skiving Snackboxes in her classes and insist they have "Umbridge-itis." Harry also witnesses McGonagall telling Peeves how to unscrew a chandelier. In Charms one day, Ron laments that Mrs. Weasley will... (full context)
...She suggests they use Umbridge's fire to contact him. Ron decides to tell Umbridge that Peeves is causing trouble, while Ginny and Luna decide to stand on either end of Umbridge's... (full context)
...days before the end of term. Umbridge leaves the school two days later, chased by Peeves when she finally exits. Harry considers skipping the end-of-term feast to pack and avoid the... (full context)