Percy Weasley is one of the Weasley siblings in the Harry Potter books, and the family black sheep. He was also a prefect during his time at Hogwarts as a student and he was also outraged at Draco Malfoy for calling Hermione Granger a mudblood. He is a very by-the-rules and no-nonsense person and eventually disowns his family out of misguided loyalty to the corrupt Ministry of Magic. After Cornelius Fudge was been overthrown by the wizarding community for being a liar - failing to announce the return of Voldemort, discrediting Harry Potter and Albus Dumbledore, informing of Cedric Diggory's death was a tragic accident and allowing Dolores Umbridge to become Headmistress of Hogwarts -, he still works at the Ministry of Magic under to Rufus Scrimgeour. He eventually sees the error of his ways and redeems himself by participating in the Battle of Hogwarts and avenges his fallen brother Fred.
Order of the Phoenix
Other Wizards & Witches
Hogwarts School of Witchcraft and Wizardry