He took the rules very seriously, and did not believe that Fred and George Weasley would get very far with their jokes. It was also once stated by his brother Ron that "Percy wouldn't know a joke if it danced naked in front of him wearing Dobby's tea cosy". A high achiever, he went to work at the Ministry of Magic after leaving school, working in the Department of International Magical Cooperation under Barty Crouch Snr and later as Junior Assistant to the Minister for Magic himself.
However, Percy's rise through the Ministry caused a rift between him and his family following the return of Lord Voldemort. His father thought that his promotion to Minister for Magic Cornelius Fudge's office was a plot by the Minister to keep tabs on the Weasleys, and through them, Albus Dumbledore. Percy denied this and remained steadfastly loyal to the Ministry's line that Voldemort was not back, estranging himself from his family and furthermore condemning them for their support of and affiliation with Albus Dumbledore and the Order of the Phoenix. Even though the Ministry did accept that the Dark Lord had indeed returned following the Battle of the Department of Mysteries, Percy's pride stopped him from reconciling with his family.
After the fall of the Ministry to the Death Eaters in 1997, Percy was finally made to see sense and was ready to accept that he had been wrong the whole time about the return of Lord Voldemort. Percy was tipped off by Aberforth Dumbledore about the Battle of Hogwarts in 1998 and finally made up with his family. He survived the battle but was grief-stricken over the death of his brother Fred, whom he was fighting alongside and was determined to avenge.
Following the downfall of Voldemort, Percy returned to work for the Ministry and became Head of the Department of Magical Transportation under the new Minister for Magic, Kingsley Shacklebolt. He married a woman named Audrey and had two daughters, Molly, named after her paternal grandmother, and Lucy.