In his new duties as a prefect, Percy was responsible for the new first year Gryffindors, including bringing them to their dormitories on the first day, and to lead them to safety during Hallowe'en in 1991, following the arrival of a troll in the dungeons. At some point in his fifth or sixth year, Percy began dating Penelope Clearwater, a Ravenclaw prefect, though he kept it a secret from his family, most likely to prevent his twin brothers Fred and George from mercilessly teasing him (which they did most of the time). Back at school, Percy's duties as prefect led him into conflict with his brothers when he caught Ron in Moaning Myrtle's bathroom, and Fred and George's loud, sarcastic proclamations over Harry Potter being the Heir of Slytherin.He remained at Hogwarts during the Christmas period in 1991, and sat his O. Percy spent much of the summer of 1992 in his room exchanging letters with Penelope Clearwater, and his family only saw him at mealtimes. He tried to look out for his sister, Ginny, once forcing her to take Pepperup Potion because she looked ill, and by trying to assuage her fears that Ron's behaviour would get him expelled.
He was responsible for authoring a report on standardising cauldron thickness, and learned about the plans for the Triwizard Tournament, which he took great delight with in hinting about to his younger siblings.
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.
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 He was a small child during the height of the First Wizarding War.