It's likely you're thinking of Bill Weasley, who is a character throughout the series. He is the eldest son of Arthur and Molly Weasley and plays a prominent role in *Harry Potter and the Deathly Hallows*.
Bill Weasley is a Gryffindor and a skilled Auror. He is known for his long, shaggy hair, his kind nature, and his love of dragons. He is married to Fleur Delacour, who he met during the Triwizard Tournament.
Bill is injured in the Battle of Hogwarts, but he survives and plays a vital role in the final fight against Voldemort.