Luna Lovegood
While Luna is not directly mentioned in this book, her existence is first alluded to at Stoatshead Hill where the Weasley family, minus Mrs. Weasley, along with Harry and Hermione meet Amos Diggory and his son Cedric to catch a Portkey to the Quidditch World Cup. The Lovegood family is mentioned when Amos asks Arthur if they are expecting more wizards to meet them at the Portkey. Arthur replies that the Fawcetts were unable to get tickets and the Lovegoods arrived a week earlier.