Xenophilius Lovegood is the owner and publisher of The Quibbler, a wizarding tabloid newspaper known for its outrageous articles about mythical (possibly extinct?) magical creatures that no one but the Lovegoods ever seem to have heard of. He is also Luna Lovegood’s father, and a firm supporter of her good friend Harry Potter, known throughout the wizarding world as the Boy Who Lived (and, later, as the Chosen One). He is the one Harry, Ron and Hermione turn to in Deathly Hallows when trying to find more information on a strange symbol they found in an old copy of Beedle the Bard that Dumbledore bequeathed to Hermione. Harry remembered seeing Xeno wear a pendant bearing the symbol at Bill and Fleur’s wedding, and decided to ask him what it meant, knowing that Dumbledore would not have drawn it into his book and then given that book to Hermione without good reason.
Upon reaching the Lovegoods’ home (which resembles a chess piece), the Trio begin to realise where Luna gets her eccentric nature from, not just because of the house’s design, but also from a sign by the front door that reads “Keep off the dirigible plums.” They have no idea at the time what dirigible plums are, but later find out they’re the orange radish-looking things on Luna’s favorite earrings (yet more proof that she gets her unique way of looking at things from her father). When Harry asks him about the symbol, Xeno tells them it’s the symbol of the Deathly Hallows. Harry has no idea what he’s talking about, but when Xeno mentions the tale of the Three Brothers, Hermione pulls out the book she inherited from Dumbledore and reads the story. Xeno then informs them that the three items mentioned in the story are the Deathly Hallows, and that witches and wizards have been searching for them for centuries. Hermione refuses to believe that they actually exist, but later comes to realise that not only do they exist, but that Harry has all three of them in his possession (at least, once he finally has the Elder Wand in his hand).
Xeno dotes on his daughter Luna, even letting her write many of the articles for the Quibbler. Although he spends much of his time chasing down stories for his paper, and printing the paper in his own living room, he still finds time to spend with his only child, whom he’s been raising alone since her mother died when Luna was only nine. That may be why he lets her write much of the paper’s articles herself, and takes her with him on his magical creatures hunts when she’s not in school—so that they can spend as much time together as possible, and share a passion for the weird and unusual that borders on the absurd to the casual observer, but in reality gives them a solid foundation for their relationship. However mythical the creatures they seek may be, at least they are searching together, spending as much time together as possible, something every parent should aspire to—to find a common ground with their children, something they can share with them for years to come, creating a bond that will last a lifetime.