Xenophilius Lovegood is the eccentric father of the equally eccentric Luna Lovegood. He and Luna were very supportive of Harry when no one else was. It was at the wedding of Bill Weasley and Fleur DeLacour, where Harry recognized the symbol of The Deathly Hallows. Xenophilius was wearing the symbol as a necklace.  While Xenophilius may be eccentric and out there, he played an important role in Harry’s realization that he did in fact posses two of the Hallows.