AceShowbiz - There have been a lot of theories that fans made about the story of "Harry Potter". The most popular one is the theory regarding the "Three Brothers" story from "Harry Potter and the Deathly Hallows: Part I". Fans have made analogy and speculations that the classic wizarding story is supposed to be an allegory for actual "Harry Potter" characters. Recently, author J.K. Rowling reveals the theory from fans which she likes the most.
When a Twitter user asked Rowling about her favorite fan theory, the writer answered, "Dumbledore as death. It's a beautiful theory and it fits." Death is a minor antagonist featured in the wizardry fairy tale "The Tale of the Three Brothers". The tale follows the three Peverell brothers (Antioch, Cadmus, and Ignotus) who posses magical abilities.
The three of them receive rewards from Death: the unbeatable Elder Wand, the Resurrection Stone that brings people back from the dead, and the Invisibility Cloak, which turn out to be the things that bring them to death. These three items are often referred to as "The Deathly Hallows", similar to the name of the final book of the "Harry Potter" series.
As the theory goes, Voldemort is claimed to be the oldest brother, murdered in his bed by someone who sought the Elder Wand. Snape is seen as the middle brother, who attempted to resurrect his lover, Lily Potter. Harry would be the youngest brother, who escapes Death with the cloak before greeting "Death as an old friend."
It is not surprising if Rowling chooses the Dumbledore theory as her favorite. It really fits the plot because according to fan's post in Tumblr, "he [Dumbledore] greeted Harry at King's Cross and was the one behind Snape and Voldemort's death. He's the one who gave Harry the invisibility cloak too. And he had the stone and the wand too."