I've been doing a lot of Pixar theories, but what I'm going to do right now is a theory about Harry Potter (not the bad one about the time-traveling Ron = Dumbledore), but one that is plausible.
Could Albus Dumbledore represent death?
In Harry Potter and the Deathly Hallows, there is a tale named "The Tale of the Three Brothers". You can see the scene in which the tale is told here:
There are three brothers: one gets an Elder Wand, the most powerful wand in existence. The second gets a Resurrection Stone, that will call loved ones from the grave. The third gets an Invisibility Cloak, a cloak that will make anything invisible. All of these were given to the brothers by Death.
Tom Riddle (or Lord Voldemort) represents the first brother. In the Deathly Hallows, Voldemort retrieves the Elder Wand, and dies for power, which happened to the first brother in the tale.
Severus Snape represents the second brother, who died for love. Snape did the same in the Deathly Hallows, as he died for his love of Lily Potter (what I never understood is, if Snape loved Lily so much, did he actually think she would like it if she found out how mean he was being to her son?).
Harry Potter represents the third brother, who had an Invisibility Cloak. Harry and the third brother are both humble men who want to live long and happy lives without the fear of Death.
Here's where Dumbledore fits in. Dumbledore got the Elder Wand from a duel with Grindelwald, making Dumbledore the master of the Elder Wand. Dumbledore is the last one to use it before Voldemort does. Dumbledore also got the Resurrection Stone from Tom Riddle's ring and passed it on to Harry. At one point, Dumbledore borrows the Invisibility Cloak from James Potter (Harry's dad) for further inspection and gives it to Harry after James dies. Everything Death gave the three brothers is what Dumbledore had at one point.
Also, at the end of the Tale of the Three Brothers, the third brother greets Death as an old friend and departs this life. At the end of the Deathly Hallows, Harry is in Limbo, the state of being between life and death. And who does he greet as an old friend once there? Dumbledore.
This theory has been approved by the author and mastermind of the Harry Potter series, J.K. Rowling in this Tweet.