Are these true, or just 'Riddikulus'?
Hungry Hungry Horcruxes

Source: Warner Bros. Pictures
Though we have a general understanding of horcruxes, it is never explained to the reader in detail exactly how they work. While we know that you have to kill someone in order to split your soul and keep a fragment of it in a nearby object, fans have long since speculated on the specifics behind this particularly nasty piece of dark magic. And they think they found the real answer.
“JK Rowling never revealed exactly how Voldemort managed to split his soul into seven pieces and evade death. Reddit user, sirlionel13 theorised that he did it by eating his victims. She argues that cannibalism throughout history has been associated with gaining strength, and the only way to make a horcrux is through murder.”
The theory admits its own weak points, specifically regarding Moaning Myrtle and Harry himself. But that’s some heavy food for thought.
I’m Gonna Live Forever

Source: Warner Bros. Pictures
Is Harry immortal?
You might not think so, especially if you’ve read about how he’s aging in The Cursed Child. This theory heavily analyzes the prophecy that so determined the course of events of the novels.
Though it states, “neither can live while the other survives,” it also says, “either must die at the hand of the other for.” Does that mean that only Harry and Voldemort are capable of killing each other? So if one is dead, the other can’t be killed? And didn’t Voldemort technically kill himself when his curse rebounded?
“This theory questions that premise and asks if it really means the only way that either of them could die was at the hands of the other. Hence by killing Voldemort, Harry forfeits his death – the ultimate sacrifice for Harry, as it means he’ll never be reunited with his deceased friends and family.”
Who is J. K. Rowling, really?

Credit: AFP/ Getty Images
Does J. K. Rowling appear in her own novels? And is she an antagonist? For the many people who believe that she is actually Rita Skeeter in the flesh, the answer would be yes.
“The theory goes Rita was banished from living in the magical world after it was discovered that so much of her work was fabricated.
“She then went to live with the Muggles, and fell upon difficult times, so turned to writing in an effort to make a living for herself. This would mean Harry Potter is 100% true, which makes sense to me, clearly my home is just unplottable and the owls haven’t found me yet.”
And now for Draco Malfoy: Just who is he, really?