'You were the seventh Horcrux, Harry, the Horcrux [Voldemort] never meant to make. He had rendered his soul so unstable that it broke apart when he committed those acts of unspeakable evil, the murder of your parents, the attempted killing of a child. But what escaped from that room was even less than he knew.
Harry is not a Horcrux. Because no word exists in wizard lore for the accidental phenomenon that occurs when a piece of Voldemort's unstable soul fragments and lodges in Harry's living body, Dumbledore explains the phenomenon as an “accidental Horcrux”. However, as Brandon Layne points out, Harry is not a Dark Object.
Creating a Horcrux requires committing an act so heinous that it tears apart the creator's soul, usually through cold-blooded murder. Harry Potter himself unintentionally became a Horcrux for Voldemort when the Dark Lord's killing curse backfired, which ultimately led to Voldemort's defeat.
Harry's scar not only fulfilled the part of the prophecy about Voldemort marking him, but that mark inadvertently caused the boy to become one of the seven Horcruxes created to prolong his life. It also imbued him with some of the Dark Lord's power, like the ability to speak and understand Parseltongue.
During Voldemort's attack on Godric's Hollow, where the Potter family had lived, his killing of Harry's parents inadvertently created another Horcrux, one that would dwell on inside Harry.
Why Didn't Voldemort Realize Harry Was a Horcrux? - Harry Potter Theory
How did Harry realize he was a Horcrux?
After witnessing Nagini kill Severus Snape, Harry collected a string of memories from the dying man. During a one hour ceasefire, Harry discovered that he was an unintended Horcrux from Snape's memories. In order to destroy Voldemort, he had to allow the Dark Lord to kill him.
Voldemort intentionally made six Horcruxes, but when he used Avada Kedavra on Harry, he unintentionally created a seventh Horcrux. Instead of dying, Lily's love for Harry created a counter 'curse' known as Sacrificial Protection and saved Harry.
While most fans agree that Harry is the unrefuted Chosen One, the final Deathly Hallows film (in particular) sways heavily toward highlighting a heroic Neville, revitalizing the debate regarding which boy is better suited for the iconic title. "The one with the power to vanquish the Dark Lord approaches ...
The only reason why it was Harry is that Voldemort thought he was the child the prophecy was talking about. By targeting him and trying to kill him, Voldemort marked him as his equal, while Neville got to live his life without that burden (though that doesn't mean he had an easy life).
Family. Snape's family background is mostly shown in flashbacks during the course of the last three novels. Snape was born to Eileen Prince, a witch, and Tobias Snape, a Muggle, making him a half-blood (hence the name, "Half-Blood Prince").
IT was when Harry and Hermione were on their own without Ron, and were hunting for the Horcruxes, its when Harry used to wake up with terrible headaches in themiddles of the night screaming sometimes. Hermione's research into Horcruxes at that time concluded Harry was Voldermot's Horcrux.
Dumbledore knew about Horcruxes. He knew how they were formed, what happened after that, etc. He probably got to know Harry was a Horcrux when he saw the Scar on Harry's forehead, but maybe he wasn't sure.
Being a horcrux simply means that Harry had a piece of Voldermort's soul inside of him. That would not grant him immortality. Harry Potter after this part he is no longer a Horcrux, Voldemort destroyed his part of the soul that resided in the boy.
Why didn't Dumbledore tell Harry how to destroy Horcruxes?
Dumbledore Never Really Had Time To Explain How To Destroy The Horcruxes. As much as Harry would have benefited from Dumbledore's knowledge of how to destroy the remaining five horcruxes, there was simply not enough time before his death to do so.
Voldemort intended Draco to die in the attempt to kill Dumbledore so that Lucius would be punished for his failure to retrieve the prophecy from the Ministry of Magic.
Neville is a pure-blood wizard born to Frank and Alice Longbottom, who were prominent Aurors and also members of the Order of the Phoenix during the first war against Lord Voldemort.
He actually asked the Sorting Hat to place him in Hufflepuff, as he was intimidated by Gryffindor's reputation for bravery, but the Sorting Hat didn't agree. They debated it for so long, that he was close to being what is known as a Hatstall, which is a term for any student whose Sorting takes longer than five minutes.
What would have happened if Voldemort chose Neville?
It was answered very eloquently by commenter Sooooo, who explained that we'd have a dead Neville on our hands: The key part of what saved Harry from Voldemort was Lily being given a choice by Voldemort (at Snape's request) to stand aside. Alice Longbottom would not have been afforded the same opportunity.
In Harry Potter and the Deathly Hallows Part 2, Neville is actually the person who destroys Voldemort's last Horcrux in Nagini, rendering him mortal, meaning that he and Harry truly delivered the final blows to Voldemort.
One of the three Unforgivable Curses outlawed under wizarding law, Avada Kedavra kills the victim on impact, instantaneously and painlessly, usually with a blinding flash of green light. There is no way to block the spell, and there is no counter-curse - it can only be dodged.
On confirming Draco's very much alive status, she plainly lied that Harry Potter was "dead". This action of hers was both very crucial and important, not only for Harry's survival but for Voldemort's final defeat as well, thus ensuring Harry was again protected by a mother's love, although indirectly.
Despite its legendary reputation and immense ability, the Elder Wand was an unassuming object. Appearing at face value to be a wand like any other, it had a smooth, unadorned shaft and a handle formed from two conjoined spheres. The Elder Wand gave its loyalty to whoever could win it from its previous master.
