Another concept could be centered around the characters' reactions when they finally locate the seventh horcrux. There could be internal struggles among the characters, like Harry having doubts about whether destroying it is the right thing to do, considering it might hold some knowledge that could be useful against Voldemort.
One interesting concept is the idea of creating new Horcruxes. In some fanfictions, a character might attempt to create a Horcrux in a different way than Voldemort did, perhaps using a more unique object or spell. Another concept could be the destruction of Horcruxes in unexpected ways. For example, a fanfic might explore if a Horcrux could be destroyed by a powerful emotion rather than a specific magical weapon.
In many fanfictions, Neville Longbottom might also play a significant role. He has grown into a powerful wizard by this point in the story. His knowledge of Hogwarts and its secrets could be crucial in the search for the seventh horcrux. He could be the one who discovers a hidden passage that leads to the location of the horcrux.
One consequence could be that his connection to Voldemort becomes even stronger. This might lead to him being able to sense Voldemort's actions and thoughts more clearly, but also make him more vulnerable to Voldemort's attacks on his mind. Since the Horcrux is a part of Voldemort's soul, it could also start to influence Harry's personality, making him more aggressive or moody at times.
In some fanfictions, when Harry absorbs the Horcrux, it could lead to a moral dilemma within him. He has to struggle with the dark influence of the Horcrux while still trying to be the good wizard he is. This internal conflict can make for a really engaging story, with Harry constantly fighting his inner demons and trying to separate his own identity from that of Voldemort's.
One interesting scenario could be that the removal process involves a unique magical spell that only Harry, with his special connection to Voldemort, can perform. This spell might require him to draw on his deepest reserves of courage and love for his friends.
One interesting plot twist could be that the last Horcrux is not an object but a person no one suspected. For example, it could be a seemingly innocent bystander who has been under Voldemort's control all along without anyone realizing.
Yes, in some fanfiction, Harry Potter is considered a Horcrux. This concept adds an interesting twist to the original story, exploring different aspects of magic and the connection between Harry and Voldemort.
If Harry were to create a Horcrux in fanfiction, it would likely lead to a great corruption of his soul. Horcruxes are dark magic, and the act goes against all that Harry stands for in the original series. He might start to show signs of increased aggression, a detachment from his friends, and a growing attraction to the Dark Arts.
One interesting concept could be exploring more about the Marauders' time at Hogwarts. Fanfiction might expand on their adventures, like pranks they played that were never mentioned in the original book. Another could be different interpretations of Sirius Black's escape and his relationship with Harry during that time.
Some fanfictions in Harry Potter 2 might play with the idea of the basilisk having different powers or weaknesses. It could also explore the idea of a hidden connection between Ginny and the Chamber of Secrets that goes beyond what was in the original story. There might be fanfictions that change the role of certain characters, like making Neville a more central figure in solving the mystery of the Chamber.