There's 'Harry's Hidden Horcrux'. This fanfic could show Harry creating a Horcrux during a time of great emotional turmoil. Maybe he's trying to preserve a part of himself that he feels is being lost in the fight against Voldemort. It would likely delve into the dark magic aspects and how it changes Harry.
One popular 'Harry absorbs Horcrux' fanfiction might be 'The Horcrux Within'. It delves into how Harry's character changes as he absorbs the Horcrux. The story explores his internal struggles and how it affects his relationships with his friends at Hogwarts. Another could be 'Absorbing the Darkness' which focuses on the magical implications of such an event. It shows how Harry has to learn to control the new power within him that comes with the absorbed Horcrux.
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.
Perhaps his father's old wand. It has a connection to his family and his heritage. Since it's a wand, it already has a certain amount of magical energy, so it could potentially be a suitable vessel for a Horcrux. And it would be a very interesting twist on the concept of a Horcrux as wands are not a typical choice.
One interesting Harry and Hermione Horcrux fanfiction could be 'The Horcrux Hunt'. In this fic, Harry and Hermione embark on a dangerous journey to find and destroy all the Horcruxes together. Their friendship deepens as they face numerous challenges along the way.
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.
Often, it starts with a setup that leads Harry to consider creating a Horcrux. For example, a situation where he believes it's the only way to defeat Voldemort once and for all. Then, the middle part would show the process of creating the Horcrux, which could be filled with dark and complex magic. Finally, the end would deal with the consequences, like how his friends react, or if it changes his relationship with the magical world.
Well, a major aspect is the impact on the overall story arc. In these fanfictions, the fight against Voldemort takes on a whole new meaning. Harry being a Horcrux means that his very existence is intertwined with Voldemort's. There's also the element of secrecy and revelation. How and when the other characters find out about Harry being a Horcrux can be a crucial part of the plot. And, of course, there's the magical mechanics of what it means to be a Horcrux. How does it affect Harry's magic? How can it be destroyed without killing Harry? These are all things that are often explored.
They're interesting because it's a unique twist on the original Harry Potter story. It adds a whole new layer of complexity to Harry's character. Instead of just fighting against Horcruxes, he has to deal with being a part of that dark magic in a way.
One interesting plot twist could be that Draco has some hidden knowledge about the Horcruxes from his family's dark secrets. Maybe his mother had unknowingly passed on some crucial information to him that helps Harry and him in a very unexpected way during the hunt.
Well, there's 'Harry and the Horcrux Legacy'. In this fanfiction, Harry not only has to deal with the existing Horcruxes but also some new threats related to the Horcrux magic. It's really engaging as it combines the familiar elements of the Horcrux concept from the books with new adventures for Harry. There's also 'Horcrux Redemption' which has an interesting take on how the Horcruxes could potentially be redeemed rather than just destroyed.