Well, in a fanfiction, anything can be made possible. Maybe it could be a situation where Voldemort has a change of heart due to some powerful magic that alters his very nature. And Harry, being the forgiving person he is, sees a new side of Voldemort and they develop an unlikely bond that over time turns into love. However, this goes completely against the canon where they are bitter enemies.
In fanfiction, anything can be possible. It could be due to some dark magic or a convoluted plot twist. Maybe a spell was cast long ago that altered Hermione's true parentage, or Voldemort could have used some form of mind control on her real parents to make them believe she was theirs when in fact she was his. However, this goes completely against the original lore of the series.
Well, in fanfiction, the author has the liberty to play with the lore. There could be a scenario where a powerful dark magic spell in the past had some unforeseen consequences. This spell could have somehow intertwined the bloodlines of Voldemort and Hermione's family. Maybe a curse was placed on a family that later branched out to both Voldemort and Hermione's ancestors, creating this strange connection.
Well, in fanfiction, some authors might come up with the idea that there was some hidden connection or a secret affair in the past. Perhaps Voldemort had a relationship with Hermione's mother before he fully embraced the dark side. This would completely change the dynamics of Hermione's character and her place in the wizarding world. It could lead to her having to deal with the stigma of being related to the most evil wizard ever while still trying to uphold her values.
Well, in fanfiction, the idea of Hermione being Voldemort's niece might stem from some sort of magical tampering with family lines in the past. It could be that a powerful spell was cast long ago that altered the relationships in a way that made Hermione related to Voldemort. Or it could be a completely different take on the lore where the wizarding world has a whole other layer of hidden family connections that JK Rowling didn't explore in the original series.
Well, in a fanfiction world, anything can happen. Maybe a magical spell goes wrong and somehow creates a connection between the wizarding world of Harry Potter and the superhero universe of Ms Marvel. It could be a really interesting crossover, with Harry's magic and Ms Marvel's powers creating a unique dynamic.
Well, one way could be through some dark and misinterpreted magic. Maybe Harry stumbles upon an ancient spell that he thinks will defeat Voldemort once and for all but instead, it backfires and revives him. It could also be due to some sort of interference from a powerful dark object that Harry unknowingly uses in the wrong way.
In the original Harry Potter series, Harry would never kill Dumbledore as they had a strong bond. However, in fanfiction, the author might rewrite the story by having Harry be under the influence of a powerful dark magic or a powerful mind - controlling spell that forces him to do so. Another possibility could be a huge misunderstanding where Harry thinks Dumbledore has turned evil and poses a great threat to Hogwarts and the wizarding world.
One possible plotline could be a magical accident that causes Harry to be magically bound to Voldemort in a way that he has to 'ride' him, like being attached to his back or something. This could lead to a situation where Harry has to endure Voldemort's actions while trying to find a way to break free. And during this time, he might gain some insights into Voldemort's thoughts and plans, which he could later use against him.
In fanfiction, the rules can be bent. It might be due to some new magical potion or artifact that had an unforeseen effect on Fem Harry Potter. Writers often take creative liberties to come up with unique and sometimes out - of - the - box scenarios like this one.
Perhaps in a world where the prophecy was misinterpreted. The original prophecy that linked Harry and Voldemort could have been misread. In this fanfiction, they discover that they were never truly enemies in the way they thought. Instead, they were meant to work together to bring balance to the wizarding world. Harry, with his compassion, would be more open to this idea, and Voldemort, seeing an opportunity for a different kind of power, would join forces with him.