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.
It could be about a time - travel plot. Maybe Harry goes back in time and realizes that in order to prevent a greater evil in the future, he has to work with Voldemort in the past.
In some fanfictions, Snape might be working with Voldemort because he has been blackmailed. Voldemort could have found out some deep, dark secret about Snape and is forcing him to cooperate. This could be related to Snape's past or something he has done that he doesn't want to be made public.
It's definitely possible. In such a fanfiction, it could start with a time - turner accident. Harry goes back in time and accidentally changes the course of Voldemort's life. They end up growing up together, sharing secrets and adventures. Harry could influence Voldemort to use his power for good, and in turn, Voldemort could teach Harry some advanced magic. This would create a bond of friendship between them.
In this kind of fanfiction, Harry and Voldemort might be forced to have intense conversations. They could start to understand each other's motives better. Maybe Harry tries to convince Voldemort to give up his dark ways.
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.
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.
There probably is. Fanfic communities are full of unique and unexpected plot ideas. This kind of plot would completely turn the original story on its head. It might involve some sort of alternate reality where Harry and Voldemort have a common goal or where they are forced to work together due to some external threat. It could be a really interesting read for those who like exploring different interpretations of the Harry Potter universe.
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.
Well, in this fanfiction, perhaps Voldemort adopts Harry because he realizes Harry has some unique power that he wants to control. As Harry grows up, he starts to understand Voldemort's motives and tries to find a way to break free. He could also form unexpected alliances with some of Voldemort's followers who have a change of heart.
One possible plot could be that Harry is somehow tricked into believing Voldemort's cause is just. Maybe Voldemort uses some powerful magic to distort Harry's perception of good and evil. So Harry starts to help Voldemort in his quest for power, thinking he is doing the right thing.