It's popular because it adds a new layer of drama. The war is over, but the problems don't end. It shows that even in victory, there can be backstabbing. People like to explore the darker side of human nature in the context of the Potter universe.
Well, it gives a chance to rewrite the story in a more gritty way. In the original, the victory seems so final. But in fanfiction, when Potter is betrayed after war, it creates a sense of realism. People know that in real life, things don't always end well even after a big victory. Also, it allows for different character developments. Potter can become more cynical, or he can rise above the betrayal in a more heroic way than before, and this is very appealing to readers.
The theme is popular because it challenges the idea of a happily - ever - after. Fans are interested in seeing how the characters they love would handle such a difficult situation. Potter being betrayed makes for a complex and engaging storyline. It also allows for a deeper exploration of the wizarding world's politics and power struggles in the post - war era. After the war, there are new power dynamics, and Potter is in a vulnerable position which can be exploited by others, and this is fascinating to explore in fanfiction.
It adds drama. Fans like to see their favorite hero in difficult situations. When Spider Man is betrayed, it creates a lot of emotional turmoil and makes the story more engaging.
There's a fanfic called 'False Alliances'. After the war, Potter discovers that some of the people he worked with during the war had ulterior motives. They betray him to gain control over certain dark magic artifacts that Potter was protecting. It shows how the after - effects of war can create a climate of mistrust and betrayal.
It might be popular because it allows fans to take control of the story. In the official Harry Potter stories, there are set relationships and storylines. But in fanfiction, especially this type, fans can create their own scenarios where they can make the characters face unexpected and difficult situations like betrayal within a harem - like setting. This gives a sense of novelty and freedom to the fans who want to explore the Harry Potter world in a different way.
One possible plotline could be that some of the former Death Eaters who were pardoned as part of the post - war reconciliation secretly plot against Harry. They might spread false rumors about him misusing his power or being a threat to the wizarding world again. Another could be that some of his own friends turn on him out of jealousy. Maybe they feel overshadowed by Harry's continued fame and hero status and start to believe the lies being spread about him.
It could be Ron. Maybe he starts to feel that Harry has changed too much after the war and is no longer the friend he once knew. He might be influenced by outside forces or his own insecurities. Another possibility is Hermione. If she gets too involved in the new Ministry politics and starts to believe that Harry's actions are not in line with the new wizarding order, she could turn on him.
The contrast between Draco and Harry is another reason. Harry is the hero, always in the spotlight, and Draco is from a different world. When Draco becomes protective, it's a sort of reversal. It creates a lot of potential for drama and romance. For example, in many fanfictions, Draco has to go against his family's values to protect Harry, which adds a whole new layer to the story.
It's popular because fans love Percy and Annabeth's relationship. After the giant war, there's a lot of room for exploring how they move forward. Their relationship has been through so much during the war, and seeing it develop further in fanfiction is appealing.
These fanfictions are popular because they tap into the universal theme of betrayal. In the case of Fem Harry Potter, it's a beloved character put in a difficult situation. The betrayal can be used to explore complex relationships, such as friendships and loyalties. It also allows for a deeper exploration of the wizarding world's politics and power dynamics. For example, if she is betrayed by the Ministry of Magic, it can show the corrupt side of the magical government. This kind of storytelling makes readers think and feel more deeply, thus attracting a large audience.
They're popular because it's a twist on the normal Harry Potter story. People like seeing the hero in a different situation, like being betrayed. It adds drama.
Another possible betrayer could be Dumbledore in some darker fanfictions. He might have a hidden agenda all along. He could be using Harry as a pawn in a much larger and more sinister game. And when Harry starts to figure things out and goes against Dumbledore's plans, Dumbledore betrays him to keep his own plans on track.