Well, perhaps in this fanfic, Harry could be wrongly accused of a serious crime like dark magic use. Everyone, including his friends Hermione and Ron, might turn their backs on him due to false evidence. He would then have to fight alone to clear his name and find out who really framed him.
The Ministry of Magic itself could be the main antagonist. They might be so afraid of Harry's growing power and influence that they create false evidence to make everyone believe he has betrayed the wizarding world. They try to control the situation by turning everyone against Harry.
In some cases, it could be an ancient and evil magical being that has been awakened. This being has the ability to manipulate people's minds and convinces everyone that Harry is evil. It wants to isolate Harry before attacking him directly for some unknown but dark reason.
One possible plot could be that everyone believes false rumors about Harry being a dark wizard. His friends from Hogwarts, including Ron and Hermione, turn their backs on him. Harry then has to find a way to prove his innocence all alone, perhaps by going into hiding and secretly investigating who spread the lies.
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.
Yes, there might be. Fanfiction platforms are filled with a vast variety of stories. You can start by checking major fanfic sites like Archive of Our Own or Fanfiction.net. Just search for the relevant keywords and you may find what you're looking for.
Well, it could be about Harry Potter experiencing a sense of betrayal within the context of the 'light' side in the wizarding world. Maybe the so - called good characters or forces that are supposed to represent the light, like the Order of the Phoenix or Dumbledore, do something that makes Harry feel let down or betrayed. It could involve secrets being kept from him that he later discovers and feels were a form of betrayal.
The idea of 'Harry Potter Betrayed' in 2018 fanfiction could also be related to a betrayal of Harry's ideals. Some new character or even an old one could act in a way that goes against what Harry stands for, such as using dark magic when Harry firmly believes in the power of love and light magic. This would not only be a personal betrayal for Harry but also a threat to the world he has been trying to protect.
Another possibility is that it could be a new character introduced in the fanfiction. This new character could be someone who gains Harry's trust quickly but then betrays him for personal gain or because they are secretly working for an enemy. For example, a new student at Hogwarts who seems friendly at first but is actually a spy for a dark wizard.
Another instance could be Hermione betraying Harry in fanfiction. Suppose she falls in love with someone who is against Harry, like a pure - blood supremacist in a different version of the wizarding world. Her love for this person makes her go against Harry, which is a huge betrayal considering their close friendship in the original story.