Well, it could also be Harry who is wrongly thought to be cheating on his partner. In the fanfiction, perhaps some false rumors are spread by his enemies. They create a situation where his friends start to doubt him, and his relationship is put under great strain.
In the 'naruto is cheated on by hinata fanfiction', it could be that Hinata's own insecurities play a part. She might feel that Naruto is too focused on his ninja duties and not enough on their relationship. So, she could start getting closer to someone who seems to give her more attention. This new connection could be misconstrued as cheating, when in reality she's just seeking emotional support. However, Naruto, seeing her with this other person, would think she's being unfaithful.
Perhaps in the fanfiction, Harry Potter's death occurs because he tries to rewrite a powerful magic spell that goes horribly wrong. He was always known for his bravery and willingness to take risks in the original series, so this could be an extension of that. His death would then be a tragic consequence of his own curiosity and desire to push the boundaries of magic.
One possible scenario could be that Harry is exiled due to false accusations of dark magic. Maybe the Ministry of Magic, fearing his power after the defeat of Voldemort, spreads lies about him being a threat. Another could be that he chooses exile to protect his friends from a new, unknown danger that is targeting him specifically.
Well, one scenario could be that Harry meets a very strict tutor who specializes in Defense Against the Dark Arts. This tutor might push Harry to learn advanced spells and techniques right from the start. Another could be that he gets a tutor for Potions who has a really unique way of teaching, like using rare ingredients found only in Diagon Alley's hidden corners. Maybe the tutor is an old wizard who has a vast knowledge of magical potions and their history.
One possible scenario could be that new evidence is found to prove Harry's innocence. Maybe a powerful magical object reveals the truth about what really happened, leading to his release.
One possible scenario could be that Harry discovers some long - hidden secrets about Dumbledore that he feels were used to manipulate him. So, he might expose these secrets to the wizarding world, ruining Dumbledore's once - sterling reputation. Another could be that Harry uses his own skills and the support of his friends to undermine Dumbledore - related policies or institutions in Hogwarts that he believes were unfair.
In some fanfictions, Harry might use his magic skills in a creative way to embarrass Umbridge. For example, he could make her signature pink outfits turn into ridiculous colors every time she tries to be authoritative. Another scenario could be that Harry reveals some of Umbridge's darkest secrets in front of the whole school, which would surely be a form of revenge as she values her reputation so much.
One interesting scenario could be that the removal process involves a unique magical spell that only Harry, with his special connection to Voldemort, can perform. This spell might require him to draw on his deepest reserves of courage and love for his friends.
One possible plot could be that Issei discovers his partner cheating through finding love letters or messages from the other person. He then goes through a phase of heartbreak and self - doubt, questioning what he did wrong.
One possible plot could be Deku finding out his partner cheating through overhearing a conversation. He might be heartbroken and initially go into denial.