In the original Harry Potter story, Harry is a wizard, not a vampire. So right off the bat, the whole magical essence of his character changes in the fanfic. His powers would be based on vampire abilities rather than wizardry. Also, his relationships would be different. For instance, his connection with Hermione and Ron might not exist in the same way as they are part of the wizarding world, while in the fanfic he'd be more involved with vampire - related characters.
The 'Harry is a dominant vampire' fanfic greatly deviates from the original. Firstly, the setting. The original has Hogwarts and the wizarding world, but the fanfic would likely be set in a more vampiric environment, like a hidden vampire lair or a gothic city. Harry's personality also changes. Instead of the sometimes - unsure boy in the original, he is now dominant. His goals and motivations would shift from things like defeating Voldemort to perhaps ruling the vampire world or maintaining his dominance within it.
The original Harry Potter story is about good versus evil, with Harry on the side of good. In the 'harry is a murderer fanfic', this fundamental aspect is turned upside down. Harry's actions in the fanfic would likely have a domino effect on other characters and storylines. For instance, his friends in the original story who support him would now be in a completely different position. They might have to oppose him, which is a radical departure from their original relationships.
Well, in the original 'Harry Potter' series, Dumbledore is like a guiding light for Harry. He helps Harry understand his destiny, the magic world, and how to fight Voldemort. However, in this fanfic, if Harry shoots Dumbledore, it not only destroys that relationship but also the overall tone of the story. The original story has a certain moral compass, and this fanfic seems to go in a different direction. It might introduce new and darker elements that are not present in the original, such as a different kind of magic or a hidden side of Harry that was never hinted at before.
Another way it deviates is in the relationships. In the original, relationships are mainly about friendship, mentorship, and the battle between good and evil. In the diaper fanfic, relationships might be more about caregiving, like who takes care of the diaper - wearing characters, and how they interact in this new, more domestic - like situation.
The original story builds on family love and loyalty. Lily's sacrifice is a cornerstone of the story. However, in the 'harry hates lily' fanfic, this concept is thrown out the window. It changes the way we view the Potter family relationships and the overall moral fabric of the wizarding world as presented in the original books.
The original Harry Potter story is about hope and friendship. However, the 'harry kills himself fanfic' goes against this theme. It's a huge deviation as it takes away the positive elements that are so central to the original, like Harry's determination to defeat Voldemort and protect his loved ones.
The original Harry Potter story has a strong family - love - centered theme. Harry's parents' love for him was so strong that it protected him even after their death. In the 'Harry Potter hates his parents' fanfic, this central theme is completely changed. It's a deviation that changes the whole dynamic of the relationships in the story. It's like changing the core of a flower, everything else about the story will be affected, such as Harry's relationship with his friends who also respected his parents.
In the original series, Harry doesn't kill Umbridge. So this fanfic takes a very different turn right there. In the original, Umbridge is eventually removed from Hogwarts in a more traditional way, through the combined efforts of the students and the return of Dumbledore. But in the fanfic, Harry taking her life is a huge deviation from the non - violent and more rule - abiding nature of the main character in the original series.
The original Harry Potter series is mainly about magic, friendship, and the fight against evil. The 'Harry Potter Chasity Belt' fanfic clearly deviates as it focuses on an object that is not part of the normal magical items in the series. It brings in a concept that is more related to Muggle ideas about chastity and protection in a very different way.
It deviates mainly in terms of the ethical and social structure. The original story doesn't have a slavery system. In these fanfictions, it creates a whole new set of relationships and conflicts that are based on the slavery concept, which is a huge departure from the relatively more egalitarian world presented in the original.
In the original story, Harry and the Weasleys are like family, and Hermione is also very close to them. So in the fanfic, the hatred is a huge deviation. It goes against the established relationships of friendship and family that are central to the original plot.