In the original 'Harry Potter' series, the relationship between Harry and Snape was one of mutual dislike but also a certain level of respect in the end. However, in this fanfiction, it's a complete break. The fanfiction might change the power dynamics at Hogwarts as well. Snape was a key figure in the school's hierarchy, and his death at Harry's hands would send shockwaves through the staff and students, unlike anything in the original story where his death was a heroic sacrifice.
The original Harry Potter story focuses on Harry's battles against Voldemort and his growth as a wizard. The fanfiction about Harry refusing to marry Snape takes a different turn into the realm of romantic relationships which were not central in the original. Also, in the original, the relationships are more along the lines of friendship, mentorship, and enmity, not romantic love between these two characters.
The original Harry Potter series is about friendship, love, and the fight against evil. Harry is portrayed as a hero who would never harm his loved ones. However, in this fanfiction, the very foundation of Harry's character is shaken. It also changes the overall tone of the story. Instead of a story of hope and heroism, it becomes a dark and tragic tale that subverts the expectations set by the original series.
The original Harry Potter series promotes forgiveness and the power of love. Harry is shown to be a kind - hearted character who believes in the good in people. But in the 'harry kills the dursleys fanfiction', it goes against this. It shows a more vengeful and darker side of Harry that is not in line with his character in the books. It also changes the family dynamic aspect which is an important part of the original story.
In the original Harry Potter storyline, Dumbledore is seen as a wise and benevolent figure who is always looking out for Harry's best interests. However, in the 'harry hates dunbledore fanfiction', this perception is changed. It might show Dumbledore in a more negative light, perhaps making him seem more self - serving or having ulterior motives, which is a huge departure from the original where he is a symbol of good and guidance.
It probably deviates in terms of character portrayal. In the original, Snape has a very complex and mostly antagonistic relationship with Harry. But this fanfiction with its 'daddy Snape' concept might make the relationship more personal or family - like in a very different way than the books or movies.
The original series is all about Harry's fight against evil and his will to survive. But in this fanfiction, it goes against that completely. Harry is a symbol of hope in the original, and him killing himself is a huge departure from his character's core values.
The original Harry Potter series is based on themes of love, friendship, and the co - existence of wizards and Muggles. In the 'Harry Potter kills Muggles' fanfiction, it completely goes against this by having Harry, who is a symbol of good in the original, become a murderer of Muggles. This is a huge deviation from the core values of the series.
It deviates mainly in the character identities. In the original, Harry and Hermione are just normal students with their own roles. But in this fanfiction, becoming Remus' pups gives them a completely different identity. They might have new powers or behaviors that are not in the original. For example, they could have enhanced senses as pups.
In the original storyline, Harry and Ginny get married. So in this fanfiction, it's a complete divergence. It might change the whole future of the characters. For example, the Weasley family dynamics would be different without Ginny being Harry's wife. And Harry's own personal development and relationships with other characters would also take a different turn.
Well, in the original Harry Potter storyline, there is no such concept as mpreg involving Harry and Tom Riddle. So, immediately, it's a huge deviation in terms of the biological and relationship aspects. The fanfiction creates a whole new set of relationships and character dynamics that are not present in the source material.