Well, it changes it drastically. In the original, Harry is the hero against Voldemort. But in this fanfiction, the dynamic is completely different. Harry's abuse gives him a different background and the revelation of his relation to Voldemort makes him an outcast in a new way.
The overarching theme of good versus evil also gets a makeover. Instead of a clear - cut battle between Harry and Voldemort, it becomes a more nuanced struggle. Harry has to fight not only against Voldemort but also against the dark side within himself that he might inherit from his father. This makes the story more complex and less black - and - white compared to the original.
The relationships in the story are also transformed. For example, his friendships with Ron and Hermione. They might be more hesitant around him, or they might be even more determined to keep him on the right path. And the relationship with the Dursleys would take on a whole new meaning, as his abuse there could be seen as part of a bigger pattern related to his dark heritage.
At first, Dumbledore might see Harry as an even greater threat. But as he delves deeper, he could realize that Harry has the potential to be a powerful force for good, despite his dark lineage. So, Dumbledore would start to mentor Harry in a different way, focusing more on helping him come to terms with his identity and use it for positive change.
He becomes more conflicted. Knowing he's Voldemort's son, he's constantly in turmoil about his true nature. His confidence might waver as he wonders if he's capable of the same evil as his father.
If Harry Potter was Voldemort's son in fanfiction, it would completely change the story. Firstly, the relationship between Harry and Voldemort would be extremely complex. Instead of being arch - enemies, there would be a strange family bond. Harry might struggle with his identity more. He would have to deal with the fact that his father is the most evil wizard. The Hogwarts faculty might also treat him differently. They would be more suspicious of him and his motives, fearing that he might inherit Voldemort's evil ways. Also, his friends might have a hard time accepting this new truth about him.
His relationships with the other characters are also altered. Dumbledore, for example, had a big role in Harry's life in the original story. But if Harry is Grindelwald's son, Dumbledore's attitude towards him might be more complex. Dumbledore had a history with Grindelwald, and this new connection could make Dumbledore both more protective and more wary of Harry. The same goes for other characters like Snape. Their interactions with Harry would be colored by this new family connection.
It completely alters the family background. In the original, Harry was an orphan from the Potter family, but in this fanfiction, he's part of the Malfoy family. This changes his upbringing, values, and social status in the wizarding world.
The original story has a strong theme of self - sacrifice and heroism. In the fanfiction where they are related, this could be altered. Harry might struggle more with the idea of having a connection to Voldemort. It could add a layer of internal conflict, as he wonders if he has some of Voldemort's darker tendencies within him. This could change the theme from a straightforward battle of good against evil to a more complex exploration of nature vs. nurture. Harry has to decide whether his relation to Voldemort defines him or if he can rise above it and still be the hero we know from the original story.
The story would also shift in terms of Harry's place at Hogwarts. His sorting into Gryffindor might be more complex. Since he's related to the Black family, which has a history of being in Slytherin, there could be an internal struggle within Harry about his house loyalty. And his friends, like Ron and Hermione, might react differently to this new revelation about his parentage as they've always known him as a Potter.
Harry could become more powerful in a way that scares his friends. Voldemort's training might focus on the Dark Arts, which are powerful but dangerous. This could change Harry's magic style. He may become more solitary as his new skills and knowledge set him apart from his Hogwarts friends who follow a more traditional path of magic.
It changes it a great deal. Firstly, Harry's origin is completely different. Instead of being an orphan with a mysterious connection to Voldemort, he now has a connection to the Beyonder. This alters his self - discovery journey. He's no longer just finding out about his role in the wizarding world against Voldemort, but also about his otherworldly heritage.
Harry in this fanfiction is likely to be more ruthless. Voldemort's upbringing would make him less empathetic. He may value power above all else and be more willing to use dark magic to achieve his goals. His relationships would also be different. He wouldn't have the same close - knit group of friends as in the original story. Instead, he might be surrounded by Death Eaters or those who follow Voldemort's ideology.