He might have a different view of magic. Growing up as Voldemort's son, he could be exposed to darker magic earlier. But instead of being corrupted by it, he could try to understand it in order to defeat it from within. This would give him a more nuanced understanding of magic compared to the original Harry Potter who was more on the side of 'light' magic from the start.
Harry would likely be more isolated. Other wizards might fear him or be suspicious of him. His relationships with friends like Ron and Hermione would be strained as they too would have doubts. But this isolation could also make him stronger and more self - reliant in some ways. He'd have to really dig deep to find his true identity, separate from the shadow of his father.
He would probably be more conflicted. His moral compass would be constantly tested. He might have a natural inclination towards power, like his father, but also have the good heart he developed growing up. So he'd be constantly fighting within himself.
Yes, there are some fanfictions with this rather interesting and out - of - the - box concept. It often involves creative reinterpretations of the Harry Potter universe's lore, magic, and character relationships. Writers might explore how Harry's nature would be different if he were related to Voldemort in such a way. It also could lead to unique plotlines about his place in the wizarding world and his fight against the Dark Arts, as his connection to the main antagonist would be completely redefined.
The self - insert could change Tom Riddle's fate by showing him true friendship. In the original story, Tom Riddle was a lonely boy who turned to dark magic. If the self - insert befriends him and is always there for him, it might make him less likely to seek power through dark means.
He would probably be more otherworldly. Harry might have an air of mystery around him that the original Harry didn't have. His actions could be more guided by a sense of divine purpose.
He would likely become more conflicted. Harry, who was always on the side of good, would now have to deal with this dark lineage. He might be more withdrawn as he tries to come to terms with it.
He would probably be more in tune with nature. Instead of just having a connection to Hedwig, he might be able to communicate with all kinds of animals. So he could be more of a naturalist wizard.
He would likely be more conflicted. Harry was always a morally upright character, but with Thanos as his father, he'd have to battle inner demons. He might be more powerful physically and have a darker side to his personality that he constantly has to keep in check.
He would be much more physically powerful. Instead of relying just on magic, he could use his Saiyan strength to solve problems. For instance, he might be able to break through magically locked doors with his bare hands.
At first, they might be like brothers, sharing everything and having a lot of fun while learning magic. But as they grow older, Tom's natural ambition might start to create some friction. If he feels overshadowed by Harry in any way, it could lead to jealousy. However, if they communicate well, they could overcome these issues and their relationship could evolve into a strong partnership, each complementing the other's skills.
The original plot would be drastically changed. In the original, Voldemort is Harry's archenemy. But here, with Tom Riddle being good and raising Harry, the whole dynamic of the 'chosen one' vs the dark lord is gone. Harry would grow up with a very different set of values and skills, probably learning magic in a more nuanced way from Tom. Also, the relationships with other characters like Hermione and Ron would be altered. They might not become friends in the same way, as Harry's upbringing would shape his personality and social interactions differently.
His character would likely be more calculating and less trusting. Growing up with Riddle, Harry would be exposed to a world of manipulation and power - seeking. He might not value friendship as much as in the original story.