How would the world of Harry Potter change if he was a demigod son of Anubis in fanfiction?

Yes, there are likely to be such fanfictions out there. Fanfiction is a vast and diverse world, and it's common for fans to create crossovers between different fictional universes like 'Harry Potter' and the world related to Anubis. You can try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own to find them.

The story could involve Harry using Anubis - related magic. Since Anubis is associated with mummification, Harry might be able to use spells that turn his enemies into mummies for a short time. Also, his connection to Anubis could give him an enhanced sense of justice, which would play out in his fight against the dark forces in the wizarding world. He may also discover ancient Egyptian spells that are more powerful than the normal wizarding spells he knows.

Well, perhaps there is a prophecy in the Harry Potter world that involves a demigod of Anubis. A young wizard or witch is then revealed to be this demigod. They are tasked with finding ancient Egyptian artifacts that have been lost in the wizarding world. Along the way, they face challenges from both the wizarding villains who want to use the artifacts for dark magic and the enemies from the world of Anubis who want to keep the artifacts hidden. As they search, they learn more about their dual heritage and how to control their combined powers.

His relationship with Hermione and Ron would be different. They might be a bit jealous at first of his new powers. But they would also be curious and try to help him understand his demigod side.

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.

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 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 He might be more withdrawn as he tries to come to terms with it.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 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.

The wizarding world would likely see a more adventurous Harry. He might introduce new concepts from Star Trek, like a sense of galactic exploration within the boundaries of the wizarding world. Maybe he'd try to find new magical places using a more scientific - like approach.