It could be really interesting. Maybe Harry would grow up with the values and knowledge directly from the founders. He might be trained in magic in a more traditional and pure way, like how the founders would have taught. For example, he could learn advanced spells earlier and have a deeper understanding of Hogwarts' history and secrets from the start.
Well, if Harry Potter was raised by the founders in fanfiction, he'd likely have a very different personality. For example, Godric Gryffindor might instill in him even more courage and a sense of adventure right from his childhood. And Salazar Slytherin could teach him some of the more complex and perhaps a bit darker aspects of magic in a more positive light, as long as they are used for good. He'd also have a unique connection to Hogwarts, almost like he's part of the very essence of the school.
In such a fanfiction, Harry would likely grow up with a deep understanding of Hogwarts' original values. He might be trained in magic in ways that are more in line with the founders' intentions. For example, he could be taught advanced magic from a very young age, as the founders were extremely powerful wizards.
Obviously, Harry Potter himself. Then there would be the four founders: Godric Gryffindor, Salazar Slytherin, Rowena Ravenclaw, and Helga Hufflepuff. They could be present in some form, either as ghosts or through memories guiding Harry. Dumbledore might also still play a role, perhaps as a sort of mediator between the modern world and the founders' teachings that Harry is receiving.
If Harry was raised by the founders in fanfiction, his relationship with his enemies would also change. Voldemort might see him as an even greater threat because of the knowledge and power he gained from the founders. And Harry might not have the same relationship with Dumbledore. He would be more independent and rely more on the teachings of the founders rather than Dumbledore's guidance.
The story in 'harry is raised by the founders fanfiction' would likely be full of references to the early days of Hogwarts. Harry would probably have access to knowledge and magic that others don't. He might be taught by the ghosts of the founders or through ancient magic artifacts left behind by them. His upbringing would shape him into a wizard who is not only powerful but also has a unique perspective on the wizarding community. He could be a bridge between the modern wizarding world and the ancient traditions established by the founders, bringing about changes or revelations within the Hogwarts community based on the long - forgotten wisdom of the founders.
It could be Harry Potter himself. Since he has so many special qualities and a deep connection to Hogwarts, he might be revealed as an heir. Maybe he has some latent powers related to one of the founders that haven't been discovered yet.
One possible plot twist could be that the founders' different teaching styles clash when raising Harry. For example, Salazar Slytherin might be more strict about pure - blood heritage, while Helga Hufflepuff would focus on his kindness. This could lead to internal conflicts within Harry as he tries to balance their different expectations.
His magical abilities would likely develop at a much faster rate. The founders are extremely powerful and knowledgeable. They could guide Harry to discover and master magic that most wizards his age wouldn't even know exists.
Without more context, it's impossible to say who exactly these founders are. They could be founders of a small online Harry Potter fan community, or perhaps founders of a local Harry Potter reading group that also dabbles in fanfiction.