In a large number of fanfictions, Harry is indeed made to be descended from the founders. This concept allows for a great deal of creativity. It could mean that he has an innate understanding of the magic that the founders were known for. Maybe he has a natural affinity for the secrets of Hogwarts if he's related to Helga Hufflepuff, or perhaps he has a more political influence within the wizarding world if his ancestry is linked to Rowena Ravenclaw. Fanfiction writers use this idea to expand on the existing Harry Potter universe in unique and exciting ways.
In fanfiction, Harry being descended from the founders has several implications. Firstly, it deepens his connection to Hogwarts. Instead of just being a student, he becomes part of the very fabric of the school's history. His relationship with the houses could change drastically. If he has founder - related ancestry, he might be able to influence the houses in ways that were not possible before. For instance, if he's related to Helga Hufflepuff, he could promote more unity among the houses. Secondly, it can affect his role in the wizarding world. He could be seen as a unifying figure, someone who bridges the gap between different magical traditions associated with the founders. This could lead to him being involved in more political or magical matters on a grander scale, and also give him a new perspective on the ongoing struggles in the wizarding world, such as the fight against pure - blood supremacy.
In the context of the Harry Potter universe, the founders are Godric Gryffindor, Salazar Slytherin, Rowena Ravenclaw and Helga Hufflepuff. In this fanfiction, it's likely these are the founders who are training Harry.
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.
I'm not sure specifically as there could be many different plots in such a fanfiction. It might involve the founders of Hogwarts (like Godric Gryffindor, Salazar Slytherin etc.) training Harry in magic skills, perhaps in areas that the regular Hogwarts curriculum doesn't cover fully, like advanced dueling techniques or ancient magic knowledge.
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.
Yes, in some fanfictions, Harry Potter is made out to be the heir to the founders. It's a creative twist on the original story that allows for new and exciting plot developments.
Neville Longbottom is another possible heir. He has a strong connection to Gryffindor through his family's long - standing association with the house. His growth from a shy and clumsy boy to a brave and powerful wizard could be part of a story where he is the heir of the founders. His ability to stand up to the Death Eaters in the final battle shows his hidden strength, which could be related to the founders' magic.
Harry Potter himself could be a likely candidate. He has shown many qualities that the founders would have admired, like his courage and loyalty. Also, he has a connection to the Sorting Hat which has knowledge of the founders' intentions. Another possibility could be Hermione. Her intelligence and thirst for knowledge are traits that could be associated with the founders. She could use her knowledge to uncover secrets related to the founders and their heirship.
One common theme is time - travel. Often, Harry and Hermione are sent back in time to interact with the founders. Another theme is the sharing of modern magic knowledge with the founders. For instance, they might introduce spells that were developed later. Also, the theme of changing the course of Hogwarts' history is quite common, like influencing the house system or the way magic is taught at Hogwarts.
There could be a 'harry founders fanfiction' where Harry discovers long - lost artifacts related to the founders. These artifacts hold the key to some great mystery at Hogwarts. Maybe they are linked to a hidden chamber that has powers beyond anyone's imagination. Harry then has to team up with the ghosts of the founders to solve the mystery and protect Hogwarts from an ancient evil.