Well, obviously Harry would be the main character. Since he's the heir of the founders in this fanfiction.
There could be some new characters as well, perhaps descendants of the founders' original followers. These characters could either be allies or antagonists to Harry. They might have their own agendas related to the power and legacy that Harry represents as the heir of the founders.
Obviously, Harry is one of the main characters. There might also be his friends like Ron and Hermione. Since it's about being a founders heir, perhaps there will be appearances from the ghosts of the founders or characters who are descendants of the founders' friends or foes.
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.
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.
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.
In most 'Hermione founders heir fanfiction', Hermione is the main focus. However, other important characters include the other Hogwarts founders in a sort of spectral or legacy - based way. Harry and Ron are usually there as well, since they are an important part of Hermione's life. Sometimes, new characters are introduced who are related to the founders' history or the mystery of the heirship. And, of course, there are the professors at Hogwarts, like McGonagall, who can be involved in the story as they have knowledge of Hogwarts' traditions.
The heir of the founders in fanfiction could also be a character who is fated to bring back the original values of Hogwarts. Maybe in a story where the school has strayed from its roots, this heir emerges with the power to restore the balance between the four houses and the overall spirit of the school as it was intended by the founders.
The Death Eaters could still be antagonists. Even if Harry is the heir of the four founders, Voldemort and his followers would not want him to gain more power. They would try to undermine Harry's new - found status and use it to their advantage, perhaps by spreading false rumors about him among the wizarding community.
There's a possibility that it could be a new character introduced in the fanfiction. This character might have been orphaned and raised in a muggle family, not knowing their true heritage. But as they start at Hogwarts, strange things start to happen and it's revealed that they are the heir to one of the founders. It could also be an existing character like Neville Longbottom. He has shown great courage and loyalty, and there could be a backstory written where he is actually related to one of the founders through a long - forgotten branch of the family.
Heram is likely the main character in this fanfiction. He's the one who is said to be the heir of the founders. Beyond that, we don't really know much from just the title. He could be a new student at Hogwarts, or perhaps someone who has been there all along but only recently discovers his special connection to the founders.
Some pure - blood supremacists could also be antagonists. They may see Harry and Hermione, especially if Hermione is an heir as a Muggle - born, as a threat to their idea of a pure - blood - only wizarding society. They would do whatever it takes to stop them from rising to power and using the founders' legacy to promote equality and change in the wizarding world.