Dumbledore might also be a common character. He could serve as a guide or mentor to Harry in his new role as heir, providing wisdom and advice. Additionally, some fanfictions might include characters from the Potter family's past, like his parents James and Lily, who could appear in flashbacks or as some sort of spiritual guidance for Harry.
There could be antagonists too. Voldemort or his followers might still be a threat, or perhaps there are new villains who oppose Harry because of his heirship. These could be jealous wizards or dark creatures that see Harry's new status as a threat to their own plans in the wizarding world.
Well, of course, Harry Potter himself is a common character as the heir in these fanfictions. Hermione is often there too, helping Harry figure out the implications of his new status. Ron may also be present, providing support and some comic relief. Sometimes, characters like Dumbledore play a key role as well, guiding Harry through the revelations about his heritage.
The heir themselves would be a main character, of course. And Harry Potter might still play a role, either as a friend or a rival to the heir. Dumbledore could also be a major character, guiding or observing the heir's journey.
In 'Harry Potter Heir of Gaunt fanfiction', aside from the main characters like Harry, Voldemort, and Hermione, Neville Longbottom can sometimes play an important role. Given Neville's own connection to the wizarding world's history and his growth in the original series, he could be involved in helping or hindering the Heir of Gaunt. And of course, Dumbledore might appear as a guiding figure, using his wisdom to influence the actions of the Heir of Gaunt. There could also be a Gaunt family member who has survived and is either a help or a hindrance to the heir.
In some versions, there could be a love interest for the heir of God. This character could add another layer of complexity to the story, as the heir has to balance their relationship with their quest for knowledge about their identity and the use of their powers.
Obviously, Harry Potter would be one of the main characters. Since it's about him being the heir of Mordred. And there might be other characters from the original series like Hermione and Ron who could be involved in his journey of discovery regarding this new identity.
The heir of Camelot is surely a main character. They are the focus of the story as they navigate their dual identity. Then, there could be a wise old wizard or witch who acts as a mentor to the heir, guiding them in understanding their Camelot heritage. Additionally, there may be a group of students at Hogwarts who form a sort of fellowship with the heir, similar to the fellowship in the Arthurian legend. These students would play important roles in the heir's adventures and growth.
Well, of course, the heir of Morgana is likely to be a main character. They would be the focus as they navigate their new identity and the powers that come with it.
Since it's a fanfiction, it could vary greatly. But likely, it would include Harry Potter and his friends like Hermione and Ron as they are central to the original series. And of course, the new character who is the heir of Hayabusa would be a main character as well. There might also be some original characters created by the fanfiction author to support the story around the heir.
Since it's a fanfiction about the heir of Lefay in the Harry Potter universe, the main character is likely to be the heir themselves. They could be a new student at Hogwarts who starts to have strange dreams or experiences that lead them to discover their heritage as the heir of Lefay. Alongside this heir, there might be some of the traditional Harry Potter characters. For instance, Dumbledore could play a role in guiding the heir or protecting them from those who might want to harm them because of their special status.
Draco Malfoy is also quite popular. Since he is from Slytherin, he could be closely related to the Heir of Slytherin in some fanfictions. Maybe he has some inside knowledge or is even a suspect himself. His complex relationship with Harry could be further explored in this context.