Well, surely Harry Potter would be one of the main characters. Since it's in the title that he's the heir of Uchiha, he's bound to be central to the story. And there might be characters from the Uchiha clan as well, like Sasuke or Itachi. They could play important roles in helping Harry understand his new connection to the Uchiha. Also, we can't forget his friends from Hogwarts like Ron and Hermione. They would probably be involved too, either helping Harry deal with this new situation or being a bit confused by it.
The main character could be someone who was accidentally transported from the Naruto universe to the Harry Potter world as a baby. Growing up in Hogwarts, they have no idea about their Uchiha heritage until certain events start to trigger memories or abilities. They would be a unique character, having the innocence of a Hogwarts student but also the latent power of an Uchiha. Their friends at Hogwarts would help them uncover their true identity, and they would have to learn how to use their Uchiha powers in a world that is completely new to them.
It's hard to say exactly what it's about without reading it, but generally, it's likely to be a story that fuses the two very different universes. It might be that Harry Potter is the heir to the Uchiha name in a world where the two stories collide. There could be a whole new set of adventures for Harry, where he has to deal with things like the Cursed Seal which is related to the Uchiha's power, and also his normal Hogwarts life with classes like Potions and Transfiguration. It could be a really exciting read for fans of both series.
There could be other characters from the original Harry Potter series who play important roles. For example, Hermione might be there to help Harry research and understand his Pendragon heritage. Ron could also be by his side, providing support and comic relief in the face of all the new and strange things that come with this discovery.
In this fanfiction, Harry Potter is probably the central figure as it seems related to his new identity as the Heir of Death. However, other characters like Dumbledore could play significant roles. Dumbledore might be guiding Harry through this new discovery, or perhaps he's been hiding some secrets about the Heir of Death all along. Additionally, we may see characters from the dark side, like Voldemort or his followers, being involved in the story, either trying to stop the heir or use their power for evil.
In this fanfiction, the main characters could be quite diverse. Since it's about a 'dark heir', there would likely be a character who embodies this role. It could be a previously unheard - of character with a complex backstory related to a dark legacy. Harry Potter might be involved to oppose this dark heir or to try and understand their motives. His friends, like Hermione and Ron, could also be part of the story. Additionally, there could be other magical beings or characters from the 'Harry Potter' lore, such as members of the Order of the Phoenix or Death Eaters, who are drawn into the plot due to the emergence of the dark heir.
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.
Typically, the main character would be the heir of Avalon. They are often a new character inserted into the Harry Potter universe. But of course, Harry Potter, Hermione, and Ron usually also play important roles as they interact with the heir of Avalon, either as friends, allies, or sometimes even as rivals.
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.
The main character is the 'Heir of Darkness', who has a complex personality and backstory. Harry Potter would be a main character as he is often at the center of any major events in the Harry Potter universe. Additionally, there could be antagonists in the fanfiction related to the dark side that the heir might be associated with. For example, a group of dark wizards who want to use the heir for their own evil purposes. And the fanfiction might also introduce some minor characters from the original series in new roles, like Luna Lovegood providing some unique insights about the heir's situation.
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.