Perhaps in the 'harry is the heir of pendragon fanfiction', Harry's new status as the heir of Pendragon causes a stir in the wizarding world. Some might fear his new - found power, while others might see him as a great hope. He could be drawn into a political struggle within the magical community as a result.
One possible plot development could be that Harry has to face a lot more internal conflict. He would be associated with a house that his friends might view with suspicion. Also, he might discover new magical abilities or powers that are related to the Slytherin heritage.
Obviously, Harry himself is the central character. Then, there could be characters like Dumbledore who might play a role in guiding Harry about his new heritage. Hermione would also likely be involved, using her knowledge to help Harry understand the Pendragon history.
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.
One interesting plotline could be the discovery of the connection between being the heir of Pendragon and Harry's existing powers in the wizarding world. Maybe it gives him new abilities or a different perspective on magic.
The main characters could include the heir's family members from the Pendragon side, even if they are long - dead, they might appear in memories or visions. Dumbledore could also be a main character as he is a very important figure in the Harry Potter world. He might guide the heir, knowing about their special heritage and seeing how it could be beneficial in the fight against evil. Another possible main character could be a villain who wants to use the heir's power for their own dark purposes.
In some fanfictions, the heir of Arthur Pendragon could have a special connection to the magical creatures in the Harry Potter universe. Since Arthur was a great king, the heir might inherit his ability to communicate or form bonds with these creatures. This connection could be crucial in solving various mysteries in the wizarding world, like finding a hidden place where a powerful dark magic object is hidden. They could use the help of these creatures to outwit the villains who are also after the same object.
Well, one possible plot development could be that Harry learns some really unique combat skills from Scathach. Maybe he becomes a much more formidable wizard in dueling. Another could be that he gains a different perspective on magic through her teachings, which helps him in his battles against Voldemort.
One possible plot development could be that Voldemort fully regains his power without Harry as an obstacle. The wizarding world would be plunged into complete darkness. His friends, like Hermione and Ron, might go into a deep state of despair and then form a resistance group. They would try to find other ways to defeat Voldemort, perhaps by seeking out more powerful magical artifacts or uniting with some previously neutral magical creatures.
One possible plot development could be how the wizarding world reacts to the loss of the so - called 'Chosen One' even as a baby. There might be widespread grief and fear among those who opposed Voldemort, as they had placed so many hopes on Harry. Another aspect could be how Voldemort's reign of terror continues without the threat of Harry Potter. He might become even more powerful and tyrannical, with no one to oppose him in the way Harry was prophesied to.
One possible plot development could be that his friends rally around him. They might search for rare potions or spells to heal him. For example, Hermione could be scouring the library for ancient healing magic while Ron stays by Harry's side, offering moral support.