There could also be new characters introduced specifically for the fanfiction. Maybe a young wizard or witch who has a special connection to the seals from birth. This character could be an outcast in the normal wizarding world but find their place when they interact with the seals. They could then team up with Harry and his friends to explore the mysteries of the seals.
In some versions of the fanfiction, the seals themselves could be considered main characters in a way. They could have their own personalities, desires, and goals. Their actions and interactions with the human characters would drive the plot forward. For example, a particularly mischievous seal might lead Harry and his friends into a dangerous but exciting situation.
Well, Harry Potter would likely still be one of the main characters. He might be the one to discover the seals and their significance in the magical world. Hermione would also be important as she would use her vast knowledge to research about the seals. Ron could be there for moral support and also to join in on the adventures related to the seals.
It's possible that Hermione could be a main character too. She might interact with the Navy Seal character, perhaps learning from their combat and strategic thinking. Another likely main character could be a Navy Seal team leader who gets involved in the wizarding world's battles and forms an alliance with the Hogwarts students.
There might be some original characters created for the fanfic. For example, a wizard who has prior experience as a Navy Seal in the Muggle world and now brings those skills back to the wizarding world. He could be a mentor - like figure, teaching other wizards about things like discipline and combat strategies. Or maybe Ron could also take on a more prominent role, with his loyalty and courage being emphasized in a Navy Seal - inspired context.
Perhaps it could be a well - known character from the original Harry Potter series who discovers a new aspect of their magic. For example, Hermione might find that she has an aptitude for seal magic while researching some ancient texts in the library. She could then use her knowledge and newfound ability to solve some of the problems in the wizarding world.
The main characters could be put in great danger. For Harry, he might find himself facing new dark forces that were sealed away. Hermione would be scrambling to research ways to fix the broken seal or at least understand what has been unleashed. Ron could be caught in the middle of battles against the new threats that have emerged from the broken seal.
In addition to the ones mentioned, Dumbledore could be a main character in some fanfictions. He knew Flamel, so he could play an important role in stories about Flamel. Voldemort could also be a main character as he was after the Philosopher's Stone, and his actions could be intertwined with Flamel's story. There could also be original characters created by the fanfiction authors who interact with Flamel and the other known characters.
It could be that Dumbledore plays a more prominent role in this fanfiction. Since it's about 'the truth', perhaps Dumbledore has some secrets that are finally revealed, and he becomes a central figure in guiding Harry towards understanding. Additionally, some minor characters from the original series might be elevated to main characters if they hold key pieces of the truth.
I'm not sure specifically as it depends on the particular fanfiction. But it could include Harry Potter himself, perhaps having a special connection to Ancalagon. There might also be new characters created specifically for this fanfiction that are key to the Ancalagon - related storylines.
It's hard to say for sure without reading it, but it's likely that Harry Potter himself would be one of the main characters. He could be at the center of the story, dealing with the brimstone - related events. Hermione and Ron might also be involved, using their skills and knowledge to help Harry figure out what's going on with the brimstone mystery.
The main characters are usually James Potter, Sirius Black, Remus Lupin, and Peter Pettigrew. They are known as the Marauders. James is often depicted as a confident and talented wizard. Sirius is the rebellious one, with a bit of a wild side. Remus is the more reserved and intellectual one, due to his condition as a werewolf. And Peter is the tag - along, though his character can be quite complex in different fanfictions.
Hermione Granger might also be a main character. Given her intelligence and thirst for knowledge, she would probably be involved in researching about Phobos and its implications in the magical world. She could be the one to figure out how to use or counter any threats related to Phobos.