In addition to the trio, Sirius Black could be a character in 'Harry Potter boxing fanfiction'. He could be a mysterious figure who comes back and trains Harry in some secret boxing techniques that he learned during his time in Azkaban. And Voldemort could be the ultimate villain in the boxing world of this fanfiction, with his followers trying to disrupt Harry's boxing journey.
Obviously, Harry Potter himself could be the main character. He has the skills and the popularity from the original series. Ron Weasley could also be a main character, maybe as Harry's trainer or his corner man in the boxing matches. Hermione might be involved as well, using her intelligence to strategize for Harry's boxing career.
I think it could be Neville Longbottom. Neville has grown into a strong and confident wizard. He could have discovered boxing as a form of self - defense and then decided to teach Harry. Neville would bring his own unique perspective, having been bullied in the past. He'd train Harry to be both strong and fair in the boxing ring, emphasizing the importance of honor and respect in combat.
One idea could be Harry Potter using his wizard skills in a boxing ring in a unique way. For example, he might use a levitation charm to dodge punches or use a stunning spell on his opponent's gloves to make them heavier. Another could be a story where the wizarding world has its own boxing league and Harry has to compete against other magical beings like werewolves or giants in the ring.
Hermione could be a main character. As a very intelligent witch, she might assist Harry in his teaching, like helping him prepare complex lessons or providing additional knowledge to the students. For example, when Harry is teaching about ancient spells, Hermione could offer insights from the books she has read.
Hermione could be one. She could come to Degrassi to help Harry. She'd be really good at handling the academic side of things there, like helping students with their studies. And also, she could use her magic knowledge to figure out any magical mysteries.
Hermione Granger would likely be a main character. She could use her vast knowledge to help Harry in his efforts to fix Hogwarts, whether it's researching ancient spells for repairs or coming up with new educational strategies.
Hermione could be there. She would be eager to study the different magics and books in Tamriel. Her intelligence would help Harry navigate the new world.
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.