It might be Hermione. She's very intelligent and strong - willed, but she also has her vulnerabilities. The fanfiction could center around her pain, perhaps the pain of feeling like she has to always be the one with the answers and the pressure that comes with that. Or it could be about her pain of seeing her friends in danger and not being able to always protect them, which is an 'exquisite pain' as she deeply cares about them.
There's also a chance that the main character is a new or minor character. The author might have created a character who witnesses some of the major events in the Harry Potter world from the sidelines and experiences an 'exquisite pain' because of it. For example, a young Hufflepuff student who sees the destruction of the school during the Battle of Hogwarts and has to deal with the pain of losing the sense of safety and the idyllic world they once knew.
I don't know for sure without reading it, but it could be Harry Potter himself. He has faced so many challenges and traumas throughout the series that this fanfiction might focus on another aspect of his pain, something more 'exquisite' in nature, like the pain of not being able to fully trust those around him despite having friends.
I'm not sure specifically as I haven't read that exact fanfiction. But generally, it could be about a character in the Harry Potter universe experiencing a very refined or intense form of pain, perhaps emotional pain like heartbreak, or the pain of loss, set within the context of the magical world.
Well, it could be that the main characters are not just the trio from the original Harry Potter books. It might introduce new characters who are specifically created for this fanfiction to better fit the Six Paths of Pain theme. However, if it follows the original story closely, it's likely that Harry Potter would be a main character, with Voldemort perhaps being another important figure as the source of the 'pain' in some way. And there could be other characters like Dumbledore who might play a role in guiding the characters through the six paths of pain, whether it's helping them understand or resist the power related to it.
How about Neville Longbottom? He could be the main character in a fanfiction set in the Chamber. Neville, who has always been underestimated, could show his true courage and strength. He might discover a hidden ability that helps him face the challenges in the Chamber, perhaps something related to his connection with plants, which could play a crucial role in defeating the Basilisk or whatever new threat is in the Chamber.
A lesser - known character like Ernie Macmillan from Hufflepuff could be the main character. As a prefect, he could bring out the unique qualities of Hufflepuff house. He might have to deal with issues like other houses underestimating Hufflepuff students. His story could focus on how he promotes the values of hard work, loyalty, and fairness within the house and the school as a whole.
Hermione could be a great main character. She's curious and intelligent, so she would be really interested in exploring the secrets of the diary. She could use her vast knowledge of magic to try and figure out how the diary works and what secrets it holds.
Harry Potter himself could be the main character as a revenant. Maybe he has some unresolved issues from his past, like his relationship with his parents. His revenant form could be on a journey to fully understand their sacrifice and his own place in the wizarding world's history.
Harry Potter might still be the main character even with Merlin's return. Merlin could be more of a guiding or helping figure, and Harry would be the one who ultimately has to face the main challenges with Merlin's assistance. So Harry would remain at the core of the story.
There's no one - size - fits - all answer for the main character in 'Son of the Stars' Harry Potter fanfiction. It could be an individual with extraordinary magical abilities related to the stars. For instance, they might be able to teleport using star - maps or have a special wand made from a star - touched material. This character could be on a journey to uncover the truth about their star - related heritage and in the process, they get involved in various adventures at Hogwarts or in the wider wizarding world, facing off against dark wizards or uncovering ancient secrets.
It could be a younger sibling of one of the main characters in the original series. For example, Ginny's little sister who has big shoes to fill but also a great passion for Quidditch.
Hermione could be a great main character in an elementalist fanfiction. Her intelligence and thirst for knowledge would make her eager to learn about and master elemental magic. She could be the one to discover a long - lost elemental spell book and start exploring the powers.