Hermione and Ron are often present. Hermione might be trying to research ways to help Harry control his demon side. Ron could be initially a bit wary but still stand by Harry.
Hermione and Ron are usually still there. Hermione would likely be an important figure, perhaps helping Harry keep her secret or being the first to suspect something different about her. Ron might have a different reaction to Harry being a girl, maybe with some initial confusion but still remaining a loyal friend.
Hermione is often a common character. She might help Harry research and understand the ancient magic, using her vast knowledge from the library. Ron could also be there, providing his loyalty and sometimes comic relief during Harry's journey of learning ancient magic.
There could be his drill sergeant. A tough but fair character who pushes Harry to his limits. Maybe he has a name like Sergeant Thompson.
Well, in some cases, there could be minor characters from the original series who still interact with Harry on a limited basis. For example, Neville Longbottom might make an appearance. Even though Harry is alone for the most part, Neville could cross paths with him and have a brief conversation or exchange that has an impact on Harry's journey.
There could be Ron. He might be Harry's sidekick in the gambling adventures, either joining him in bets or trying to stop him when things get out of hand. Ron's loyalty would play a big part in their relationship within the story.
Ron might also be a main character. He could be initially skeptical of Harry's new powers but eventually come around and support him. He might even use his own skills, like his chess - playing strategy, to help Harry in battles or challenges related to his Dragonborn status.
Ron could also be a main character. He might initially be a bit confused or even jealous of Harry's new powers as an elf, but then come around to support him. His family, like the Weasleys, could also be involved, perhaps providing a different perspective on elves compared to the pure - blood wizarding families.
It's hard to say for sure without reading the fanfiction, but it's likely that Ron and Hermione are still important characters. They are Harry's closest friends in the original series, and their relationships with a prodigy - Harry would be interesting to explore. Maybe they have to deal with feeling overshadowed by Harry's new - found prodigious abilities.
Hermione is often a common character. She might be helping Harry with research related to the potions professor's strange behavior or new potions they are working on. For example, she could be scouring the library for information about a rare ingredient the professor has introduced.
There could be a new character introduced, a healer perhaps, who is intrigued by Harry's condition as a blind seer. This character could play an important role in trying to understand the nature of his seer abilities and whether there is a way to either enhance or control them. Another possibility is a rival seer who is jealous of Harry's unique situation and tries to undermine him throughout the story.