Ron Weasley also frequently appears. He provides the much - needed comic relief at times and is a loyal friend to Harry. They often go on adventures together, and Ron's insecurities and growth as a character can add depth to the story.
Voldemort is another common character. Fanfiction might explore different aspects of his backstory or create new battles between him and Harry. There could also be scenarios where Voldemort has different motives or powers than in the original series, which makes for interesting twists in the plot.
Ron could also be there. He might be a bit jealous at first if Harry's adopted family is wealthier or has more influence in the wizarding world. But later, he would support Harry as always.
Hermione could still be a common character. Even in fanfiction where Harry is alone, Hermione might be mentioned in his thoughts or in flashbacks as someone who has influenced him. For example, he might recall her advice on how to study magic when he is facing a difficult spell alone.
Draco Malfoy is a very common character. Since they are in the same house in this fanfiction concept, their interactions would be different from the original story. There would likely be more opportunities for them to either become friends or rivals in a new way.
There could be some original characters created by the fanfiction authors. These could be Harry's new classmates or friends at Durmstrang. They might have their own unique magical skills and personalities, and through their interactions with Harry, they can help develop the story further. For example, a new friend could introduce Harry to a secret part of the Durmstrang grounds or a special magical technique that's unique to the school.
Often, there are advisers or mentors. These are characters who have a lot of knowledge about the monarchy and its workings. They might be old nobles or wise scholars who help Harry understand the ropes of being the heir. There could also be antagonists like power - hungry nobles who see Harry as a threat to their own ambitions and try to get rid of him.
Hermione is often a common character. She would probably be by Harry's side, using her vast knowledge to help him understand his role as the Gryffindor heir. Ron might also be there, providing his loyalty and comic relief in tense situations.
Ron could also be there. He'd bring his sense of humor and loyalty. Maybe in a story set in Australia, Ron would be the one to make friends with the local magical folk first because of his easy - going nature, and then introduce Harry to them.
Ginny Weasley could be another character. Given her relationship with Harry in the original series, in the fanfiction she might be part of the harem, bringing her own strong - willed and talented self into the mix, and her experience with the Weasley family's magic and values could influence the group.
Ron could also be there. He might be initially scared of the dragon but then grows to like it. His loyalty to Harry would make him support Harry's decisions regarding the dragon, even if they seem risky. For example, when they need to hide the dragon from the Ministry of Magic, Ron would be right there with Harry, coming up with crazy but effective plans.
Hermione would probably be there. She's Harry's best friend and always helps him in his adventures, so in a fanfiction about Harry discovering his heritage, she would be by his side, using her vast knowledge to help him figure things out.