Well, in certain fanfic, Harry could react with more caution. He might be constantly doubting the motives of those around him, even his closest friends. Maybe the author is exploring a 'what if' scenario where Harry has had some experiences that made him more paranoid. So instead of jumping into things like he did in the original story, he takes his time to assess every situation.
Heirs in Harry Potter fanfic are often shown as having a special mission or purpose. They might be the only ones who can unlock a certain mystery or power. For example, an heir to Ravenclaw could be the only one who can solve the riddle to access a hidden library. Descendants, on the other hand, are more about the family connection. They may be part of a large family and have normal lives within the wizarding world, like the numerous descendants of the Black family who have different personalities and magical abilities but not all are heirs with a specific task.
Well, in some fanfics, Tom Riddle is portrayed as having a bit more humanity. Maybe he has a love interest that makes him question his dark ways. This is different from the books where he seems fully committed to the dark side from a young age.
In some Harry Potter fanfics, magical creatures like the werewolf might be portrayed more sympathetically. Instead of just being seen as dangerous during full moons, they could be shown as struggling with their condition. For example, a fanfic might focus on a werewolf trying to lead a normal life among wizards.
He might be shocked. In fanfiction, the future could be full of strange twists. For example, if his friends' children are involved in some wild adventures that are very different from what he expects. He would probably be confused at first, then curious to understand how things got to that point.
In fanfic, their relationship can be less hostile. For example, Snape may not be as harsh with Harry in class as he was in the books. He could be more understanding of Harry's situation, especially considering Harry's role in the fight against Voldemort.
Harry might become more isolated from his peers at Hogwarts. Since he was raised by a lich, he may have different values and a darker sense of humor. His views on life and death could be more complex compared to other students.
Harry's character would be shaped by Sirius' values. Sirius values loyalty above all else, and Harry would grow up with a deeper understanding of what it means to be loyal to friends and family. He would also be more in touch with his emotions. Sirius, having suffered so much, would encourage Harry to express his feelings. This would make Harry a more well - rounded and emotionally intelligent character compared to the sometimes stoic Harry in the original series.
The power of augureys is often enhanced in fanfic. While in the books, their significance was somewhat limited. In fanfic, they might have the ability to heal with their feathers, or their song could have the power to put dark creatures to sleep. This expansion of their abilities makes them more interesting and central to the plot in many fan - created stories.
In the original Harry Potter series, Reparo is mainly used for simple object repairs like glasses. But in fanfic, it can be used more creatively. For example, to repair a whole building that has been magically destroyed. Fanfic authors might also use it on more complex magical items that we didn't see in the original books.