The transformation of Harry Potter into a werewolf in the fanfiction could have a huge effect on his relationships. His enemies might use it against him, and his allies might have to work harder to protect him. Also, it could change how he sees himself and how he interacts with the magical world as a whole.
If Harry is sleepwalking, it might worry his friends. For example, Hermione would probably be very concerned and try to find a way to stop it. This could strengthen their friendship as she devotes time to helping him. Ron, on the other hand, might initially find it funny but then also realize the seriousness. It could also make some of his classmates more curious about him, which could either bring them closer or create some distance depending on how they react to his sleepwalking episodes.
It might make his relationships more interesting. If he reads fanfiction that has unique takes on his friendships, like a story that shows a deeper bond between him and Hermione, he could be more conscious of those relationships in real life and try to strengthen them further.
Well, it could enhance his friendships. For example, he'd be able to tell when Ron or Hermione were feeling down and offer immediate comfort. It might also make his enemies more wary of him, as he could sense their malicious intents. He could use this ability to his advantage in the wizarding battles, being able to anticipate his opponents' moves based on their emotions.
His friends might be initially terrified. Hermione, for example, would be both scared and immediately start researching how to reverse it. Ron would probably be more shocked and not know how to react at first. Their friendship would be tested as they try to figure out what to do. They might have to keep Harry's transformation a secret from other students to protect him from being hunted or experimented on.
His relationship with Dumbledore could become more complex. Dumbledore knew Sirius well, and if Harry starts emulating Sirius' more impulsive side, Dumbledore might have to be more hands - on in guiding Harry. On the other hand, among the other Gryffindors, Harry could become a sort of leader figure. Since Sirius was a popular and respected Gryffindor in his time, Harry acting like him could inspire his housemates and lead to more group activities and a stronger sense of unity within Gryffindor.
With his friends, it could initially cause confusion. They are so used to calling him Harry that the new name might be a bit of a shock. But if they understand his reasons, they would likely support him. For example, Hermione might be the first to adapt and help others adjust, using her logical thinking to see the benefits of the name change.
If Harry absorbs the memories of his enemies, it could make his relationships with other characters more complicated. For instance, if he absorbs the memories of Draco Malfoy, he might understand Draco's family pressures better. This could lead to a more complex relationship where Harry has both sympathy and still some animosity towards Draco.
His relationship with Ginny might be affected. Ginny could be very protective of him and worry a great deal. This could lead to some sweet, tender moments between them as she takes care of him during his seizures.
With the teachers, like Dumbledore, he might be treated differently. Dumbledore might see this transformation as an opportunity for Harry to learn new things about the wizarding world from a different perspective. And some of the more traditional teachers might have different expectations of Harry's behavior in class now that he is a girl.
Some might find it charming. For example, his friends like Ron and Hermione might see it as just another part of Harry's unique personality. It could make him seem more approachable to those who are drawn to his non - conformist ways.