Ginny would be very empathetic. She'd probably try to understand Hermione's situation from a female perspective. Ginny might try to get some female friends or relatives to help out, like bringing food or warm clothes to Hermione. Luna would be her usual unique self. She might think that Hermione is on a special spiritual journey and would offer her some very strange but oddly comforting advice.
Harry would likely be furious. He'd immediately start planning to rescue Hermione. He might try to gather evidence of the dark magic used to enslave her and take it to the teachers. Ron, on the other hand, would be impulsive. He'd probably want to storm into the Slytherin common room right away to free Hermione, without much of a plan.
Well, initially, her friends would be stunned. Harry would be at a loss for words. He'd be thinking about all the times they had together and how Hermione's appearance was part of who she was. Ron would probably blurt out something insensitive in his shock. But as time passed, Harry would start to see that Hermione was still the same person inside. Ron would slowly come around too, especially when he realized that Hermione's decision was more complex than he first thought. Ginny would be the one to really help Hermione feel accepted, reminding her that her true self was more important than her new look.
Harry would be extremely worried and determined to find a cure. He'd probably search every corner of the library and consult all his wizarding contacts. Ron, on the other hand, would be initially in shock but then would try to cheer her up with his clumsy humor.
Hermione's friends would likely be very excited. They might plan some special activities for her parents. For instance, they could arrange a little tour of the Forbidden Forest (from a safe distance, of course). They would also share stories about Hermione at Hogwarts, how smart she is and all the adventures they've had together. And they would be happy to answer any questions Hermione's parents had about the wizarding world.
Harry and Ron would probably be shocked at first. Ron might be a bit scared, but Harry would quickly see the potential in Hermione's new ability. They would likely be proud of her for achieving such a difficult transformation and would support her in using it for good.
She might be initially shocked. After all, she would have trusted her friends a great deal. Then she could become very sad and withdrawn. She might throw herself into her studies even more as a way to cope, trying to distract herself from the pain of losing her friends.
After the initial reactions, Hermione may choose to isolate herself for a while to figure things out. She would use this time to study and research, trying to find a solution to the problem with her friends. She might also look for new allies or resources within the fanfiction world to help her deal with the situation.
She might be initially shocked and hurt. Hermione is a character who values her friendships deeply, so their sudden departure would be a big blow. She could spend some time in denial, not believing that they would actually leave her.
Harry and Ron would likely be very shocked and concerned. They know Fenrir is a dangerous werewolf, and they might not understand how Hermione got into this situation. They would probably try to persuade Hermione to leave Fenrir at first.
Hermione's friends from Hogwarts like Harry and Ron might be a bit shocked at first. Ron, in particular, might have some mixed feelings as he has had a bit of a competitive streak with Viktor in the past. But eventually, they would come around and support her. Viktor's friends from Durmstrang would probably be more accepting as they might respect his choice more blindly. They could be excited for him and offer their own unique magical gifts or knowledge for the upcoming baby.