Harry would be extremely angry and immediately rush to her rescue. He has a strong sense of loyalty towards Hermione and would not tolerate her being in such a dangerous situation. Ron, on the other hand, would also be very worried. He might start panicking a bit at first but then quickly gather his courage and follow Harry's lead in trying to free Hermione.
Harry, as we all know, has his group of friends like Ron and Hermione in the original story. But in this fanfiction, Gabby becomes a central figure in his life. Gabby could be a character who is new to the wizarding world of Hogwarts or she could be someone with a mysterious past that Harry is drawn to uncover. Their relationship and the development of their characters are what drive the story forward.
Most likely Harry Potter himself would be one of the main characters, as he is the central figure in the original series. Hermione and Ron would probably also play important roles as they are Harry's closest friends.
Hermione, on the other hand, would likely have a more critical view. She'd analyze the fanfictions for their accuracy in terms of magic lore and Hogwarts traditions. If there were any inaccuracies, she'd be quite perturbed. However, she might also appreciate the creativity that goes into some of the well - written ones that add new dimensions to their magical world.
The professors at Hogwarts would have different reactions. Professor Snape might be secretly intrigued by this new and strange creature while outwardly showing disdain. Professor McGonagall would be concerned for the safety of the students and would start organizing protection spells around the school. Hagrid, being the lover of strange creatures, might try to approach it in a friendly way at first, until he realizes how dangerous it is.
It could interact in various ways. It might help a character in danger, like if the character is poisoned, the flower could have a healing effect. Or it could be that the flower attracts the attention of a character, leading them to a new discovery.
Most likely Harry Potter would be one of the main characters, since it's in the title. There may also be Hermione and Ron, as they are always by Harry's side in most Harry Potter - related stories. But since it's a fan fiction, there could be new characters created by the author as well.
In a lot of these fan fictions, Harry is often the hero, but Malfoy can be a very interesting anti - hero. His family's dark past and his own growth throughout the series make him a character with a lot of potential for development in fan - created stories. And Salazar Slytherin, as the founder of one of the Hogwarts houses, brings an air of mystery. Fans are always interested in exploring his character, whether he's portrayed as a villain or someone with a more nuanced backstory.
The main characters are most likely Harry and Hedwig. Since the title mentions Hedwig's hurt and Harry snaps, they are bound to be central to the story.
The Death Eaters and their sympathizers would be terrified. Harry, as the overlord, would be a major threat to their ideology. Voldemort, if he somehow still existed in this fanfiction, would be in direct opposition to Harry. However, some of the more neutral characters, like Luna, would probably see Harry's new role as an opportunity for positive change in the wizarding world and would be happy to support him in his endeavors.