Harry's first reaction in the fanfiction could be one of confusion. He's used to Draco being his nemesis, always making snide remarks and competing with him. So when he realizes Draco is under the Imperious Curse, it doesn't immediately click in his mind. He might start to replay all of Draco's recent actions in his head, trying to make sense of it. Then, as the realization dawns on him, he would be both horrified and determined. Horrified that such a dark magic is being used on a fellow student, and determined to get to the bottom of it and free Draco from the curse's control.
When Harry first discovers that Draco is Imperious, he may initially be suspicious. He would question whether it's some sort of trick Draco is playing. But as he observes Draco more closely and sees the glazed look in his eyes or the uncharacteristic actions, Harry will start to believe it. Then he would probably feel a mix of emotions. There's the shock, as I said, but also a sense of responsibility. He might think that he has to do something about it, like find a way to break the curse. Harry could also be a bit angry that someone would use Draco in such a way, even though they have their differences.
Harry is likely to be shocked at first. He has always seen Draco as a self - willed rival, so finding out that Draco is being controlled by the Imperious Curse completely changes his perception. He might freeze for a moment, trying to process what he has just realized.
Well, in many such fanfictions, Harry might be shocked at first. He probably feels a sense of pity for Draco too. After all, being under the Imperius Curse means Draco has no control over his actions.
Harry might be shocked at first. He'd probably feel a sense of urgency to break the Imperius Curse. He could also feel a bit of pity for Draco, as Draco is being controlled against his will.
Well, in this type of fanfiction, a plot point could be the change in Draco's behavior. Since he is under the Imperious Curse, his actions might seem out of character. Harry might notice that Draco is doing things that he wouldn't normally do. For example, Draco might be acting more subservient or being forced to target Harry in a more malicious way than before. This would make Harry start to suspect something is wrong. Also, there could be a plot point where Harry has to convince his friends, like Hermione and Ron, that Draco is not acting of his own free will. They might be skeptical at first, but as Harry uncovers more evidence, they come around to help him figure out how to break the curse on Draco.
He'd probably be shocked. I mean, Dudley has always seen Harry as the odd one out in the family, and suddenly finding out he's famous in a whole different world of fanfiction would be quite a surprise.
He could be stunned. Draco has probably heard about Harry's scars but seeing them in person is a whole different thing. It might make him speechless for a moment.
Snape might be initially shocked but then try to hide his concern. He's a complex character. He could act indifferent in public but secretly start to gather information about who is behind the abuse. He might also start to keep a closer eye on Harry without the boy realizing it.
He might be shocked at first. Then he could feel a strong sense of protectiveness towards Harry. Maybe he immediately tries to find ways to keep Harry safe from further harm, like staying closer to him at all times.
Well, Bill could be shocked at first. But then he would likely become very protective. He may take Harry to a safe place, like the Burrow, and gather his family around to support Harry. He would also probably try to find out more about the abuse, like who was behind it and for how long it had been going on. He'd be determined to make sure it never happened again.
Sirius would likely be extremely angry. He already has a protective streak towards Harry. He might immediately confront those he suspects of the abuse, whether it's the Dursleys or others at Hogwarts. He would probably also try to remove Harry from the situation as quickly as possible.
Arthur might be shocked and immediately want to protect Harry. He could start by confronting those who are abusing Harry or find a safe place for Harry to stay.