Well, Fleur is a complex character. When she finds out about Harry's abuse, she might initially be in disbelief. But once it sinks in, she would feel a deep sense of sympathy. Fleur might use her own experiences to relate to Harry. For example, she has faced prejudice in the wizarding world due to her Veela heritage. She could draw on that strength and determination to help Harry. She may offer him a place to stay away from his abusers, and use her magic to create a safe and comfortable environment for him. Also, she could start training Harry in some defensive magic so that he can protect himself in the future.
She might be shocked at first. Daphne could then become very protective of Harry. Maybe she tries to find ways to keep him safe from the source of the abuse.
Viktor might be shocked at first. He could feel a strong sense of protectiveness towards Harry. Maybe he immediately tries to comfort Harry and assure him that he's not alone anymore.
Well, Dumbledore has always had a special connection with Harry. When he finds out about the abuse, he would be devastated. His first instinct would be to comfort Harry. He might also reflect on his own actions and whether he could have prevented the abuse from happening. Dumbledore would then use all of his resources to make sure Harry is safe and happy. He could provide Harry with a mentor or a guide to help him through the difficult times, someone who can teach Harry how to cope with his past and move forward in a positive way.
Fleur might expose them. If they are students, they could face expulsion from Hogwarts.
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.
He might be filled with rage. James Potter was a loving father figure in his own right. So, when he finds out about Harry's abuse, he could immediately seek to confront the abuser. He would want to protect Harry at all costs and might use his magical skills to ensure Harry's safety.
At first, Harry would likely be shocked and angry. He's used to being in dangerous situations, but being kidnapped by Fleur, someone he thought was an ally, would be a big betrayal. He'd probably try to fight back immediately, using his magic if he could.
She might be shocked and angry. Thalia is a protective character. She could immediately vow to find those who abused Percy and make them pay. For example, she might start by gathering information about the abuse, asking Percy for details in a gentle way to not further traumatize him.