He could be shocked at first. In many fanfics, Malfoy has this image of Harry as a rival and a 'golden boy'. Discovering that Harry has been abused shatters that perception. He might feel guilty for all the times he has bullied Harry in the past.
Malfoy might try to help Harry secretly. He doesn't want to be seen as soft or sympathetic by his Slytherin peers, but his conscience won't let him ignore Harry's situation. For example, he could leave some potions or spells that could help Harry heal his physical or mental wounds near Harry's dorm without anyone noticing.
The other students could have a range of reactions. Some might be sympathetic and try to befriend Harry more. Others might be afraid, especially if the abuser is still around. But overall, it would create a stir in the wizarding community, and there would be a general outpouring of concern for Harry's well - being.
In the fanfic 'Malfoy's Revelation', Malfoy is paired with Harry for a project. As they spend time together, Malfoy notices some strange behaviors from Harry, like flinching at sudden movements. After some snooping around, he discovers that Harry has been abused. This new knowledge makes Malfoy more empathetic towards Harry and he tries to help him in his own way, which includes standing up for Harry against some of their mutual enemies at Hogwarts.
She might be extremely angry. In many fanfictions, Ginny is a strong - willed character. So, she could immediately seek justice for Harry, perhaps by confronting those who were responsible for the abuse in the story.
Rita could have a complex reaction. On one hand, she might feel a twinge of pity for Harry, but on the other, her journalist instincts would kick in. She might start interviewing people around Harry surreptitiously to gather more information. However, she would also be careful not to cross certain lines as she doesn't want to make powerful enemies in the wizarding community. She might try to get Harry's side of the story, but in a way that serves her own purposes, like getting exclusive rights to his story so she can write a best - selling exposé.
Fleur might expose them. If they are students, they could face expulsion from Hogwarts.
Dumbledore's reaction could be complex. He might feel guilty for not realizing it sooner. In some fanfictions, he would try to make amends by providing more support and protection to Harry. Other teachers at Hogwarts, like McGonagall, would be sympathetic and might offer their own forms of help, like extra tutoring or a place for Harry to relax.
Charlie may first show confusion. He might think there's some misunderstanding. But once he realizes it's true, he could become very protective. He might offer to teach Harry self - defense skills if it's physical abuse, or help him build his confidence back if it's emotional abuse. Charlie could also try to get help from others he trusts, like friends or other authority figures in the fanfiction world, to make sure Harry is removed from the abusive situation as soon as possible.
Hermione would probably be very angry and start researching ways to help Harry legally in the wizarding world. Ron, on the other hand, would be ready to fight anyone who had hurt Harry.
After the discovery, a possible plot development could be that the champion takes Harry away to a secret location to keep him safe. From there, they might try to heal Harry's emotional wounds. As they do this, they could encounter various obstacles, like the abuser trying to find them or the wizarding authorities not believing their story. The champion might then have to prove Harry's situation, which could involve finding witnesses or evidence. Another development could be that the champion's actions draw the attention of a powerful and mysterious figure in the wizarding world, who either helps or hinders their efforts to protect Harry. This could lead to a whole new set of challenges and adventures in the fanfiction.
Maybe Harry is being abused in a way that is related to his past as the Boy Who Lived. Some people might be jealous or afraid of his power and try to harm him. Malfoy could be in a situation where he realizes that Harry's downfall would actually be bad for the wizarding world in the long run. So, he rescues Harry. Then, they could go on an adventure to expose those who were behind the abuse. They might face many challenges along the way, but their new - found cooperation could be the key to their success.