In some fanfictions, the Death Eaters might see Harry as a tool. If they find out he's abused, they could try to manipulate him. They might think that with his power and now his vulnerability, they can turn him to their side, using his anger at his abusers as a driving force.
Well, it depends on the nature of the fanfiction. Some might have the Death Eaters simply not care at all, as they are often portrayed as self - centered and only interested in their own dark goals. However, other fanfictions could show them using this knowledge to blackmail those who are supposed to be protecting Harry, like the Dumbledore's Army or the Order of the Phoenix.
They could view him as a potential recruit. If Harry has been abused, they might think he could be turned against those who he was supposed to be with, like the good wizards. They would see his abuse as a way to break his loyalty to the side of good and bring him into their dark ranks. For example, they might offer him power and protection from his abusers in exchange for his allegiance.
Well, one possibility is that Harry would be forced to learn dark magic. The Death Eaters might try to mold him into one of their own, but Harry's strong sense of good might resist. He could secretly plot against them while pretending to go along with their ways.
A possible motive could be self - preservation. If they believe that Voldemort's downfall is inevitable and that by saving Harry, they can gain some form of leniency from the side that opposes Voldemort. They might think that Harry has enough influence to spare their lives if they help him.
One consequence could be a major shift in the wizarding world's perception of good and evil. If Harry saves the Death Eaters, people would have to re - evaluate what it means to be a 'bad' wizard. There would be a lot of distrust at first, but over time, it could lead to a more forgiving society.
They might be outraged. Fanfiction often plays with the established lore and characters, and the Death Eaters, being firm believers in pure - blood supremacy and the Dark Lord's ways, would likely be horrified by any deviation from what they see as the 'true' story. They could see it as a mockery of their beliefs and actions.
Well, one possibility could be that he is forced to join them under some kind of dark magic threat. Maybe Voldemort has found a way to control his mind and he has no choice but to follow their orders. This would lead to a lot of internal conflict for Harry as he struggles with his own values.
They might be shocked and immediately want to protect Harry. For example, they could confront the abuser or find a safe place for Harry.
Well, the goblins could start a revolution of sorts. If they find out Harry is abused, they might see it as a sign of the general corruption and unfairness in the wizarding world towards those without power. They could use Harry as a symbol of this oppression and start demanding changes in the way the wizarding world treats its children. This would likely lead to a lot of conflict with the wizarding authorities, but it could also bring about much - needed reforms.
Voldemort himself, of course, is the most prominent in a sense. But in the fanfiction, his relationship with the other Death Eaters could be different. He might be more distrustful or have different expectations of them. And then there's Barty Crouch Jr. He could be a major player in the fanfiction, with his skills in disguise and dark magic. His actions could drive some of the major plotlines in the fanfiction.
Well, McGonagall is a very caring and strict character. When she discovers Harry is being abused in fanfiction, she would first ensure Harry's safety. She might offer him a safe haven at Hogwarts all year round if possible. Then, she would start an investigation into the abuse. She'd use her influence and connections in the wizarding world to get to the bottom of it and make sure justice was served for Harry.