It's likely that Harry would face a great internal struggle. On one hand, he has been brought up with the values of the Order of Phoenix and Hogwarts. On the other hand, the Death Eaters' way of life is being forced upon him. This could lead to a very complex character development, with Harry constantly trying to find a way to escape their clutches and return to his true friends and the fight against Voldemort in a more traditional sense.
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.
Well, if we look at 'Harry Joins Death Eaters Fanfic', it could lead to a whole new set of storylines. Harry might be lured in by the power the Death Eaters seem to have. He could start using dark magic, and his moral compass would be all messed up. Maybe he'd be used by Voldemort to infiltrate the Order of the Phoenix from the inside. It would be a very different Harry, one who has lost his way and is now on the side of evil.
In such a fanfiction, the whole story of Harry Potter would be drastically changed. Harry might grow up with very different values and beliefs. Instead of being against the Dark Arts, he could be initially inclined towards them. His relationships at Hogwarts would be in turmoil as his friends, who are mostly against the Death Eaters, would view him with suspicion.
If Death Eaters read the books fanfiction, they could potentially find new ideas for their own dark deeds. However, they might also be exposed to different values and worldviews presented in the fanfiction that could cause some internal conflict. For example, if a fanfiction shows a character they admire choosing a path of redemption, it could make them question their own loyalty to the Dark Lord.
His magical education would be very different. Instead of learning at Hogwarts, he might be taught in some dark and secret location by Death Eater instructors. They would likely focus on dark spells and hexes.
One way this could happen is if Harry Potter discovers a new form of magic that can reverse the dark magic influencing the Death Eaters. Maybe he finds a powerful spell during his exploration of ancient magic that can purify their souls and free them from Voldemort's control.
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.
Well, she could end up in a duel with a powerful Death Eater. Hermione is a very skilled witch, so it would be a great show of her magical abilities. Maybe she discovers a new spell during the fight that helps her gain the upper hand.
Well, they might get some new and unexpected ideas. Maybe they'd start to question their own actions and beliefs in the context of the fanfic's different interpretations. It could also lead to some internal conflicts among them as they see different versions of themselves or their world in the fanfic stories.
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.