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 the 'Harry Joins Death Eaters Fanfic', Harry's journey would be extremely complex. Firstly, his reasons for joining could vary. It might be due to some sort of mind - control spell or a false sense of belonging. Once he's in, he'd have to deal with the inner workings of the Death Eaters. He'd see their cruelty up close and might start to regret his decision. However, getting out would be difficult. He'd have to face the wrath of Voldemort and his followers. His character would be greatly changed, and the story would explore themes of redemption, if he ever tries to return to the good side, or his complete downfall into darkness.
The wizarding world would be in shock. Harry was seen as the 'Chosen One' to defeat Voldemort. If he joined the Death Eaters, the Order of the Phoenix would feel betrayed. They might try to rescue him or think he's been an undercover agent all along. Hogwarts would be in chaos, and students would be confused and scared.
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.
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, 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.
The Hogwarts students would be divided. Some would be in disbelief and would still hope that Harry has a good reason for joining. They might secretly support him. Others, especially those who have lost family members to the Death Eaters, would be furious and see Harry as a traitor. Harry's old enemies at Hogwarts, like Draco Malfoy, would also be confused. Draco might initially think that Harry has finally seen the 'right' side, but as he realizes Harry's true intentions (if they are good), he would be conflicted as well since he's been brought up in a Death Eater - influenced family.
In a 'Harry joins Avengers' fanfic, it could be really exciting. Maybe Harry would use his magic to help the Avengers in unique ways. For example, he could use spells to disarm villains quickly or create magical shields. His broomstick skills might also come in handy for quick getaways or aerial attacks.
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.
The Order of the Phoenix would see Harry's joining of the Death Eaters as a major setback. They would likely view it as a sign that Voldemort has become even more powerful. Dumbledore, if he were still alive, would be very concerned and would try to understand what led Harry to this decision. He would also be devising a plan to get Harry out of the clutches of the Death Eaters.
Well, perhaps in this fanfiction, there's a big misunderstanding. Harry might think that by infiltrating the Death Eaters as one of them, he can actually bring them down from the inside. So he pretends to join them, but things get out of hand as he has to constantly prove his loyalty to the dark side, which is really difficult for him.
Well, in such a fanfic, Harry could use powerful spells like the Blasting Curse to take on the Death Eaters. Maybe he discovers a new, super - powerful spell that causes a huge explosion, wiping out a large group of Death Eaters at once.