In a lot of these fanfictions, the Dursleys don't exist or they play a different role. Harry in the orphanage could be visited by mysterious figures from the wizarding world who are trying to keep an eye on him without revealing themselves fully. This creates a sense of mystery and danger. Also, Harry might find an old magical object in the orphanage that has a connection to his parents, which could be a central part of the story as he tries to figure out its significance.
Well, in some fanfictions of this kind, Harry might face a cruel caretaker in the orphanage. But instead of being beaten down, he uses his wits and hidden magic to stand up for himself and the other kids. He could also start to learn magic on his own, using his natural instincts, which would be a really cool plot.
In some fanfictions, there could be a magical creature that has somehow found its way into the orphanage. For example, a house - elf might be there, either sent by someone to protect Harry or just lost. This house - elf could be a key character in the story, helping Harry with small tasks and providing some comic relief. There may also be a character from the Ministry of Magic who is sent to check on Harry's well - being in the orphanage, and this person could have their own motives and secrets.
One interesting plot could be Harry going back in time and preventing certain tragedies from happening in the wizarding world, like stopping Voldemort's rise before it really began. Another could be him changing the relationships between characters, for example, making Snape and James Potter become friends early on.
One interesting plot could be that Harry Potter is sent to an alternate universe where magic is used in a completely different way. For example, instead of using wands, they use hand gestures. Another plot might be that in the alternate universe, Voldemort won in the original world, and Harry has to find a way to reverse that in this new universe. Maybe in this alternate world, the Hogwarts houses have different characteristics and he has to adapt to that new social structure as well.
One interesting aspect could be the exploration of how the orphans in the fanfiction might interact with the wizarding world. Maybe they discover their magical abilities in unique ways compared to how Harry did in the original series.
In some Harry Potter 8 fanfictions, there are plots where the characters continue to face new dark magic threats. For example, a new dark wizard might emerge, and Harry, Hermione and Ron have to use their combined skills and knowledge to defeat this new foe. Another plot could be about the exploration of the wizarding world's past in more depth, revealing secrets that were previously unknown.
In the fanfiction, it could be interesting if Harry uses his magic to protect the other orphans from bullies. He might not fully understand his powers yet, but his instincts kick in. And then when he finally gets his Hogwarts letter, the other orphans are both sad to see him go but also excited for him, and he has to figure out how to leave the only home he's known while also being eager to enter the wizarding world.
One interesting plot could be about the Potter family's hidden secrets being unearthed. Maybe there are ancient spells or prophecies related to them that no one knew before. Another could be a story where the Potter family has to face a new and powerful dark force that is specifically targeting them due to their legacy. And a third plot might involve time - traveling within the Potter family's history to correct past mistakes or learn from them.
One idea could be that Harry uses his fame and wealth to completely renovate the orphanage. He could introduce magic in a subtle way, like using magic to make the food taste better or the beds more comfortable for the kids. Another plot could involve Harry finding out that some of the orphans have latent magical abilities and he decides to mentor them privately before they are old enough to go to Hogwarts.
Another plot could be that Umbridge is forced to work with Harry and his friends against a greater evil. This would be a huge shift as she hates them so much in the original. But in the fanfiction, they might have to put aside their differences when a new dark wizard emerges, more powerful than Voldemort, and they realize they need all the help they can get.
A common plot in such fanfictions is the idea that death has a plan for Harry that goes beyond what Dumbledore or anyone else expected. It could be that death wants to use Harry to balance the magical world in a different way. So, Harry might be led to discover ancient magic that is related to life and death, and he has to decide how to use it. This could involve making alliances with creatures that are associated with death, like thestrals or dementors in a different context.