The plot could be that Harry's parents are in a magically-induced coma. The Dursleys are tasked with looking after Harry until a cure can be found. Harry might feel a sense of isolation as he is with the Dursleys but constantly thinking about his parents. He could start to show early signs of magic, which terrifies the Dursleys even more, but also gives him hope that he can somehow use his powers to wake his parents up.
One possibility could be that in this fanfiction, Harry's parents are in some sort of magical stasis or hidden away. The Dursleys, perhaps forced by some magical contract or under a spell, reluctantly take Harry in while his parents' situation is being sorted out. This could lead to a very different dynamic than the canon, with Harry constantly longing to find his parents and the Dursleys being more on edge as they have to deal with a magical child while his powerful parents are still in the picture.
One possible plot twist could be that Harry's parents were actually in hiding all this time and had faked their deaths to protect Harry from an even greater threat. Another could be that they were turned into different forms and were secretly living among the wizarding community without Harry knowing.
A potential plot development might be that Voldemort, upon hearing that the Potters are alive, would be enraged and try to attack them again. This would lead to a new series of battles and challenges for Harry and his parents. They would have to work together to fight off Voldemort and his followers. Also, Harry's parents could help him unlock new magical abilities or knowledge that he didn't have access to before because they are more experienced wizards.
Perhaps the wizarding world is in a state of chaos and Hogwarts is no longer considered a safe place. So, Harry's parents keep him at home. They might form a small group of like - minded wizards and witches who also want to keep their children away from Hogwarts. Together, they create their own mini - school or study group where they exchange knowledge and magic techniques. Harry could grow up with a closer - knit community and develop strong bonds with these families.
Voldemort could still be the main antagonist. Even if Harry leaves his parents early, Voldemort might be hunting for him due to the prophecy. His dark presence would be a constant threat, driving Harry's actions and the plot of the fanfiction.
One possible plot development could be Harry finding a new magical family or community that accepts him wholeheartedly. Maybe he discovers a hidden magical society that has been observing him at the Dursleys and now offers him a real home and proper magical training.
A typical plot element could be the conflict that arises from their presence. Some in the wizarding world might be suspicious or even afraid of the idea of the Potters being brought back to life. There could be a struggle between those who support Harry and his parents and those who think it's against the natural order of things. This can create a lot of drama and tension in the fanfic, making it an exciting read.
If Harry is abandoned by his alive parents in fanfiction, it could completely change the story. For one, he might not grow up with the Dursleys. He could end up in a different magical or muggle family. This new family could either be very loving or have their own ulterior motives. His personality might also be different as he wouldn't have the same experiences of being an unwanted child in the Dursley's house. He could be more confident or perhaps more bitter depending on how his new family treated him.
Well, perhaps the fanfiction could start with Harry finding a way to bring his parents back temporarily. Then he begins to teach them about the modern wizarding world. He could teach them about magical creatures they never got to see, like hippogriffs. He'd also teach them about the political situation at Hogwarts and in the wizarding community, which has changed a great deal since their time. It would be a story full of discovery for his parents and a chance for Harry to have a proper family experience.
Maybe in the fanfiction, Harry discovers a magical artifact that has the power to bring back the dead for a short time. When he activates it, his parents appear. They are a bit disoriented at first. His father, James, is amazed at how much Harry has grown and is like him in many ways. Lily, his mother, is just so happy to hold him. They talk about the wizarding world as it is now compared to when they were alive. Harry also shares his experiences at Hogwarts and how he defeated Voldemort, and his parents are filled with pride for their son.