Regarding Snape, it would be a very complex situation. Snape had his own feelings for Lily, and now with her return, his old emotions might resurface. There could be a lot of jealousy and unresolved issues between Snape and James, while Lily would be caught in the middle, trying to navigate the difficult relationship between the two men who had such a significant impact on her life.
Well, their relationship with Harry would be extremely different. Instead of being the parents he never knew, they are now present in his life. Harry might struggle with how to interact with them, as he's always idolized them. There could be a period of adjustment where they all learn to be a family.
For Harry, he would grow up with his parents. This would mean he has a much more normal childhood, with proper parental guidance. Sirius might not end up in Azkaban as he wouldn't be wrongly accused of betraying the Potters. And for Voldemort, he would face two powerful opponents instead of just a baby Harry. He would have to constantly be on guard against the Potters.
Obviously, James and Lily Potter are the main characters as the title implies. Their return is the central event. Harry Potter is also a key character as their return would greatly impact his life.
Well, Remus would probably be very understanding. He's a kind - hearted person. He could offer them advice on how to balance their studies and the upcoming parenthood. However, there might be some students who are jealous or judgmental. They might spread rumors, which could put a strain on James and Lily's relationship with some of their peers. But in the end, their true friends would stand by them, and this would strengthen their bonds with those who matter most.
Harry's view of the world might change completely. He has seen so much darkness and death. With his parents' return, he could start to see the world in a more hopeful light. He may be more willing to forgive those who have wronged him in the past, like Snape. Their return would be a catalyst for a huge shift in his personality, making him more balanced and less haunted by his past traumas.
One popular plot twist could be that they return with new magical abilities. Maybe they've gained the power to control time, which would add a whole new layer to the story. They could use this to prevent their own deaths or change other major events in the wizarding world.
In some fanfictions, James and Lily Potter might outsmart everyone by using their combined magical knowledge. For example, Lily could use her potion - making skills to create unique potions that give them an edge, while James might use his charm - work skills to deceive their opponents. Their love for each other could also be a factor, as it gives them an unwavering bond that helps them think as one and anticipate each other's moves, thus outsmarting those around them.
One possible plotline could be that Lily and James return during the time of Harry's battle with Voldemort. Their return could give Harry new strength and hope. They might use their old magical knowledge and skills to help in the fight. Maybe they could also reunite with their old friends like Sirius and Remus, and together they form a powerful force against the Dark Lord.
In a fanfiction where Lily and James Potter are alive, the plot would be turned on its head. For starters, the Dursleys would never have come into the picture. Harry would have been raised in a loving magical family. This would mean he'd have access to all his magical knowledge and abilities from a young age without any suppression. Also, the war against Voldemort would have been fought very differently. Lily and James, being experienced and powerful wizards, would have led the charge. Their presence would have inspired a different kind of hope in the wizarding community. And think about Hogwarts - Harry would be going to school with his parents' support and influence, which could change how he interacts with his classmates and teachers.
Often, their patronuses are shown as a connection between them. For example, in some fanfics, their patronuses can communicate with each other in a way they can't verbally. It's a way to show their deep bond.
James would likely have developed a greater sense of responsibility. After the war, he would understand the importance of protecting his loved ones and the wizarding world. He might be more cautious in his actions. Lily would probably have a new - found strength. She could have seen the worst of the war, and this would have toughened her up. She may also be more empathetic towards those who have suffered, and be more involved in helping the less fortunate in the wizarding world.