One possible plotline could be that Petunia initially hates James but then gradually discovers his good side. Maybe through some accidental encounters where James shows his kindness and courage, Petunia starts to question her long - held prejudices against him.
Another plotline could involve Petunia getting involved in one of the Marauders' adventures by accident. Maybe she stumbles upon them while they are exploring a secret part of Hogwarts and has to work with them to get out of a tricky situation.
A possible plotline could be that James is a new student and he meets the Evans family. One of the Evans siblings is having trouble at school, and James decides to help. As they work together, they start to form strong friendships. There could be obstacles like bullies or difficult teachers along the way, but through their combined efforts, they overcome them and grow closer as a group.
Well, Petunia can be really well - written. If the author delves into her insecurities and jealousy towards Lily, and then shows how she reacts to James, it can create a very complex and interesting character. For example, a good fanfiction might show Petunia's internal struggle when she sees James' charm and popularity.
One interesting plotline could be Harry, now as Petunia, trying to prevent the Dursleys from being so cruel to the real Harry. Since he has the knowledge of his past life, he might use it to subtly change the family's attitude. Another could be his interactions with the wizarding world in this new identity. He would have to hide his true self while still being involved in some way.
One interesting 'James meets Harry' fanfiction could be where James comes back as a ghost to guide Harry. It could show James sharing his experiences at Hogwarts, his time with the Marauders, and giving Harry advice on dealing with Voldemort. This would add a whole new layer of emotional depth to Harry's journey.
One possible plotline could be a time - travel scenario. Maybe Ginny somehow travels back in time and meets James and Lily. They could form a bond and Ginny could learn a lot about Harry's early life and family history directly from them.
One possible plotline could be Yelena initially being distrustful of the Avengers. Maybe she has been taught to view them as enemies, but as she gets to know them, she realizes they have similar goals. For example, she might find common ground with Natasha's former teammates in their fight against evil.
One interesting plotline could be Luigi and Daisy teaming up to solve a mystery in the Mushroom Kingdom. Maybe there's a strange disappearance of power - ups, and they use their unique skills to figure it out.
One interesting plotline could be Harry somehow traveling back in time to meet Grindelwald in his prime. This could lead to a battle of wits between them, with Harry trying to stop Grindelwald from starting some of his more heinous plans early. Another might be that Grindelwald, seeing Harry's power, tries to recruit him to his side, offering him power and knowledge that Harry has to resist.
One possible plotline could be that Caroline and Hope initially have a misunderstanding when they meet. Maybe Caroline misinterprets Hope's intentions, leading to some tension at first. Then as the story progresses, they discover they have common goals, like protecting their families or the supernatural community they belong to.