James might impress Lily's parents by showing his intelligence. For example, if they discuss a current event or a historical topic, James could offer well - thought - out opinions and insights. He could also show his caring side towards Lily, like how he always makes sure she's okay when they are out together. This would make her parents think he's a great partner for their daughter.
Harry would often be a main character in these fanfictions. Since it's about bashing his parents, his reaction and how he copes with the new view of them is a big part of the story. Another could be Sirius Black. He was very close to James, so fanfictions might explore his feelings towards the bashing of his best friend.
Love is a very common theme. Their love story is often explored in great detail, from the initial dislike to the deep, passionate love they end up sharing. Another common theme is friendship, especially James's friendship with the Marauders and how Lily fits into that dynamic.
Well, I really like 'James Potter and Lily Evans: The Untold Story'. It shows their relationship in a new light, with a lot of character development for both of them. Then there's 'The Lily - James Bond' which is quite interesting as it has a lot of action and adventure while still exploring their relationship. And don't forget 'James and Lily's Secret Moments' which has some really sweet and tender moments between the two.
Petunia could be an important character. She might be grudgingly attending the wedding, still having mixed feelings about Lily's magical world. Her presence could add some tension as she struggles to fit in. And then there's Dumbledore. He could make an appearance and give some wise words of advice to the couple, perhaps about the future challenges they might face together.
One common theme is family love. Since they are family, many fanfictions explore the deep love between Lily, James and Harry. Another theme is sacrifice. Given James and Lily's sacrifice for Harry, it's often explored further in these stories. For example, how their sacrifice influenced Harry's character and actions.
One possible fanfiction could focus on the moments leading up to their death. It might show James trying to protect Lily and Harry until the very last moment. He could be shown using his wand to fend off Voldemort as long as he could, while Lily was huddled in a corner with baby Harry, praying for a miracle.
Guilt and redemption can be a theme too. Snape's actions were often driven by his love for Lily and his guilt over her death. Fanfictions may expand on this, showing how he tries to make up for it in different ways. Also, the theme of loyalty - Snape's loyalty to Lily even after her death is a powerful concept that fanfictions often explore, sometimes by creating scenarios where Lily somehow comes back or is still present in a way that tests Snape's loyalty.
Well, it could lead to a very different story. Harry's childhood and upbringing would be completely changed, and the dynamics of the wizarding world might shift.