In my opinion, Remus Lupin can be an interesting character in Harry and Lily Potter fanfiction. He could play a role in helping Harry understand his mother better, perhaps by sharing stories about their time at Hogwarts. Also, Bellatrix Lestrange could be an interesting addition. Imagine her being involved in a plot that somehow involves Lily and Harry, adding a new level of danger and conflict. And don't forget Dumbledore. His wisdom and guidance could be portrayed in new ways in relation to Harry and Lily.
Well, obviously Harry and Lily themselves are very interesting. Harry because we get to see a different side of him when interacting with his mother. Lily is interesting as we can learn more about her personality and her life before Harry was born. Then there's James Potter. In fanfiction, we might see more of his relationship with Lily and how he influenced Harry even from the afterlife. And Snape, his complex relationship with Lily can be further explored in the context of these fanfictions.
James Potter often makes an appearance. Since he was Lily's husband, his relationship with both Harry and Lily is explored in different ways. For example, in some fanfictions, Harry gets to see a side of his father through Lily's memories that he didn't know before.
One interesting plotline is when Lily is given the chance to change the future. In some fanfictions, she has the power to go back in time and make different choices, like whether to marry James or not. Another is when she discovers hidden magic within herself that no one else knew about. This often leads to her having to face new challenges and enemies.
One interesting story could be about Lily Potter's early life at Hogwarts before she met James. Maybe it shows her friendships and how she was developing her magic skills. Another could be a story where Harry Potter gets to time - travel and meet his mother Lily as a young witch. It could explore their relationship in a new way, like Harry learning from her directly about the Potter family secrets.
One common plotline is time - travel. For example, Harry might go back in time and interact with Lily Potter in a way that changes the course of events. Another could be an alternate universe where Lily survives and she and Harry have a different kind of relationship, perhaps more of a mentoring one.
A really interesting concept could be Lily Luna Potter traveling back in time. She could meet her father as a young boy at Hogwarts and have to be careful not to disrupt the timeline. It would be a great way to see how the past and present of the wizarding world interact.
There are fanfictions that imagine Lily's life if she had survived. In these stories, she would be a key figure in Harry's life, guiding him and protecting him in ways that Dumbledore or others couldn't. She might also play a role in the wizarding world's politics, using her intelligence and magical abilities to bring about positive change.
One interesting fanfiction could be about James and Lily's time at Hogwarts before they got together. It might explore how their relationship developed from initial dislike to love. For example, a story could show James maturing from a prank - loving boy to someone worthy of Lily's love.
Maybe in the fanfiction, Harry accidentally enters a parallel dimension where Lily is still alive. Here, Lily discovers that Harry is her future son. She might take him under her wing and train him in a different way of magic, one that was perhaps forgotten in Harry's own time. This could lead to Harry having unique powers and a different approach to dealing with the Dark Arts and his enemies.
There are fanfictions that rewrite the story from Lily's point of view. In these, we get to see all the major events in the Harry Potter series through her eyes. It's really interesting as we can understand her thoughts and feelings during key moments like when she was facing Voldemort. This gives a fresh look at the familiar story.
One possible fanfiction could be about Lily Potter's ghost guiding Harry in a more direct way than in the original books. Maybe she appears to him during his toughest times at Hogwarts, like when he's facing Voldemort in the Chamber of Secrets, and gives him some special advice or magic that only a mother could pass on.