One interesting fanfiction concept could be that Lily Potter's ghost is trapped in a sort of limbo between the living and the dead because of the powerful magic that was involved in her sacrifice. In this limbo, she has to complete certain tasks to fully pass on. These tasks could be related to protecting Harry and his friends. As she tries to complete these tasks, she discovers new aspects of the wizarding world and its magic that she didn't know when she was alive.
Perhaps in a fanfiction, Lily Potter's ghost has a special connection to the magic of love that still exists in her ghostly form. She uses this connection to heal the wounds of those who have been affected by the war. For instance, she could help Neville Longbottom overcome his insecurities by showing him visions of his parents and how they fought bravely. This would not only strengthen Neville but also have a positive impact on the overall morale of the students at Hogwarts.
One popular type of Lily Potter fanfiction might focus on her time at Hogwarts before she met James. It could explore her friendships, her studies, and how she dealt with the challenges of being a young witch in a magical school. For example, a story could show her in her Potions class, working hard to master difficult spells and potions, and forming a study group with her closest friends.
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.
There could also be fanfictions that focus on Lily Luna Potter's family life. How does she interact with her parents, Harry and Ginny? What about her relationship with her siblings? Fanfiction might explore her growing up in a post - Voldemort wizarding world, dealing with the expectations that come with being the daughter of the famous Harry Potter.
One plot idea could be that Lily's presence changes Harry's upbringing completely. Instead of growing up with the Dursleys, he has a loving home with his mother. Maybe she starts teaching him magic early on, which gives him an edge when he enters Hogwarts. This could also lead to a different dynamic with his friends, as he might be more confident and skilled from the start.
It adds to the universe in multiple ways. Firstly, it humanizes Lily more. We get to know her as a person, not just as Harry's mother. It can also show how the events in her life were connected to the larger events in the wizarding world. For instance, her relationship with Snape might have had an impact on the war. And it can create a more complete picture of the Potter family's history, which enriches the overall Harry Potter universe.
Well, 'The Lily Potter Chronicles' is a fanfiction that I think is quite good. It focuses on Lily's life before she met James and her own adventures in Hogwarts. Then there's 'Lily and the Forbidden Magic' which has Lily stumbling upon a very dangerous and powerful magic that she has to deal with. Also, 'Lily's Love and Loss' is a story that really shows the emotional side of Lily in the context of the Harry Potter world.
It can change the dynamic between characters. For example, Hermione with Lily's traits might be more nurturing towards Harry, which could change the way their friendship works. She could also influence Ron in a different way, maybe being more of a guiding figure for him.
One idea could be a crossover where Harry Potter accidentally travels to the world of Clark Kent. He could be discovered by Clark, who is intrigued by this strange boy with magical powers. They might team up to fight a common enemy that is threatening both the wizarding world and Metropolis.
Another fanfiction could focus on Peeta being a Muggle - born wizard. He discovers his powers later in life, similar to Harry's discovery. Peeta's experiences in the Hunger Games could give him a unique perspective on facing challenges in the wizarding world. He might use his charm and ability to manipulate people's emotions (from his Capitol days) in a different way in Hogwarts.
One idea could be a crossover where Fenrir from the Harry Potter universe somehow gets transported to the realm of Loki. Loki, being the trickster, might see Fenrir as a tool for his own schemes. Harry Potter, perhaps in a quest to stop some dark magic related to Fenrir, ends up following him and has to deal with Loki's antics as well.