Yes, there are quite a few. Some focus on an alternate universe where Lily Potter survives. You can find them on popular fanfiction websites like Fanfiction.net or Archive of Our Own. These stories often explore how her survival would change the entire Harry Potter storyline, from Harry's upbringing to the fight against Voldemort.
Well, one plotline could be that Lily uses her influence to change the way Hogwarts is run. Since she was a brilliant witch, she might introduce new spells and teaching methods. For example, she could start a special class for students to learn advanced defensive magic earlier.
Fanfiction.net is a great place to start. It has a large collection of Harry Potter fanfictions, and you can easily search for ones related to 'Alive Lily'. Just type in the relevant keywords in the search bar, and it will show you a list of available stories.
One great fanfiction where Lily is alive could be 'The Lily Potter Chronicles'. It shows a different take on Harry's life with his mother around. She gets to guide him in his magical studies in a more hands - on way compared to just the memories in the original story.
In such a fanfiction, the story could take many turns. Maybe Lily would be able to protect Harry in a more direct way. For example, she could use her magic to shield him from Voldemort's attacks throughout his years at Hogwarts. She might also be involved in the fight against the Death Eaters, using her skills and knowledge.
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.
Lily could also influence the OC's perception of Harry. Since she is Harry's mother, the OC might see Harry in a different light, perhaps as someone who has a strong family support system. This could either attract the OC more or create some insecurities depending on her own background. In the story, Lily might also be involved in bringing Harry and the OC together, like inviting the OC over for family events or introducing them through her wizarding connections. This would add a different layer to their relationship development.
A lot of fanfictions in this category might explore different timelines. For instance, some might have them survive the initial attack and then change the course of the wizarding war. They could use their combined magical powers to turn the tide early on. So, look for stories that focus on these aspects when you search for fanfictions about them being alive.
One key element could be the relationship dynamic between Harry and the OC. Since Lily Potter is alive, it might change Harry's character development in a way that affects this new romance. Maybe he has more family support, which gives him more confidence in the relationship. Also, the OC's character needs to be well - defined, with her own backstory, goals, and personality traits that would attract Harry.