Another possible plot is that Lily is brought back to life briefly in a magical experiment gone wrong (or right, depending on how you look at it). Harry then has the chance to bond with her, and they go on a small adventure together within the grounds of Hogwarts, exploring parts of the castle that are filled with memories of her time there.
One interesting plot could be that Harry meets Lily in a time - traveling scenario. He gets to have a conversation with his mother, learning things about his family that he never knew before.
One possible plot could be that Lily is under some dark magic influence which makes her turn against Harry. Maybe a powerful dark wizard has corrupted her mind, leading her to believe that Harry is a threat to the wizarding world that needs to be eliminated.
Perhaps Sirius Black could also be involved. Sirius was Harry's godfather and was very much a part of Harry's life. His presence could add some interesting dynamics, like he could be the one who stumbles upon the magic that makes the meeting possible and then has to deal with the implications of Harry meeting his mother.
One interesting plot could be that Harry and Pansy are forced to work together on a school project in Hogwarts. At first, they dislike each other due to their house differences. But as they spend more time together, they start to understand each other better and discover they have more in common than they thought. For example, they both have a love for magical creatures, though Pansy is a bit more hesitant to show it at first.
One interesting plot could be Harry time - traveling and getting to join the Marauders on one of their pranks at Hogwarts. He might learn some new spells and mischief - making techniques from them.
Another possible plot is that they discover a long - lost secret about Gotham's past together. This could lead them on a journey through the city's underbelly and old, forgotten places, uncovering clues and facing challenges along the way.
A cool plot could be that Minato is brought back to the present for a short time. He gets to meet Naruto's friends and see the village he helped build in a new light. Naruto shows him all the new things in the village, like the new training facilities, and they bond over their shared love for the village and their family.
One interesting plot could be two Narutos from different timelines meeting. They could exchange stories about their battles and growth, and then team up to face a new, powerful enemy that neither could defeat alone.
One possible plot could be that Harry gains Lily's memories gradually. As he gets these memories, he starts to understand his mother in a much deeper way. He might learn about her childhood, her time at Hogwarts, and how she developed her magical skills. This new knowledge could also help him in his fight against Voldemort, as he might discover secrets that Lily knew.
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.
One possible interesting plot could be how the main character deals with the unexpected pregnancy while still trying to pursue her dreams. Maybe she has to balance school and the new responsibilities that come with pregnancy.