One possible plot could be that Lily Luna Potter discovers a hidden magic within Hogwarts that has been long forgotten. Maybe she stumbles upon a secret chamber where an ancient spell is stored. With the help of her friends, she tries to figure out the spell's purpose and how it might be used for good in the wizarding world.
It could be a dark wizard who has infiltrated Hogwarts' staff. This wizard might be secretly manipulating events and students for his own dark purposes. He could be using his position to spread dark magic teachings and trying to turn students against each other, all while Lily Luna Potter starts to suspect something is wrong and tries to expose him.
A possible fanfiction could involve Lily Luna Potter and her time - traveling adventures. She accidentally stumbles upon a time - turning device and gets sent back to the time of the first Wizarding War. There, she has to be careful not to disrupt the timeline while also trying to learn from the events of that time to prevent a similar future catastrophe.
Lily Luna Potter could play a key role in a fanfiction as a mediator. For example, in a situation where different wizarding factions are on the verge of war due to a misunderstanding, she uses her unique perspective, being part of the Potter family but also a new generation, to bring about peace and understanding.
Fanfiction about Severus Snape loving Lily Luna Potter can be really touching. Writers might show Snape's lingering love for Lily manifesting as a protectiveness over her daughter. It could also explore how Snape's memories of Lily are intertwined with his interactions with Lily Luna. These stories can add depth to the already rich Harry Potter universe by exploring the unspoken emotions and what - ifs.
One great example could be a fanfic where Lily Luna is constantly being shadowed by her overprotective family members as she tries to explore the magical world on her own. For instance, when she wants to participate in a dangerous but exciting magical tournament, her family tries to stop her at every turn. This creates a lot of conflict and also shows the depth of their love for her in an overprotective way.
One common theme is the transformation of James. He starts as a bit of a bully but then changes to be a better person for Lily. Another theme is the friendship group. Their friends, like the Marauders, play important roles in their relationship. For example, Sirius might encourage James to pursue Lily or Remus gives advice on how to understand her better.
One possible plot could be that James Albus and Lily Potter are facing a new mystery at Hogwarts. Maybe they discover a hidden chamber that no one has found before and inside it are secrets about their family's past at Hogwarts. They then have to figure out how to deal with these revelations while also keeping up with their studies and normal Hogwarts life.
The main characters are obviously James Albus and Lily Potter. They are likely to be the central focus of the fanfiction, with their adventures and experiences at Hogwarts being the main storyline.
The overprotective theme can add a lot of drama. For example, it can create conflict between Lily Luna and her family members. If she wants to take risks and they won't let her, it drives the story forward as she tries to break free or convince them.