A frequent theme is sacrifice. Given her fate in the original story, many fanfictions explore her willingness to sacrifice for her family, especially for Harry. Her role as a mother figure, even in flashbacks, is also common. Additionally, the theme of her standing up for what she believes in, whether it's against the Dark Arts or for the rights of Muggle - borns, is often seen in these fanfictions.
One common theme is betrayal. Often, she is betrayed by someone she trusts, which causes her deep emotional pain. For example, a friend might turn against her because of jealousy or a misunderstanding.
Often, a theme is the impact of a dark past on Lily. Maybe she had some traumatic experiences that are now coming to the surface and affecting her present actions. For example, in some fanfictions, her family history might be darker than we thought, and this is causing her to act in ways that are not so typical of the 'good girl' image we have of her. Also, the theme of redemption through darkness can be seen. She might have to go through some dark situations to come out stronger and more self - aware on the other side.
Another theme is her role as Harry's mother. Some fanfictions explore how her love for Harry was so strong even before he was born. They might also show how her actions and decisions, like sacrificing herself for Harry, are further explored and given more context. For example, some fics might show her preparing for motherhood in different ways.
One common theme is growth. You see James Potter grow from a bit of a troublemaker to a more responsible person because of his love for Lily. Lily also grows in her understanding of James. Additionally, the theme of family is important. Their future family, especially with Harry, is sometimes hinted at in the fanfictions. The war against the dark forces is also a theme that often comes up, as it affects their relationship and their lives.
One common theme is their relationship development. It often starts from their initial dislike or indifference to each other, like in the books, and then gradually grows into love. For example, in many fanfictions, James has to work hard to change Lily's perception of him from a bully to a worthy partner.
The theme of growth is often present. Both James and Lily grow as individuals and as a couple in many fanfictions. They learn from their experiences, become more empathetic, and this growth is what cements their relationship in these stories.
In many fanfictions about them, the theme of sacrifice is present. Given the dangerous wizarding world they live in, they might have to sacrifice personal desires or safety for each other. Also, the theme of family is important. Since they end up having a family together, stories often explore how their relationship sets the foundation for the Potter family, and how their love influences their future children, like Harry.
One of the themes is the power of memories. Since Snape's love for Lily was so strong, his memories of her were a significant part of his character. Fanfictions often play with this idea, showing how his memories of Lily influenced his actions and decisions. Another common theme is the struggle between good and evil within Snape. His love for Lily was a force for good, but his association with the Death Eaters was a mark of evil. Fanfiction can explore how this internal struggle was affected by his relationship with Lily.
Another theme is the power of magic in relationships. The Amortentia is a magical potion, and its presence in the fanfiction highlights how magic can influence emotions. It can show how the characters are both drawn to and sometimes scared of the power that the Amortentia represents in their connection.
One common theme is identity. Since she is the daughter of two such important and complex figures, she often struggles to figure out who she is. Another theme is legacy. She has to deal with the legacies of both Snape and Lily, which can be both a burden and a source of strength.