Not having read any Libby and Willard Kraft fan fiction, I can only guess. Maybe their relationship could be a central theme, like how they met, overcame difficulties in their relationship, or grew together. Another theme might be their individual growth and development within the context of their story.
As I'm not familiar with this particular fan fiction, generally speaking, themes can also be related to the setting they are in. If they are in a fantasy world, themes of magic, power, and the fight between good and evil could be present. If it's a more modern - day setting, themes of career, family, and social issues might be explored in the fan fictions about them.
There are so many fan fictions out there, and without more information about Libby and Willard Kraft, it's hard to point out particular ones. You could start by looking for groups dedicated to the genre or theme related to them and then explore the fan fictions shared within those communities.
There could be. Try searching on social media platforms too. Sometimes fans will share their fan - fictions there, or at least point you in the right direction to find some Libby Kraft Sabrina fan fiction.
FanFiction.net also has a lot of fan - fictions. You might need to dig a bit deeper by using different combinations of the names in the search bar. Sometimes, the stories might not have all three names in the title but still be relevant to the characters.
Friendship is a very common theme. Writers often explore how Molly and Libby support each other through various situations.
One of the common themes is redemption. Characters may try to make up for their past mistakes. For example, a character who has done something bad in the original show might seek redemption in the fan fiction. Also, exploration is a theme. They might explore new parts of the world they are in. And power struggles are also common, as different characters or groups vie for control.
Romance is a very common theme. Fans often write about falling in love with a band member. Another theme is friendship, like becoming friends with the band. Adventure can also be a theme, for example, going on a wild tour with the band in a fictional story.
As I don't know the exact 'Libby Day novels', it's hard to say. But if they are mystery novels, common themes could be solving a crime, uncovering secrets, and dealing with the past.
The struggle against the dark side is a significant theme. Given the time period they were in, with Voldemort rising to power, many fan fictions show how the Marauders fought or prepared to fight against the dark forces. It adds a sense of danger and heroism to the stories.
Love is a very common theme. Many anderberry fan fictions explore the romantic relationship between the characters.
One common theme is the celebration of their music. Fan fictions often revolve around their iconic songs and how they can be part of a story. Another theme is the relationship between the band members. Writers like to explore their friendship, creative collaborations, and occasional disagreements. Also, there is the theme of their impact on the world of music and pop culture.