In many 'clementine x louis lemon fanfic', there is a theme of sacrifice. One might be willing to sacrifice something for the other, like a personal goal or safety. There can also be a theme of redemption. Maybe one of them has made mistakes in the past and through their relationship with the other, they find a way to redeem themselves.
A common theme is their relationship growth. It could start from being strangers or just acquaintances in the group and then develop into a deep, romantic relationship. Another theme is survival. Given the post - apocalyptic world they are in, many fanfictions show how Clementine and Louis work together to survive, like finding food and shelter.
I'm not sure of any specific 'clementine x louis lemon fanfic' off the top of my head. But you could try searching on Tumblr. There are often fanfic communities on Tumblr where people share and recommend their favorite works. You can search using relevant tags like #clementine #louislemon #fanfic and see what pops up.
A common theme is friendship. Since Clementine and Gabe are the main characters, their friendship is often explored, like how they support each other.
Love and friendship are often common themes. Writers might explore how Violet and Clementine's relationship develops over time, from initial acquaintance to a deeper bond.
Love and passion are very common themes. Since it's a 'lemon' fanfiction, there's often a focus on the physical aspect of their relationship, which is expressed through passionate encounters.
One common theme is friendship. For example, Clementine might befriend a lemon - like creature and they go on adventures together. Another theme is discovery. Clementine could discover a new use for lemons, like in a story where she finds that lemons can power a special machine. Also, the theme of transformation can be present. Maybe Clementine turns into a lemon - scented being for a short time due to some magical event in the fanfiction.
Another common theme is friendship and loyalty. Their relationship is central, and they are often shown being loyal to each other no matter what. In some fanfics, one of them might be in danger, and the other will go to great lengths to save them, highlighting their strong bond of friendship.
One common theme is power struggle. Clementine often finds herself in situations where she has to either gain power or fight against those with more power in the Overlord universe.
Survival is a common theme. Given the nature of the source material, many fanfics depict baby clementine trying to survive in a harsh world. Another theme is friendship. She often forms bonds with other characters.
A common theme is mentorship. Lee acts as a mentor to Clementine in the original story, and this is often explored further in fanfiction. For example, how he teaches her survival skills and moral values. Another theme is family - like bond. They form a close connection that resembles a father - daughter relationship in many stories.