Family is a very common theme. These fanfictions often explore the relationship between Natsu, Lucy, and their daughter. How they raise her, protect her, and pass on their values.
Love is also a prevalent theme. Not just the love between Natsu and Lucy which is the basis for their daughter's existence, but also the love the daughter has for her parents and the love she finds in her own relationships, be it friendships or potential romantic interests. This love often serves as a driving force for her actions and decisions throughout the story.
One common theme is friendship turning into love. They start as friends or classmates in high school and gradually fall for each other.
One common theme is adventure. Since they are from the Fairy Tail guild which is all about going on quests, many fanfictions continue this trend. They go on new adventures together, facing powerful enemies and discovering new magic.
The theme of unrequited love can also be common in some 'lucy loves natsu fanfiction'. Maybe at the start, Natsu doesn't realize Lucy's feelings or is too focused on other things like his next adventure or his training. This creates a lot of tension and drama in the story, as Lucy tries to hide or express her feelings while Natsu is oblivious.
One common theme is romance. Since Natsu and Lucy have a great chemistry in the original series, in hotel fanfictions, the hotel setting often provides a more intimate and private space for their relationship to develop, like in 'A Romantic Hotel Retreat' where they finally confess their feelings in a cozy hotel room.
One common theme is the exploration of their unspoken feelings. Often, in the series, their relationship is somewhat ambiguous, and fanfiction allows for that to be explored more deeply with the kiss as a climax of those pent - up emotions.
Power and growth is another theme. As they face challenges together, they become stronger both magically and as individuals. Their relationship also strengthens during these times. They rely on each other's powers and learn to work in harmony, which is often explored in fanfictions.
One common theme is the growth of the relationships. In many fanfictions, Natsu and Lucy start as comrades in Fairy Tail and slowly develop romantic feelings. The same goes for Gajeel and Levy. They learn to understand each other better, overcome differences, and build a strong bond. Another theme is adventure. Since they are part of a magical guild, their relationships often develop during various quests and battles. For example, they might protect each other during a dangerous mission, which deepens their connection.
One common theme is friendship. Since Lucy and Natsu are guildmates in Fairy Tail, their friendship is often explored in fanfics. Writers might show how they rely on each other during battles or how they share their secrets. Another theme is adventure. As members of Fairy Tail, they go on many adventures together, and fanfics often revolve around these quests, like exploring a new, mysterious land or finding a powerful magic item.
Well, family is a big theme. Since Lucy is pregnant with Natsu's child, it's about them starting their own family within the Fairy Tail family. Love and protection are also common. Natsu would likely be very protective of Lucy and the unborn child, showing a deeper side of his love. And sometimes, there's the theme of sacrifice, like Lucy might have to sacrifice some of her adventures for the sake of the baby and Natsu might have to change his carefree ways to be more responsible.
One common theme is friendship. Their relationship as friends is often explored, like how they trust and rely on each other. Another theme is adventure. They usually go on some kind of adventure together, whether it's to defeat a new enemy or to discover something new. For example, in many fanfictions, they set out to find a lost magical item.