One common theme is adventure. Since Luffy is an adventurer in One Piece and Lucy has her own adventures in Fairy Tail, it's natural for their fanfics to involve them going on exciting quests together.
Yes, there are quite a few out there. You can start by looking on popular fanfic websites like Archive of Our Own. Just search for 'luffy x lucy heartfilia' and you'll find a variety of stories with different plotlines and writing styles.
A third theme is self - discovery. Her anger makes her re - evaluate who she is and what she's capable of. This can lead to her exploring different aspects of her magic, her relationships, and her place in the guild or the magical world at large. It's a way for the authors to show Lucy growing and evolving as a character.
Another theme is the exploration of magic. Lucy has her celestial magic, and the OC usually has some form of unique magic as well. The fanfictions often explore how their different magics can work together or clash. It's interesting to see how the authors play with the magic system in the Fairy Tail universe to create new and exciting storylines for Lucy and the OC.
One common theme is power adaptation. Since Lucy is from Fairy Tail and enters a different world in crossovers, she has to adapt her magic powers. For example, in a crossover with a sci - fi world, she might have to find new ways to use her celestial magic.
Another theme is the support of her friends. In many of these fanfictions, when Lucy is hurt, her Fairy Tail comrades come to her aid. It emphasizes the strong bonds within the guild and how they care for each other.
One common theme is brotherhood. Since they have a strong bond as brothers in the original story, fanfics often explore this relationship further. For example, they might show how they support each other through difficult times.
One common theme is adventure. Since Luffy is all about exploring and finding treasures, a lot of 'luffy x reader fanfic' will have the reader joining him on these grand adventures. Another theme is friendship. The stories often develop the relationship between the reader and Luffy as a deep friendship that might turn into something more. And of course, there's the theme of the sea and pirate life, which is central to the 'One Piece' universe that Luffy is from.
One common theme is brotherly love. Since they are brothers in the One Piece universe, fanfics often explore the depth of their love and loyalty for each other. Another theme is growth. They both grow as characters, and fanfics may show how their relationship helps in that growth. For example, Luffy might become stronger because of Ace's influence.
In many 'robin x luffy fanfic', the theme of protection is present. Luffy is always ready to protect his crewmates, including Robin. And Robin, in her own way, also tries to protect the crew and Luffy. Their relationship in the fanfics also often reflects the theme of loyalty. They are loyal to each other and to the crew. This loyalty is what makes their relationship so endearing in the fanfics and is a key element that the writers like to explore.
One common theme is friendship. Luffy and Chopper have a very special bond in the original series, and fanfics often explore and expand on that. They might write about how they support each other during tough times on their adventures.