A third theme could be facing greater challenges. In these fanfictions, the challenges are so big that Luffy can't just rely on his normal, laid - back self. He has to be more serious to overcome them.
A third theme could be self - discovery. As Natsu gets serious, he may also discover new aspects of himself. Maybe he realizes he has more power within him than he thought, or he discovers a different way of thinking about his role as a dragon slayer. This can lead to some interesting character arcs in the fanfiction.
One great 'luffy gets serious' fanfiction is 'The Serious Luffy Adventure'. In it, Luffy faces a powerful new enemy that forces him to drop his usual carefree attitude and strategize. It shows a different side of Luffy's character.
The theme of acceptance is quite common. Fem Luffy often has to be accepted by the other characters in the story. This could be because she's different due to her gender or her slightly different personality traits. Also, the theme of self - discovery is prevalent. As fem Luffy navigates the pirate world, she discovers more about herself, her abilities, and her place in the grand scheme of things.
Another theme is alternate universes. Writers create different scenarios where things could have gone differently in the Naruto world. Maybe Naruto was raised by a different person, or the Akatsuki had different motives. This allows for a lot of creativity and new storylines.
The theme of legacy is quite common. Goku is a legendary figure, and in fanfiction, his legacy - what he leaves behind for future generations - is often explored. Also, the theme of redemption can be found. Maybe Goku made a mistake in the fanfiction's plot, and he has to redeem himself. And the concept of the hero's journey is also there. Goku's path as a hero, with its challenges, growth, and revelations, is a recurring theme in serious Goku fanfiction.
One common theme is cooperation. Given their different backgrounds, they might work together against a bigger threat. Another theme could be understanding. Reiju trying to understand Luffy's simple yet powerful view of the world, and Luffy learning about Reiju's family - centered concerns.
In a lot of luffy and robin fanfiction, the theme of discovery is significant. This could be discovery of new powers, new places, or new aspects of themselves. Their relationship is also often a central theme, whether it's about how they rely on each other in tough situations or how they bring out the best in one another. Another common theme is the idea of facing the unknown. As pirates, they are constantly in situations where they have to deal with the unexpected, and fanfictions play on this, showing how Luffy's courage and Robin's intelligence work together to overcome these unknowns.
Common themes in 'depressed Luffy fanfiction' include the exploration of Luffy's inner demons. He's a complex character, and these fanfictions can dig into parts of him that the original story doesn't always show. For instance, his fear of not being able to protect his crew. Another theme is the impact of failure on his mental state. When he fails to achieve a goal or protect someone, it can lead to depression. And the theme of redemption is also there, as he tries to find his way back to his normal self and continue on his journey towards the Pirate King with new - found determination.
A common theme is the development of Luffy's sword skills. Writers often focus on how he acquires new techniques and gets stronger with the sword. For example, in some fanfictions, he might train under a strict master.
One common theme is friendship. Just like in the original series where Luffy forms strong bonds with his crewmates, in fanfiction with dragons, Luffy often forms a deep friendship with the dragon. They support each other through various difficulties.