One common theme is friendship. Given Luffy's nature of making strong bonds with people, fanfictions often explore how he and Marco could form a deep friendship. Another theme could be adventure. They are both from the 'One Piece' world which is full of adventures, so fanfictions might create new and exciting adventures for them to go on together.
One great 'One Piece Luffy x Marco fanfiction' is 'The Unlikely Bond' on FanFiction.net. It really delves into how their different personalities could interact in unique ways. It has some really interesting plot twists and character development for both Luffy and Marco.
Growth is a prevalent theme. As they go through various battles and experiences in the fanfictions, they grow both as individuals and in their relationship. Their understanding of each other and their own abilities develops. Additionally, the theme of brotherhood is strong. They are like brothers in the crew, and this brotherly love is often a central focus in these fanfictions.
Well, in a high school fanfic of Luffy and Nami, their friendship (or potential romance) could develop in various ways. Luffy might drag Nami into his zany schemes, such as organizing a school - wide pirate - themed event. Nami would reluctantly go along, but then find herself enjoying it more than she thought. And as they spend more time together, they start to understand each other better. Luffy would learn about Nami's dreams and support her, while Nami would be there to keep Luffy in line, at least a little bit.
One possible scenario in this fanfiction could be that Ace and Marco are facing a powerful and unknown enemy in a spooky, haunted island. The island is filled with strange noises and dark shadows. Ace's fire powers seem to be ineffective against this new threat as it keeps disappearing and reappearing. Marco, with his phoenix abilities, tries to scout from the air but gets caught in some sort of dark mist. They have to rely on each other and their friendship to overcome their fear and find a way to defeat this mysterious foe.
One of the key themes could be loyalty. In a possessive relationship in this fanfiction, Ace and Marco might show extreme loyalty to each other. They could be possessive because they don't want to lose what they have in each other. Another theme might be sacrifice. Given their personalities in One Piece, they might be willing to sacrifice a lot for the other in this possessive dynamic.
There are indeed. Some fanfictions might focus on their adventures together in a new storyline that deviates from the original manga. Others could explore their relationship in a more emotional and character - development - centric way. It really depends on what you're interested in.
One common theme is adventure. They might go on new quests together. Another could be friendship that slowly develops into something more. And sometimes, there's the theme of protecting each other in dangerous situations.
Often, 'One Piece Kid x Fem Luffy fanfiction' has a focus on character development. Fem Luffy might develop a more assertive side when dealing with Kid, and Kid could become more empathetic. It also can bring out different aspects of their Devil Fruit powers in relation to each other, like how they could combine their abilities in battles or use them to overcome obstacles in their journey together.
One common theme is adventure. Since they are part of the Straw Hat crew in One Piece, fanfictions often put them in new and exciting adventures together. Another theme is growth. Luffy and Robin both grow as characters, and fanfictions explore how they influence each other's growth. For example, Luffy's optimism might help Robin overcome her past traumas.