She could also become more self - reflective. Nami has always been focused on achieving her dreams of mapping the world. With pregnancy, she might question if she can still pursue that dream while also being a mother. This internal conflict would add depth to her character.
I'm not sure if there is such a specific fanfiction. There are a vast number of fanfictions out there, but this particular concept might be quite rare or not in line with the general tone of the 'One Piece' series. Fanfiction often explores different relationships and scenarios, but this one seems rather out - of - the - ordinary considering the nature of the characters in the original work.
A more emotional plot idea could be that Nami gets pregnant by someone she loves deeply, but that person is lost or in danger. She then has to go through the pregnancy alone, with the support of the Straw Hat crew. The story could focus on her growth as she becomes a mother - to - be and how she overcomes the challenges without her partner.
It could be a sword. In many fanfictions, swords are common powerful weapons. Since the Shinigami is often associated with death and power, a sword with special abilities like being able to cut through spiritual barriers or absorb chakra could be a likely weapon for Naruto to obtain.
In some fanfiction scenarios, if Nami were to side with an enemy, even if it was for a seemingly good reason like trying to protect the crew in a way that Luffy doesn't understand. Luffy has a strong sense of loyalty to his crew and seeing Nami on the 'opposing side' might enrage him. He might feel betrayed and his anger would be a natural reaction.
If there was a 'luffy gets nami pregnant fanfiction', it would likely face a lot of criticism from the 'One Piece' fandom. The relationship between Luffy and Nami in the original work is more of a deep friendship and comradeship. However, if we were to consider such a fanfiction, it could explore how their crewmates would react. Maybe some would be supportive, while others might be shocked. It could also delve into how Luffy and Nami themselves would grow and change as they take on this new role of becoming parents, which is completely different from their usual pirate - hunting and treasure - seeking activities.
I'm not sure if there is such a fanfic specifically. Fanfics can cover a wide range of themes and relationships, but this description seems rather inappropriate. There are many positive and healthy fanfics about Nami and her relationships within the story context that focus on friendship, respect, and teamwork rather than something improper.
Sakura could design her new clothes. Since Sakura has an eye for fashion and also knows Naruto well, she could come up with something both practical and beautiful.
A better title could be 'Nami and Her Captain: A Bond of Trust'. This title focuses on the positive relationship between Nami and her captain, highlighting elements like trust which are important in their interactions within the story.
Well, he could become even more powerful. Maybe he'd use it to defeat stronger enemies like Madara or Kaguya more easily. With a legendary weapon, his status as a hero in the village would be even more solid.