Their relationship might become more of an equal partnership in terms of strategizing. Usually, Luffy is more about action, but a smart Luffy could contribute intellectually to Robin's plans, making their bond stronger as they rely on each other's skills more evenly.
I'm not sure if there is a specific fanfiction about a female Luffy being pregnant. Fanfiction can cover a wide range of creative ideas, but this might be a rather unique and perhaps not as common concept within the One Piece fanfiction world. It could exist, but it would depend on the creativity and interests of individual fanfiction writers.
Well, in most cases, Luffy would use his unique abilities. He might use his Gum - Gum Pistol to knock out the bad guys. His superhuman strength and speed would allow him to reach Nami quickly and stop the assailants before any harm could be done. Luffy's sense of justice and loyalty to his crewmates are so strong that he would not let anything bad happen to Nami.
Luffy will most likely use his Gum - Gum abilities. He could stretch his arms to grab Nami and pull her away from the abuser quickly. For example, he might use Gum - Gum Pistol to knock out the bad guys who are abusing Nami.
The shared ideology might be another factor. Both Luffy and Dragon seem to oppose the unjust systems in the One Piece world. Luffy wants to bring freedom to the islands he visits, while Dragon aims to topple the World Government which is often seen as corrupt. So in fanfiction, this common ground can be exaggerated to make Luffy more like Dragon.
Well, a plot could revolve around Luffy as a girl having to deal with the expectations of femininity in different islands they visit. Some islands might have strict gender roles, and she has to find a way to balance being true to herself as a fearless pirate while also navigating these cultural differences. And perhaps her crew helps her in different ways to overcome these obstacles.
In terms of character relationships, Luffy's relationship with Usopp could be different. Usopp might be more hesitant to involve her in dangerous stunts or pranks, thinking he needs to be more careful with her as a girl. Also, the relationship with Robin could be enhanced. Robin, being more mature, could act as a sort of mentor to Luffy in matters related to being a female pirate, while still respecting her as the captain. And all the crew members would have to adapt to the new dynamics of having a female Luffy, which would bring about both challenges and new opportunities for growth in their relationships.
A popular one is 'The Protector Zoro'. It details how Zoro's entire focus, aside from his own training and goals, is centered around Luffy. He anticipates Luffy's moves and the potential dangers that come with them. This fanfic really hammers home the idea that Zoro is Luffy's protector, and it does a great job of showing their relationship through the lens of protection.
There are no existing theories about Luffy being able to read poneglyph fanfiction. In the world of One Piece, the focus is on the real - world elements of the story such as the poneglyphs themselves, the various islands, and the different pirate crews. Fanfiction is a separate entity created by fans for their own enjoyment. Luffy's journey is about discovery within the main storyline, like finding out what the poneglyphs really say and how they lead to the One Piece. Reading fanfiction about them doesn't fit into his character or the overall plot.
It could explore her relationship with her crewmates in a new light. Maybe they would be overly protective or have different reactions to her pregnancy. For example, Zoro might be more on guard to protect her.