In fanfic, baby Luffy is often depicted as extremely curious. He's always eager to explore his surroundings, whether it's the small village on Dawn Island or the beach. His curiosity is so strong that it sometimes gets him into trouble, but he doesn't seem to mind.
It's possible that the baby's parents are from a rival pirate crew. In the 'luffy finds a baby fanfiction', this could lead to a lot of drama as Luffy has to decide whether to return the baby to its potentially dangerous family or keep it safe with his own crew. Or perhaps the baby's parents were victims of a powerful and evil force, and Luffy feels compelled to protect the baby from the same fate.
One possible plot could be that Luffy and Nami accidentally end up taking care of a baby during one of their adventures. Maybe they find the baby on an island they land on. Luffy, being his carefree self at first, tries to play with the baby like it's a new crewmate. Nami, on the other hand, is more practical and starts looking for supplies to take care of the baby. They face challenges like finding proper food for the baby and protecting it from other pirates or threats on the island.
The Marines could be antagonists. They might see the baby as a threat or something that needs to be taken away from Luffy and Nami's crew. Maybe they think the baby has some connection to a dangerous pirate or revolutionary. The Marines would try to capture the baby and arrest Luffy and Nami for having it.
In this fanfiction, perhaps Luffy might take on the role of a protector. He could be very confused at first, not knowing how to handle a baby. But then, his kind heart would lead him to try his best to keep the baby safe and find its family.
In fanfiction, if Luffy and Nami had a baby, it would be an interesting combination. The baby might inherit Luffy's carefree and determined nature. Luffy's rubber abilities are a result of the Devil Fruit, and it's not clear if they could be passed on, but if so, the baby could have some unique physical traits. Nami is highly intelligent and good with navigation and finances. The baby could potentially grow up to be a great navigator like Nami while also having Luffy's adventurous spirit, making them a formidable presence in the One Piece world.
In such a fanfiction, perhaps the story could be about how Luffy and Nami's relationship evolves to a more romantic and family - centered one. Maybe they have adventures while taking care of their baby. Luffy might teach the baby about freedom and the joys of exploration, while Nami would be more practical, teaching the child about finances and navigation.
One great 'baby Luffy fanfic' could be 'Baby Luffy's Adventures on Dawn Island'. It's really cute as it shows Luffy's innocent and fearless nature even as a baby. He gets into all sorts of little scrapes on the island that are both funny and heart - warming.
Since Luffy has a tanned complexion and Robin is fair - skinned, the baby could have a unique skin tone that's a blend of the two. The baby's build could be small and cute at first but with the potential to grow strong like Luffy. It might also have Robin's long fingers, which could be a sign of future dexterity.
In terms of raising their baby, Luffy would be the fun - loving parent. He'd let the baby do things like climb the ship's mast or play with the other crew members. Nami would be more concerned about the baby's future. She'd start teaching the baby about maps and weather patterns early on. They would also teach the baby the importance of friendship, which is a big part of the Straw Hat crew's values. And of course, Luffy would share his love for food with the baby, while Nami would make sure the baby doesn't waste any resources.