Yes, in some fanfictions, Luffy can be more like Dragon. Luffy and Dragon both have a strong sense of justice. Luffy wants to become the Pirate King and free the oppressed islands, which is similar to Dragon's goal of overthrowing the World Government to create a more just world. Also, they both possess great leadership. Luffy leads his crew, and Dragon leads the revolutionary army.
It might be full of adventure. Luffy would still be eager to explore the seas, but now with Vivi by his side. Vivi could use her knowledge of the world and diplomatic skills to help the Straw Hats in different situations. Their marriage could also bring a new dynamic to the crew, with everyone having to adjust to having a princess as part of the captain's family.
A well - written 'Pregnant Luffy Fanfic' would have to be very creative. It would need to find a way to incorporate this unexpected concept into the One Piece universe in a believable way. Maybe it could involve some kind of magic or strange果实 (fruit) power that causes this situation. It would also have to stay true to Luffy's character, with his naivete and determination still shining through.
Well, in a My Hero Academia fanfiction with Luffy, the story would take a whole new turn. Luffy's dream of becoming the Pirate King doesn't really fit into the hero - villain dynamic of My Hero Academia, but that's what would make it so exciting. His crewmates could be translated into some sort of hero team. His ability to stretch and his Gear techniques would be a mystery to the people in that world. He might even try to recruit some of the My Hero Academia characters to his non - existent pirate crew, just for the fun of it.
If they were brothers in a fanfic, their adventures would be full of humor too. Imagine Luffy trying to eat Naruto's ramen and Naruto getting all protective. They'd travel to different worlds, maybe even visit the One Piece world's islands and the Hidden Villages in Naruto's world. Their different personalities would create interesting situations. Naruto is determined and a bit hot - headed, while Luffy is carefree and always hungry. Together, they'd face many challenges and make new friends along the way.
The wedding would probably be a huge and chaotic affair. There would be pirates from all over coming to celebrate. Luffy's friends like the Straw Hat crew would be there, of course. There would be lots of food and drink, especially meat for Luffy. The venue might be on an island they've visited before, like Sabaody Archipelago or even on the Thousand Sunny.
In fanfiction, their life could be full of adventures. Luffy would still be eager to explore new islands, and Hancock would support him with her powerful abilities. They might have a home on Amazon Lily where Luffy could visit between his voyages. Hancock would also introduce Luffy to the unique culture of her people, and Luffy would share his tales of the Grand Line with the Kuja tribe.
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.
In fanfiction, Luffy often shows his leadership by making quick decisions in battle. For example, he might decide on a sudden change of strategy that surprises the enemy and gives his crew an advantage. He also stands up for his crew members no matter what, which is a key aspect of being a good captain.