Nami could also be a common character. She might help Luffy manage the financial aspects of his admiral duties, as well as use her navigation skills to assist in any navy - related voyages. And of course, she'd be there to keep Luffy in check when he gets too carried away.
Well, one unique feature is the role - reversal or role - expansion. Luffy, who is known for his carefree pirate ways, is now in a position related to the admirals. It creates a contrast. For example, in some fics, he has to enforce laws which is completely different from his normal 'break - the - rules - to - do - what - is - right' attitude.
One great 'luffy admiral fanfiction' could be the one where Luffy teams up with an admiral to face a common, extremely powerful enemy. It shows an unlikely alliance and how they overcome their differences in ideology to fight for the greater good.
Well, of course, Luffy is always one of the main characters. And then there's usually an admiral, like Akainu or Kizaru. They often start as antagonists to Luffy but then the story might develop their relationship in different ways.
One interesting plot could be Luffy in an alternate universe where he becomes an admiral earlier in his journey. He might use his unique leadership style and devil fruit powers in new ways to uphold the navy's justice while still maintaining his core values of freedom and friendship.
Well, one possible future for them in Marine fanfiction could be that they form a special unit. Ace with his fire power, Luffy with his rubber abilities and Sabo with his skills would be a formidable team. They could be sent on special missions to deal with the toughest pirates. This way, they are still following their dreams of adventure while being part of the Marines.
A marine who has a special ability or talent that the crew lacks. Maybe a marine who is really good at deciphering ancient texts or has a unique form of martial arts. They would be attracted to Luffy's crew because of their freedom - loving spirit. And once they join, they could use their skills to help the crew in their adventures, whether it's finding a hidden treasure or fighting against a powerful enemy.
There's a 'admiral luffy fanfic' called 'Luffy's Admiral Training'. In this fic, Luffy decides to take on some aspects of admiral - like discipline and strategic thinking - while still being his goofy self. It's an interesting take on how he could grow in different ways. Also, 'The Admiral Luffy: A Different Path' shows a world where Luffy becomes an admiral from the start and how it changes the One Piece universe.
In some fanfictions, female Luffy might be portrayed as having the same adventurous spirit as the original male Luffy. She could be fearless in the face of danger and always eager to explore the Grand Line. However, being a female in the Marines' world might bring some unique challenges. For example, she may have to deal with more discrimination in a male - dominated organization like the Marines. But she would still hold onto her dreams and values, just like the Luffy we know.