One possible plot could be that Luffy, while on a new adventure in a mysterious island, accidentally discovers a hidden treasure map that leads to a place Shanks has been looking for. Luffy decides to find Shanks and share the map. When they meet, they team up to face the various pirates and obstacles in their way to reach the treasure. Along the way, Shanks teaches Luffy some new combat skills and they strengthen their bond as friends and pirates.
Maybe in the fanfiction, Luffy gets into trouble with a powerful enemy he can't defeat alone. Shanks hears about Luffy's situation and comes to his rescue. After that, they have a long talk about their dreams and how far they've come. Shanks reveals some secrets about the One Piece and the Grand Line to Luffy, which gives Luffy new motivation and a clearer direction for his future adventures.
In this fanfiction, Luffy could be sailing through a dangerous sea when a massive storm hits. His ship is damaged and he's in a desperate situation. Meanwhile, Shanks' crew is nearby and they come to Luffy's aid. Luffy and Shanks reunite and decide to sail together for a while. During this time, Luffy's crew members get to learn from Shanks' more experienced crew. Luffy also has the chance to challenge Shanks to a friendly duel to test his own strength against one of his idols.
In this fanfiction, perhaps Luffy has become much stronger. He might show Shanks his new skills and powers. They could also talk about their adventures since they last met, like Luffy sharing his experiences on different islands.
They could start with a big hug. Then Shanks might tease Luffy about his still - crazy appetite. Luffy, in turn, could show off his new crew members to Shanks.
A powerful new pirate group could be the main antagonist. They might be after the same treasure or territory as Luffy and Shanks. They could have some unique and dangerous abilities, like the ability to control sea monsters. Their leader could be a former crewmate of a well - known and feared pirate, who has his own vendetta against both Luffy and Shanks for some past reasons.
In fanfiction, when Shanks meets Luffy's crew, it could be a very emotional reunion. Shanks might be impressed by how much Luffy and his crew have grown. He could see the strong bonds within the crew and be proud of Luffy for leading them so well.
In the fanfiction, Luffy might show Shanks how much he has grown. He could display his new Haki abilities and his stronger crew. Shanks would be proud of Luffy's progress.
A plot might involve Female Luffy getting into trouble in a new territory and Shanks comes to her rescue. This could lead to a sort of mentorship situation where Shanks teaches her some new skills or gives her valuable insights about the world of pirates. Another idea is that there's a misunderstanding between them at first, like Female Luffy is mistaken for someone who wronged Shanks' crew, and they have to sort it out while also dealing with other pirate groups trying to take advantage of the situation.
One interesting luffy and shanks fanfiction could be about Luffy finally reaching the level where he can have an epic battle with Shanks to prove his worth. In this story, Luffy might show off all the new skills he has learned during his adventures. Another could be a story where Shanks reveals a big secret to Luffy about his family that changes Luffy's perspective. There are also fanfictions where they team up against a common enemy much stronger than any they've faced before.
Well, a plot twist could be that in this fanfiction, Fem Luffy has a special power due to being raised by Shanks. Maybe Shanks unknowingly passed on some of his unique haki abilities in a different way to her. And this power becomes a key factor in her journey. For example, she might be able to use a form of haki that can calm the most violent of sea creatures, which helps her and her crew in many dangerous situations at sea.
One interesting story could be about baby Luffy trying to imitate Shanks' tough pirate ways. He might pick up a little stick and pretend it's a sword, just like Shanks' weapon, and start challenging the other kids on Foosha Village. It's really cute to imagine baby Luffy with his big dreams already starting to form under Shanks' influence.
Another interesting plotline could be related to the prophecy or some sort of hidden danger that only Shanks is aware of. He saves Luffy not just from an immediate threat but from a long - term danger that could have ended Luffy's journey towards becoming the Pirate King. Shanks might have to sacrifice something of his own in the process, like his position or a precious item, to ensure Luffy's safety.