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.
One possibility is that Luffy challenges Shanks to a friendly duel. This isn't about enmity but rather a way for Luffy to test his strength against the man he has long idolized. Shanks, on the other hand, might see this as an opportunity to further train Luffy. He could give Luffy some tips on how to better control his Devil Fruit powers or how to face stronger opponents. There could also be a moment where Shanks offers Luffy some valuable item or information that will help him on his journey to find the One Piece. And of course, the crew of the Straw Hats and Shanks' crew would be there to witness this momentous encounter, and perhaps there would be some friendly exchanges between the two crews as well.
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 might have an epic battle to test Luffy's growth. Shanks could see how much stronger Luffy has become and be proud. Maybe Luffy will show off his new Haki abilities.
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 a fanfiction scenario where Luffy meets Whitebeard, it could be a really epic encounter. Luffy, being the carefree and determined pirate he is, might immediately show his respect for Whitebeard as a great pirate. Whitebeard, on the other hand, would probably be intrigued by Luffy's unwavering spirit. They could end up sharing stories about their adventures at sea, and perhaps Whitebeard would offer some words of wisdom to Luffy. Maybe they would even team up briefly to take on a common enemy, like some other powerful pirate crew that threatened the peace of the Grand Line.
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.
In some fanfictions, when Luffy meets his dad, there could be an emotional moment. Luffy might be surprised at first. His dad could give him some advice on his journey, like how to better face the powerful enemies in the New World. And maybe he'll share some secrets about Luffy's family history that he didn't know before.
In a fanfiction where Luffy meets Dragon, it could be an emotional moment. Luffy might be shocked to learn that Dragon is his father. Dragon could impart some deep wisdom or a special mission to Luffy. Maybe he would reveal secrets about Luffy's past or the world that Luffy didn't know before. It could also lead to Luffy having a new sense of purpose in his journey to become the Pirate King.
Well, Luffy might be completely shocked at first. His father has been this mysterious figure for so long. He could start asking a million questions about his family history, his father's adventures, and why he wasn't around. And his father might be proud to see how far Luffy has come in his own journey, achieving so much and making a name for himself in the pirate world.
When Luffy meets Shanks again in the fanfiction, it might change the story in several ways. For one, Luffy could get new directions or insights from Shanks. This could lead the Straw Hat crew to a new island or a new adventure. Also, Luffy's crew might gain new allies through Shanks' connections. And Luffy's resolve to become the Pirate King could be strengthened even more, which would drive the story forward with more determination.
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.