In a fanfiction where Luffy meets Roger, it could be an amazing encounter. Roger might see in Luffy the same spirit of adventure and freedom that he had. He could pass on some hidden knowledge about the One Piece or give Luffy a cryptic hint about the true nature of the Grand Line. This meeting could also inspire Luffy even more, fueling his determination to become the Pirate King. It would be a moment full of emotion and significance for both characters and for the entire One Piece universe.
Well, in such a fanfiction, Luffy might gain some valuable advice from Roger. Maybe Roger could share his experiences about the One Piece and the Grand Line, which would inspire Luffy further in his journey to become the Pirate King.
A potential plot twist could be that Roger is actually a time - traveler. He came from the past to meet Luffy for a specific purpose, like to prevent a great disaster in the pirate world that only Luffy can help with in the future.
In this fanfiction, perhaps Luffy would get some valuable advice from Gol D Roger. Roger could share his experiences about the One Piece and the Grand Line, which might give Luffy new insights on his journey to become the Pirate King.
One possible thing that could happen is that Roger would tell Luffy about the real origin of the Devil Fruits. Given that Roger had explored so much of the world, he might know secrets about these strange fruits that no one else does. This knowledge could give Luffy an edge in his battles and his journey. Another aspect could be that Roger shares his experiences with the ancient weapons. Luffy might then be more aware of the power and danger they pose, which could be crucial in his future adventures.
Luffy traveling to Roger's time would be chaotic. He'd probably try to challenge Roger to a fight right away, seeing as he challenges everyone strong. But Roger would likely see something special in Luffy. Luffy might also introduce some new ideas to that era. Since he's from a more modern time in the story, he could have knowledge about things like different fighting techniques that haven't been developed yet in Roger's time. This could disrupt the balance of power in that era.
Zoro would be deeply affected. He has sworn to follow Luffy and his death would be a huge blow. He might feel like he failed in his duty to protect the captain. He would likely become more withdrawn at first, but then focus on getting stronger to avenge Luffy if there was someone to blame for his death.
It could be a story where Luffy and Gol D Roger meet in a strange place, like an island that exists outside of time. They exchange stories about their crews. Roger tells Luffy about the loyalty and adventures of his own crew, and Luffy in turn shares the unique bond he has with his Straw Hat crew. This interaction could inspire Luffy to further strengthen the bonds within his crew and strive harder for his goals.
Nami would be inconsolable at first. Luffy has always been there to protect her, and his sudden death would leave a huge void in her life. She would probably cry for days. As time passed, she would remember all the things Luffy taught her about courage and believing in oneself. Nami would start to take on some of Luffy's leadership qualities in a way. She would be more outspoken about her plans for the crew and more determined to see their dreams through. She would also keep Luffy's memory alive by telling stories of his adventures and his selfless acts to new people they meet on their journey.