Charlotte Pudding could be a likely candidate. She has a complex personality. She's initially deceptive but later shows her true self. Luffy might be attracted to her vulnerability and the good side of her that emerges. And Pudding could be drawn to Luffy's honesty and his ability to see the best in people.
Charlotte Lola could be another option. She has a more independent streak compared to some of the other Charlottes. She left Big Mom's crew on her own terms. Luffy might respect her for that. And in a fanfiction, they could meet during some pirate - related adventures and find that they have a connection. Their marriage could symbolize a new beginning for both of them and their associated groups.
He could face powerful sword - using pirates. Since Luffy now has a sword, he would attract the attention of other sword - masters in the pirate world. These opponents would test his new - found sword skills and force him to improve quickly.
Perhaps in the fanfiction, Luffy marries a Charlotte because of a deal. Maybe to save his crew or to gain access to some important information or power. Initially, it's just a practical arrangement. But as they start living together and facing challenges side by side, they develop real feelings for each other. The story could also include how the other members of the Straw Hat Pirates and the Charlotte family react to this union. Some might be supportive, while others might be skeptical at first but later come around as they see how happy Luffy and the Charlotte are together.
One possible plot could be that Luffy somehow ends up in the Charlotte family's territory. He might be intrigued by their unique devil fruit powers and food - based abilities. He could start making friends or rivals within the family, and his carefree nature might disrupt the family's more traditional and hierarchical structure.
The kidnapper could be a former ally who has turned against Luffy. Maybe they've been corrupted by power or some other force. They believe that by kidnapping Luffy, they can take over the Straw Hat Pirates or get their hands on valuable resources that Luffy has access to.
Power dynamics play a part too. Luffy has his own unique powers as a rubber man and Charlotte has her own abilities within the Charlotte family. How they use their powers in relation to each other, whether in cooperation or in conflict, can create really exciting storylines. Also, the themes of loyalty and betrayal that are common in the One Piece world often seep into luffy charlotte fanfictions, adding depth to the characters and the overall plot.
Nami could be a main character. She would be very worried about Luffy and try to find him. She might use her navigation skills to track down Law's ship. And she could be the one to try and negotiate with Law for Luffy's release.
The Black Hood is a likely candidate. Since he has a history of causing trouble in Riverdale, he might kidnap someone to send a message or continue his reign of terror. He could target Cheryl, for example, thinking she's a symbol of the wealthy and corrupt in the town.
Orcs would be a likely kidnapper. They have a long - standing enmity with the elves, and Legolas being an important elf, would be a valuable captive. They could either want to torture him for information or use him as a bargaining chip with the elves.
It could be a rival team's coach or a jealous player. They might see Kuroko as a threat to their success and decide to kidnap her to keep her out of important games. For example, if there's a big championship coming up and they know Kuroko's skills are crucial for her team's victory.
It could be the Marines. They've been after Luffy for a long time, so it's possible they finally manage to capture him in this fanfiction.