One possible plot could be that Akainu attacks the Straw Hat's new island, endangering Luffy's friends. Luffy, filled with rage, challenges Akainu. After an intense battle, Luffy discovers a new form of his Gear ability that allows him to withstand Akainu's magma and finally defeat him.
Considering Luffy's character development, he has always been against those who harm his friends and the innocent. Akainu has caused great harm, especially during the Marineford War. If Luffy continues to grow in strength, and if the story progresses in a way that pits them against each other again, there's a chance. But the Marines also have their own ways of protecting their top - ranked officers, so it's a complex situation.
Well, in most cases, Luffy would use his unique abilities. He might use his Gum - Gum Pistol to knock out the bad guys. His superhuman strength and speed would allow him to reach Nami quickly and stop the assailants before any harm could be done. Luffy's sense of justice and loyalty to his crewmates are so strong that he would not let anything bad happen to Nami.
Luffy will most likely use his Gum - Gum abilities. He could stretch his arms to grab Nami and pull her away from the abuser quickly. For example, he might use Gum - Gum Pistol to knock out the bad guys who are abusing Nami.
In some fanfiction concepts, Luffy could overhear a conversation. Maybe some of the villains are talking about their plans regarding Nami or boasting about how they've been treating her. Luffy, with his excellent hearing skills, picks up on this and figures out that Nami is in a bad situation.
In 'Shanks Saves Luffy' fanfiction, Shanks and Luffy are the central figures. However, characters from Shanks' crew could also be involved. They might be there to assist Shanks in the rescue mission or have some sort of back - story related to why Shanks is so determined to save Luffy. Additionally, any new characters created specifically for the fanfiction, perhaps a powerful being who is the root cause of Luffy's danger, could also be main characters in the story.
The dynamic between Luffy and Nami is one of the main attractions. Their friendship and loyalty within the Straw Hat crew are well - known, and seeing Luffy come to Nami's rescue emphasizes that bond. It also shows Luffy's heroic side in a very intense situation, which can be quite exciting for readers.
Fanfiction.net is also a great place to look for 'ace saves luffy fanfiction'. There are tons of One Piece related stories on there. Browse through the One Piece category and look for titles or summaries that mention Ace saving Luffy. You might also want to check out some One Piece fan communities on social media platforms. Sometimes they share links to great fanfictions.
Well, there's a 'ace saves luffy fanfiction' where Ace has to battle his way through a horde of pirates to reach Luffy who is trapped in a cage. Ace's determination and his love for his brother are the driving forces. And then there is this one where Ace actually sacrifices a part of his own strength to break the spell that was holding Luffy captive. These fanfictions often play on the strong emotional bond between the two characters.