A possible plot is that Fem Luffy accidentally gets involved in one of Smoker's investigations in a new island. She initially seems like a hindrance to him, but as the story progresses, they find out that there is a much larger conspiracy at play that involves both the Marines and some powerful pirate groups. They have to work together to expose the truth, and during this time, a strange friendship starts to form between them.
Perhaps in the fanfiction, Fem Luffy's ship gets damaged near Smoker's base. She and her crew are in need of help. Smoker, being the by - the - book Marine, is hesitant at first. But when he sees that Fem Luffy is different from the typical pirates he has encountered, he decides to offer assistance. This leads to a series of events where they interact more, and Fem Luffy shows Smoker the value of freedom and following one's heart, which makes Smoker question some of his long - held beliefs about pirates.
Perhaps there could be a plot where a magical artifact is lost and it has the power to change the balance in both universes. Naruto and Fem Luffy both hear about it and start their own quests to find it. But then they realize that working together is the best option. They face many challenges, like different types of enemies and environmental obstacles, as they search for the artifact.
One idea could be that Fem Luffy, with her Mythical Zoan power, discovers a hidden island full of ancient secrets related to her Zoan form. She has to face challenges there that test her newfound abilities.
One interesting plot idea could be that Luffy, in her female form, discovers that her Mythical Zoan powers have a special connection to Law's devil fruit powers. Maybe they accidentally trigger a combined power that creates a unique adventure for them. They could go on a journey to find a way to control this new power while also exploring their growing feelings for each other. For example, during battles, they find that they can combine their abilities in unexpected ways, which helps them defeat stronger enemies and brings them closer together.
Their relationship could start as one of mutual distrust. Smoker sees Fem Luffy as a pirate and Fem Luffy sees Smoker as a Marine who might try to arrest her. But as they face common enemies and challenges, they gradually start to respect each other. For example, if they are both trying to stop a mad scientist from creating dangerous weapons on an island. Through this shared goal, they see each other's strengths and the relationship moves from distrust to a sort of grudging respect.
Another plot could involve a common enemy. Maybe a new powerful pirate group attacks both Amazon Lily and Fem Luffy's friends. Hancock and Fem Luffy have to work together to defend. During the battle, Hancock realizes Fem Luffy's strength and leadership skills, and they gradually fall in love as they fight side by side. After the battle, they start to explore their relationship more deeply.
Maybe they find a strange fruit that has the power to temporarily swap their abilities. This leads to some comical and also interesting situations. Luffy tries to use Robin's powers to reach for things in a more elegant way, and Robin attempts to use Luffy's stretching ability to explore hard - to - reach places. It also makes them understand each other's perspectives better.
One idea could be that Luffy joins the Fairy Tail guild and his rubber powers amaze everyone. He might participate in a guild - wide competition and use his unique abilities to win in unexpected ways. For example, stretching to reach far - off targets or bouncing around the arena to dodge attacks.
A possible plot is that Luffy discovers a time - traveling device at Marineford. He then uses it to go back in time briefly to prevent some of the worst events from happening, like Ace's capture. Or perhaps Luffy has a dream where he is given advice by a long - dead pirate on how to win the battle at Marineford. This advice then helps him make better strategic decisions during the real battle. He could also meet a mysterious character at Marineford who has the power to heal all the wounded, which changes the whole course of the battle.
One idea could be Luffy learning new and extremely powerful Haki techniques during the time skip that no one has ever seen before. This would make him even more of a force to be reckoned with when he returns to his crew.
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.