Another plotline could be that Naruto is a ghost from the very beginning of the story. He doesn't know he's dead and tries to live his normal life as a ninja. But strange things start to happen around him. People can sometimes sense his presence but not see him clearly. As the story progresses, he slowly realizes he's no longer alive and has to come to terms with it while also trying to protect the village he loves from threats that only a ghost might be able to detect.
One possible plotline could be that Naruto dies during a great battle, like against Kaguya. But his spirit remains because he has some unfulfilled desires, like seeing the village fully at peace. So, as a ghost, he tries to influence the living to achieve that peace.
A possible plotline could be that Calypso, with her alluring powers, tries to tempt Naruto away from his path of becoming Hokage. But Naruto, with his strong will, resists and instead tries to show Calypso the importance of having a noble goal. Another plotline might be that Naruto and Calypso team up to fight a powerful entity that is causing chaos in both their worlds.
One possible plotline could be Naruto using his new position as a daimyo to bring about political reform in the ninja world. He might try to end the long - standing feuds between different ninja villages by leveraging his power.
A possible plotline could be Orochimaru's redemption. He realizes the error of his ways and joins Naruto in protecting the ninja world. He could use his vast knowledge of jutsu and forbidden arts to help Naruto against new threats.
One plotline could be Naruto starts in his own world, discovers a portal to the Pokemon world, and decides to explore it. He might start as a novice Pokemon trainer and quickly rise in the ranks using his ninja skills.
One plotline could be that Naruto is chosen by Poseidon to be his champion in the human world. He is given special powers to protect the seas and their secrets from those who would misuse them. Naruto, with his determination, uses these new powers to fight off evil forces that are threatening the ocean's balance.
One plotline could be Naruto starting from the bottom in the wrestling world. He's underestimated because of his small stature or his goofy personality, but he quickly rises through the ranks with his unique fighting style that combines ninja moves with wrestling holds.
One plotline could be that Aphrodite takes an interest in Naruto because of his pure heart. She decides to bestow some of her powers on him, which gives him a new ability related to charm or attraction. This could be used in his battles, not in a traditional sense of a weapon, but more like a way to disarm his opponents mentally. For example, he could make his enemies hesitate or become distracted by his newfound allure.
In a 'naruto is a alien fanfiction', a plotline could be that Naruto is the last of his alien kind, and there is a powerful enemy that is after the secrets locked within his DNA. As he tries to protect himself and those he loves, he discovers new powers related to his alien side. He also has to deal with the prejudice from some in the ninja world who fear his alien nature, all while trying to use his new - found powers for good and save the day.
One possible plotline could be Naruto being transported to a Spartan world. He has to prove himself among the Spartans. Maybe he starts as an outcast because he's different, but then he shows his amazing ninja skills and earns their respect. Another plotline could be that Spartan warriors are brought into the Naruto world, and Naruto has to train them in chakra control. It would be a mix of two different fighting styles and cultures.
Well, a plotline could be that Naruto is transported into Zeref's body. He has to figure out how to control Zeref's powers and deal with the people who are after Zeref. As he does this, he tries to introduce his own ideas of friendship and loyalty to those around Zeref. Maybe he even tries to find a way to end Zeref's curse of immortality using his ninja knowledge. It would be a complex story of adaptation and change.