One possible plotline could be that Naruto discovers a hidden jutsu or artifact that grants him immortality. He then has to deal with the consequences of living forever, like seeing his friends and loved ones age and die while he remains the same. Another could be that an enemy tries to steal his immortality, leading to a great battle.
It could be Orochimaru. Since he has always been obsessed with immortality and power, he might see Naruto's new - found immortality as something he wants to steal or study. He could use his dark jutsus and his army of followers to try and capture Naruto.
In online literature," mortals becoming immortals " was a very common storyline. Under normal circumstances, the protagonist was an ordinary person at the beginning, but through continuous cultivation, battles, and fortuitous encounters, he gradually obtained extraordinary strength and abilities, and finally became a god. In this process, the protagonist had to overcome all kinds of difficulties and challenges, constantly improving his strength and realm in order to reach the goal of becoming an immortal.
In some novels, after the protagonist became an immortal, he would face challenges and tests of a higher level. He needed to work hard to reach a higher realm. For example, in the "Mortal Cultivation Legend", the main character Han Li had become an Immortal through constant cultivation and battle. However, he still needed to face the challenges and tests of higher level cultivators in order to reach a higher realm.
In general," mortals become immortals " was a very popular storyline in online literature. It reflected people's yearning and pursuit of surpassing themselves and pursuing a higher realm.
While waiting for the TV series, he could also click on the link below to read the classic original work of " The Legend of Mortal Cultivation "!
I think the whole of Team 7 would be in full support. Sasuke might return to the village and support Naruto as he sees Naruto's growth and leadership potential. Kakashi would also be there to guide Naruto as he steps into the role. Additionally, the people of Konoha who have seen Naruto grow from an outcast to a hero would be very likely to support him as their new Hokage.
Perhaps Naruto becomes a nukenin in order to protect a secret that could endanger the village if it were to be exposed. He leaves the village to keep this secret away from those who might misuse it. In his journey as a nukenin, he could develop new jutsu in isolation, away from the constraints of the village's training methods.
Well, one possible plot could be Naruto facing various challenges within the village that require the leadership of a Hokage. He might have to deal with political unrest, new threats from outside, and also find ways to improve the lives of the villagers. For example, he could start new training programs for the younger generation to make them stronger shinobi.
In a fanfic where Naruto becomes an assassin, he might use his ninja skills in a more stealthy and lethal way. His signature jutsus like the Rasengan could be modified for assassination purposes. For example, he could make it smaller and more concentrated to strike vital points precisely.
In a 'Naruto becomes the Batman' fanfic, Naruto might start adopting Batman's methods. He could become more stealthy and rely on his intelligence more. For example, he might use gadgets similar to Batman's utility belt, like smoke bombs or grappling hooks. Also, his approach to justice could change. Instead of his usual straightforward ninja battles, he might start planning more strategically, much like how Batman plans his crime - fighting operations in the dark alleys of Gotham.
If Harry becomes a Naruto fanfic, he might start trying out Naruto - style ninja techniques in the wizarding world. For example, he could attempt to use chakra - like magic to enhance his spellcasting speed or power. It would be a really interesting crossover concept.
Maybe the plot could revolve around Naruto getting influenced by a powerful and evil entity. This entity could corrupt his mind, making him believe that the only way to achieve true peace is through domination. So, he would begin to gather power, using his skills and charisma, but for the wrong reasons. He would form his own group of followers, who also believe in his new 'world order' ideas, and start a war against the existing shinobi villages.