One possible plot is that Naruto, after being abandoned by Team 7, decides to prove them wrong. He could train intensively in a secluded area, learning new and powerful jutsus. Along the way, he might meet some unlikely allies who see his potential and help him grow stronger, both in power and in spirit.
Well, it could start with Naruto being left behind by Team 7 during a mission for some unjust reason. This would shatter his trust in them. As a result, Naruto might start to explore the darker side of the ninja world. He could get involved with some outcasts or anti - village groups. But eventually, through his own strong will and the few friends he still has, he realizes that he doesn't need to follow the wrong path and can make his own way in the world.
In such a fanfiction, perhaps Naruto could become bitter at first. He might feel extremely lonely and start to question his self - worth. This could lead him to go on a journey of self - discovery alone, away from the Hidden Leaf Village that he once called home.
One possible plot could be that Naruto is forced to leave Team 7 due to false accusations against him. Sasuke might then go on a solo mission to prove Naruto's innocence. Sakura, feeling guilty for not standing up for Naruto, decides to train harder to be able to bring Naruto back. And Kakashi, caught between the village's decision and his loyalty to Naruto, tries to find a way to reverse the situation.
Well, it could be about Naruto feeling extremely lonely and betrayed. Maybe his team mates left him for some false accusations or because they were influenced by outside forces. He might then struggle to find his place again, both within the ninja world and in his own heart.
One reason could be that his team discovers some kind of hidden power in Naruto that they fear. Maybe they think he's too dangerous to be around, so they abandon him. Another possibility is that they are influenced by some outside force, like an enemy who convinces them that Naruto is a liability.
It could be Danzo. He's always been a bit of a shadowy figure in the Naruto series. Maybe he sees Naruto as a threat to his power and influence in the village and manipulates the situation so that Team 7 has to abandon him. He would be a great main antagonist as he has the resources and the motives to cause such a rift in Team 7.
A 'Naruto in Team 8 fanfiction' could be about Naruto filling in for a missing member of Team 8. He'd have to adapt to their different fighting styles. Shino could teach Naruto about his bug techniques, and Naruto could teach them some of his Rasengan variations in return. Their mission could be to infiltrate a secret base where Orochimaru is conducting experiments. Along the way, Naruto helps Team 8 members overcome their personal fears and they all grow stronger as a team.
One possible plot could be that Naruto's energetic and determined nature would disrupt the usual dynamic of Team 10. He might introduce new training methods. For example, his love for big, flashy jutsus could inspire Shikamaru to think outside the box in combat strategy, instead of always relying on his shadow jutsu in the simplest way. Naruto could also bond with Choji over their love for food, and they could come up with some food - based jutsu ideas together.
One possible plot could be Naruto being temporarily transferred to Team 10 for a special mission. He might struggle to fit in at first with Shikamaru, Choji, and Ino's dynamic. But over time, he learns their teamwork strategies and they learn from his determination.
In such a fanfiction, perhaps Naruto could be disillusioned with Hagoromo's teachings or power. Maybe he discovers some dark secrets about Hagoromo that lead him to abandon the connection. For example, if Hagoromo's actions in the past were not as noble as they seemed, Naruto, with his strong sense of justice, might decide to part ways.
Well, it could be that Naruto, for some reason, is abandoned in Iwa. Maybe he discovers some dark secrets about Iwa that make the villagers turn against him. He might then have to use his ninja skills and wits to survive and find a way out of the situation.
One possible plot could be that Naruto is found by a group of outcasts. They decide to raise him away from the Hidden Leaf Village. As he grows, he discovers his own unique powers that are different from the normal ninja skills in the village. He then has to decide whether to return to the village that abandoned him or create his own path with his new family.