One possible scenario could be Naruto being constantly ostracized in the village. People might avoid him not just because of the Nine - Tails inside him, but also due to false rumors spread about him. For example, they could say he's a bad omen. This would lead to Naruto feeling extremely lonely and isolated, and he might start to train alone more often, distancing himself further from the possibility of making friends.
Maybe in the fanfic, Naruto is betrayed by those he thought could be his friends. Like Sasuke could be written to have joined Orochimaru earlier and publicly declared Naruto as a nuisance. This would shatter Naruto's hope of having friends and he would become bitter. He might then focus all his energy on becoming stronger, not for the sake of the village or friends, but just to prove himself to those who wronged him.
In this 'Naruto has no friends' fanfic, it could be that Naruto is the victim of a powerful genjutsu that makes everyone around him seem unfriendly. He tries to approach people, but they all act coldly towards him. He doesn't understand why and as time passes, he starts to believe that he is just unlikable. So he withdraws into himself and spends his days observing the village from afar, longing for a connection that he thinks he can never have.
Perhaps in the fanfic, there is a prophecy that says Naruto's friends will be the cause of his downfall. So, Naruto, fearing for his future and the safety of the village, starts to distance himself from them and eventually hates them. Or maybe his friends accidentally cause the death of someone Naruto loves dearly, which makes him unable to forgive them.
One scenario might be related to a failed mission. Maybe Naruto is sent on a top - secret mission that is much more dangerous than anyone anticipated. He could be betrayed by someone he trusts during the mission, leading to his death. Or perhaps there are some unforeseen circumstances, like a strange and deadly curse that gets unleashed during the mission which he succumbs to.
Maybe Naruto gives up because he faces too much criticism in the fanfic world. He might feel that he can't meet the high expectations of the fans.
In this kind of fanfic, one possible scenario could be that Naruto leaves Konoha due to feeling misunderstood. Maybe he has been wrongly accused of something and decides that he can't stay in a place where people don't trust him.
Well, it could be that Rias betrays Naruto for power. Maybe she makes a deal with a powerful enemy of Naruto in order to gain more influence in the ninja world or some other realm. Another possibility is that she betrays him out of jealousy if Naruto has something she desires deeply, like a special technique or a strong bond with someone she wants to break.
In a 'naruto gets pissed off fanfic', one possible scenario could be that Naruto discovers someone has been slandering his friends behind their backs. He would get pissed off and confront the person directly, his eyes blazing with anger.
Another scenario might be that Naruto sacrifices his arm to save someone he cares about deeply. He might have used his arm to block a fatal attack aimed at a friend or a loved one, showing his selfless nature even in a fan - created story.
One possible scenario is that Anko takes Naruto on special training missions in dangerous and unexplored areas. This would not only strengthen Naruto's skills but also build their bond. Another could be Anko helping Naruto deal with the pressure of being the Jinchuriki, perhaps by sharing her own experiences of dealing with difficult things in the ninja world.
In a fanfic, there could be a scenario where Naruto and Superman start off as enemies but then realize they have a common enemy. They then team up against this new threat. During their initial fight, Superman might underestimate Naruto's speed and agility, which are enhanced by his ninja training. Naruto, on the other hand, might be initially shocked by Superman's sheer power. But as the fight progresses, they could come to respect each other's abilities and decide to work together.
Well, perhaps in the fanfic, Naruto has to team up with his friends in a unique way to seal the Juubi. For example, Sasuke could use his Sharingan to help Naruto locate the weak points of the Juubi while Naruto does the actual sealing. And Sakura could use her medical ninjutsu to keep Naruto in top shape during the process.