Well, it could be about Naruto being constantly pestered by someone, like a villager who doesn't trust him because of the Nine - Tails inside him. So he just wants to be left alone to train and prove himself. He might go off to some secluded place in the forest to practice his jutsu without any distractions.
In the 'naruto leave me alone fanfiction', it could be that Naruto has a falling - out with his friends. Maybe they keep interfering in his life, thinking they know what's best for him. Naruto, feeling suffocated, decides to leave. He embarks on a journey where he discovers new powers within himself. Along the way, he meets some old enemies who have also changed and they end up having a mutual understanding of each other's need for space and self - discovery.
Maybe the main antagonist is actually a group of people within Konoha. They might be some of the elders who think Naruto's isolation is a threat to the village's stability. So they send people after him to bring him back, which Naruto sees as an intrusion and they become the antagonists in his eyes.
In a 'naruto fights alone fanfiction', it could be that Naruto is on a mission in a foreign land where he has no support. The local ninjas are all against him for some reason. He has to use his Nine - Tails chakra in a more discreet way as he can't afford to go all - out and draw too much attention. He might befriend some local animals or spirits who help him in a more indirect way, like giving him information about the enemies' weaknesses.
Maybe Naruto is alone because all his friends are with their families. He might be reminiscing about his past Christmases, or perhaps he's on a mission during Christmas and feels a bit lonely while seeing the festive cheer around him.
It could be about Naruto choosing a solitary life after all the battles. Maybe he decides to live alone in the forest to find inner peace away from the chaos of the ninja world.
It could be about a character named Asasuke who is constantly pestering another character, and that character wants Asasuke to leave them alone. Maybe there are some misunderstandings between them that lead to this situation.
Perhaps in this fanfiction, Minato and Kushina leave Naruto because they are cursed. They fear that the curse will harm Naruto if they stay close. So, they go into exile. As Naruto grows up, he starts to discover clues about his parents' real reason for leaving and sets out on a quest to find them and break the curse. This could lead to many adventures and character - development moments for Naruto.
Maybe in this fanfiction, Naruto is alone after the war because the villagers still don't fully trust him despite his heroic deeds. He then embarks on a journey to find a new purpose, away from the village that he once fought so hard to protect. Along the way, he discovers new powers within himself and also meets some unlikely allies who help him come to terms with his situation.
Maybe Naruto has had enough of the chaos in the ninja world. He could be tired of all the battles and political intrigue. So, he decides to find a secluded place, perhaps a small island, where he can live in peace and train by himself without any distractions.
In this kind of fanfiction, one possible plot could be that Naruto loses all his friends due to some unforeseen and tragic events. Maybe he makes a great sacrifice to save the village, but in the process, he becomes estranged from everyone. His friends might misunderstand his actions, or he could be cursed in a way that drives people away. Eventually, he dies alone, with his heroic deeds forgotten by most.
Maybe it's due to power differences. Naruto has his own set of unique and powerful jutsu. In the Fairy Tail universe, magic is the main form of power. He could feel that his powers are not being utilized or respected in the right way. He might also be frustrated with the lack of understanding of his ninja skills among the Fairy Tail members, so he chooses to leave.