Maybe he's frustrated with all the prophecies and his role in the fight against Voldemort. He doesn't want to be constantly pushed into being the hero. He might want some time to figure out who he really is outside of all these expectations. Also, he could be feeling a bit overwhelmed with his studies and the extra - curricular activities like being in Dumbledore's Army. All these things together make him long for some solitude.
The fanfiction might explore his character by showing how he deals with isolation. In the original books, he is rarely alone for long. Here, when he wants to be left alone, we can see how he copes without the support of his friends. It could reveal aspects of his self - reliance that were not as prominent in the original. Maybe he discovers new magical abilities or ways of thinking when he's by himself.
One such fanfiction is 'Alone in the Dark'. In this story, Harry is left alone in Hogwarts during a holiday when all the other students have gone home. He stumbles upon a hidden chamber that contains secrets about his family. As he explores it, he discovers new powers within himself. The story is unique as it delves deep into the Hogwarts' secrets and Harry's self - discovery.
One popular 'Harry Potter left alone' fanfiction might be those where he has to fend for himself in the Muggle world without any wizarding help. For example, he could be exploring his magic in secret while dealing with the challenges of being an orphan in a non - magical environment.
In this fanfiction, Naruto may find himself in a situation where he's being hounded by people for various reasons - some for help, some for his power. He simply wants to be left alone to live a normal life. So he might start to avoid the village and the people in it, seeking refuge in a secluded place. There, he could explore his own thoughts and feelings more deeply, perhaps even learning new skills or abilities on his own, away from the watchful eyes of his friends and the village.
Well, perhaps in this fanfiction, Harry has had enough of the constant battles and drama. He just wants a break from his friends too, not because he doesn't love them, but he needs time for himself. He could find an abandoned cottage and start a simple life there, growing his own magical plants and spending his days reading ancient magic texts that he never had time for before. He's basically trying to find peace away from all the chaos.
It could be someone from the village who doesn't understand Naruto's need for solitude. Maybe a council member who thinks Naruto is shirking his duties and tries to force him back into the spotlight.
Perhaps Harry has a vision or a prophetic dream where he sees himself as a healer, saving lives. This drives him to study hard in his Healing classes at Hogwarts. He also starts to research ancient healing techniques on his own. He faces some challenges, like some people doubting his ability because of his past as 'the boy who lived', but he overcomes them and works towards his goal.
The main antagonist could be an internal one - Harry's own guilt. It's like a dark shadow that follows him everywhere. He wants to be alone to escape from it, but it keeps haunting him. It makes him question his every move and decision, and it's this internal struggle that could be seen as the main 'antagonist' in the fanfiction as it constantly opposes his desire for peace and solitude.
The fandom would be divided. Some fans who are deeply into fanfiction would be disappointed and might feel like a part of their connection to the 'Harry Potter' world has been cut off. However, others who are more focused on the official works might not be as affected. There would likely be a decrease in the variety of fan - created stories, which could limit the creative exploration within the fandom.