In the later part of the plot, there could be a turning point. Maybe Harry realizes that his isolation isn't helping him and that he needs his friends. Or perhaps an external threat arises that forces him to come out of his self - imposed isolation. This could lead to a rekindling of his relationships, and they all work together to face the new challenge stronger than ever before.
Perhaps he's dealing with some sort of trauma. For example, after the many battles he's been through, like the fight against Voldemort, he may be suffering from post - traumatic stress disorder. To cope with this, he isolates himself from others as he doesn't want to burden them or he's just too caught up in his own dark thoughts.
The plot could start with Harry escaping the Dursleys earlier than in the original. He then roams around, trying to find a place to belong. He might stumble upon some hidden magical secrets in the Muggle world that are related to his parents. As he grows, he starts to attract the attention of both good and bad wizards. Some might want to help him, while others see him as a threat because he's an unknown factor, not following the normal wizard upbringing.
Well, if Snape were Harry's dad in this fanfiction, Harry's isolation might take on a different tone. He could be more conflicted. Knowing Snape is his father, a man he had such a tumultuous relationship with before, would make him question his own identity. He might be more withdrawn as he tries to come to terms with this new family truth, and his relationships with his friends might become strained as he feels they couldn't possibly understand what he's going through.
As the plot progresses, Harry might start to realize the true extent of what he's gotten himself into. He could face internal struggles, doubting his decision. Maybe he'll discover some secrets about the Goblet or the tournament that he wasn't supposed to know. This could lead to a whole new set of challenges and adventures, like having to deal with dark magic associated with the tournament that was hidden from the public.
His relationship with the village would also change. The villagers, who have come to rely on Naruto as a hero, would be confused and perhaps a bit scared. Some might feel betrayed that he has isolated himself. But there could also be those who understand his need for solitude and wait patiently for his return.
One possible reason could be the burden of his past. Naruto has faced a lot of hardships and the memories might be overwhelming him, making him want to be alone. For example, the loss of his master Jiraiya might have left a deep scar, and he might feel that isolating himself is the only way to deal with that pain.
In fanfiction, 'Death Himself' can change the power dynamics. If he decides to side with a particular character or group, it can shift the balance of power. For example, if he aids the Order of the Phoenix, they could gain access to knowledge and abilities that were previously unavailable, like the power to truly defeat Voldemort once and for all without sacrificing so many lives. He could also bring chaos if he decides to play games with the characters' lives, creating unexpected twists and turns in the plot.
The 'harry hates the light' concept can be a catalyst for change in the fanfiction world. Maybe it will inspire others to question the long - held beliefs about the 'light'. This could lead to a revolution or a reformation of the magical society in the story. Harry's actions based on his hatred can have far - reaching consequences, such as changing the power dynamics between different magical groups, and all these developments form the plot.
One way the story could develop is through cooperation. The two Harrys could team up to solve a mystery or defeat a common enemy. They could combine their skills and resources, like one Harry being better at Potions and the other at Defense Against the Dark Arts.
In this fanfic, Harry's character would be a blend of vulnerability and strength. On one hand, he's all alone, which makes him vulnerable. But on the other hand, he has to be strong to survive. This duality could lead to some interesting character arcs. For example, he might struggle with trust issues, especially when he finally meets other wizards. He would have to learn to balance his self - taught independence with the need to rely on others at times. And his experiences of raising himself could also make him more empathetic towards other orphans or those who have been marginalized in the wizarding world.