It can also have a positive effect on the plot in some ways. It could force the other characters to become more independent. They might develop new skills or relationships in the absence of Harry's influence. And when Harry finally decides to re - engage, it could lead to a big reunion or a new level of understanding among the characters.
Well, it could create a lot of tension. If Harry ignores everyone, it might lead to misunderstandings. His friends might feel left out or hurt, which could drive a wedge in their relationships. This in turn can change the whole dynamic of the group. For example, they might not be as united when facing challenges, and it could also lead to some of them trying to figure out why Harry is acting this way, adding a mystery element to the plot.
It could also speed up the plot in a different way. If Naruto ignores everyone, some villains might see this as an opportunity to attack. Since Naruto is usually a key defender, his withdrawal could lead to more immediate threats to the village. This would force the other characters to step up in different ways than they normally would. They might have to form new alliances or develop new powers quickly to fill the void left by Naruto's ignoring behavior.
Well, perhaps in this fanfiction, Harry has been through so much that he decides to isolate himself from everyone. He might be tired of the constant danger and the expectations placed on him. So he shuts out his friends like Ron and Hermione, and just focuses on his own inner journey, maybe to discover some new magic that he believes can only be found in solitude.
His closest friends like Ron and Hermione would probably be the most affected. They are used to having Harry around and relying on him. His sudden ignoring would leave them confused and worried.
It could lead to a lot of conflict. His friends might try to reason with him, but if he's too angry, he might push them away. This could split their group apart, creating new alliances or just leaving Harry isolated for a while. His anger can also attract the attention of the wrong sort of people, like those who want to use his emotional state for their own gain.
It can add a lot of tension. For example, if Lily is used to Harry being friendly and then he suddenly starts ignoring her, it can create a sense of mystery and unease. Readers will be curious to find out why he's acting this way and will keep reading to uncover the truth.
Perhaps Percy has received some bad news or a prophecy that makes him think that by ignoring everyone, he can protect them. So he distances himself from his friends and family, and the fanfiction could explore how they react to his sudden cold - shoulder. They might try to figure out what's wrong with him and how to bring him back to his normal self.
The other students at Hogwarts would also be affected. For example, Neville, who looks up to Harry. If Harry ignores everyone, Neville might feel lost. Ginny, who has a special connection with Harry, would be deeply hurt. And the teachers like Snape, who has a complex relationship with Harry, would also be impacted. Snape might be secretly glad at first, but then realize that Harry's isolation could be a sign of a bigger problem in the wizarding world.
His childish behavior can also add a sense of vulnerability to the plot. Since he's acting like a child, he might not be as capable as he usually is. This could make the threats in the story seem more menacing. For instance, if he's facing a powerful dark wizard but is acting childishly, it heightens the tension because the reader knows he's not in his best form to fight back.
It can distort the theme of friendship. In the original, friendship is a powerful force. But in antisocial fanfiction, when characters turn away from their friends, it undermines this important theme.
Perhaps Naruto has a new power that he doesn't understand and it's making him act strange. This power could be related to some ancient jutsu. As a result, he starts to ignore everyone because he's afraid of hurting them or because he's constantly in a trance-like state due to the power's influence. His friends would then try to figure out what's wrong with him and how to bring him back to normal.