Perhaps Naruto accidentally starts a gang in fanfiction because he misinterprets the concept of teamwork. He's all about bringing people together, but some of the people he brings together have their own ideas. They see Naruto's leadership and strength and want to follow him in a more unruly way. Say, he starts a club for ninja training and some of the members start using the skills they learn for not - so - good purposes, like stealing or intimidating others in the village. Before he knows it, they've become like a gang.
Well, it could happen if Naruto was trying to help some outcasts in the village. Maybe he was just being friendly and inclusive, but those outcasts were misfits who had a bit of a 'gang' mentality already. Naruto, being naive in some ways, didn't realize it and his actions accidentally united them into a sort of gang. For example, if he was training with some kids who were always getting into trouble and he taught them some cool ninja moves. They might then use those moves to show off and start getting into more mischief together, gradually forming a gang - like group.
It could be that Naruto accidentally starts a gang when he tries to reform some delinquents. He thinks he can turn them into good ninjas, but they end up taking his teachings in the wrong direction. For instance, Naruto might have given them a sense of purpose and unity, but they twist it. They start wearing similar clothes or markings as a sign of their group, and instead of following the proper ninja code, they form their own rules. This slowly evolves into a gang - like situation.
Well, they might be really embarrassed at first. Naruto could turn bright red and stutter, while Hinata might faint from the shock. Then they would probably avoid each other for a while, until their friends notice the strange behavior and try to get them to talk it out.
Well, Naruto might face a lot of challenges. He could have trouble with the financial regulations in the ninja world. Maybe he would use his unique ninja skills to protect the bank from robbers. For example, his shadow clone jutsu could be used to patrol the bank at all times.
Well, it could lead to some interesting character development. Maybe Naruto realizes he has some new - found feelings for Ino that he hadn't considered before. Ino might also see Naruto in a different light. This accidental kiss could be the start of a new dynamic in their relationship, with other characters noticing the change and reacting to it, like Sakura might get jealous if she has feelings for Naruto or Shikamaru could tease Ino about it.
Well, for starters, the villagers who don't understand the situation would be afraid. This could lead to a rift between Naruto and the people he's always wanted to protect. His friends might also be divided. Some might support him and try to help him reform the gang, while others might distance themselves. The gang itself could also attract the wrong kind of attention from outside forces, like enemy ninja villages. They might see Naruto's gang as a sign of weakness in Konoha and plan an attack. And if the gang gets into illegal activities, Naruto could be held responsible by the ninja council, which could lead to his expulsion from the village if things get really bad.
If Harry accidentally becomes a fanfiction, he could end up with new powers or abilities. Fanfictions often play around with the original characters' capabilities. He might be able to fly without a broom or have some sort of mind - reading power that wasn't in the original books. This would completely change his interactions with other characters and the overall plot.
In a fanfiction where Harry Potter joins a gang, it could lead to a whole new set of adventures. The gang might be involved in some underground wizarding activities, like illegal potion - making or trading in dark artifacts. Harry, being part of it, would be caught in a web of danger. He would have to navigate between his new 'friends' in the gang and his old friends from Hogwarts. This could create a great internal conflict within him as he tries to figure out who he really wants to be and what kind of wizard he wants to grow into.
In such a fanfiction, the reader might be initially terrified when encountering Slenderman and his gang. They could be chased through a dark forest. Maybe the reader discovers a hidden power within themselves that allows them to stand up to the group.
He could seek revenge on those who hurt him. It's a common plot point in stories like this. He might train harder, get stronger, and then take on his enemies one by one.
In such a fanfiction, it could be due to a misunderstanding. Maybe Naruto was forced into a situation where he had to act against the Yugioh world for the sake of his own village. For example, if there was a threat to Konoha that was somehow related to the Yugioh realm and he was given no other choice but to 'betray' them.
Well, it could start with Naruto coming across a strange Pokemon in his world. Maybe a Pikachu somehow gets transported to the Hidden Leaf Village. Naruto, being curious as always, is immediately intrigued by this cute yet powerful little creature. He starts to learn about Pokemon from the knowledge that comes with Pikachu, and gradually becomes a huge fan.