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.
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 cause a temporary break in their friendship. Naruto might be angry at Sasuke for being so careless. Sasuke would be desperate to fix things. This accident could also make Sasuke more determined to master his abilities so that he never endangers Naruto again. And Naruto, seeing Sasuke's remorse, might start to see a more vulnerable side of him, which could strengthen their bond in the long run.
One potential consequence is copyright issues. If the fanfiction uses elements from a copyrighted work without permission, the creator could face legal trouble. Another consequence might be a negative reaction from the original work's fan community. For example, if it doesn't stay true to the characters or the spirit of the original, fans might be critical. Also, it could have an impact on the creator's own reputation, especially if the accidentally created fanfiction contains offensive or inappropriate content.
The relationship between the Naruto universe and the Yugioh universe might be severely damaged. There could be a rift that affects not only the characters directly involved but also the overall balance between the two fictional worlds. Maybe there would be crossovers of characters trying to fix the situation or make things worse.
One consequence would be a major shift in the power balance in the One Piece world. The Marines would be severely weakened, and pirates might become more bold. Another consequence could be that Naruto would become a huge target for both the remaining Marines and other powerful forces in the One Piece world.
The consequences would be disastrous. Xenomorphs are extremely aggressive and dangerous creatures. They would likely start attacking the people in Naruto's world. Villages would be in chaos as they try to fend off these alien threats. Naruto would probably feel a great sense of guilt for creating such a menace.
The most immediate consequence would be the reaction from Naruto's friends. Sasuke, for example, would likely go on a quest for revenge. He has a deep bond with Naruto and would not let his death go unpunished. Sakura would also be devastated and might lose faith in the idea of peace between the villages.
The Akatsuki would surely be affected. They would lose one of their members, which could disrupt their plans. Also, it might change the way other characters view Naruto. Some might see him as a more formidable threat, while others might see him as a hero for taking out a dangerous enemy.
Well, one consequence could be that Draco feels extremely guilty. He might try to make it up to Harry in various ways, like helping him with his studies secretly. In some fanfictions, this accident could also lead to a change in their relationship dynamic, from enemies to something more complex, like reluctant allies.
If Naruto dies at birth in fanfiction, it would have a huge impact on the story's positive themes. Naruto was a symbol of perseverance and the ability to overcome one's past and hardships. His death would mean that those themes would be lost. Also, the Akatsuki's plans regarding the Nine - Tails would be disrupted. They might turn their attention to other 'jinchuriki' more quickly. And characters like Iruka, who played an important role in Naruto's life, would have a completely different story arc as they would not have Naruto to mentor and befriend.