In a fanfiction scenario where Naruto starts the 4th Shinobi War, it would completely change the whole Naruto universe's narrative. Naruto is known for his desire for peace, so if he starts the war, it might be due to some extreme manipulation or a misunderstanding of the situation. For example, he could be tricked by an enemy who has disguised themselves as an ally and convinced Naruto that starting the war is the only way to protect the Leaf Village. This would lead to a situation where all his friends and comrades would be forced to either oppose him or be dragged into a war they didn't want.
Well, one possibility could be that Naruto is somehow influenced by a dark force. Maybe he discovers some dark secrets about the shinobi world that make him believe war is the only way to bring about true change. He might start by attacking the Five Great Nations, thinking he can overthrow the existing power structures and create a new, more just world.
Sasuke would likely be conflicted. On one hand, he and Naruto have a deep bond, but on the other, Sasuke has his own ideas about justice. He might try to stop Naruto at first, reasoning with him. If that fails, he could be forced to choose a side, either to support Naruto's cause if he believes there's some merit to it, or oppose him to protect the shinobi world as he knows it.
The story would take a very dark turn. Allies would become enemies, and Naruto would be seen as a villain. His friends would be divided, some might try to understand his reasons while others would fight against him immediately.
In this fanfiction, Naruto might be banished due to false accusations. When he starts his village, he could attract other shinobi who were also wrongly treated in their own villages. They would bring with them different techniques and cultures. Naruto's village could then become a place of innovation in ninjutsu. For example, they might combine different elemental jutsus in new ways. The village would also have a strict code of honor that values truth and loyalty above all, as Naruto has always been a symbol of those values.
The story could also develop with Harry facing opposition. There might be a powerful wizard or a group that wants to maintain the status quo and sees Harry as a threat. They could try to stop him by any means necessary, including using dark magic against him. Harry would then have to find ways to defend himself and his cause, perhaps by learning new spells or getting help from unexpected sources like the centaurs who are also often marginalized in the wizarding world.
Perhaps Midoriya starts the civil war because he discovers a conspiracy within the hero ranks. Some powerful heroes are misusing their power for their own gain, and when he tries to expose them, they turn against him. So, he has no choice but to fight back. His friends and those who believe in his cause join him, and it turns into a full - scale civil war within the hero community.
In some fanfictions, Naruto could potentially be depicted as a 'war machine'. Fanfiction often takes creative liberties with characters. Some authors might explore a darker or more militaristic side of Naruto, where his powers are used in a very aggressive, war - like manner. However, this is a departure from his more typical characterizations in the original series.
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 also be that the fanfiction provides a form of escapism for her. The Naruto world is full of action and adventure, but the fanfiction can take it to another level. She might enjoy reading about alternate versions of events or getting a deeper look into the emotional lives of the characters. In some fanfictions, there could be more focus on her own personal growth and self - discovery, which might be appealing to her.