Kakashi would be in a difficult position. He has always been like a mentor to both Naruto and Sasuke. With Naruto leaving, he would feel like he failed in some way. His relationship with Sasuke would become more complex as he tries to make sure Sasuke doesn't also leave while dealing with his own feelings about Naruto's departure.
Sakura would be extremely affected. Instead of constantly worrying about Sasuke leaving, she'd be focused on Naruto. She might feel guilty that Naruto left because of Sasuke. Her relationship with Sasuke would also change as she might blame him in some way for Naruto's departure.
Konoha's power structure could be affected. Naruto is one of the strongest shinobi in the village. Without him, the village might be more vulnerable to attacks from other villages or threats. They would need to quickly find ways to fill the gap in their defenses.
Konoha would initially be in shock. Naruto is a hero to many in the village, and his sudden departure with Itachi, who was once considered a traitor, would cause a lot of unrest. The villagers might start to question the leadership of the village, wondering why Naruto left and if there was something they could have done to prevent it.
For Hinata, it would be a dream come true. Her relationship with Naruto would take a huge step forward. She would likely be overjoyed and more confident. Naruto, on the other hand, might face some mixed reactions from his friends. Some might be surprised but supportive, while others might question this sudden shift. Sasuke would probably be a bit confused at first. His relationship with Naruto has always been unique, and this change could make him wonder about his place in Naruto's life.
One possible plot development could be Naruto leaving to find a way to prevent Sasuke from ever wanting to leave in the first place. He might embark on a journey to discover the root cause of Sasuke's hatred and try to resolve it from afar. This could lead to Naruto meeting new characters who have insights into the Uchiha clan's past and Sasuke's state of mind.
For Naruto, it would be a big shock. He's always seen Sakura as an important part of the team. He would probably feel guilty, thinking he might have done something wrong. Sasuke might be more reserved in his reaction, but deep down, he would also feel the loss. Kakashi would be worried about her safety. The other ninja in Konoha might start to question the unity of the village if someone like Sakura, who was so well - known, left. And the young ninja who looked up to Sakura would be disappointed and might even lose some motivation in their training.
His relationships with his friends like Sasuke and Kakashi would also be affected. Sasuke might understand Naruto's decision on some level, having also left the village before. Kakashi, on the other hand, would be worried about Naruto. He might try to find him and bring him back. This could create some tension between Naruto and Kakashi as Naruto tries to assert his independence.
Sasuke might be more understanding. Given his own experiences of leaving Konoha, he could respect Naruto's decision. However, he might also secretly plan to keep an eye on Naruto from afar to make sure he is safe.
First of all, Naruto and Sasuke's relationship would take a hit. They have this intense connection in the original story, and this sudden act by Naruto would make Sasuke feel like Naruto has abandoned their relationship. For Ino, she would be thrown into a new situation. She may have had her eyes on Sasuke before, but now Naruto has kissed her. This could make her reevaluate her feelings for both of them. As for the other characters, they would be shocked. Shikamaru might be especially intrigued as he's a close friend of Ino. He would probably try to figure out what's going on in Naruto and Ino's heads, and this could also create new interactions and relationships among the group.
With his family - like figures in Konoha, such as Iruka, the relationship would be put to the test. Iruka would probably be heartbroken but also hope that Naruto is doing what he thinks is right. In Iwa, Naruto might find a new mentor - like figure who could teach him different things compared to what he learned in Konoha. This new relationship could shape his ninja path in a whole new way.
This type of fanfiction concept is really out of the ordinary. Naruto's character is built on his values of friendship, loyalty, and his dream of becoming Hokage. Killing Sasuke would mean betraying all of that. However, in a fanfiction, the author might be exploring the 'what - if' scenario. For example, what if Sasuke's actions against Konoha were so heinous that Naruto felt he had no choice? But still, it's a far - fetched and very different view from the original Naruto we know.