There are endless possibilities. Maybe Naruto teams up with some unexpected characters to achieve a greater goal. Or he could encounter powerful forces that were previously hidden from him while in Konoha.
Well, it could go in many directions. Maybe Naruto starts a quest to find a way to bring peace to the ninja world on his own terms. Or perhaps he has to deal with the consequences of leaving Konoha and tries to prove his intentions were pure.
Well, it could be that Naruto leaves because he realizes that Konoha's ways don't align with his ideals anymore after that intense mission. Or perhaps there are hidden threats that force him to go away for the greater good.
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.
Perhaps they are forced to leave due to false accusations or being framed for something they didn't do. This could create a situation where they feel they have no choice but to leave Konoha in order to clear their names and also protect the village from the real threats that might be lurking in the shadows.
Often, a theme is the breakdown of the Naruto - Sasuke relationship. Since Naruto leaves Konoha, it's a huge shift. And the Sasuke bashing can stem from the idea that Sasuke didn't do enough to support Naruto or keep him in Konoha. Maybe Sasuke is shown as being too prideful or cold - hearted in these fanfics. Another theme could be Naruto's search for a new purpose outside of Konoha, away from Sasuke's shadow.
A possible plotline is that Sasuke is being held captive in a different dimension. Naruto has to find a way to enter this dimension. He meets some strange creatures there who can either help or hinder his mission. Naruto uses his skills and wits to overcome the obstacles. Once he finds Sasuke, Sasuke is initially resistant to coming back. Naruto then has to convince him by reminding him of their dreams when they were kids, like changing the shinobi world for the better. Naruto's unwavering belief in Sasuke eventually breaks through Sasuke's defenses and they return together.
Sasuke's reaction would be the most complex. He would be filled with guilt for causing Naruto's death. He would also feel a new sense of purpose, to live up to Naruto's sacrifice. Sasuke might become more withdrawn at first, dealing with the enormity of what has happened. The other ninja from Naruto's generation, like Shikamaru, would be sad but also respect Naruto's choice. They would support Sasuke in his new path, as they understand it was what Naruto wanted. And the younger generation would see Naruto as a martyr, someone who sacrificed for a greater good.
Naruto could use his own growth and strength as an example. He shows Sasuke that he has become stronger not just in power but also in his understanding of the ninja world. He tells Sasuke that together they can change Konoha for the better, that Konoha has changed since he left and is now a place where he can be accepted and contribute. He might also share his own experiences of loneliness and how having Sasuke back would complete him in a way.
Maybe there are some dark secrets within Konoha that he discovers in the fanfic. These secrets could be related to the treatment of certain individuals or something more sinister about the village's leadership. Discovering such things could make Naruto decide to leave in order to distance himself from the corruption or unfairness.
At first, their relationship might be a bit rocky. They both have strong personalities and different ways of doing things. But as they face challenges together, they start to understand and respect each other more. Their bond grows stronger as they rely on each other for survival.
One possibility is that they go on a journey of self - discovery. Away from the constraints of Konoha, Naruto and female Sasuke might explore new jutsu and powers. They could encounter new enemies and allies, and perhaps form a new ninja group that operates outside the traditional shinobi village system.