Naruto's character might become more cynical as a missing - nin. He's been rejected by the village he loved, so he could lose some of his naivete. He might also become more of a lone wolf, relying on his own strength rather than the power of friendship like he used to. Sasuke, however, could start to soften. Away from the influence of Orochimaru and his revenge - driven past, he may see the value in Naruto's way of thinking more. For example, he might start to care about the well - being of others outside of his own goals.
As missing - nin, Naruto may develop a more stealthy side to his character. He was always loud and in - your - face as a Leaf shinobi, but now he has to hide and avoid detection. This could lead to him becoming more calculating in his actions. Sasuke, in turn, may explore his Uchiha heritage more deeply. He might discover new powers related to the Sharingan or the Uchiha clan's secrets that were not accessible to him while he was in the village. This could change his perception of his place in the shinobi world and his relationship with Naruto, as they both have different yet important lineages.
A great fanfiction idea could be that Sakura becomes a missing nin after an incident in the village. Naruto and Sasuke, who have their own issues, must now work together to find her. Along the journey, they realize how much they need Sakura in their lives and also discover some secrets about the village that made Sakura leave. This would be a story of self - discovery and friendship.
One possible fanfiction could be about Sasuke becoming a missing nin again. Naruto and Sakura, now more powerful, set out to find him. They face many challenges on their journey, like dealing with other villages that want Sasuke for their own purposes. Naruto still believes in saving Sasuke from the darkness that led him to become a missing nin in the first place.
One common plotline is that they team up against a new, greater threat that neither the Hidden Leaf nor any other village can handle alone. Since they are missing - nin, they have more freedom to operate outside the normal shinobi rules. Another plotline could be their journey to discover the truth about the shinobi world and the secrets that were hidden from them when they were part of their respective villages. They might also encounter other missing - nin and form a sort of alliance with them, either for mutual protection or to achieve a common goal like overthrowing a corrupt system in the shinobi world.
Kimimaro could be an interesting missing nin character to explore in fanfiction. He was a tool for Orochimaru, but had his own internal struggles. You could write about his life before fully becoming a missing nin, his loyalty to Orochimaru despite his own deteriorating health, and what might have happened if he had broken free from Orochimaru's control. Another character could be Nagato. Before he became Pain, he had experiences that could be considered as leading towards a missing - nin - like existence. His views on peace and his use of the Akatsuki could be delved into in the context of a missing nin story.
In many of these fanfictions, the danger they face as missing - nin forces them to communicate on a deeper level. Hinata, who has always been shy around Naruto, becomes more assertive in expressing her feelings. Naruto, in turn, becomes more protective and understanding of Hinata. They grow together through the various challenges like fighting off other ninjas who are after them.
In many such fanfics, Naruto's character often becomes more vulnerable yet also stronger in a different sense. His pregnancy makes him rely on Sasuke more, but at the same time, he is determined to still be a great ninja. Sasuke, on the other hand, becomes more nurturing. He steps up to protect Naruto and the unborn child, showing a side of him that was not as evident before.
Sasuke is often a popular character in such fanfictions. His initial departure from the village makes him a prime example of a missing - nin. Writers like to explore his journey further, what he experiences outside the village, and how his relationships change.
If Naruto and Temari were missing nin in a fanfiction, it could start with a misunderstanding. Naruto might be framed for a crime he didn't commit and Temari, believing in his innocence, decides to help him escape. They then have to live on the run. Along the way, they meet other outcasts and form a sort of rebel group. Naruto's ability to make friends easily and Temari's strong leadership skills could be the driving force behind this new group's growth.
Perhaps the missing nin discovers new abilities within the Rinnegan that no one else has. They might be able to combine different paths in unexpected ways. For instance, using the Animal Path to summon creatures and then enhancing those creatures with the power of the Asura Path. This would make their summoned beasts more powerful and difficult to defeat in combat.
Naruto might be more distrustful of the Hidden Leaf Village. Since he's being raised by a missing - nin, he would hear different perspectives that might make him question the village's motives and actions.