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.
They could be hunted by their former villages. Naruto, with his Uzumaki blood and powerful chakra, and Temari with her wind-based attacks, would have to constantly evade capture. Maybe they'd find a hidden place to hide and train, improving their skills even further. For example, Naruto could learn more about wind - natured chakra from Temari to enhance his Rasengan.
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.
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.
In many fanfictions, a Naruto and Temari marriage can bring about interesting storylines. It could start with their relationship evolving from being comrades in the ninja world. For example, they might bond over shared experiences in battles and protecting their respective villages. Their different personalities, Naruto's exuberance and Temari's more no - nonsense attitude, can create a great dynamic in a fan - written story. This could lead to a series of adventures as a married couple, dealing with the politics of the ninja villages and perhaps even starting a family of their own in the fanfiction world.
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.
In fanfiction, the combination of Naruto, Temari and Obito can lead to some really interesting storylines. For example, they could be on a joint mission where their different skills and personalities clash and then gradually come to work well together. Naruto's determination, Temari's no - nonsense attitude and Obito's complex past could create a lot of drama and character development.
Danzo could be a great antagonist. He always had his own secretive and often unethical plans. He might see Naruto as a threat even if he's innocent and frame him as a missing - nin to get rid of him.
One common theme is redemption. Since Naruto is a missing nin, often the stories explore his path to redeem himself while building his harem. Another theme is power. His new status as a missing nin might give him different powers or ways to use his existing powers in the context of the harem.
Sasuke is often a popular one. In fanfiction, his journey as a missing - nin and potential connection to Akatsuki can be explored in many ways. His power and his complex relationship with Naruto make him a fascinating character to write about in this context.