Another idea is that Naruto and Hinata go missing - nin to explore a dark power that is threatening the ninja world but is being ignored by their village. They sacrifice their status in the village to do what they think is right. Their relationship deepens as they face the difficulties and moral dilemmas together.
One popular storyline could be about a missing nin who has a change of heart and tries to secretly protect the Hidden Leaf. Another might involve a missing nin with a unique power that the various ninja villages are trying to either recruit or eliminate. There could also be stories where a missing nin is on a quest for redemption after being wrongly accused.
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.
Sasuke Uchiha is often a popular S - rank missing - nin in fanfiction. His defection from Konoha makes him a prime candidate for such stories. Orochimaru is another. His thirst for knowledge and power led him to become a missing - nin, and his abilities and mysterious nature are great fodder for fanfiction. Then there's Kakuzu. His unique jutsu and long life as a missing - nin give writers a lot to work with.
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.
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.
Another interesting angle is a missing - nin who discovers a long - lost ninja art outside the village. They then use this new - found power to either seek revenge on those who drove them out or to protect the ones they love who are still in the village. For example, they could master a unique form of shadow - based jutsu that was lost in history.
One popular storyline is where Naruto's Kyuubi powers play a role in his relationship with Hinata. For example, Naruto might use his Kyuubi - enhanced strength to protect Hinata from a powerful enemy. Another could be a story where Hinata discovers a new way to help Naruto control the Kyuubi. Maybe she has a special ability that she didn't know about before that can soothe the Kyuubi's chakra within Naruto. There are also fanfictions where Naruto and Hinata go on adventures together with the Kyuubi's power being a key factor in their success.
One popular storyline could be Hinata as Naruto's secretary in a political setting within the Hidden Leaf Village. She might use her gentle yet determined nature to help Naruto handle diplomatic affairs. For example, she could be the one to organize meetings with other villages' representatives, and in the process, their relationship could deepen from a professional one to something more romantic.
One popular storyline could be an alternate universe where Naruto becomes an emperor and Hinata is his queen. They might face challenges in ruling the land together, like dealing with political intrigue among the ninja clans. Another could be a story where Naruto has some sort of emperor - like powers bestowed upon him and Hinata is his trusted advisor, helping him make just decisions for the village and the wider world of ninjas.