Perhaps explore the backstory of a Hunter Nin. Maybe they were once a normal ninja but something happened, like a betrayal in their village, which led them to become a Hunter Nin. This could add depth to the character and the fanfic.
One idea could be to focus on a Hunter Nin's mission to track down a rogue ninja who has a unique and dangerous jutsu. The Hunter Nin could face various challenges during the pursuit, like dealing with traps set by the rogue ninja.
One idea could be that Naruto is forced to become a hunter nin after a rogue ninja from another village steals a powerful Konoha jutsu. He has to track the ninja down, using his unique skills like the Shadow Clone Jutsu for surveillance. Along the way, he discovers new chakra abilities that are specific to the hunter nin role.
One interesting 'Naruto is a hunter nin' fanfic could be where Naruto uses his hunter nin skills to track down powerful and elusive enemies in the Naruto world. He might combine his Uzumaki tenacity with the stealth and tracking abilities of a hunter nin.
One idea could be exploring the backstory of an S - class missing - nin. Maybe they had a noble reason to turn their back on the village at first, like trying to protect a loved one from a corrupt system within the village.
One great 'Hunter Nin Naruto' fanfic is 'The Hidden Hunter'. It has an interesting plot where the main character, a hunter nin, discovers a hidden power within Naruto. The story is filled with action and unique interpretations of the Naruto world.
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.
It allows fans to explore different 'what - if' scenarios. What if a hunter nin was involved in key Naruto events? This kind of speculation is very appealing to Naruto fans, as it gives them a chance to see their favorite characters and world in new and exciting situations.
Maybe Naruto goes missing - nin by choice to protect the village from a secret and powerful threat that he can't fight as an official shinobi. He could be secretly training in isolation and gathering allies from the fringes of the ninja world.
In a 'naruto is a missing nin fanfiction', Naruto could be forced to become a missing nin due to a threat against his friends. He leaves to draw the danger away from them. While on his own, he trains intensively and becomes a more powerful and stealthy ninja. He also has to deal with the emotional turmoil of being separated from his loved ones and the village he once called home.
One interesting 'rogue nin Naruto fanfic' could be about a rogue ninja who has a unique bloodline ability that was shunned in their village. They then go on a journey to find others like them. Another could focus on a rogue nin's redemption arc, where they try to make up for their past misdeeds in the Naruto world. There are also fanfics that might explore the relationships a rogue nin forms with other outcasts in the Naruto universe.
One interesting concept could be the exploration of the rogue nin's backstories. For example, how they became rogues in the first place, whether it was due to a misunderstanding with their village or a personal ideology clash. Another concept might be the unique jutsus or abilities they develop while on their own, away from the traditional ninja training of their villages.