It could be an original character. For example, a young orphan ninja who has always felt like an outcast in the village. Discovering the Shadow Monarch powers gives them a new sense of purpose and a chance to prove themselves.
One idea could be a crossover where the Shadow Monarch's powers are introduced into the Naruto world during a major conflict, like the Fourth Great Ninja War. The main character, perhaps a young ninja, discovers the power of the Shadow Monarch and has to learn to control it while also dealing with the existing political and power struggles in the ninja villages.
😋I recommend "I'm Pregnant with the Prince Regent's Baby". This is an ancient romance novel. In order to survive, the female protagonist, Ian, decided to hug the male protagonist's thigh. In the end, after rebirth, he found out that the male protagonist was a female supporting character. The male protagonist's true love, the female protagonist, had also been reborn. However, the female protagonist still decided to cling to the male protagonist's thigh and live until the last episode. In the end, the entire court was shocked to find that the emperor was pregnant, so the female protagonist ran away with the male protagonist's child, causing the Regent to be angry and chase after her. This was a poem about a woman. The female protagonist was the emperor, and the male protagonist was the only one who was favored. I hope you like this fairy's recommendation. Muah ~😗
A really cool plot could be where the Shadow Shadow Fruit user teams up with Kakashi. Kakashi is known for his intelligence and combat skills. Together, they could come up with unique strategies using the Shadow Shadow Fruit. For instance, they could use the fruit's power to create illusions within the shadows, confusing their enemies. The fanfiction could then explore how they face different threats in the Naruto world while developing their bond.
One challenge could be the chakra consumption. Shadow travel might require a large amount of chakra, and Naruto has to learn how to manage it. If he uses it too often or for long distances, he could run out of chakra in the middle of a mission or a fight.
It could also change his stealth abilities. Since it's a shadow weapon, it may allow Naruto to blend into shadows more easily, making it easier for him to spy on enemies or launch surprise attacks. This would be a great advantage in his ninja missions.
The shadow weapon might be an ancient relic from Wave. Maybe it was created by a powerful shinobi from Wave long ago and has been lost until Naruto found it.
The Shadow Shadow Fruit would likely disrupt the existing power dynamics. For one, it could give a character an edge in combat. Since it can control shadows, it could be used to immobilize opponents. So, a previously not - so - strong character could suddenly become a threat.
In Naruto fanfiction about shadow powers, one can expect to see unique interpretations of the Nara clan's abilities. Writers might expand on how these shadow powers can be used in combat beyond what's shown in the original series. For example, they could create new jutsu that combine shadow manipulation with other elements.
One possible story could be about Naruto training with his female shadow clone. They could have unique interactions where the clone helps Naruto understand his own emotions better. Since the clone has the same memories as Naruto but with a different perspective, it could offer new insights to him during his training sessions.