One idea could be a story where Naruto discovers a new, hidden aspect of his shadow powers that allows him to communicate with the shadows of the past ninjas. He could learn ancient techniques from them and use this knowledge to defeat a powerful new enemy.
Sasuke could be involved by having his own run - in with Naruto's shadow powers. Maybe Naruto accidentally uses his powers on Sasuke during a fight, and Sasuke has to figure out a way to break free. This could lead to a new understanding between them.
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 interesting aspect is the potential for crossovers. Fanfiction might combine Naruto's shadow powers with other fictional universes, creating really cool and unexpected storylines. For instance, a crossover with a superhero universe where Naruto's shadow powers are compared or combined with a character who has similar abilities like controlling darkness.
They might combine their powers through a sort of energy transfer. Shadow could transfer some of his chaos energy into Sonic while he's in Werehog form, enhancing Sonic's already formidable abilities. This could also work the other way around, with Sonic sharing his Werehog - specific energy with Shadow to give him new skills or boost his existing ones.
One possible new power could be the power to absorb and use any chakra, regardless of its origin. This would make him extremely powerful as he could draw from the chakra of his enemies or even from natural sources like the sun or the earth. He could also gain the power of telepathy on a large scale, being able to communicate with anyone in the world or even across different dimensions. Additionally, he might obtain the power of instant teleportation to any place he desires, which would give him a huge advantage in battles and travels.
In a Naruto - Superman powers fanfic, perhaps Naruto gets some of Superman's powers accidentally. He struggles to control the new powers like heat vision and super speed along with his own ninja abilities. Superman, on the other hand, discovers he can use chakra in a limited way and they both have to figure out how to use these new combinations of powers effectively.
Well, in some fanfics, Naruto's death could be like a sacrifice that unlocks some hidden or ancient power. Maybe his death releases a special chakra that was locked within him, and this chakra then transforms into new, more powerful abilities. It could also be that his death is part of a prophecy, and upon his death, a deity or some other powerful entity grants him powers as a reward for his selfless act of sacrificing himself.
Some fanfics feature a light power that can heal. It works by using the positive energy of light to mend wounds and restore a character's chakra. This power is often associated with a sense of purity and is usually possessed by characters with a kind heart in the Naruto fanfic universe.
Naruto could use his Rasengan with Superman's strength. Imagine the power of a Rasengan thrown with Superman - level force. It would be extremely destructive.