One common theme is self - discovery. The SI often has to figure out how to use their new Naruto powers, which is like a journey of self - exploration. Another theme is friendship, just like in the original Naruto series. They form bonds with the characters in the Naruto universe.
One popular 'SI with Naruto Powers' fanfic is 'Naruto: Reborn into the Uzumaki Clan'. It has an interesting take on a self - insert character inheriting Naruto - like powers and navigating the Naruto universe. Another is 'A New Beginning in Naruto World' which shows how the SI uses the powers in unique ways to change the course of events.
If the SI has the power of telepathy, it can greatly affect the Avengers' dynamics. They could read the minds of the Avengers, which might lead to some initial mistrust. However, if used properly, it could also enhance communication during battles. For example, they could quickly convey the enemy's plans to the rest of the team. Another example is if the SI has the power of flight and super speed. This could change the way the Avengers approach battles, as the SI could be used for quick reconnaissance or to quickly transport team members to different locations. It could also make some members a bit jealous at first, but over time, they would learn to utilize this new asset.
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.
In fanfic, Naruto might have the power to control time. This could be used to go back and change crucial events in the ninja world. For example, he could prevent the destruction of his village in the past.
Perhaps it could have a power of transformation. Not just in terms of its physical form, but also in how it affects Naruto. It could transform Naruto into a more spiritual - like being for a short time, granting him enhanced senses and the ability to interact with spiritual realms, which would be a very cool addition to his abilities in the fanfic.