Well, in such a fanfiction, Naruto being a Kryptonian would mean he has heat vision. This new power could be used in battles against the Akatsuki. Instead of using Rasengan, he could simply use his heat vision to take out opponents. Also, his invulnerability would make him a force to be reckoned with. He could walk through most attacks without a scratch. His character might also change as he has to deal with these new powers and the responsibility that comes with them. It's an interesting concept that would mix the Naruto world with the Kryptonian lore.
Naruto would gain super strength. He could lift extremely heavy objects with ease, like mountains or large buildings in the Naruto world. He would also have super speed, enabling him to move faster than any ninja technique. And of course, he would be able to fly, which is a completely new ability in the Naruto universe.
A smart Kryptonian in a Naruto fanfiction might start by being an outcast. Just like Superman was an alien on Earth, this Kryptonian would be different in the Naruto world. They could use their super - intelligence to analyze and understand the ninja clans. For example, they might figure out a way to combine Kryptonian strength with Sharingan abilities if they come across the Uchiha clan.
Naruto could use his chakra control to enhance his Kryptonian super speed. For instance, he could focus chakra on his legs while using his Kryptonian speed to move even faster and more stealthily. Also, his shadow clone jutsu could be combined with his Kryptonian powers. He could send clones with super strength or heat vision to attack enemies from different directions.
Well, it could be really interesting. Naruto, with his ninja skills, suddenly having Kryptonian powers like super strength and flight would change the Naruto universe completely. He might be able to defeat his enemies even more easily or use his new powers in unique ways in battles against the Akatsuki. For example, instead of just using Rasengan, he could punch with Kryptonian strength while using chakra to enhance the impact further.
In a 'Naruto is Kryptonian' fanfiction, there are numerous possibilities. Naruto could have all the typical Kryptonian powers such as super strength, invulnerability, and super speed. This would completely change the power dynamics in the Naruto universe. For example, in battles, he wouldn't need to rely on shadow clones as much. His heat vision could be a substitute for some long - range attacks. Also, his origin story would be different. Instead of being an orphan because of the Nine - Tails attack, he could be an orphan because of Krypton's destruction. His relationships with other characters would also shift. His friends might be in awe of his new powers, and some might be jealous or even afraid. And the villains in the Naruto world would have to face a much more powerful opponent. There could be a whole new set of storylines revolving around Naruto's discovery of his Kryptonian heritage and how he uses it to shape the ninja world.
A common theme is power enhancement. Since Kryptonians have superpowers, when combined with Naruto's abilities, it creates a new level of power. Another theme could be cultural clash, as the Kryptonian and Naruto cultures are very different.
One popular kryptonian naruto fanfiction might be where Naruto somehow gets Kryptonian powers. For example, in some stories, he could be exposed to Kryptonian technology or meet a Kryptonian who imparts some of their abilities to him. This could lead to really interesting scenarios like Naruto being able to fly, having super strength, and still using his ninja skills in combination.
A smart Kryptonian in a Naruto fanfiction might start a school of their own. They could teach both Kryptonian knowledge and ninja skills. This would attract students from all over the Naruto world who are eager to learn something new. They could also use their intelligence to research and discover new forms of chakra or hidden ninja powers.
The settings can be combined too. You could create a new world where the Naruto universe and the remnants of Krypton co - exist. Maybe there's a city in this new world where ninjas and Kryptonians live side by side. Naruto could then explore this new place, learn about Kryptonian technology, and use it to enhance his own ninja tools or techniques.