One popular plotline could be a crossover where Naruto's world and the Kryptonian world somehow collide. Maybe Naruto meets a Kryptonian like Tamarron and they have to team up against a common enemy. Karin could get involved by using her unique abilities to sense chakra and help in battles. Another plotline could be a love triangle between Naruto, Tamarron, and Karin, with all the drama and conflict that comes with it.
Naruto's ability to use chakra and perform jutsus could be combined with Tamarron's Kryptonian powers. For example, Tamarron could use her super strength to create a distraction while Naruto uses a clone jutsu to attack from multiple angles. Karin's ability to sense chakra could be used to detect hidden enemies or power sources. So, in a battle scene, Karin could alert Naruto and Tamarron to an approaching threat, and they could then use their combined powers to defeat it.
If Karin had Kryptonian abilities, her confidence would likely soar. She could become more assertive in her actions. For instance, with super strength, she would no longer be as afraid in combat situations. Her character might also become more isolated at first as she tries to figure out her new powers on her own, not wanting to endanger her friends. But as she masters them, she would be more open to sharing and using them for the good of the group.
One interesting plot idea could be that Karin discovers she has some Kryptonian-like powers due to some strange experiment or ancient magic. For example, she might gain super strength and heat vision, which she has to learn to control while also dealing with her normal ninja life in the Naruto world. Another idea is that a Kryptonian crashes in the Naruto universe and Karin is the first to find them. She then has to help this alien understand the ways of the ninja world while also learning about Kryptonian culture from them.
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.
Naruto, having been banished, may initially lose his sense of purpose. However, with Karin by his side, he could find a new reason to strive. He might develop a more nuanced view of the ninja world and its politics. Karin, on the other hand, could develop a softer side. She has always been in a tough situation, but Naruto's kindness could make her more empathetic. She may also start to trust others more, especially Naruto, which is a big step for her character.