A main characteristic is the blend of two very different universes. Kirby's cutesy and colorful world clashes interestingly with Naruto's more serious and combat - oriented ninja world. Another is the exploration of how the characters' abilities interact. For example, Kirby's ability to copy powers could be used in interesting ways in Naruto's world of jutsu.
Definitely Naruto. Naruto would be curious about Kirby's abilities and would probably want to be friends right away. They could have some fun training sessions together, with Kirby showing off his inhaling skills and Naruto his new Rasengan variations. Also, Sakura might interact with Kirby. She could be initially a bit skeptical but would come around when she sees how Kirby can be helpful in medical situations by using his powers to quickly gather medicinal herbs or supplies.
Well, it could involve Naruto traveling to Kirby's world. Once there, he meets all the different Kirby characters. He might learn new forms of combat from them, like how Kirby uses his inhaling ability to defeat enemies. Naruto could then incorporate these new skills into his own fighting style when he returns to his world. It could also include Naruto trying to understand Kirby's simple but effective way of living and how it contrasts with the complex ninja society he comes from. This exploration of different cultures, so to speak, could add depth to the story.
Well, a plot could involve a villain in the Naruto world who is creating some sort of dark energy that is affecting both dimensions. Kirby, being a hero in his own world, senses this and travels to the Naruto universe to stop it. Along the way, he teams up with Naruto. Naruto is amazed at Kirby's power to transform by swallowing enemies. Together, they face off against the villain and his minions, with Kirby using his copied ninja skills and Naruto using his jutsu.
In a Naruto and Kirby crossover fanfiction, the plot might revolve around a strange portal that opens between their two worlds. Kirby, being his curious self, enters the portal and lands in the Hidden Leaf Village. Naruto is assigned to look after Kirby. At first, there are misunderstandings as Naruto doesn't understand Kirby's language. But as time passes, they start to communicate through actions. They discover that their powers can be combined in unique ways. For instance, Kirby could swallow some of Naruto's shadow clones to gain more strength, and Naruto could use Kirby's flying ability to reach new heights. Together, they embark on a journey to close the portal that is causing disruptions in both worlds and along the way, they face challenges from ninjas who fear Kirby and strange creatures from Kirby's world that have entered the Naruto universe.
One popular Kirby Naruto fanfiction is 'Kirby in the Naruto World'. It's really interesting as it combines the unique abilities of Kirby with the ninja world of Naruto. Kirby's power - absorbing ability creates some really cool and unexpected scenarios in the Naruto universe.
There's a fanfiction called 'Naruto and Kirby's Adventure'. In this story, Kirby somehow ends up in the Naruto universe and teams up with Naruto to face various challenges. It has a lot of action scenes and also some humorous moments where Kirby's eating abilities are used in creative ways within the Naruto world.
In such fanfiction, Kirby is often depicted as his cute, round self, but with a more tender side when it comes to his feelings for Jigglypuff. He might use his unique abilities to protect or impress Jigglypuff.
Naruto's Rasengan could be combined with Kirby's inhaling ability. Kirby could inhale an object and then spit it out with the force of a Rasengan. Or Naruto could use his shadow clones and have each clone team up with a Kirby ability. For example, one clone could work with Kirby's sword ability to fight enemies.