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, in such a fanfiction, game Kirby could introduce anime Kirby to the more traditional power - ups from the games. Meanwhile, anime Kirby could show game Kirby some of the unique storylines and character interactions that are common in the anime. Maybe they would have a friendly competition to see who can inhale and defeat enemies faster. It would be a really interesting crossover with a lot of potential for fun and adventure.
Sure, She-Hulk is related to Hulk. Jennifer Walters, aka She-Hulk, got her powers because of a blood transfusion from her cousin Bruce Banner, who is Hulk. This connection is a key part of their storylines in the comics.
Captain America would be a great addition. His leadership and moral compass could guide Hulk and She - Hulk when they face difficult decisions. And his combat skills could come in handy during battles.
In a 'game kirby meets anime kirby fanfiction', a plot twist could be that there is a prophecy that when the two Kirbys meet, one of them will lose their powers forever. This creates a lot of tension between them as they are not sure which one it will be. Also, it could be that an ancient artifact in the fanfiction is the key to their co - existence, but it has been broken into pieces. The two Kirbys then have to search for the pieces and put it back together while being chased by enemies who want to use the artifact for their own gain.
Comics usually depict Hulk as stronger than She-Hulk. Hulk's strength levels are often at a much higher magnitude, but it doesn't mean She-Hulk is weak by any means. She has her moments and skills that contribute to her being a significant character in the comic universe.