Well, the Naruto vs Pain fight in the original series is epic. Fanfiction allows fans to explore different scenarios and what - ifs. Maybe they want to see different character developments during that intense battle.
The plot should be engaging. It could add new twists to the Naruto vs Pain battle. Maybe introduce some new jutsus or strategies that make the fight even more exciting. Also, good fanfictions in this category usually have a good balance between action and the emotional aspects of the characters.
The outcome in this fanfiction could be a draw. Naruto and Hinata would put up a great fight against Pain. Naruto would be all fired up, using his Rasengan and other ninjutsu. Hinata would be there, protecting Naruto's blind spots with her gentle fist techniques. But Pain is no pushover. His ability to control gravity and rain down destruction could keep Naruto and Hinata at bay, leading to a situation where neither side can fully defeat the other.
In the original Naruto vs Pain fight, there were many unanswered questions. Fanfiction tries to answer those. For example, what if Naruto had more help? Or what if Pain had different motives? This makes it appealing to fans who want to explore these ideas.
In my opinion, Sakura would win. Sakura has shown great strength and combat skills. She was trained by Tsunade, one of the Sannin. She has superhuman strength which can cause massive damage. Ino, on the other hand, is mainly a mind - control type ninja. If Sakura can resist Ino's mind - control jutsu, which she likely can with her training, she can easily overpower Ino in a physical fight.
Beerus would probably win. He is a god of destruction in the Dragon Ball universe. His power levels are off the charts compared to Naruto. He can destroy planets with a snap of his fingers, and his combat skills are far beyond what Naruto has been shown to be capable of in the Naruto universe.
Well, Naruto himself might be really focused on Pain's motives in the fanfiction fight. Since he always tries to understand his opponents. Sasuke could be analyzing Pain's jutsu and thinking about how it compares to his own power. And Sakura might be worried about the destruction caused, just like she was in the original story when Pain attacked the village.
You can try some popular fanfiction websites like FanFiction.net or Archive of Our Own. They usually have a large collection of Naruto fanfictions, including ones about Naruto vs Pain.
One possible plot twist could be that Hinata discovers a new power within herself during the fight against Pain. Maybe she can tap into some ancient Hyuga ability that even she didn't know existed. This new power could turn the tide of the battle and surprise both Naruto and Pain.
It's really hard to say. Naruto has a lot of powerful jutsu and great combat experience. But Kuyo has vampiric powers which can be very dangerous. If Naruto can get in close and land a powerful Rasengan, he might win. However, Kuyo could use his speed and fangs to counter. It really depends on the situation and how the writer wants the story to go.