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.
One of the most impactful moments is when Naruto taps into the Nine - Tails' chakra. It gives him a huge power boost and shows his determination to protect the village. Also, the moment when Pain realizes Naruto's unwavering will and starts to question his own actions. This is a turning point in their battle and in Pain's ideology.
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.
In the fanfiction, it might have Naruto using different jutsu or having different power levels compared to the canon battle. For example, he could have some new techniques that were not in the original story. Maybe his connection with the Nine - Tails is portrayed differently.
Typically, the 'god of shinobi' in Naruto fanfiction would have extremely powerful chakra. This could be chakra on a scale that far surpasses even the most powerful shinobi in the original Naruto series, like Hashirama Senju or Madara Uchiha.
Well, in this kind of fanfic, usually there would be intense battles. Naruto is extremely powerful with his various jutsu like Rasengan. The Shinobi Alliance also has a lot of strong ninjas. Maybe the story would focus on Naruto having to face the combined forces of the alliance due to some misunderstanding. It could also explore Naruto's growth and how he tries to resolve the conflict without causing too much harm.
The biggest difference is the creativity of the fanfiction writers. In the anime, the fight follows a set storyline. But in fanfiction, anything can happen. For example, Naruto could suddenly gain a new power that was never in the anime. It's like a whole new world of possibilities.
In this fanfiction, Naruto might be extremely enraged seeing Hinata in danger against Pain. Hinata, on the other hand, would likely show her newfound strength and determination. Maybe she'd manage to land a few surprise attacks on Pain before Naruto fully jumps into the fray.
'The Unseen Hero of the 4th War' is a great one. It focuses on a character who is often overlooked in the original story but plays a crucial role in the fanfiction. The writing style is engaging and it really dives deep into the character's emotions during the chaos of the war.
Konan could be really interesting. In some fanfictions, she might have a different backstory or motivation that affects the Naruto vs Pain fight. For example, she could be secretly trying to stop Pain from going too far in his destruction of the Leaf Village.
Maybe in the fanfiction, Naruto loses his chakra early on in the fight against Pain. But then he discovers a hidden power within himself that is not related to chakra, like a spiritual power from his Uzumaki heritage, which he uses to turn the tables on Pain.