There are many out there. A really good one might focus on the emotional reactions of Team Minato. For example, Minato might be proud of Naruto's strength and how he overcomes Pain. Kakashi could be in awe at Naruto's new techniques. Their reactions can enhance the overall viewing experience in the fanfiction.
You can try looking on popular fanfiction websites like FanFiction.net or Archive of Our Own (AO3). They usually have a wide range of Naruto - related fanfictions, and you should be able to find some with the 'Team Minato Watches Naruto vs Pain' concept.
They would be empathetic. Minato, as Naruto's father, would especially feel a deep sense of pain seeing his son struggle. He would want to reach out and comfort Naruto during his lonely times when the village shunned him because of the Nine - Tails.
The Konoha 12 would likely be in shock. They've seen Naruto grow, but this fight against Pain is on a whole new level. Some, like Shikamaru, would immediately start analyzing the battle strategies. Sakura might be worried sick about Naruto's safety, while Kiba could be cheering Naruto on loudly, impressed by his power.
Well, in fanfiction, if Team Minato watches Obito's future, they might be shocked. For example, they would witness his alliance with Madara and all the destruction he causes. It would be a moment of self - reflection for them. Minato might blame himself for not being there for Obito when he needed it most. Kakashi would also have a hard time seeing his old friend turned into an enemy.
One of the most dramatic moments could be when Naruto first takes a really hard hit from Pain. The Konoha 12 would gasp in horror, and Sakura might even try to run out to help. Another moment could be when Naruto taps into a new level of power. The expressions of shock and awe on the Konoha 12's faces would be quite something.
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.
He could feel it through a shared chakra link. Since they are related and Minato sealed the Nine - Tails in Naruto, there might be a latent connection that gets activated in the fanfiction, allowing him to sense Naruto's pain on a physical and emotional level.
Another plotline could be that they see a future where the relationships between different ninja clans are completely different. This makes them realize the importance of unity. So, they start to work on improving the relationships between clans in their present time. They might even try to break down some of the long - standing barriers and prejudices between the clans.
Obviously, Team Minato itself is the main focus. This includes Minato Namikaze, who is the leader of the team. He is a very powerful ninja with his Flying Thunder God Technique. Then there's Kakashi Hatake, a young and talented ninja who is known for his Sharingan. Obito Uchiha is also a key character, with his Uchiha blood and his dreams of becoming Hokage. And finally, Rin Nohara, who plays an important role in the team's dynamics.