The main characters are not just limited to the ones we know from the original series. There could be some side characters from the village who play important roles. For example, a medical ninja who helps take care of the babies when they are ill or injured. Also, there might be a mysterious figure from another village who has a connection to the events surrounding Team 7's babies.
One interesting plot could be the team facing a new and extremely powerful enemy that forces them to develop new jutsus and strategies. For example, a villain who can manipulate time, making their regular combat skills ineffective.
Kakashi is often a favorite. His cool and mysterious demeanor, along with his powerful jutsu, make him a central and exciting character in fanfiction. He has a lot of room for backstory exploration.
One interesting story could be about Kakashi taking Team 7 on a special mission that involves time travel. They end up in the past and have to interact with their own predecessors. It's full of action and character development as they see how things used to be.
It could be Orochimaru. He might see the baby versions of Team 7 as perfect subjects for his experiments. He could try to kidnap them to use their unique chakra or potential for his own dark purposes.
One possibility is that there would be a lot of reminiscing. Team Minato was Kakashi's old team. They might talk about old missions, like the one where they faced the Stone ninjas. Kakashi could share how their teachings influenced his leadership as Hokage.
Emotionally, it would be a powerful encounter. They might share their feelings about the losses they've all faced, like the death of Minato. This could strengthen their relationships and also give Kakashi new insights as Hokage on how to protect the village better.
Maybe in the fanfiction, an enemy uses a jutsu to turn Team 7 into babies. Kakashi then has to figure out how to reverse the jutsu while dealing with the cute but sometimes troublesome baby versions of his students. For example, Naruto might be constantly hungry and crying for ramen, Sasuke could be moody and brooding even as a baby, and Sakura might be overly energetic and trying to 'help' Kakashi in her own clumsy way.
Kakashi would be really interesting. He has a lot of past experiences and knowledge. In a time - travel scenario, he could use his wisdom to guide Team 7 through different historical events. He might also have some personal moments, like seeing his old friends or mentors in the past. His sharingan could also play an important role in understanding the new situations they find themselves in during the time travel.
Maybe they time travel to a point where a major battle was lost in the past. Kakashi and Team 7 could change the outcome of that battle. For example, if they go back to the battle against the Nine - Tailed Fox when it first attacked Konoha. They might be able to prevent some of the destruction and save more lives. Or they could travel to a time when a powerful ninja was wrongly exiled, and they work to clear that ninja's name and change the course of history.