There might be a fanfiction where Team 7 gets trapped in a genjutsu created by a powerful enemy. Kakashi has to use all his skills and knowledge to break the genjutsu while also dealing with the inner demons of each team member. This type of story would explore the psychological aspects of the characters.
A great Kakashi and Team 7 fanfiction could be set in an alternate universe where ninjas are more like superheroes. Kakashi becomes a mentor to a new version of Team 7 with enhanced abilities. They face off against a super - villain who is threatening the entire ninja world, and the story is filled with epic battles and heart - warming moments of team bonding.
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.
Another plot could be about the babies' growth and development in the ninja world. They start to learn about the different clans and jutsus from a very early age. For example, Naruto's baby might be super curious about the Uzumaki clan's secrets, and Sasuke's baby could show an early inclination towards the Sharingan and the Uchiha clan's history. This would be a story of their journey from being innocent babies to potential great ninjas.
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.
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.
A really cool plot might be that Kakashi time travels and discovers a hidden conspiracy in the past that was related to Team Minato. He then has to work with his past comrades, including Minato, to uncover the truth and prevent a great disaster that he knew about from his own time.
Maybe in the fanfiction, after a dangerous mission where Kakashi gets severely injured, Team 7 becomes possessive out of fear of losing him. They start interfering in his solo missions, insisting on accompanying him all the time. This causes some tension between Kakashi and the higher - ups in the village who think Team 7 is being too overbearing. However, Team 7 doesn't care and is determined to keep Kakashi safe.
A fanfiction might focus on how Kakashi's love for Team 7 is expressed through his daily interactions. He could be constantly giving them small gifts or words of encouragement. For example, he gives Naruto a special kunai that was passed down in his family. For Sakura, he might offer advice on how to improve her medical ninjutsu skills. And for Sasuke, he could share his own experiences of dealing with a thirst for power in a more positive way.
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.
One interesting Kakashi and Sakura fanfiction could be where Kakashi takes Sakura on a special training mission outside of Konoha. He teaches her some unique jutsu that she hadn't been able to learn from Tsunade. This fanfiction could explore their mentor - student relationship in a new light.
There are fanfictions where Kakashi and Naruto time - travel. They could end up in the past, during the era of the First Hokage. This would change the course of history as they know it and they'd have to figure out how to get back while also dealing with the different political and ninja situations of that time.
There might be a fanfiction where the reader is from another dimension and accidentally ends up in Kakashi's world. Kakashi has to protect the reader from various threats while also trying to figure out how to send the reader back home. This could involve a lot of mystery and action.