It might be one of the existing minor characters from the Naruto series who finally gets a chance to shine as Kakashi's apprentice. For example, that one ninja from the background who always admired Kakashi from afar and now has the opportunity to be his student.
Perhaps a storyline where the apprentice gets involved in a mission that was originally meant for Kakashi. This could lead to the apprentice having to prove themselves not only to their teammates but also to Kakashi. They might encounter powerful enemies and have to use their wits and the skills they've learned from Kakashi to survive. In the process, they could also discover some secrets about Kakashi's past that helps them better understand their master.
One great fanfic in this category might be 'The Godlike Naruto: Kakashi's Prodigy'. It shows Naruto's journey as he learns from Kakashi and becomes incredibly powerful. The story delves into how Naruto's newfound skills impact his relationships with his friends and foes alike.
Kakashi himself would also be a central figure. His role as a mentor would be crucial. He could be shown guiding the apprentice, sharing his wisdom and his own experiences as a ninja, like his time in the ANBU or his relationship with his former teammates.
Perhaps a storyline where the apprentice discovers a new jutsu and has to keep it a secret while they master it. They could struggle with whether or not to tell Kakashi, fearing disappointment if they fail. This adds an element of internal conflict.
In this fanfiction, the plot might revolve around the relationship between Naruto and Kakashi as master and apprentice. Kakashi could be guiding Naruto not just in combat skills but also in understanding the deeper meaning of being a shinobi. They might go on special missions together where Naruto has to rely on Kakashi's wisdom and training more than his own brute strength. Also, Kakashi might share some of his own past experiences with Naruto, which would help Naruto grow both as a fighter and as a person.
Well, Iruka - sensei could be a supporting character. He might check in on Naruto from time to time to see how he's doing under Kakashi. Tsunade could also play a role. Maybe she has some special tasks for Kakashi and Naruto as part of Naruto's apprenticeship. And then there are Naruto's other friends like Choji and Kiba. They could be involved in group training sessions or missions that are related to Naruto's training with Kakashi. For example, they could be the ones Naruto has to protect during a mission as a test of his skills learned from Kakashi.
Perhaps Mikoto sees Naruto's potential not just as a shinobi, but as a person who can bring about change. She could train him in areas like stealth and intelligence - gathering, skills that are crucial for a ninja. Naruto, with his determination, would quickly pick up on these skills and use them to protect the village in ways he hadn't before.
A frequent theme is the inheritance of Kakashi's knowledge. Sakura may learn his unique combat styles, his way of thinking in battle, and even some of his ninja philosophies. Also, the theme of self - discovery for Sakura is often present. As she trains with Kakashi, she discovers new aspects of herself, like her untapped potential in areas she didn't expect.
One possible fanfic could be about Kakashi's father, Sakumo Hatake, having some kind of post -mortem influence on Naruto. Maybe Naruto discovers an old jutsu that was once used by Sakumo and tries to master it. This could lead to a series of adventures where Naruto learns more about the history of the Hidden Leaf through Sakumo's legacy.