One possible storyline could be Naruto time - traveling back to Kakashi's youth. He could then help Kakashi deal with his traumas earlier, like the loss of his father. This would change the course of Kakashi's life and in turn, have a major impact on the Naruto world as we know it.
A key element in writing this kind of fanfiction is to add some mystery. Maybe there's a prophecy that involves Naruto and young Kakashi working together. You should also develop their relationship gradually. Start with Naruto being curious about Kakashi's past and young Kakashi being a bit wary of Naruto. As they face challenges together, their bond grows. Don't forget to add some cool ninja battles and unique jutsu to keep the action exciting.
Adventure is a big theme too. They go on quests together that are not part of the original story. These adventures can range from exploring new lands to uncovering hidden secrets. It's all about how their combined skills and personalities lead them through these exciting and often dangerous escapades. Their relationship also serves as a catalyst for change in the Naruto universe around them, which is another overarching theme in these fanfics.
In 'possessive Kakashi x Naruto fanfiction', one aspect could be Kakashi's possessiveness stemming from his past losses. He may not want to lose Naruto like he lost others. So, he might keep a close eye on Naruto's training, his interactions with others. It can also add an interesting layer to their relationship, as Naruto might initially be confused by Kakashi's intense behavior but gradually come to understand the underlying reasons. This can lead to character growth for both of them.
Iruka could be included. He was Naruto's first teacher and has his own connection to Kakashi. His presence can bring out the different teaching styles between him and Kakashi. Another good character is Jiraiya. His relationship with Naruto as his godfather and his connection to Kakashi through being comrades can add some interesting storylines.
I recommend "I am the Second Young Master of the Flagwood Family" to you. The main character of this novel, Flagwood Miren, transmigrated to the Naruto World and became the second young master of the Flagwood Family. He is the same age as Kakashi. The plot of this novel also included other Naruto characters, such as Haki Shuogu, Ban, and Bo Fengshui Gate. I hope you like this fairy's recommendation. Muah ~😗
In these fanfictions, a common theme is redemption. If Sasuke has made some wrong choices, the story might focus on how Kakashi and Naruto help him find his way back. Also, teamwork is a big theme. How the three of them work together in different missions or challenges, and how their individual strengths and weaknesses play into that. It can also be about family - like relationships, as Kakashi can be seen as a father figure to some extent, and Sasuke and Naruto as brothers.
In 'Kakashi x Sasuke x Naruto Fanfiction', the relationships are often complex. Kakashi is a mentor figure to both Sasuke and Naruto. Sasuke and Naruto have a deep and evolving bond. Fanfictions might explore how Kakashi's guidance impacts their relationship, and how Sasuke and Naruto's friendship grows or is tested in different scenarios. It could also show how Kakashi's own past experiences influence his interactions with the two boys.
There's also 'Kid Kakashi's New Friend Naruto'. This fanfiction delves into how Naruto, being the outcast he is in the village at first, finds an unexpected friend in Kid Kakashi. The author does an excellent job of depicting the insecurities of both characters and how they overcome them through their friendship.
One great 'Kakashi Hatake x Naruto' fanfiction is 'The Mentor and the Jinchuriki'. It focuses on Kakashi helping Naruto develop new skills while also showing a deep emotional bond between them. It has a lot of well - written action scenes and heart - to - heart conversations.