Well, a great storyline might be Naruto and Sarutobi Sensei going on a secret mission together. Maybe they have to retrieve a powerful and dangerous artifact before it falls into the wrong hands. Or perhaps a story where Sarutobi Sensei reveals to Naruto some hidden secrets about his family that have been long forgotten. Also, a story where Sarutobi Sensei uses his experience to help Naruto deal with some political unrest within the Hidden Leaf Village would be quite engaging.
A possible storyline is that Sarutobi Sensei, seeing Naruto's potential, decides to train him in a special form of chakra control that only he knows. This could lead to Naruto developing a new and powerful technique. Another idea is a story set during a time when the village is under attack and Sarutobi Sensei entrusts Naruto with a crucial task that could save the village. There could also be a fanfiction where Sarutobi Sensei and Naruto have to solve a mystery that has been plaguing the village for ages.
One interesting storyline could be Naruto learning some ancient and forgotten jutsus from Sarutobi Sensei. This could involve Sarutobi Sensei passing on his vast knowledge of unique techniques that were lost over time. Another could be a time - travel story where Naruto goes back in time and meets a young Sarutobi Sensei, and they team up to face a common enemy. It could also be a story where Sarutobi Sensei trains Naruto in the art of leadership, much like he did for the previous generations in Konoha.
A great storyline could be about Gai Sensei sharing his life stories with Naruto. How he overcame his own weaknesses and challenges in his youth. This would not only be inspiring for Naruto but also give readers a deeper understanding of Gai Sensei. Naruto could then use these stories as motivation in his own journey to become stronger and protect the village.
One way is through joint training sessions. Sarutobi Sensei could push Naruto to his limits and in the process, they would learn more about each other's strengths and weaknesses. Also, they could be put in a situation where they have to rely on each other completely, like being trapped in a dangerous genjutsu. Sarutobi Sensei could then use his wisdom to guide Naruto out, strengthening their relationship. Another aspect could be Sarutobi Sensei introducing Naruto to important figures from his past, which would give Naruto more context about his sensei and bring them closer.
One possible plotline could be Sarutobi mentoring Naruto more closely. Since he's alive, he could pass on even more of his wisdom and jutsu knowledge to Naruto. For example, he might teach Naruto some of the more secretive fire - style jutsu that only he knows.
One interesting plotline could be Naruto using his unique experiences as a former student to develop new and unorthodox teaching methods. For example, he might incorporate his own journey of learning difficult jutsus into his lessons, making it more relatable for his students.
One interesting 'naruto sensei fanfiction' story could be about Naruto teaching a new generation of ninja unique jutsu. For example, he might teach them a special combination of his Rasengan and Shadow Clone techniques. Another could be Naruto as a sensei during a time of peace, and he has to deal with the daily antics of his over - enthusiastic students. There could also be a story where Naruto as a sensei discovers a hidden talent in a seemingly ordinary student and helps that student reach their full potential.
A great plot could be Itachi teaching Naruto how to control the Nine - Tails' chakra in a completely different way than Jiraiya did. Since Itachi has such a deep understanding of chakra and its nature, he could offer unique insights. Also, there could be a story where Itachi and Naruto are forced to team up against a common enemy that is using an ancient and powerful jutsu. In the process, Itachi passes on some of his Uchiha clan's wisdom to Naruto. And perhaps, Itachi could help Naruto deal with the loneliness that often comes with being a jinchuriki, as Itachi has also felt isolated in his own way.
One idea could be that Naruto, as a sensei, takes on a student who has a similar past to Zabuza. He uses his knowledge of Zabuza's story to teach the student about redemption. For example, Naruto could tell the student how Zabuza was once a feared assassin but had a side that was capable of love and loyalty, as seen with Haku.
A great plot could be that Naruto, as sensei, takes Team 7 on a diplomatic mission to another hidden village. Along the way, they face various challenges that test their teamwork and understanding of different cultures. This could lead to some interesting character development for the members of Team 7. Another idea is that Naruto discovers a prophecy related to one of the Team 7 students. He then has to train and guide this student to fulfill their potential and avoid a dark fate predicted in the prophecy. And there could be a story where a powerful enemy targets Team 7 specifically because of Naruto's influence on them, and Naruto has to find a way to protect his students while also uncovering the enemy's motives.
One idea could be Naruto teaching Anko a new jutsu. He could use his unique experiences and skills to help her expand her abilities. Another plot could involve them going on a mission together where Naruto has to rely on Anko's knowledge of certain areas or enemies. For example, Anko might be familiar with a particular type of snake - related enemy, and Naruto has to trust her expertise.
One idea could be exploring the early days of the Sarutobi clan. Maybe show how they developed their unique jutsu. Another could be a story centered around a young Sarutobi clan member who has a rare ability and must prove themselves in the Hidden Leaf Village.