Yes, there are likely non - adult fanfics out there. Many fans like to create stories that focus on the relationship between characters in a more platonic or adventure - based way. You can search on fanfic platforms and look for tags that indicate non - adult, friendship - centered stories involving Iruka sensei and an unnamed reader.
One popular theme is mentorship. Iruka sensei is a teacher, so many fanfics might explore him guiding the reader - character in their ninja training. Another could be friendship, showing how they become close friends and support each other through various challenges in the ninja village.
At first, it might start with Iruka showing simple kindness to Naruto, like making sure he has enough to eat. As time goes on, Naruto starts to see Iruka as a father figure. He looks up to Iruka and wants to make him proud.
In the fanfiction, Naruto's new sensei could be a mysterious figure who has ties to the Sage of Six Paths. This person might have been waiting for the right time to appear and train Naruto. They could possess knowledge about the origin of chakra and how to fully unlock Naruto's power. It could also be someone who was once an enemy but has now changed their ways and wants to use their skills to train Naruto for the greater good of the ninja world.
There's a chance that Naruto's new sensei could be a self - taught ninja who has developed their own unorthodox style. This person sees Naruto's ability to think outside the box and wants to refine that in him. They could introduce Naruto to a new way of looking at chakra control and combat strategies that are completely different from what he has been taught so far.
Iruka can be a great source of emotional support. He can listen to Naruto and his family's problems and offer advice based on his own experiences. For example, when Naruto is stressed about his Hokage duties, Iruka can remind him of how far he has come and that he can handle it. Also, Iruka can teach Naruto's kids things that Naruto might not have time for, like the history of the village in more detail.
I think Orochimaru would be the most unexpected sensei. Usually, he's seen as a villain, but in a fanfiction, if he were to train Naruto, it would be extremely unexpected. He has a vast knowledge of jutsu, especially forbidden ones. He could teach Naruto some very powerful and unique abilities, but at the same time, Naruto would have to deal with Orochimaru's morally ambiguous nature.
Iruka's teaching is more traditional, focusing on the fundamentals and the proper way to do things. In contrast, Naruto would be more about inspiring the students through his own story. He might say things like 'I was just like you once, and look at me now!' His style would be more about motivation and showing that there are different paths to success in the ninja world. Iruka would be the one to correct the students' form and ensure they understand the basic principles, while Naruto would encourage them to break boundaries and think outside the box.
He could have adventures in the Forest of Death. Anko has experience there, and she could take Naruto on more dangerous and secretive missions within that area. Naruto would learn how to better handle the perils of that forest.
In the fanfiction, Iruka might start to see Anko as an important part of Naruto's development. He could encourage Naruto to learn from her, which would lead to a closer bond between Naruto and Anko. Anko, who has her own rough past, could see a bit of herself in Naruto and want to protect him. This would make her more involved in Naruto's life, and she would have to interact more with Iruka. Over time, they could form a sort of team - like relationship where they all support each other. Iruka would offer stability, Anko would offer her unique skills and Naruto would bring his determination and spirit, which would strengthen their relationships.