Kakashi could also be a common character. He is Iruka's colleague and they both play important roles in Naruto's life. In time travel scenarios, Kakashi might be involved in helping Iruka adjust to the time - shifted situation or they could work together on a mission that is affected by Iruka's time travel.
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.
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.
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One common theme is friendship. Many fanfictions explore the friendship between a female character and Iruka, showing how they become close and trust each other. For example, they might share secrets or support each other during tough times.