Well, he might get some really strange looks from his friends at first. They might not recognize him right away. Then they could start teasing him about it.
If it's in a combat situation, the enemy might be confused. They are used to seeing Naruto in his normal orange jumpsuit, and suddenly here he is looking like Kakashi. This could give Naruto an advantage in the fight as they underestimate him or misjudge his abilities.
He might start acting more like Tobirama. Tobirama was a very serious and methodical person. So Naruto could become more calculated in his actions. Maybe he would be more cautious in battle and rely less on his usual impulsive nature.
If it's a more spiritual fanfiction, the mask could have a connection to the spirit world. Naruto wearing the mask could open a portal to that world or allow him to communicate with the spirits of past ninjas. He could then seek advice from the great ninjas of the past through the power of the mask.
In such a fanfiction, Kakashi might break Naruto's spirit during a particularly tough training session. Maybe he pushes Naruto too far in combat drills, making Naruto question his abilities.
In the 'Kakashi Naruto in Timeout' fanfiction, it's possible that the timeout situation is a setup by some unknown enemy. They are trapped in a special place where they can't leave until they complete certain tasks. This forces Kakashi and Naruto to work together, using their unique skills. Naruto's Rasengan and Kakashi's Sharingan - related techniques could play important roles in getting out of this timeout situation.
Well, Naruto might start talking like Kakashi. You know, those slow, calm tones that Kakashi uses. It would be so strange to hear Naruto's energetic voice trying to be all mellow. He could also try to imitate Kakashi's way of walking, that smooth and almost stealthy gait. Maybe he'd even try to copy Kakashi's hand signs more precisely, thinking it would make him a better ninja.
In the fanfiction, Kakashi might train Naruto in teamwork. Even though Naruto is often a solo fighter, Kakashi could show him the importance of working with others. He could arrange mock battles where Naruto has to team up with other characters, like Sakura or Shikamaru, and learn how to coordinate their attacks and defenses.
In 'kakashi joins naruto fanfiction', Kakashi could join Naruto in his journey to find out more about his parents. Since Kakashi knew Minato, he could share some really personal and precious memories of Naruto's father with him. This would strengthen their bond and also help Naruto in his self - discovery.
In this kind of fanfiction, Naruto might learn a lot more about stealth and patience from Kakashi. Maybe Kakashi would train Naruto in some unique ways that are different from what he learned from other teachers. For example, Kakashi could share his special techniques for using chakra more efficiently with Naruto.
In the fanfiction, there could be a plot where Kakashi has to protect Naruto from a powerful enemy who is specifically targeting Naruto. Kakashi would use all of his skills and resources to keep Naruto safe. He might even call in some favors from his old comrades. Meanwhile, Naruto would be eager to fight alongside Kakashi, but Kakashi would have to hold him back until he is fully trained. This would create a lot of tension and action in the story.
Perhaps Kyle's dressing like a girl could be part of a magical or supernatural event in the fanfiction. Maybe he wakes up one day magically transformed into a girl - like appearance. This could lead to all sorts of adventures as he tries to find a way to reverse it, all while dealing with the reactions of his friends and family. And along the way, he might learn some valuable lessons about himself and those around him.