In the novels, Kakashi's evolution is a gradual process. Initially, he is a very reserved and mysterious figure. His Sharingan eye and his combat skills are what people first notice about him. But as the story progresses, his relationships, especially with Naruto, Sasuke and Sakura, start to change him. He becomes more of a guiding figure, sharing his wisdom and experiences. He also overcomes his past fears and insecurities, which is shown through his actions and decisions as the story unfolds. This evolution makes him a more well - rounded and beloved character in the Naruto universe.
At first, Kakashi might try to distance himself from Team 7's possessiveness. He values his independence and doesn't want to feel smothered. However, as he realizes that their actions are coming from a place of deep love and loyalty, he starts to accept it more. He may even start to rely on them a little bit, for example, allowing them to help him with his paperwork or other small tasks that he usually does alone. This shows a new level of trust and closeness between them.
Kakashi would likely be shown as a loving and protective husband. He would still be the skilled ninja we know, but he would also have a soft side for his OC spouse. He might share his past traumas with her and let her in on his more vulnerable side.
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One reason could be that he saw Naruto's potential later on and realized he could have been much stronger if he had trained him earlier. For example, Naruto has a great deal of chakra and tenacity, and with proper training from Kakashi earlier, he might have reached new heights faster.
Kakashi may become more empathetic. By constantly watching over Naruto, he gets to understand Naruto's struggles better, which could make him more in tune with his own emotions and those of others.
His character could develop in a more assertive way. Instead of just tolerating Naruto's behavior, he might start to set stricter boundaries. This could make him a more respected figure in the Naruto universe within the fanfiction. For example, he could demand more respect from Naruto and others who have been taking his kindness for granted. This would change his image from a laid - back mentor to a more authoritative one.
Kakashi would become more nurturing. In the original, he was a teacher, but as an adoptive father, he'd have to be more affectionate. He might show his face more often to Naruto, as a sign of trust, and be more open about his emotions.
Well, Naruto might be more reserved in Kakashi's generation. He would be among older and more experienced ninjas. He would have to prove himself more quickly. He might not have as much room for his wild and carefree antics as he did in his own generation. He'd be learning from different mentors too, which could shape his jutsu usage and battle strategies in a new way.