In this kind of fanfiction, Kakashi would probably make sure Naruto is comfortable first. He might tuck Naruto into bed, just like how a caring mentor would do. Then, he'd likely prepare some warm soup for Naruto to help him get better.
If Kyuubi takes over Naruto in fanfiction, Naruto might become a much more powerful and uncontrollable force. His appearance could change, perhaps taking on more fox - like features. He would likely lose his sense of self and act on the Kyuubi's primal instincts, which could lead to chaos in the Hidden Leaf Village as he would no longer be the friendly and determined ninja they knew.
In the fanfiction, Naruto would be super protective. He'd use his ninja skills to keep the baby safe from any harm. For example, if there was a threat, he could quickly create a barrier around the baby using his chakra. Also, he'd be really patient, which is a bit different from his usual impulsive self when it comes to taking care of the baby.
One possible plot could be that Harry, using his magic skills, protects Naruto from the various threats in the Naruto universe. For example, he could use spells to shield Naruto from enemy ninjas' attacks. He might also use his knowledge of magic to help Naruto understand some concepts that are difficult in the ninja world, like a different way of looking at chakra manipulation which could be related to how magic works in Harry's world.
Iruka and Naruto are the central characters. However, depending on the plot of the fanfiction, characters like the Third Hokage could be involved. He might be the one who gives Iruka certain instructions or permissions regarding Naruto. And then there are Naruto's friends from the academy, such as Kiba and Shino. They could be part of the story, for instance, joining Naruto in some training sessions arranged by Iruka.
In the context of Naruto fanfiction, 'oc takes care of naruto fanfiction' could also suggest that the oc is used to fill a gap or add a new dimension to the story. The creator uses the oc to take care of certain narrative needs. For instance, if the fanfiction wants to explore a new storyline that the original Naruto story didn't touch on, the oc can be designed to start that journey. The oc might take care of introducing new concepts, like a new type of jutsu or a different way of ninja training, which enriches the Naruto fanfiction.
In this kind of fanfiction, Hinata's care often deepens their bond. Naruto, who has always been somewhat alone, starts to rely on Hinata more. This reliance can turn into a deeper form of love. As Hinata takes care of his physical and emotional needs, Naruto realizes how important she is to him, which can lead to a more romantic relationship between them.
If the Kyuubi takes over Naruto in fanfiction, it could change the whole plot. Naruto might lose his sense of self. His body would be dominated by the Kyuubi's raw power. Enemies could see this as an opportunity to take advantage of the situation. However, some fanfictions might show Naruto gradually regaining control with the help of his inner will or the support of his friends.
The story could develop with Naruto becoming a villain of sorts. He might start attacking other villages or even his own, leading to a big conflict. His friends would then be on a mission to save him.
Kurama's care can have a profound influence on Naruto's growth. For one, Kurama's power, which Naruto can access, gives him a physical boost in battles. This newfound strength helps Naruto face tougher opponents and survive dangerous situations. Emotionally, Kurama's presence provides a sense of companionship. Naruto no longer feels completely alone, and this gives him more confidence. Kurama's advice, based on his long existence and knowledge, also guides Naruto in making better decisions. For example, when dealing with complex political situations in the ninja world, Kurama might offer insights that Naruto wouldn't have considered on his own.