Often, Gai is paired with Kakashi in Hurt Kakashi fanfiction. Gai, with his unwavering belief in friendship and his eternal rivalry with Kakashi, can be a great character to interact with a hurt Kakashi. He might try to pull Kakashi out of his slump through their friendly competition. Also, Rin is sometimes included. Since she has a significant past with Kakashi, her presence in the fanfiction can either be a source of comfort or more pain, depending on how the story is written.
Well, often in Hurt Kakashi fanfiction, there's the theme of his physical injuries and how he copes with them. Given his dangerous line of work as a ninja, he gets hurt a lot. Writers might explore how he deals with long - term or serious injuries that could potentially end his ninja career. Also, his relationships can be a source of pain. For instance, his complex relationship with Obito and how that affects his mental state when they are at odds.
Naruto can also be paired with Dark Kakashi. Naruto's unwavering belief in the good of people could contrast sharply with Kakashi's darker self. It might lead to situations where Naruto tries to bring back the old, more positive Kakashi, and through their interactions, both characters grow and learn more about themselves.
Often, Naruto is paired with Kakashi in such fanfictions. Their bond from the original series can be explored in new ways in the context of Kakashi's reincarnation. For example, Naruto might be the one to discover Kakashi's reincarnated form and help him adjust.
Kakashi would likely be very concerned. He would immediately assess Naruto's injuries. If they were serious, he would use his medical skills to start treating him right away. His first reaction would be to make sure Naruto was stable and out of immediate danger.
It could be for Sasuke's own good. Kakashi might think that by hurting Sasuke physically in a controlled way, like in a very tough training, he can make Sasuke stronger and more resilient. He could be trying to prepare Sasuke for the harsh realities of the ninja world.
In a fanfiction, Kakashi and Minato could be on a mission together in a dangerous, unknown territory. There could be traps everywhere. Minato, being the faster one, might rush ahead to scout but accidentally trigger a trap that causes some damage to him. Then, when Kakashi tries to help, he might also get injured by the after - effects of the trap or other hidden threats in the area.
One possible fanfiction could be about Kakashi getting injured during a mission. Maybe he's protecting his team and takes a powerful jutsu head - on. His students then have to figure out how to get him to safety and find a way to heal him. It could show their growth as they face this difficult situation.
He'd probably be a mix of angry and sad. Angry at whoever or whatever caused Naruto to be in this state, and sad because he cares about Naruto so much. He might clench his fists tightly, trying to control his emotions while he focuses on helping Naruto. He'd also feel a sense of guilt, wondering if he could have prevented this from happening.
Naruto could be often involved. Since he's Kakashi's student, he might be part of the events that keep repeating in the time loop. Kakashi could be trying to protect Naruto in different ways each time the loop occurs.
Sasuke could be a popular character. He might be involved in the story in a way that either helps or hinders the situation where Naruto hurts Kakashi. For example, if Sasuke tries to stop Naruto from doing something stupid that would hurt Kakashi.