It could be an original character created just for the fanfiction. Maybe a mysterious ninja woman who crossed paths with Kakashi during a mission and they had a brief but intense relationship.
Yes, there are many. Some might focus on her adventures in the Naruto world, perhaps teaming up with Kakashi on a mission. Others could explore her relationship with other characters like Naruto or Sasuke.
In these fanfictions, a common theme is redemption. If Sasuke has made some wrong choices, the story might focus on how Kakashi and Naruto help him find his way back. Also, teamwork is a big theme. How the three of them work together in different missions or challenges, and how their individual strengths and weaknesses play into that. It can also be about family - like relationships, as Kakashi can be seen as a father figure to some extent, and Sasuke and Naruto as brothers.
In 'Kakashi x Sasuke x Naruto Fanfiction', the relationships are often complex. Kakashi is a mentor figure to both Sasuke and Naruto. Sasuke and Naruto have a deep and evolving bond. Fanfictions might explore how Kakashi's guidance impacts their relationship, and how Sasuke and Naruto's friendship grows or is tested in different scenarios. It could also show how Kakashi's own past experiences influence his interactions with the two boys.
One characteristic is the exploration of different power dynamics. Since Kakashi is a highly experienced ninja and Hinata has her own unique abilities, their relationship in fanfictions often plays with how they complement each other in combat or training. Another is the contrast in personalities. Kakashi is laid - back and a bit of a mystery, while Hinata is shy and reserved, which makes for an interesting dynamic in the stories.
Maybe an OC from a different village who is sent on a mission with Kakashi. Their different backgrounds and skills create an interesting dynamic during the mission. For example, the OC could be a master of water jutsu and Kakashi has to adapt his combat style to work with them.
Then there's Hana, an OC who is a sensor - type ninja. In fanfiction, she helps Kakashi in tracking down enemies and they form a unique bond as they rely on each other's skills during missions.
There are quite a few 'kakashi x hinata' fanfictions out there. One popular one might be 'The Unlikely Bond'. It focuses on how their different personalities come together in an interesting way. Another could be 'A New Path' which explores how they interact in a post - war Naruto world.
The OC's character can be developed through her reactions to different situations. When she first meets Sasuke, how does she respond to his coldness? Does she try to break through his barriers or is she put off? With Gaara, when she learns about his past, does she pity him or see his strength? Also, give her a moral code. If she believes in always helping the weak, it will affect how she treats Sasuke when he's in a dark place and how she interacts with Gaara's people in the Sand Village. Her hobbies and interests can also be used to make her more three - dimensional. For example, if she loves cooking, she could cook for Sasuke and Gaara, and through that, their relationships can grow and develop.