Well, by changing Kakashi's relationships. For example, the OC might have different interactions with Obito's spirit or with Rin in memories. This can create new emotional depth.
In such fanfiction, the Kakashi OC often has unique physical features. For example, they might have distinct hair color or eye shape that sets them apart.
I've read one where the OC, reborn as Kakashi's child, had some sort of special chakra ability that was a result of their rebirth. It was really interesting to see how the author incorporated that into the Naruto universe. The story also delved into the relationship between Kakashi and his child. Kakashi was shown as a very protective but also a strict father, trying to train his child to be a great ninja. Another aspect that was well - written was the OC's interactions with Naruto and Sasuke. They became friends and had adventures together, which was really engaging.
One idea could be that the OC, now as Kakashi, has to deal with the same traumas Kakashi had but with a different perspective from their original self. For example, they might handle the loss of their comrades in a new way that changes the course of events in the Naruto world.
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.
One common theme is self - discovery. The OC, being in a new world and having a new identity as Kakashi's child, often has to figure out who they are in this new context. Another theme is family. It explores the relationship between the OC and Kakashi, how they interact, and how Kakashi influences the OC's growth. There's also the theme of adapting to a new culture. The Naruto world has its own set of rules, values, and ways of life, and the OC has to adapt to that.
One common theme is adventure. OCs often join Kakashi on various missions, exploring new places and facing different threats within the Naruto world. For example, in many stories, they might go on a mission to a far - off land to retrieve a valuable item or protect a village.
Well, 'kakashi oc' means original character related to Kakashi. Fanfiction is stories written by fans. However, without reading it, it's hard to say exactly what it's about. It could be about an adventure with Kakashi and the original character, or it could explore a different side of Kakashi's personality through the interactions with this OC.
There's also 'Reborn as Kakashi: Changing the Future'. In this fanfic, the reborn Kakashi uses his knowledge from his past life to change some of the darker events in the Naruto world. It's really interesting to see how he strategizes and forms new relationships while still maintaining his cool and aloof Kakashi persona.
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.