If you want to replace Kagome in a fanfiction with an oc, start by rewriting the character descriptions. Instead of Kagome's physical and personality traits, describe your oc. Then, look at the plot points where Kagome is involved. If she has a love interest, for instance, you can either transfer that relationship to your oc or create a new one. Maybe Kagome was on a quest in the original fanfiction; your oc can take on that quest but with different motives or methods. You also need to consider how the other characters in the story will interact with your new oc. They may have different reactions compared to when they were interacting with Kagome.
One way to replace Kagome in a fanfiction with an Original Character (oc) is to first analyze Kagome's role in the story. What are her personality traits, relationships, and goals? Then, create an oc with similar but distinct qualities. For example, if Kagome is brave and kind-hearted, your oc could be equally brave but perhaps more reserved in showing kindness. Next, go through the fanfiction and systematically replace Kagome's actions, dialogue, and interactions with those of your oc. Make sure to adjust the reactions of other characters accordingly to fit the new dynamic. This process might take some time and careful consideration to ensure the story still flows well and remains engaging.
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