One common theme is the struggle for the oc against the yandere Naruto's possessiveness. For example, in many stories, the oc is an independent character who values freedom, but Naruto's yandere nature tries to restrict that. Another theme is the exploration of Naruto's character transformation. Normally he is seen as a bright and friendly character, but in these fanfics, his yandere side brings out a darker, more obsessive part of him. There's also often a theme of secrecy and danger, as the oc may be afraid to expose Naruto's true nature to others in the village.
One popular 'oc and yandere Naruto fanfiction' is 'The Yandere's Obsession'. In this story, the original character (oc) gets caught in the web of a yandere Naruto. It's really interesting as it shows a different side of Naruto's character, more possessive and intense. Another one could be 'Oc in the Yandere Naruto's World'. It has great character development for the oc as she tries to navigate the dangerous affections of a yandere Naruto.
One common theme is the struggle for freedom. The oc is often trapped in the yandere's obsessive love and has to fight to break free. Another theme is the exploration of extreme emotions. Yanderes are known for their intense love which can quickly turn into jealousy and rage, and the oc has to deal with these volatile emotions.
First, develop your characters well. Define the yandere's traits clearly, like their possessiveness and obsessive nature. For the oc, give them unique qualities. Then, create a plot that revolves around the yandere's fixation on the oc. Maybe start with a chance encounter that sets off the yandere's interest.
Naruto might be really confused at first. He's used to people being friendly or having normal crushes, but a yandere is a whole different level. He'd probably try to talk to her and understand why she's acting so strangely.
In a fanfiction, Naruto could be training in a secluded area and Yandere Koneko stumbles upon him. She immediately falls for his spunk and the fact that he doesn't give up easily. Yandere Koneko then tries to insert herself into Naruto's life by bringing him food and small gifts. Naruto is initially confused but then realizes she has a rather extreme way of showing affection and has to gently set boundaries.
One idea could be that Naruto somehow gets trapped in a dimension where Kaguya has become a yandere for him. She tries to keep him there all to herself, while Naruto has to figure out a way to escape and also deal with her obsessive behavior.
There's also 'The Yandere Male Kagome's Quest'. This one is different as it focuses more on the male Kagome's journey while still maintaining his yandere traits. He goes on adventures, all the while being possessive and overprotective of the people he cares about. It's a unique take on the yandere concept in a fanfiction setting.
To write an 'oc x yandere chan fanfiction', think about the setting. It could be a high - school setting which is quite common in Yandere - chan stories. Your OC could be a new transfer student. Focus on the emotions of both characters. The OC might be initially scared or intrigued by Yandere - chan's behavior. Yandere - chan, on the other hand, will have that intense, all - consuming love. Use descriptive language to show their actions and reactions. For instance, when Yandere - chan sees the OC talking to someone else, describe her facial expressions, her clenched fists, and the dark thoughts running through her head.
Naruto might also feel a sense of responsibility. He might think that he did something to cause Yugito to act this way. So he could start to limit his own actions to avoid triggering her yandere behavior. For instance, he might stop being so friendly with other girls in front of her. But at the same time, he would not give up his own dreams and values, and would try to make Yugito understand that her behavior is not acceptable in a way that is both firm and kind.