The story might be about the OC having a special power. Kakashi is initially intrigued by this power and then falls for the person behind it. Once married, they work together to use the OC's power for the good of the village. They might also have some domestic scenes, like cooking together and having small arguments over silly things that show their normal married life.
One possible plot could be that they have a secret wedding. Since both are quite private people in their own ways. They don't want a big fuss, so they hold a very small ceremony in a secluded part of the forest near the village. Only a few very close friends are invited, like Naruto and Shikamaru. After that, they have to deal with the reactions of the rest of the village when they find out, which could be a mix of surprise and happiness.
Well, it could be that an enemy uses some sort of mind - control jutsu to force them into marriage as part of a cruel plan. In the fanfiction, Sakura might use her medical ninjutsu skills to try and find a way to break the forced bond while Kakashi uses his Sharingan - like skills to analyze the situation. Their friends in the village would be in shock, and some might try to help them while others might be suspicious of this sudden union. As they are forced to live together, they discover new sides of each other that they hadn't noticed before.
One possible plot could be that they got married in a spur - of - the - moment decision during a dangerous mission. They keep it a secret because they fear the reactions of their friends and the village. As the story progresses, they struggle to balance their secret relationship with their duties in the village.
In a 'natsu married oc fanfiction', perhaps the OC is a healer. Natsu gets seriously injured during a battle and the OC nurses him back to health. Natsu is so grateful and impressed by her kindness and skill that he starts to develop feelings for her. They get married and the story could focus on how Natsu has to adjust to having a partner who is more calm and collected compared to his fiery self. He might learn to be more patient and she might learn to be more adventurous from him.
One possible plot could be that after years of fighting side by side and growing closer, Kakashi finally realizes his deep feelings for Sakura. They start dating secretly at first, not wanting to disrupt the village's harmony. Then, as their relationship blossoms, they decide to get married. Their wedding could be a grand event in the village, with all their friends and comrades coming to celebrate. It could also show how they face challenges together as a married couple, like dealing with new threats to the village while also maintaining their relationship.
One possible plot twist could be that Sakura discovers Kakashi has a secret past she never knew about. Maybe he was involved in some kind of dangerous mission long ago that has consequences in the present. This could put a strain on their relationship as she tries to come to terms with this new information.
One possible plot twist could be that they face opposition from the Hidden Leaf Village. Since same - sex relationships might not be as openly accepted in the traditional ninja world. Another twist could be that they have to go on a dangerous mission together right after getting married, which tests their new relationship. And perhaps there's a secret enemy who wants to break them apart because their union represents a new kind of hope in the village.
One possible plot twist could be that Hanare is actually a spy from an enemy village but has truly fallen in love with Kakashi. She has to choose between her loyalty to her village and her love for him. Another could be that just before the wedding, Kakashi discovers a long - lost family secret that makes him question whether he should get married. For example, he might find out that his family has some sort of curse that could affect Hanare.
One possible plot twist could be that Anko is initially hesitant about the marriage due to her past traumas. Maybe she has some secrets she's afraid to share with Kakashi. For example, her past association with Orochimaru might make her doubt her own worthiness in a relationship. Another plot twist could be external threats to their marriage. The shinobi world is full of danger, and perhaps an enemy targets Anko to get to Kakashi, or vice versa. This could put a strain on their relationship as they try to protect each other while also dealing with the normal stresses of a new marriage.
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.