Well, a plot could revolve around the father of the baby. He might be in a difficult situation, like being trapped in some sort of supernatural bargain that endangers the pregnancy. Or perhaps the pregnant character forms an unexpected alliance with a former foe because they both have an interest in the well - being of the unborn child. It could add a lot of drama and new dynamics to the fanfiction.
During the pregnancy in the TVD After 8x16 fanfiction, relationships are bound to shift. The mother - to - be's relationship with her doctor, if there is a supernatural - themed doctor in the story, could be one of trust and dependence. Her relationship with other pregnant women in the supernatural community, if there are any, could be a source of support and shared experiences. Also, the relationship between the unborn child's potential godparents and the mother could be redefined as they take on more responsibilities and make promises for the future of the child.
One great 'TVD Caroline pregnant' fanfiction is 'Caroline's New Chapter'. It beautifully explores Caroline's journey through pregnancy while dealing with the supernatural world around her. The author does a wonderful job of portraying her strength and the support she gets from her friends.
One common theme is the struggle with identity. The OC, being pregnant, may question who she is now and how it changes her role in the TVD world. For example, is she still a fighter against the vampires or does the pregnancy make her more vulnerable and change her priorities.
There are many interesting fanfictions on this topic. Some might focus on how they deal with the pregnancy in the dangerous world of vampires and werewolves. For example, they could be facing threats from other supernatural beings who see their unborn child as a threat or a powerful asset.
The theme of sacrifice is often present. She may have to sacrifice her own desires or safety for the sake of her unborn child. In some fanfictions, she might even have to make difficult choices between her love life and the well - being of her baby, all while dealing with the vampires, werewolves, and witches that populate Mystic Falls.
Another theme is protection. Given the dangerous nature of their world, protecting the unborn child from various threats is often a central plot point. Enemies might try to harm the baby because of its potential power or to get revenge on Caroline and Klaus.
Obviously, Katherine would be one of the main characters as the story is centered around her time in hell and what happens after. Damon and Stefan would also be important as they have a long history with Katherine. Their reactions to her return would be crucial to the plot.
One possible plot could be Katherine coming back from hell with new powers. Maybe she seeks revenge on those who wronged her before. She could target Elena specifically, creating a lot of chaos in Mystic Falls.
One great place to find TVD OC pregnant fanfiction is Archive of Our Own (AO3). Just search for 'TVD OC pregnant' on their site and you'll get a bunch of stories. Some popular ones often involve original characters in unique relationships within the Vampire Diaries universe while dealing with pregnancy in creative ways.