Bonnie would become more protective. Since she's pregnant, she'd be constantly worried about the safety of the unborn child. This would make her more cautious in her actions and interactions with the other characters. For example, she might be less likely to engage in dangerous magic without thinking about the potential harm to the baby.
Her pregnancy could make Bonnie more empathetic. She's going through a very human experience, even though she's a witch in a supernatural world. This could lead her to better understand the feelings of others, like the humans in Mystic Falls who are often caught in the crossfire of the vampire and witch battles. She might start to advocate for more peaceful solutions to problems to ensure a safe world for her baby.
If Dimitri is the father, their relationship could become even more intense. Dimitri would likely be extremely protective of Rose and the unborn child. He might become more possessive in a way, not wanting to let Rose out of his sight. Their relationship could also shift from a more equal footing in combat and friendship to one where he feels he needs to take on the role of the main protector.
She would become more determined. Knowing she has a child on the way, she would be more resolute in making a life for herself away from the constraints of her old life. For example, she might be more assertive in finding a job or a place to live.
Caroline's pregnancy could make her more assertive. She has to think about the future of her child, so she would be more determined to fight for what she believes is right for them. For instance, she might demand better protection for the supernatural community if she thinks it will benefit her child in the long run.
Caroline's pregnancy could also bring her closer to some characters she previously didn't have a strong bond with. For instance, an older vampire or witch who has knowledge about such pregnancies in the past could offer their guidance and support. This could lead to new friendships or mentor - mentee relationships as they all work together to ensure the well - being of Caroline and her baby.
The OC's rebirth might introduce new plotlines. They could be searching for their true identity which could lead to uncovering secrets that were previously unknown in the Vampire Diaries universe. Maybe they're a key to a new type of magic or a way to end the eternal war between the species.
If Caroline is pregnant in the fanfiction, Klaus might see this as an opportunity to claim her and the baby as his own. He has always had a soft spot for Caroline. His possessive nature could lead to him becoming overprotective, which Caroline may or may not like. It could cause a lot of tension between them as Caroline values her independence.
Nancy would likely become more protective. She's always been brave in facing the Upside Down's terrors, but now she has someone else to think about. Her maternal instincts would kick in, and she might be more cautious in dangerous situations.
Kushina's pregnancy could also lead to new relationships. Maybe she meets other pregnant women in the village and they form a sort of support group. This could be a new aspect of her social life. And with the medical ninja taking care of her, she could develop a closer relationship with them, learning more about the medical side of pregnancy and childbirth in the ninja world.
Her skin would probably be paler, like a typical vampire. Her eyes might be red or have a strange glow to them. Her hair could be a bit wilder, as if she's constantly in a state of hunger or heightened emotion. And she might have fangs that are visible when she smiles or speaks.
Harry's magical abilities would be adapted to the new environment. His knowledge of defensive magic would be crucial. He could use the Shield Charm in new ways, like protecting against vampire compulsion. His flying skills on a broomstick might not be as useful as in Hogwarts, but he could learn to use magic to levitate himself quickly to avoid vampire attacks. Also, his ability to sense danger, which he developed from his experiences in Hogwarts, would be heightened in this more dangerous Vampire Diaries world.