Caroline as a human in fanfiction with Klaus can create a really interesting dynamic. It allows for exploration of how a human might interact with a powerful vampire like Klaus. For example, she could be a source of light in his dark world, constantly challenging his views.
One possible fanfiction could be about Caroline, a human, being drawn into Klaus' world in a small town. Maybe she discovers his true nature as a vampire gradually. At first, she's scared but then becomes intrigued by his complex personality.
One common theme is redemption. Klaus, who has a dark past, often seeks redemption through his relationship with Caroline in these fanfictions. For example, in many stories, he tries to change his ways for her.
Well, Klaus is typically depicted as a powerful and mysterious figure. He has his own motives and desires which often collide with the human world. Caroline, on the other hand, is the one who brings out his more human side. She might be a student, or have some other normal human occupation that contrasts with Klaus' otherworldly existence. There may also be some supporting characters from the original story's universe who play roles in either helping or hindering their relationship.
At first, he might be shocked and a bit scared. But then, Klaus would probably become extremely possessive and overprotective. He'd use his power to surround Caroline with security. He might also be a bit more tender towards her than usual, as he realizes the importance of the new life they are about to bring into the world.
One possible plot could be that Caroline discovers she's pregnant while in a relationship with Klaus. They then face challenges from the supernatural community who might see the baby as a threat or an opportunity. Klaus would be overprotective, and Caroline would struggle to balance her newfound mother - to - be status with her own desires and goals.
One interesting plot could be Klaus trying to win Caroline's trust while she is initially very wary of him. For example, he might save her from some danger in the human world, which starts to make her see a different side of him.
There's also 'A New Beginning for Caroline and Klaus'. This fanfic focuses on their journey of self - discovery while being in a relationship. It shows how they overcome personal obstacles and grow together as humans. It's really interesting to see how their vampire - like traits are translated into human characteristics in this story.
Another possible ally could be an older vampire who has a different view on the power struggles among the original vampires. This vampire might see something special in Caroline and decide to help her navigate the complex and often dangerous world of the original vampires.
I don't have enough information to determine who Caroline is in this story. She could be an ordinary person with an extraordinary secret, or a fictional character created for a specific narrative.