I really like 'Klaus Hargreeves: A New Beginning'. This fanfic takes Klaus out of his comfort zone in the Academy and places him in a new and unfamiliar setting. It shows how he adapts and grows as a person. Also, 'Klaus' Unseen Adventures' is quite good. It fills in the gaps of the show's story, showing parts of Klaus' life that we didn't get to see on screen.
Well, it needs to have an engaging plot. Maybe it's about Klaus going on a solo adventure where he has to face his demons without the help of his siblings. It could also involve new characters that interact with Klaus in interesting ways, like a mysterious mentor figure who helps him control his powers better.
The darkness in the character of Klaus Hargreeves adds an extra layer of complexity. In the fanfiction, it can explore his traumas, his powers in a more sinister way, and his relationships in a more conflicted manner.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). There are often tags related to 'Dark Klaus Hargreeves' which can help you narrow down the search. Many talented writers post their works there.
Klaus may be overjoyed. Given his complex character, he might see this as a new beginning, a chance to create a family of his own in a way he never thought possible. He could immediately start making plans to ensure Caroline and the baby are well - cared - for.
Klaus might be initially shocked. He's used to a life of danger and chaos, and a pregnancy would be a huge change. But then he would become very protective. He has a complex personality, but deep down he cares about Cami, so he'd do everything in his power to keep her and the unborn baby safe.
Klaus might be overjoyed. Given his feelings for Caroline, the news of a baby could be the best thing he's ever heard. He'd probably immediately start thinking about how to take care of Caroline and the child, using all his resources.
Klaus would be very attentive to Caroline's pregnancy cravings. He'd see it as his duty to take care of her during this time. He might cook for her himself if he can, or take her to the best restaurants to get what she wants. He would be a bit overprotective too, making sure that whatever she eats is of the highest quality and safe for her and the baby. He'd also listen intently to her when she talks about her cravings, finding it endearing and a sign of the new life growing inside her.
Klaus might be initially shocked. He has so much on his plate already with his power struggles and family issues. But then, his protective side would likely kick in. He's a very possessive character, and the idea of having a child with the reader would make him determined to keep her safe at all costs.