Cat could start to show a more responsible side. She might learn how to cook healthy meals for the baby and manage the household better. Robbie could grow in his patience. Dealing with a baby can be frustrating at times, but he would learn to stay calm and handle the situation.
As the story progresses, Cat could become more confident in her parenting skills. She might start to take the lead in making decisions about the baby's upbringing. Robbie would likely develop a deeper bond with the baby. He might be the one to take the baby out for walks and teach it about the world around them.
The fanfiction could start with Cat and Robbie finding out they are going to have a baby. Then it might focus on their preparations, like decorating the nursery. As the baby arrives, there could be cute moments of them learning how to feed and bathe the baby. And in the end, they could be a happy family with their new addition.
Damon would likely become more protective and responsible. He might start to see the value in a more stable life. Elena would grow in her maternal instincts and become even more of a force to be reckoned with when it comes to protecting her family.
Travis might become more responsible. He could go from being carefree to being very protective of his family. Katie, on the other hand, might become more patient as she takes care of the baby.
Castle might become more responsible. He was always a bit of a carefree writer, but with a baby, he has to grow up a bit. Beckett, on the other hand, could become more empathetic. She was tough as a detective, but motherhood softens her edges.
Lexa would likely become more protective and perhaps a bit softer in her approach. She has always been a strong leader, but now she has a family to think about. Clarke, on the other hand, would probably use her medical knowledge more to take care of the baby. Her nurturing side would be more prominent.
Pacifica might become more empathetic. Before having a baby, she was a bit spoiled. But now, she has to think about someone other than herself. Dipper, on the other hand, could become more responsible and protective. He was always the curious one, but now he has a family to look after.
Ichigo might develop more patience and a softer side as he becomes a father. He was always brave in battle, but now he has to be gentle with a tiny baby. Yoruichi, on the other hand, could become more nurturing. She was always independent and strong, but with a baby, she shows her maternal instincts.
For Jane, she could develop a greater sense of patience. Babies can be unpredictable, and she'd have to learn to handle that. Maura might become more empathetic towards other parents, understanding the joys and struggles better. They both would likely become more family - oriented, with their decisions now revolving around what's best for the baby as well as themselves.
Buffy would likely become even more protective and fierce. Her slayer side would blend with her motherly instincts. Willow would grow in confidence as she uses her magic to care for the baby. She might also become more assertive in protecting their family.
As the baby grows, it could also influence the development of Beauty and the Beast. For instance, the baby's need for a normal life could push the Beast to be more involved in the outside world, and Beauty might have to learn how to balance her family life with the challenges of the outside world. Their love for the baby would be a driving force for their own personal growth and the growth of their relationship.