The brothers could develop in their relationships with each other. For instance, they might have to put aside their differences and work together to support the oc during her pregnancy. This could lead to stronger bonds between some of the brothers who previously had rivalries.
Start with small interactions. For example, let them exchange polite greetings at first. Then, gradually add moments of shared interests. If they both like a certain type of tea, have them discover this about each other over a casual tea - drinking session.
Ema may become more mature. With the pregnancy, she has to take on more responsibilities and make decisions for the future of herself and her baby. This could force her to grow up quickly from her initially more innocent self in the 'Brothers Conflict' series.
The OC could also develop in terms of her powers. Maybe the pregnancy enhances or alters her powers in some way. This could lead to new story arcs where she has to learn to control these new aspects of her abilities while also dealing with the physical and emotional changes of pregnancy. For example, if she has telekinetic powers, the pregnancy might make them stronger but less stable at times.
Another possible plot twist is that the oc's pregnancy might be a threat to the family's harmony in a different way. For example, some of the brothers might have plans or dreams that are now put on hold because of the pregnancy, causing conflicts within the family that go beyond just jealousy or rivalry.
Rose could develop by becoming more in tune with her emotions. The pregnancy hormones might make her more sensitive, but she could also learn to use this to her advantage in communicating with Christian. Christian may develop a deeper sense of purpose. Before the pregnancy, he might have been just drifting through life, but now he has a family to care for. He could start taking on extra jobs or learning new skills to better provide for his future family, and this would show his growth as a character in the fanfiction.
During the story, Lilo could develop a stronger sense of family. With the new addition coming, she realizes the importance of family even more. She might start reaching out to her extended family and friends for support. Stitch, on the other hand, could develop a sense of self - sacrifice. He's willing to put himself in danger to protect Lilo and the unborn child, which is a big change from his more self - centered beginnings.
Billy could develop by becoming more responsible. He might start thinking about the future more seriously instead of just his usual carefree self. For instance, he could learn to save money for the baby or start looking for a proper place to live. Mandy, on the other hand, might show a softer side. Usually tough, she could become more nurturing and protective, showing that there's more to her than her intimidating exterior.
Erza could develop more maternal instincts. She might become softer in her approach to things outside of combat. Jellal, on the other hand, could become more confident in his role as a future father. He might start taking on more responsibilities in their relationship.
Martin could develop from being a bit of a carefree person to a more responsible and protective partner. Ruthie might become more self - assured as she takes on the role of a mother - to - be. For example, Martin starts to save money for the baby's future, and Ruthie starts to give advice to other expecting mothers she meets.
Lady could develop a stronger sense of motherly instinct. She might become more cautious and less likely to take risks, always thinking about the safety of her unborn puppies.