Rosie might have a complex personality in the fanfiction. She could be initially scared of the pregnancy but then gradually embrace it. You can show this through her conversations with friends and family. Marco, on the other hand, could be shown as having his own insecurities. Maybe he's worried he won't be a good father because of his own father's absence in his life. As the story progresses, he overcomes these insecurities.
One idea could be that Rosie and Marco are young and newly married. They discover they're pregnant unexpectedly. They then have to deal with the reactions of their families, some of whom are overjoyed while others are worried about their financial stability. They start preparing for the baby's arrival, from choosing a name to decorating the nursery.
For the mother character, you can show her growth from shock at the news to determination to bring all the babies into the world safely. She could start as a timid person but become strong and assertive. The father could be developed by showing his support system for the mother, like taking on extra jobs to afford the upcoming expenses. He might also have his own fears but hides them to be strong for his family.
To develop the characters, start with their backstories. The pregnant woman could have a past that makes her more vulnerable to getting involved with a married man, like a lack of a loving family growing up. The married man might have a backstory of a loveless marriage, which adds depth to his actions. Their interactions are also crucial. As they talk and argue, their personalities can be further fleshed out. For instance, if the woman is feisty and stands up to the man when he tries to avoid responsibility, it shows her strength.
Kiba could be developed by showing his more responsible side. Since he's used to being a bit of a wild ninja with Akamaru, now he has to think about the safety and future of his unborn child. Ino can be developed as she becomes more nurturing. Maybe she starts to use her mind - reading ability in a new way, like sensing the baby's emotions in the womb.
In this fanfiction, Draco's character could be developed through his struggle with his past actions and reputation. The pregnancy forces him to face his new role as a father - to - be. He has to learn to be responsible and caring, which is a big change from his previous cold - hearted self. Ginny, on the other hand, can be developed as she deals with the judgment from others. Her relationship with Draco might make her more understanding of those who were once her enemies, and she can grow in her ability to forgive and move forward.
Marco could be developed by exploring his internal conflict. As a demon, he might have new instincts that go against his human values. For example, he may struggle with the urge to be more aggressive or use dark magic when he used to rely on his wits and martial arts skills.
The pregnant character can be developed by showing her range of emotions. She could start with shock and confusion about the unexpected pregnancy from the experiment. Then, as the story progresses, she might show determination to protect the unborn child or fear of the unknown consequences. Other characters, like the scientists, could be developed through their guilt or curiosity depending on their role in the experiment.
During the pregnancy, Ross's character could develop more of a nurturing side. He might become more gentle and patient, which is different from his usually tough exterior. For example, he could be seen spending more time at home, listening to Demelza's concerns. Demelza, in turn, could become more assertive in her needs for the pregnancy. She would no longer be shy about asking for things like special foods or extra rest.
Lexie might be developed as a more nurturing and cautious character during the pregnancy. Since she's often been portrayed as intelligent and somewhat reserved, this new aspect of motherhood could bring out her softer side. For example, she might start knitting baby clothes or reading lots of parenting books.
One way could be through a magical transformation plot. For example, Marco might find a mysterious spell or artifact that starts the process of changing his gender. This could lead to a series of comical and also self - discovery moments as he adjusts to his new body and the different social expectations that come with being female.