Her character could develop by becoming more responsible. Since she's pregnant, she has to think about another life. So she might start making more careful decisions, like not rushing into dangerous situations without a plan.
There's also a chance that it could be a god in disguise. Gods have been known to have relationships with mortals and demigods. So perhaps a god took on a human form and had a relationship with Thalia, resulting in the pregnancy.
One possible plot could be that Thalia has to deal with the shock of the unexpected pregnancy. She might struggle with how it will affect her life as a demigod. For example, she may worry about how she can continue her duties while being pregnant. Maybe she'll also face judgment from some of her peers in the demigod community. She could then start to think about the future of the baby and whether it will inherit her powers or face the same dangerous world she has.
Character development can be demonstrated by Nina's evolving self - image. As her body changes during pregnancy, she might struggle with self - acceptance at first. But over time, she could learn to embrace her new form and see it as a symbol of the life she's bringing into the world. Also, her communication skills could improve. She has to talk to doctors, family, and friends about her pregnancy, and this could make her more assertive and better at expressing her needs and concerns.
One plot idea could be Thalia having to deal with the challenges of being pregnant while still being involved in her heroic duties. Maybe she has to hide her pregnancy from some of her enemies. Another could be exploring how her friends in the story react to the news and support her through it.
One idea could be exploring how their demigod powers are affected during the pregnancy. For example, Percy's control over water might become more erratic due to hormonal changes. Another could be the reactions of their friends and the demigod community. Some might be supportive, while others might fear for the future of the half - bloods. Also, they could face challenges from the gods, as the birth of a new demigod with such powerful parents could shift the power balance in the mythological world.
In a 'pregnant' fanfiction, their relationship would become more complex. There would be new layers of love and responsibility. They would start to see each other in a different light, not just as friends or fellow demigods. Percy might see Thalia as the mother of his child, and Thalia would see Percy as the father. This new perspective would bring out different aspects of their personalities. For example, Percy might show a more nurturing side, and Thalia might become more patient. Their relationship would be tested by the challenges of pregnancy, but also strengthened as they face them together.
Character development can be shown through her relationships. Initially, she might be isolated in the Games because of her pregnancy. But as she meets other tributes, she could learn to trust and form alliances. Her pregnancy could be a catalyst for her to grow as a person. She might become more selfless, putting the needs of her unborn child above her own desires. For example, she could sacrifice her chances of winning the Games to ensure the safety of her child.
The character development could also be shown through their relationships with others. For instance, the character might have had a strained relationship with a family member, but the pregnancy could bring them closer together as they both look forward to the new addition to the family. Or the character could become more empathetic towards other parents in the village, understanding the joys and struggles they face.
She could become more empathetic. Going through pregnancy might make her understand the struggles of other women in the village better. This could lead to her getting involved in initiatives to support pregnant women or new mothers.
Alex could become more assertive in her relationships. Since she's pregnant, she has to make important decisions for herself and her unborn child. So, she might stand up to people more often, like if her friends make inappropriate comments about her situation.