There could be an outside force, like a neighboring kingdom that sees Rapunzel's pregnancy as a sign of weakness. They might plot to kidnap Rapunzel or cause trouble in her kingdom while she's pregnant. Their goal could be to take over the kingdom, using her pregnancy as an opportunity to strike when they think the kingdom is vulnerable.
It could be some of the nobles in the kingdom who are not happy with the idea of Rapunzel having a baby so soon. They might fear that the baby will disrupt the line of succession or cause political unrest. So they try to undermine Rapunzel and Eugene during her pregnancy, creating all sorts of problems for them.
Well, the fanfiction could start with Rapunzel having some strange symptoms. When she realizes she's pregnant, it could be a time of great joy for her and Eugene. But then, there are rumors spreading in the kingdom about the baby. Some might think it's a bad omen or have other superstitious beliefs. Rapunzel and Eugene would then have to work together to prove that their family is a positive addition to the kingdom and face all the difficulties that come with the new situation.
One potential antagonist could be those within the village who oppose Naruto's relationships. They might see his harem as a threat to the traditional values of the village and try to cause trouble for Naruto and his partners.
It could be some of the traditional enemies they face. For example, the Foot Clan might see this as an opportunity to target them, thinking that a pregnant April and a distracted Raph would be easier to attack.
Rapunzel's character development in such fanfiction can be quite multi - faceted. Firstly, physically, she has to adjust to the changes in her body, which might make her more in tune with her physical self. Emotionally, she could become more empathetic towards other mothers in the kingdom. She may also become more assertive in ensuring the safety and well - being of her unborn child. For instance, she could start taking a more active role in castle security matters related to the baby. Additionally, her relationship with Eugene will likely deepen as they face this new chapter together, and this could also shape her character further.
The other gods who oppose the relationship between Percy and the goddess could be antagonists. They might see it as a disruption of the natural order or a threat to their power. For example, if the goddess is from a certain pantheon and her pregnancy by a mortal like Percy goes against their rules, those traditionalist gods would be against it.
One possible plot could be that Eugene and Rapunzel are overjoyed at the news of expecting a baby. They start preparing the castle for the new arrival. Rapunzel might paint the nursery with beautiful murals inspired by her past adventures. Eugene, on the other hand, could be seen training the guards to ensure the safety of the future heir. There could also be some challenges like Rapunzel having cravings for rare ingredients which sends Eugene on a quest to find them. And they would have to deal with the expectations of the kingdom as well.
Fanfiction.net is also a good place to look. Just use the search function and type in relevant keywords like 'Tangled Rapunzel pregnant' to narrow down the results.
One possible fanfiction could be about Rapunzel's journey during her pregnancy while still ruling her kingdom. It might explore how she balances her new role as a mother - to - be with her royal duties.
The Capitol could still be the main antagonists. They might see Katniss's pregnancy as a threat, either because they fear the child could grow up to be a symbol of resistance like Katniss or just because they want to maintain control over her. They could try to harm her or the baby in some way.
Their relationship could become even closer. With a baby on the way, they would have to rely on each other more. Flynn would become more responsible, and Rapunzel would see a new, tender side of him.