Perhaps the story could focus on Nike's journey through the pregnancy. She could be worried about how motherhood will change her relationship with Livius. And Livius might be trying to prove himself as a worthy partner and future father, like getting a better job or a more stable place to live for their future family.
In a Nike and Livius pregnant fanfiction, perhaps the pregnancy was unexpected. Nike could be worried about how Livius will react. Livius, on the other hand, could see it as a sign of a new beginning. They might then embark on a journey to find a safe place for their child to be born, as they live in a world where there are constant threats. Along the way, they learn more about each other and strengthen their relationship in anticipation of their new family member.
I'm not sure there are a lot of specific 'Livius and Nike' fanfictions with that exact plot. You could try searching on popular fanfiction websites like Archive of Our Own. Maybe start with searching for 'Livius and Nike' and then look through the results to see if there are any with a pregnancy plotline.
In a pregnant fanfiction, their relationship would experience a significant shift. Livius would be filled with a mix of excitement and worry for Nike and the unborn child. This would lead to him being more present in Nike's life. Nike, in turn, would see a different side of Livius, a more nurturing and caring side. They would have to communicate more about their future, their hopes for the child, and how to handle any potential difficulties. This would deepen their connection and transform their relationship into one that is more centered around family.
I'm not really sure. Maybe there's some kind of promotional partnership or crossover, but I haven't heard of it specifically.
One common theme could be friendship. They might be portrayed as having a deep and meaningful friendship in the fanfic. Another theme could be adventure, where they go on exciting journeys together.
One possible plotline could be that Tinkerbell's pregnancy is a magical accident. Maybe she was exposed to some strange magic that caused this unexpected situation. Another could be that she is in love with a fairy or a character from the Peter Pan universe and they are starting a family together.
One possible plotline could be how Nami and the other Straw Hat crew members react to her pregnancy. Maybe they would be overly protective or excited. Another could be about Nami dealing with the physical and emotional changes during pregnancy while still being part of the crew's adventures.
One possible plotline could be Ursula dealing with the challenges of pregnancy while still maintaining her powerful and devious nature. For example, she might use her pregnancy to her advantage in some scheme against her enemies.
A plotline could involve Mulan's partner and how they support her during the pregnancy. It could also show how Mulan's pregnancy impacts her relationships with the people she has met during her previous adventures. Maybe there are some who are skeptical or some who are very supportive. Also, the story could explore how Mulan prepares for the arrival of the baby in the context of the world she lives in, whether it's the military - based world she was a part of or her family - centered village life.
One possible plotline could be a character accidentally getting pregnant and then having to deal with the reactions of their friends and family. For example, in a 'Victorious' context, a main character like Tori might find herself in this situation and struggle to balance her normal life, like school and her performing career, with the new reality of pregnancy.