Relationships are a big theme. It could be her relationship with her partner getting stronger or more complicated. Also, her relationships with friends and family might change as they all adapt to the situation. Another theme could be her growth as a person. The experience of pregnancy might make her more responsible and mature in the fanfiction.
One idea could be a story where Marinette discovers she's pregnant unexpectedly. It could focus on her initial shock and how she decides to tell Adrien. Maybe she's worried about his reaction and how it will affect their relationship and their superhero lives.
Marinette might develop more empathy. Going through pregnancy gives her a new perspective on life. She may understand the struggles of others better, like those who are vulnerable or in need of protection, which could influence how she acts as Ladybug.
It could also be about the challenges they face during the pregnancy. Marinette might have health issues, and Adrien has to be extra careful and supportive. There could be a lot of emotional turmoil as they both grow up faster than they expected. They might also face some judgment from society, but they stand strong together to face it all.
One possible plot could be Marinette struggling to raise the baby on her own while dealing with the heartbreak of Adrien leaving. She might find support from her friends like Alya, who helps her through the tough times. Meanwhile, Adrien could be off on some self - discovery journey and later realizes his mistake.
Finding the best 'pregnant Marinette fanfiction' can be a bit of a hunt. You could start by looking at fanfiction communities dedicated to the show she's from. These communities often have curated lists or recommendations. Also, consider reaching out to other fans who might be able to point you in the right direction. They may have their own favorite stories that deal with this unique concept.
One possible plot could be Marinette dealing with her superhero duties while being pregnant. She might have to be more cautious in battles, and her teammates could be extra protective. For example, Chat Noir might be constantly on the lookout for any danger that could harm Marinette and the unborn baby.
The relationship with Adrien is a huge theme. It could be about how they navigate their relationship when this big change occurs. Some fanfictions show them having to grow up quickly and become more responsible for each other and the baby. It also might explore how their identities as Ladybug and Chat Noir play into their new family situation.
One popular storyline could be about how they navigate their new relationship while dealing with the pregnancy. Maybe they face challenges from family and friends who might not be fully supportive at first. Another could be them preparing for the baby, like decorating the nursery together. There could also be a storyline where Marinette's creative side is influenced by the pregnancy, and she creates new fashion designs inspired by the upcoming baby.
They would become even closer. Their love would grow deeper as they are about to start a family together. There would be more tender moments between them.