They would become more united as they have a common responsibility. Zoro would be more in tune with Robin's feelings, and Robin would rely on Zoro more for protection.
Their relationship would become more interdependent. Zoro would likely become more gentle and caring towards Nami, seeing her as the mother of his child. Nami, on the other hand, would rely on Zoro more for protection not just for herself but for the baby as well.
Blackbeard could be a great villain. He might see the baby as a threat in the future or want to use its powers for his own evil plans. He could send his crew to kidnap the baby, leading to an all - out battle between the Straw Hats and Blackbeard's crew.
Their relationship would become more complex. They would now have the added bond of being parents. They would need to rely on each other more, not just as partners in fighting crime but also in raising a child. For instance, they would have to make joint decisions about the baby's upbringing, like what school to send it to in the future.
Their relationship would likely become more deeply connected. Having a baby together means they share a new level of responsibility. They would need to rely on each other more, and their bond would strengthen as they face the challenges of parenting.
In this fanfiction, the pregnancy could be a result of a deep emotional bond that developed between Zoro and Robin over time. The crew might be initially shocked but then very supportive. The baby could become a symbol of a new beginning for the Straw Hats. There could be challenges like protecting the baby from other pirates or the World Government who might see the child as a threat due to its parents' reputations. Also, the baby could bring out a softer side of Zoro and Robin, and they could learn a lot about themselves as they become parents.
In the fanfiction, the baby could have some unique abilities inherited from both Zoro and Robin. For example, it could have Zoro's sense of direction in combat and Robin's ability to read ancient texts. This could lead to many interesting adventures as the crew tries to understand and help the baby develop these powers.
In Robin x Zoro fanfiction, their relationship can be really interesting. Robin is the intellectual and mysterious one, while Zoro is the strong and determined swordsman. Their interactions might start from a simple comradeship on the Straw Hat crew. Maybe in some fanfictions, Robin's knowledge could help Zoro in his swordsmanship journey, like providing him with historical information about some special swords or fighting techniques from the past.
The relationship between Zoro and Robin in the manga is one of colleagues and fellow pirates. They have a professional rapport and rely on each other's skills when needed. There's no romantic or overly personal connection, just a functional teamwork for the success of their voyages.
In the comic, Robin and Zoro have a sort of mutual respect. They might not always see eye to eye, but they recognize each other's skills and contributions to the group's goals. Their interactions often add depth to the story.
One great Robin and Zoro fanfiction is 'The Unlikely Alliance'. It shows how their different skills and personalities complement each other during a difficult adventure on an uncharted island. The story has a great mix of action and character development.