Yes, there are quite a few. You can start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'Gintoki x Hijikata married' and you'll find a variety of stories. Some might focus on their daily married life, full of comical situations considering their different personalities. Others could be more about how they support each other through difficult times.
Well, in such a fanfiction, there could be various hints. Maybe Zoro's behavior might be more in line with typical female characteristics described in that specific fictional world, like being more empathetic or having different social interactions compared to the original male - character version. But it really depends on how the author has crafted the story.
One common theme is the clash of their personalities. Gintoki is more laid - back and Hijikata is strict, so their daily interactions can be a source of humor. Another theme could be their loyalty to each other. Despite their differences, they stand by one another. Also, the theme of adjusting to married life, like learning to live with someone else's habits, often comes up.
One common plot element is the reaction of the other characters. For example, their friends or family members might be shocked, happy, or worried. Another is how Hijikata and Chizuru themselves deal with the pregnancy, like their fears and hopes.
Zoro.to might have manga, but it's often associated with copyright infringement and potential security risks. It's better to use legitimate platforms for reading manga.
You can try searching on fanfiction platforms like Archive of Our Own (AO3). There are often many different fanfictions about various scenarios, including this one. Just use the search function and type in the relevant tags like 'Hijikata', 'Chizuru' and 'pregnancy' to narrow down the results.
Their relationship in the Zoro x Sanji Christmas fanfic could be presented through a series of challenges and reconciliations. For instance, when they are tasked with getting a Christmas tree for the ship. Zoro wants to just chop down the first tree he sees, but Sanji has very specific requirements. They argue, but then realize that by combining their ideas, they can get the perfect tree. This pattern of arguing and then coming together could be repeated throughout the Christmas celebration, showing the complexity and depth of their relationship.