One possible theme could be family. With the pregnancy during Christmas, it might focus on the idea of starting a new family or expanding an existing one during the festive season.
Another theme could be sacrifice. If there's an operation involved, characters might have to sacrifice something for the pregnancy to be successful or for the well - being of the unborn child during Christmas time. Maybe they sacrifice their own personal goals or safety in the context of this fanfiction. Also, the theme of hope could be present. Christmas is often associated with hope, and a new pregnancy can bring a lot of hope for the future in the story.
I'm not entirely sure specifically as it could be a very niche or unique fanfiction. It might involve a Christmas - themed story where a character gets pregnant within the context of some sort of operation or plan during the Christmas season.
A common theme could be the struggle between his normal self and his Hulk side during the pregnancy. He has to manage his emotions and powers carefully.
It's hard to say there are really 'popular' themes specifically for pregnant and orc LotR fanfiction as it's a rather niche combination. But perhaps a theme could be the challenges of an orc pregnancy in a world filled with war and danger like Middle - earth. Another could be the acceptance or rejection of a pregnant orc within orc society.
One common theme could be the challenges of motherhood. Given Elsa's past and her unique situation, exploring how she overcomes her insecurities to be a good mother could be a popular theme. Another might be the relationship changes, especially with her sister Anna, as she embarks on this new journey of pregnancy.
The theme of hope is also popular. In a universe filled with conflict, her pregnancy can symbolize a new hope for the future. The fanfic could show how her pregnancy gives others in the galaxy a reason to keep fighting for a better world.
Another theme could revolve around the support and reactions of other Overwatch characters to a pregnant character. Some might be protective, while others could be concerned about how it would impact the overall mission. This can add a lot of drama and character development to the fanfic. Also, there could be themes related to the challenges a pregnant character might face in a world full of battles and super - powered beings.
One common theme is the celebration of the season combined with the anticipation of the baby. In these fanfictions, you often see the pregnant character involved in Christmas traditions like baking cookies or going to church on Christmas Eve. At the same time, they are also preparing for the baby, like shopping for baby clothes or reading parenting books. Community support is also a theme, as in hallmark stories, the small - town community usually comes together to support the pregnant woman.
I'm not sure specifically if there is a 'Marrying Father Christmas Pregnant' fanfiction. There are countless fanfictions out there on various platforms, but this seems like a rather unique and perhaps not so common theme. You could try searching on major fanfiction websites like Archive of Our Own or FanFiction.net to see if anything comes up.
I'm not sure if there are extremely popular ones in the mainstream sense. But within the niche of minion fanfiction, there could be some that have a following. It might be hard to find them as it's a rather specific and perhaps not as widely - known concept compared to more general fanfiction.
I'm not sure specifically which ones are the most popular. But usually, the ones that are well - written and stay true to the 'Frozen' spirit while also handling the pregnancy aspect in an interesting way tend to gain more attention. It could be a story that has a lot of emotional depth, like exploring the fears and hopes of the pregnant character in the 'Frozen' universe.