One common theme is the change in relationships. For example, how the character's partner or friends react to the pregnancy. Another theme is the anticipation and fear of the unknown. Since the Undertale world has its own unique elements, the pregnancy might bring new challenges and uncertainties. Also, the theme of protection often comes up, with the character and those around them being protective of the unborn.
A third theme could be acceptance. Maybe the other characters in the Undertale universe have to accept Undyne in this new state. And Undyne herself may have to accept the changes in her body and life. This could lead to some interesting character interactions and growth within the fanfic.
I'm not sure specifically about Undyne - pregnant fanfics in Undertale. Fanfics can vary greatly in quality and content. Some might explore unique character developments or alternative storylines. However, it's important to note that not all fanfics are well - written or adhere to the original spirit of the game.
One popular 'pregnant undertale fanfic' could be 'A New Beginning'. It focuses on the character's journey during pregnancy in the Undertale universe, exploring how they adapt to the changes and the reactions of other characters. Another one might be 'Expecting in the Underground' which delves deep into the emotions and challenges faced by the pregnant character in that unique setting.
There might be some fanfics out there that deal with this concept in an appropriate way. However, it's important to note that such fan - created content may vary greatly in quality and adherence to the original spirit of 'Undertale'. You can start by looking at some well - known 'Undertale' fanfic platforms and filtering through the stories there.
One potential father could be Asriel. Given their history and connection in the Undertale lore, it's a possibility that some fanfictions might explore this relationship leading to Chara's pregnancy. Another could be a human character that somehow ended up in the Underground and formed a relationship with Chara.
There could be a fanfiction where Frisk gets pregnant in a strange and unexpected way in a unique AU. Maybe it involves some magical elements that are specific to the Undertale world. This could lead to a story of self - discovery and growth for Frisk as they navigate the new situation.
In 'Undertale Pregnant Sans' fanfiction, a frequently seen theme is the relationship dynamics. How Sans' relationships, whether it's with his friends or family (if applicable in the fanfiction's interpretation), are affected. There might also be themes related to the challenges he faces during the pregnancy, like dealing with potential threats in the Underground while being in a vulnerable state. Also, some fanfictions might explore the idea of Sans preparing for the new life that's coming, which could involve everything from gathering resources to making emotional preparations.
Some undertale pregnant chara fanfiction might center around the theme of hope. Chara's pregnancy could symbolize a new beginning for the Underground. It could explore how the different monster species interact with Chara during this time. There could be stories where the monsters come together to support her, or there could be conflicts arising from different beliefs about the pregnancy and what it means for their future. It could also delve into Chara's internal struggle of whether she's ready to be a mother given her complex past.
You can try looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of Undertale fanfictions, and you can use the search function to specifically look for ones related to pregnancy. Just type in 'Undertale pregnant' and it should bring up relevant stories.