Yes, there might be some. You can start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'Thor OC Pregnant' and you'll likely find a variety of stories. However, the quality can vary greatly, so be prepared to sift through some to find the ones that really appeal to you.
One common theme could be the challenges the OC faces while being pregnant in a world related to Thor. It might involve dealing with Asgardian customs or Thor's responsibilities. Another theme could be the relationship development between Thor and the OC during this special time.
One common theme is the struggle with identity. Thor is used to being a strong warrior, and pregnancy changes that self - image. Another theme is the support system, like how his friends and family react. For example, Loki might be initially shocked but then become very protective.
One common theme is adventure. The OC often joins Thor on his quests, whether it's fighting against villains in different realms or exploring uncharted territories. Another theme is self - discovery. The OC usually discovers new things about themselves through their interactions with Thor and the challenges they face.
You can try looking on fanfiction websites like Archive of Our Own (AO3). There are often a wide variety of fanfictions there, and you might be able to find some related to Thor being pregnant. Just use the search function and type in relevant keywords.
Love and family are very common themes. Since Jane is pregnant, it explores how Thor and Jane's relationship deepens as they are about to become a family. It also often shows Thor's protectiveness towards Jane and the unborn child.
One idea could be to create a male OC who is a young warrior from a far - off land. He comes to Asgard seeking to prove himself and catches Thor's attention. They could go on a quest together to defeat a powerful dark magic that is threatening Asgard. The OC's unique fighting style, perhaps influenced by his own land's martial arts, could be a key factor in their victory.
Love and redemption are also common themes. The OC might be a character with a troubled past, and Thor helps them find redemption. At the same time, they fall in love. It's a classic trope that gives an emotional depth to the relationship between the two characters. This can be seen in many 'Thor x OC fanfiction' where the OC has to overcome some personal demons with Thor's support.
One great Thor and OC soulmate fanfiction is 'Soulbound with Thor'. It beautifully portrays the relationship development between Thor and the original character. The author does an amazing job of creating a believable bond between them, with lots of sweet and tender moments.
She can be characterized as powerful. For instance, she could have the power to manipulate cosmic energy, which is far beyond what normal Asgardians can do. This makes her a force to be reckoned with in the fanfiction universe.