I'm not entirely sure if there is a specific 'natsu and mirajane pregnant fanfic'. Fanfic availability can vary greatly. Some fanfic authors might have explored this idea, while others may not. You could also try reaching out to fanfic communities on social media platforms and ask if anyone knows of such a fanfic.
Yes, there are quite a few. You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Search for the tags 'Naruto' and 'Mirajane' and you'll find a variety of stories. Some might focus on their adventures together in a new world, while others could be about them forming an unexpected friendship or alliance.
One common theme is friendship. Given that Naruto values friendship highly in his own series and Mirajane is also part of a guild where comradeship is important in Fairy Tail. Another theme could be power - how their different powers interact or complement each other. Maybe Naruto's chakra-based powers and Mirajane's take - over magic could be combined in some creative ways in the fanfictions.
It could be a story full of emotions. There would likely be a lot of anticipation and excitement. Natsu might be protective and a bit clumsy in his attempts to take care of Mirajane. And Mirajane would probably be strong yet vulnerable at the same time, dealing with the changes in her body and the new life growing inside her.
Perhaps a dark guild that has been observing Fairy Tail for a long time. They see Mirajane as a valuable asset and believe that her powers can help them in their evil plans. So they plot to kidnap her and force her to cooperate.
The main characters are obviously Natsu and Mirajane. Natsu, who has a dark side in this fanfiction concept, is known for his fiery magic and impulsive nature. Mirajane, on the other hand, is a powerful mage with her demon form capabilities.
There's also a fanfiction where Naruto visits the Fairy Tail guild and forms a special bond with Mirajane. It focuses on their cultural differences at first, like Naruto being from a ninja village and Mirajane from a guild of mages. As the story progresses, they learn from each other and end up going on adventures together, which is really exciting to read.
Show their growth as individuals as well. Maybe the OC is trying to overcome a fear, and Mirajane offers support. This mutual support system is a key part of a realistic relationship. Also, don't rush into the romantic part. Let their friendship develop first. They could share inside jokes, or have a special place in the guild where they always meet. This way, the relationship evolves organically. Another important aspect is conflict. They might have disagreements about how to handle a guild situation, but they work through it, which strengthens their bond.
Maybe Mirajane is kidnapped by a dark wizard who has a vendetta against her family. In the fanfiction, the wizard could be trying to force Mirajane to reveal the secrets of her family's magic. Her Fairy Tail comrades would have to figure out where she is and how to defeat this powerful foe.
For many fans, exploring relationships that are not fully explored in the original show is exciting. Mirajane and Fried both have their own backstories and powers, and seeing how these elements play out in a romantic relationship in fanfiction can be really engaging. For example, Mirajane's transformation abilities and Fried's rune magic could be incorporated in unique ways in a love story. Also, the fanfiction gives the opportunity to see how their characters could grow and develop in the context of a relationship, which adds to the appeal.