Fanfiction.net is also a place to look. There are many fan - created stories there. However, the search might be a bit more challenging compared to AO3. But with some patience and by exploring different categories and tags, you may be able to find some Armin MPreg fanfics.
One popular Armin MPreg fanfic might be 'Armin's New Beginning'. It often explores the unique situation of Armin in a pregnant state and how he copes with the physical and emotional changes. It could also involve his relationships with other characters, like how his friends support him during this time.
In many fanfics, Annie and Armin's relationship can be complex. It might start from a place of mutual suspicion as they were on different sides initially. But as the story progresses, they could find common ground. For example, they both have a deep understanding of the cruel world they live in. This shared understanding can lead to a more empathetic connection between them.
Another theme is his relationships. His friendship with Eren and Mikasa is frequently explored in different ways. Some fanfics might focus on how his relationship with them changes as they all grow older and face different challenges.
A Jean x Armin fanfic often explores their unique relationship. It might focus on their growth as characters in different scenarios. For example, in some fanfics, they could be on a mission together and develop a deeper understanding of each other's strengths and weaknesses. This type of fanfic can also delve into their emotional bond, perhaps showing how they support each other through difficult times in the fictional world they inhabit.
A Mikasa x Armin fanfic often explores their unique relationship. It could show their deep emotional bond that might have developed over their shared experiences in the story. For example, their mutual understanding of the harsh world they live in and how they support each other through difficult times.
Armin is also usually shown as a character with great determination. He doesn't give up easily, no matter how tough the situation is. He might be facing seemingly insurmountable odds, but he'll keep fighting and trying to find a way forward.
In some fanfics, their relationship develops through a series of shared experiences. They might face a common threat together, which makes them rely on each other. This reliance then turns into a deeper bond. It could be a bond of friendship, where they start to trust and confide in each other. For example, they might share their fears about the future of their world during a long journey.
A common theme is grief. When Armin dies, the other characters have to deal with the intense pain of losing him. Another theme is the idea of sacrifice. His death might be seen as a sacrifice for a greater good.
Another theme could be the impact on relationships. Her being a girl would change the nature of her friendships and interactions. For example, in a story, her male friends might be more protective of her, or she might have different types of rivalries with other female characters. This can create a lot of drama and emotional depth in the fanfic.