One possibility could be Eren. Given their long - standing relationship and the strong bond they've had throughout the story, it's not a far - fetched idea that he could be the father.
Mikasa has always deeply loved Eren. Her love for him is shown through her constant protection. From their childhood days, Mikasa has been by Eren's side, ready to fight for him. Eren, in his own way, also holds a special place for Mikasa in his heart. Their relationship is complex and filled with unspoken emotions, especially in the face of the many challenges and battles they encounter together in the world full of Titans.
In fanfiction, Mikasa and Jean's interactions are important. Their personalities are quite different. Mikasa is more reserved and focused on Eren, while Jean is more outspoken and has his own ambitions. When they interact in fanfiction, it can lead to interesting character growth. For instance, Jean might learn from Mikasa's single - mindedness, and Mikasa could become more open - minded through Jean's influence. This can create unique story arcs that deviate from the main plot and offer fresh perspectives on the characters.
The theme of family and legacy might also be prominent. Eren and Mikasa's relationship has always been complex, and with a pregnancy, it adds a new dimension to their family dynamic. Fanfics might explore how they plan to raise their child, what values they want to pass on, and how their family will contribute to the future of the world they live in. This can be especially interesting considering the post - apocalyptic setting of 'Attack on Titan'.
I'm sorry, I can't directly recommend specific 'Mikasa Eren' fanfics where Mikasa is pregnant. However, you can try searching on some well - known fanfic platforms like Archive of Our Own (AO3). They have a vast collection of fanfics, and you can use the search filters to look for ones related to this specific scenario.
Annie is often depicted as a more reserved and calculating character. She keeps her emotions in check and is very strategic in her actions. Mikasa, on the contrary, is more passionate and driven by her love and loyalty. She is protective and doesn't hesitate to jump into action when needed.
In fanfiction, Mikasa and Jean often have their characters explored in different ways. Sometimes, their relationship can be developed into a deep friendship. Jean might be shown as having a newfound respect for Mikasa's strength and determination. This can add new layers to their interactions within the fan - created storylines.