One aspect to consider in this fanfiction could be the extreme devotion Mikasa has in a yandere state. Yandere characters are known for their obsessive love, and Mikasa's love for Eren was already intense in the original series. In the fanfiction, this might be amplified, leading to situations where she becomes overprotective and possessive of Eren, perhaps even to the point of excluding others from his life. This could create a lot of drama and conflict, especially when Eren's own goals and relationships with other characters are taken into account.
In many Attack on Titan fanfictions, the love between Eren and Mikasa is often depicted in a very intense way. Some fanfictions might show their love growing from their childhood bond. They've been through so much together, like facing Titans and the various challenges within the Walls. Their relationship is complex, with Mikasa being extremely protective of Eren due to her love for him. This love can also be a driving force in some fanfictions, leading them to make different choices compared to the original storyline.
The baby could bring them closer. They'd have a new shared responsibility, which would strengthen their bond. They'd be more focused on each other and the family they're creating.
His apology might initially cause some confusion in their relationship. Mikasa has been used to a certain dynamic with Eren, and this change could throw her off. However, in the long run, it could be positive. They could start to see each other in a new light. Eren might become more protective of Mikasa in return, and Mikasa could be more open with Eren about her own desires and fears. For example, they could start to plan for a future together, something that was previously unthinkable due to the tension between them.
Armin is often a popular character. He might be like a wise uncle figure to Eren and Mikasa's family, offering advice and support. Another could be Levi. He could be the strict but caring mentor to their children, teaching them important skills.
Eventually, Eren might start to investigate the reasons behind Mikasa's betrayal. If he discovers that there are more complex factors at play, like she was forced or there was a misunderstanding, he could feel a mix of guilt for his initial reaction and relief that their relationship wasn't as broken as he thought. However, if he finds out that she truly betrayed him out of her own will, he might become even more determined to carry out his plans, whatever they are, without her.
One great Mikasa and Eren fanfiction is 'A New Beginning'. It shows an alternate universe where they start their relationship earlier. The story beautifully portrays their deep connection and the challenges they face together. It's a really engaging read for fans of the pair.
I would recommend 'Eren and Mikasa's Adventure'. In this fanfic, they embark on an exciting journey together. The plot is full of twists and turns, and the way their characters are written is very in - character. It's a long read but definitely worth it if you're a fan of their relationship.