It could be that the kids are actually from the future of a world where the war was averted. They go back to meet Eren and Levi to understand how the change was made possible. Eren and Levi in this pre - war state might be on the cusp of making decisions that could lead to either war or peace. The kids' presence could tip the balance towards peace as they share insights from their future world about the consequences of war and the importance of unity.
One possible plot could be that the kids somehow get transported back in time. Maybe through some magical or mysterious power. They meet Eren and Levi before they've been hardened by war. Eren might be more idealistic and naive, while Levi could be less jaded. The kids could learn about their pasts, their hopes, and dreams, and perhaps even change the course of future events by influencing them in some way.
Eren would probably be very curious. He's always been eager to learn and understand new things. Meeting kids from another time would be fascinating for him. He might ask them a lot of questions about their world and how it differs from his. Levi, on the other hand, would be more guarded. He'd be suspicious at first, but once he realizes they're not a threat, he might start to warm up and show his more protective side towards the kids.
Maybe Levi is a criminal in the sense that he's part of an underground rebellion against an unjust regime. Eren, who is initially on the side of the establishment, meets Levi and gradually comes to understand his motives. Their relationship could develop as Eren has to decide whether to side with Levi or stay loyal to the regime, all while a romantic connection forms between them.
One possible plot could be that Levi takes on the role of a father figure to baby Eren. He might teach Eren about the world they live in, the importance of survival skills, and values like loyalty and courage. For example, Levi could show Eren how to navigate the dangerous terrain outside the walls, all while protecting him from potential threats.
One idea could be a story where Levi and Eren are on a dangerous mission together. They start off not getting along well due to their different personalities. Levi is strict and methodical while Eren is impulsive. But as the mission progresses, they gradually learn to understand and rely on each other. For example, Eren might save Levi from a Titan in a moment of quick thinking, and Levi in turn teaches Eren some crucial combat skills.
One idea could be that Eren is a wild wolf and Levi is a hawk. The wolf (Eren) is seen as a bit of a rebel in the forest, always exploring new areas. The hawk (Levi) is a very observant and strict protector of the forest. Their paths cross when the wolf unknowingly ventures into a restricted area that the hawk guards. This could lead to a series of interesting encounters as they initially misunderstand each other but gradually come to respect one another's place in the ecosystem.
It's hard to say. 'Levi x Eren' fanfics are quite common in certain fandoms, but the 'Levi is a criminal' aspect makes it a more specific and perhaps niche sub - genre. If there are a lot of fans who like to see dark or morally ambiguous takes on the characters, it could potentially be popular within that subset of the fandom. However, it also might not be mainstream popular as it goes against the more typical heroic portrayals of the characters.
To develop their relationship realistically, let them communicate. Have them have conversations about their pasts, their goals. Eren might talk about his family and his drive to avenge them, and Levi could share some of his own traumas from his past. This would create a deeper understanding between them. Also, small acts of kindness like Levi patching up Eren's wounds after a fight or Eren getting Levi his favorite tea could strengthen their bond.
One plot idea could be that Levi is a famous singer and Eren is a huge fan. Eren somehow gets backstage access and they strike up an unlikely friendship that turns into more over time.
One common theme is the struggle with their different personalities. Eren is often impulsive while Levi is more reserved, and their relationship development around this contrast is a frequent theme.
Well, perhaps the plot involves the doctors coming together to assist the war doctor in a particularly difficult situation. They might face challenges like lack of resources and a large number of patients. The story could show how they combine their skills to overcome these difficulties. For example, the regular doctors could offer their expertise in civilian medicine while the war doctor could teach them about handling traumas quickly in the field.