Perhaps the reader has a unique ability to communicate with horses. Since horses are crucial in the Attack on Titan world, Levi realizes the value of the reader's skill. They embark on a mission together to rescue some stolen horses from bandits. During this adventure, they rely on each other's strengths, and the reader gets to see Levi's more protective and caring side, which starts a new chapter in their relationship.
One plot idea could be the reader being from another world and having some unique knowledge or ability that helps in the fight against Titans. For example, knowledge of advanced weaponry or strategic thinking that's not common in the Attack on Titan world.
There are several great ones. You can check out Archive of Our Own (AO3). Search for 'Attack on Titan Levi x Reader' and then filter out the mature or lemon content. There are often heart - warming stories about their relationship development, like ones where they go through training together and gradually form a deep bond of friendship that could potentially turn into something more.
Some great Levi x Reader fanfics in the Attack on Titan universe often focus on their relationship development. For example, 'The Captain's Trust' which shows how the reader character gradually earns Levi's trust during their time in the Survey Corps. Another one is 'A Chance Encounter' that starts with a chance meeting between the two and how their relationship evolves from there.
Create a believable plot. Since it's set in the Attack on Titan universe, there should be elements related to the Titans, the military, and the overall struggle for survival. For example, the reader could be involved in a mission against the Titans, and that's where their relationship with Levi starts to develop.
One great 'Attack on Titan Levi x Reader Fanfiction' is 'A Chance Encounter'. It beautifully portrays the relationship between Levi and the reader. The story starts with the reader being a new recruit and Levi taking notice. It's filled with great character development and sweet interactions.
One interesting storyline could be them teaming up against a new, extremely powerful type of Titan that neither has faced before. They have to learn to trust each other's instincts and fighting styles completely.
One interesting storyline could be them teaming up for a dangerous mission. They both are highly skilled, and seeing them work in tandem, relying on each other's strengths, would be exciting. Levi's experience and Mikasa's determination could lead to a great adventure where they face off against new Titans or a mysterious enemy within the walls.
Here's another one. The OC could be an artist who is commissioned to create a large - scale mural for KaibaCorp. Kaiba is initially dismissive of the art project, seeing it as a waste of resources. However, as the OC works on the mural, Kaiba starts to see the value in art as a form of expression and communication. The OC also gets to know Kaiba on a more personal level as they discuss the concept and design of the mural. Their relationship evolves from Kaiba's initial indifference to a mutual admiration and friendship.
A possible plot could involve Optimus Prime being mistaken for a new type of Titan at first. The characters in Attack on Titan initially fear him but then realize he's an ally. He could then help in fortifying the walls with his super - strong materials. This would create a new dynamic in the story as the people of the Attack on Titan world have to adapt to having this powerful being around and figure out how to work with him.
One idea could be that the characters from Bnha are transported to the Attack on Titan world. They could use their unique quirks to fight the Titans in ways the AoT characters haven't seen before. For example, Deku could use One for All to launch himself at Titans with incredible force.