One common theme is loyalty. Armin and Erwin are both extremely loyal to their comrades and to each other. In fanfics, this loyalty often becomes a central aspect of their relationship. Another theme is leadership. They are both leaders in their own ways, and fanfics might explore how they lead together or support each other's leadership.
One popular 'Attack on Titan Armin x Erwin fanfic' is 'The Bonds Beyond the Walls'. It delves deep into their relationship, exploring how they support each other during the tough times in the Survey Corps. Another great one could be 'Shared Visions' which focuses on their strategic minds working together and how that draws them closer on an emotional level.
In many Attack on Titan fanfics about Levi and Erwin, their relationship is often complex and deep. Levi respects Erwin's leadership skills and strategic mind. Erwin, on the other hand, trusts Levi's combat abilities. Their relationship can be seen as a partnership that is crucial for the Survey Corps. They support each other in the face of the Titans and the many challenges within the walls.
One popular trope is the 'unspoken understanding' between them. They can communicate with just a look during crucial moments in battle or decision - making. Another is the 'protective Levi' trope, where Levi is always ready to defend Erwin from any threat, whether it's a Titan or a political enemy within the walls.
One common theme is loyalty. Levi is extremely loyal to Erwin, and this loyalty is often explored in different scenarios in fanfics. Another theme is sacrifice. Given the dangerous world of Attack on Titan, either Erwin or Levi might be put in a position where they have to sacrifice for the other or for the greater good. Also, friendship and comradeship are common. They support each other through tough battles and difficult decisions.
One common theme is redemption. Annie has done some pretty bad things in the series, and in many fanfics, Armin is a key figure in her journey towards redemption. Another theme is love in the face of chaos. Given the world they live in, filled with Titans and danger, their love is often portrayed as something that can survive and even thrive in such a harsh environment. Also, the theme of understanding each other's pasts is quite common. They both have complex backstories, and fanfics often explore how they come to understand and accept each other's past traumas.
In many Attack on Titan fanfics, the relationship between Erwin and Levi is complex. They are comrades with deep mutual respect. Erwin is the strategic mastermind, while Levi is the powerful fighter. Their relationship is often depicted as one of trust, as Levi follows Erwin's plans without hesitation in the face of Titans. They also share a sense of comradeship that goes beyond the normal soldier - soldier bond, which makes for very interesting dynamics in fanfics.
Some fanfics might explore a romantic relationship between them in a more secretive or forbidden way. Given the military setting and the overarching plot of Attack on Titan, their relationship might be something they have to hide. This adds an element of tension and drama to the story, as they navigate their feelings while also dealing with the threats of the Titans and the politics within the walls.
One popular theme is the growth of their relationship. Starting from distrust or indifference and evolving into a deep friendship or something more. Another theme could be them facing challenges together, like a particularly difficult Titan attack where their combined skills are put to the test. Also, the theme of sacrifice might be present, where one is willing to sacrifice for the other in a life - or - death situation.