No, it's not appropriate. Fanfiction should focus on positive aspects like character development, friendship, or adventure. Sexual content in fanfic about these characters is disrespectful to the source material and its fans. It can also create a negative and unwholesome environment in the fan community.
The theme of trust is omnipresent. Their trust in each other's abilities is crucial. In many fanfictions, Levi trusts Erwin's strategic plans completely, even when they seem risky. Also, the idea of redemption can be a theme. For instance, if one of them has made a mistake, the other is there to help them redeem themselves, which is a very heart - warming aspect of their relationship in fanfiction.
Well, a very common theme is friendship evolving into something more. In 'levi x hange fanfic', their initial friendship as part of a group gradually turns into a deeper emotional connection. Another frequent theme is the idea of facing challenges together. They are both in a tough world, and fanfics show them relying on each other to overcome difficulties. And there's also the theme of mutual respect. They respect each other's skills and abilities, and this is often highlighted and developed further in these fanfics.
One common theme is friendship evolving into something more. Their initial comradeship in the 'Attack on Titan' series often forms the basis, and then the fanfictions develop it into a romantic relationship. For example, they might start to notice each other's little habits and quirks in a new way.
The fanfiction of Levi and Erwin's back story is filled with interesting details. Levi's past in the Underground gave him a unique perspective on life and survival. When he joined the Survey Corps, he brought that tenacity with him. Erwin, who was more of an idealist, was intrigued by Levi. Their back story could involve how they trained together. Erwin might have tried to instill his strategic thinking into Levi, while Levi taught Erwin some practical combat skills he learned from his tough life in the Underground. This exchange of knowledge and experiences is a key part of their relationship's development in fanfiction.
Well, usually they might focus on the romantic or sexual relationship between Erwin and Levi. But since 'lemon' implies sexual content, it's not something that should be widely promoted. However, in non - lemon fics, characteristics could include exploring their different personalities, how they interact in the military setting, and their loyalty to each other.
Well, I know a fanfic named 'In the Midst of Chaos'. In this 'levi x hange fanfic', it shows their relationship evolving while they face the challenges in their world. It has some really interesting character development for both Levi and Hange. And there's this other one called 'Beyond Duty' that portrays a more emotional side of their connection, which is quite engaging.
One popular Levi x Hange fanfiction is 'A New Dawn'. It explores their relationship in a post - apocalyptic world within the 'Attack on Titan' universe. The story delves deep into their mutual understanding and how they support each other through tough times.
A third theme is sacrifice. Sometimes, Erwin has to sacrifice his own needs or wants in order to help Levi. This could be in terms of time, energy or even putting himself in danger. It shows the selfless nature of their relationship in these fanfictions.
You could write about their friendship, like how they support each other in difficult battles or how they strategize together. This would stay true to their relationship in the original work.