One common theme is friendship. Despite their differences, they often form a deep friendship in the fanfictions. For example, in many stories, eren's impulsiveness and levi's stoicism complement each other and they learn from one another.
Another theme is loyalty. They are usually very loyal to each other, whether it's in battle or in facing the political intrigue within their world. A lot of fanfictions play around with how far they will go to protect each other.
One common theme is friendship. They often start as comrades and gradually develop a deeper bond. For example, they might start by just respecting each other's fighting skills and then move on to really caring about each other's well - being.
One common theme is the adjustment to married life. Since they have different personalities, like Levi being more reserved and Eren more impulsive, they have to learn to understand and compromise with each other. Another theme is the protection of their relationship from external threats, whether it's other people's opinions or dangerous situations in the story's world.
The theme of secrecy is quite prevalent. Since vampires are often hidden from the human world, Eren and Levi have to keep their relationship and their true natures a secret. This adds a layer of mystery and tension to the fanfiction. Also, the exploration of what it means to be a vampire, like the need for blood and the immortality, is a common theme that authors like to play with in these fanfictions.
One common theme is the exploration of forbidden love. Given their positions and the nature of their relationship in the original story, a kiss between them can be seen as something that goes against the norm. Another theme could be the power dynamics. Levi is often in a position of authority, and a kiss with Eren can shift or redefine those power dynamics in interesting ways.
A third common theme could be loyalty. Eren, as Levi's pet, might show extreme loyalty towards Levi. This loyalty could be tested in various ways, such as when Eren is faced with difficult choices or when there are misunderstandings between them. It could also be a source of conflict if other characters question or try to break this loyalty.
A common theme is the idea of found family. Levi and Eren, who may not be related by blood, come together to form a family unit. This often involves themes of loyalty and trust.
One common theme is friendship. Despite their different backgrounds and personalities, they form strong bonds. For example, in many fanfics, they rely on each other during battles.
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.
The theme of self - discovery for Eren is quite common. With Levi always hovering, Eren might initially feel stifled but then realizes that Levi's overprotection is a form of love. This realization helps Eren understand his own worth and his place in the world around him. And there could be the theme of redemption as well. If Eren has made mistakes, Levi's overprotection can be a way for Eren to redeem himself under Levi's watchful eye.
Another theme is redemption. Sometimes, Eren might be portrayed as having made mistakes and Levi is the one to guide him towards redemption. It shows the growth of Eren's character with Levi's help. This theme gives a lot of depth to their relationship.