Adaptation is also a theme. The Hetalia characters have to adapt to the harsh environment of the Attack on Titan world. They may have to change their ways of thinking and behaving. Some fanfics explore how they struggle with this process and gradually become more suitable for this new world.
Another theme is cooperation. The Hetalia characters, who represent different nations, need to work together to face the common enemy - the Titans. This is different from their usual interactions in the original Hetalia series, which adds a new layer of depth to the story.
One common theme is survival. Just like in Attack on Titan, the characters in these fanfics often have to fight for their lives against the Titans. For example, in many fanfics, the Hetalia characters use their unique skills to try and survive in this dangerous world.
One common theme is the clash of different power systems. For example, when crossing over with a magic - based series, the contrast between the Titans' brute force and magic is explored.
One common theme is power struggle. Both 'Attack on Titan' and Marvel have characters with great powers. In the fanfics, it's often about how the powers from 'Attack on Titan' like the Titan - shifting abilities compare and interact with the superpowers in Marvel.
One common theme is loyalty. Pieck is often depicted as being loyal to her comrades and her cause. Another theme is sacrifice, as she is in a situation where she may have to give up a lot for the greater good.
One common theme is identity. The trans characters often struggle with their identity in a world full of danger like Attack on Titan. They have to come to terms with who they are while also fighting Titans.
Well, a cool concept could be the power dynamics. In Hetalia, each nation has its own strengths and weaknesses. When combined with the world of Attack on Titan, those strengths and weaknesses could play out in interesting ways. For instance, a nation known for its military strategy in Hetalia might come up with new battle plans against the Titans. Also, the idea of the Titans being influenced by the Hetalia characters' personalities. Say, a really goofy Hetalia character might make a Titan act in a less menacing way just because it's so confused by the character's antics.
Power struggles are also a common theme. In 'Game of Thrones', it's about the Iron Throne, and in 'Attack on Titan', it's about controlling the Titans or the truth behind them. Fanfic might explore how the power - hungry characters from 'Game of Thrones' would react to the power dynamics in the 'Attack on Titan' world, like Cersei trying to manipulate the Titan - shifters.
One common theme is loss. Given the brutal world of Attack on Titan, Levi might cry over the loss of his comrades. His close relationships with his squad members make their deaths a heavy blow.
One common theme is adaptation. Fem Naruto has to adapt to the very different and often brutal world of Attack on Titan. For example, in many fanfics, she has to learn how to use the 3D Maneuver Gear, which is a huge change from her normal ninja tools.
Sure. 'A Titan's World in Hetalia' is a great one. It combines the intense and dark atmosphere of Attack on Titan with the unique character concepts from Hetalia in an interesting way.
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.