One major theme is the clash of different worlds. In 'gate ww2 fanfiction', you usually have the world of WW2 with its politics, battles, and ideologies colliding with the world on the other side of the gate. This can lead to all sorts of interesting situations, like alliances being formed between unexpected groups or new forms of warfare emerging. There is also the theme of discovery, as characters discover new things about themselves and their world through their experiences with the gate during the war.
Another theme is love and relationships during the war. Women might fall in love with soldiers or find support in each other. For example, stories often show the emotional connections between female friends in the difficult times of the war.
One common theme is heroism. Just like in the game, characters in fanfiction often display great courage in the face of the war. They fight for their beliefs and comrades.
One common theme is the exploration of different combat strategies. Since it's a crossover, it can combine the tactics from COD WW2 with those from the other crossed - over entity. Another theme is brotherhood among soldiers, which is very prominent in both COD WW2 and often in the other elements it crosses with.
Some common themes in WW1 time travel fanfiction include the alteration of historical events. This could be something like a time traveler trying to save a loved one who died in the war. There's also the theme of cultural clash. A modern - day person suddenly in the WW1 era would face differences in fashion, language, and values. And a prevalent theme is the butterfly effect. A small change made by the time traveler can have huge and unexpected consequences on the course of the war and history in general.
One common theme could be alternate history. For example, how the events of the Familiar of Zero universe might intersect with World War 2 scenarios. Maybe the magic in the Familiar of Zero world could be used in the context of the war, like mages fighting alongside regular soldiers. Another theme might be character crossovers, where characters from Familiar of Zero are placed into WW2 settings and how they adapt to the new environment, like how Louise would handle the chaos and danger of a war - torn world.
Survival is also a big theme. In both Star Wars and WW2, characters are constantly facing life - threatening situations. In fanfiction, this can be explored by having characters from one universe adapt to the survival challenges of the other. For example, a Star Wars character trying to survive in the harsh conditions of a WW2 battlefield. It can show how their skills and abilities are tested in a new and difficult environment.
A common theme is the clash of cultures. Naruto's ninja culture from his world is very different from the military - and magic - based culture in 'The Gate'. So, exploring how these two cultures interact is often seen. For example, Naruto might introduce the concept of chakra to the people of 'The Gate' world.
Well, one of the main themes is the exploration of the human psyche under extreme conditions. WW2 created an environment full of fear, death, and destruction. In crime fiction set during this time, we see how characters' mental states are affected. Also, the theme of resistance against the evil of the Nazis or other oppressive forces is common. Characters might be involved in underground resistance movements that have to deal with traitors and spies, which are elements of crime fiction. And then there's the theme of the search for truth. Discovering the truth about war crimes or hidden secrets during the war is often a driving force in these stories.
The theme of heroism is also prevalent. There are those who risk their lives to save others, whether it's a soldier on the battlefield or a civilian helping Jews escape the Nazis. Additionally, the theme of moral ambiguity is there. The line between right and wrong can get blurred in the chaos of war.
Magic or the supernatural in the context of war is also a theme. In some ww2 fantasy novels, magic might be used as a weapon or as a means of changing the course of the war. It adds an extra layer of intrigue and wonder to the historical setting, like in stories where a wizard tries to prevent the worst atrocities of the war.