Power struggles are very common. Just like in both Star Wars and Game of Thrones, characters in the fanfiction often fight for control over kingdoms or the galaxy. For example, a character might use the lightsaber skills from Star Wars to gain an edge in the political battles of Westeros.
Another theme is loyalty. In both franchises, loyalty is tested. In fanfiction, characters from both universes might have to decide where their loyalties lie when the two worlds collide. For example, a character from Star Wars might have to choose between helping a GoT house or following their own Jedi code.
Family also plays an important role. In 'Game of Thrones', family ties are complex and often a source of conflict or loyalty. In 'Star Wars', family, like the Skywalker family, has a huge impact on the story. In fanfiction, these family elements are often explored further, with crossovers creating new family dynamics between characters from the two universes.
One popular theme is power. Combining the power of the Force in Star Wars with the political and martial power in Game of Thrones makes for an interesting read. Another is the idea of loyalty, like how characters from both series deal with loyalty to their factions.
Power struggles are very common. The characters from both universes are often involved in battles for control, whether it's over a kingdom in Game of Thrones or a territory in the Overlord world.
One common theme is the obsession with the Force. Writers often explore characters who are overly fixated on its power, like a young Jedi who becomes obsessed with unlocking new levels of Force ability. Another theme could be an obsession with a particular character, such as Darth Vader. Fanfic writers might create stories where a character is so obsessed with Vader that they try to follow in his footsteps or redeem him. Also, the obsession with certain planets in the Star Wars universe, like Tatooine, is seen. Some stories may revolve around characters who are obsessed with the secrets or treasures that Tatooine might hold.
Daenerys Targaryen and Rey are often combined. They are both strong female characters with special powers. Daenerys has her dragons and Rey has her connection to the Force. Writers like to explore how they would interact if they were in the same story.
Another theme is the idea of loyalty. In both series, loyalty is a huge factor. In 'Harry Potter and the Game of Thrones' fanfiction, it can be about characters from one series having to choose where their loyalty lies when faced with the situations and characters from the other series. For instance, a character from Harry Potter might have to decide whether to side with a particular House in Westeros or not. It makes for some really interesting character development.
Faith in the Jedi Order as an institution is also a frequent theme. Fanfictions may depict characters who have complete faith in the teachings and structure of the Jedi Order, while others question it. This can lead to internal conflicts within the Jedi community in the story, like in a fanfic where a young Jedi starts to see the flaws in the Order's strict rules regarding emotions.
Power and its corruption is a frequently seen theme. In both universes, power plays a crucial role. In Star Wars, the Force can be misused, and in Lord of the Rings, the One Ring has the power to corrupt. Fanfictions often explore how different characters deal with the allure of power. Also, redemption is a common theme. Characters like Darth Vader in Star Wars or Boromir in Lord of the Rings are often the focus of fanfictions about redemption.
The 'culture clash' trope is quite popular. The different cultures in Star Wars, like the Jedi culture, and the cultures in Game of Thrones, such as the Dothraki culture, can create interesting situations when they interact. Another trope is the 'lost technology' in Game of Thrones being re - discovered by a Star Wars character. It's like a Star Wars engineer finding an ancient weapon in Westeros and trying to figure out how to use it. And the trope of 'fated enemies' can also be explored, where a character from Star Wars is fated to oppose a character from Game of Thrones due to some ancient prophecy or power imbalance.