One common theme is power - up. The OC often goes through various training or encounters that lead to new power levels, similar to how Saiyans do in the original series.
One interesting 'oc jedi crossover fanfiction' is 'The Jedi in a New Realm'. It has a unique plot where the original character (OC) is a Jedi who gets transported to a different universe. The story is full of action and the OC's struggle to adapt to the new world while still holding onto Jedi values.
One common theme is the clash of cultures. Since it's a crossover, the Jedi culture often collides with the culture of the other world or franchise. For example, Jedi values like non - attachment might be challenged in a world where emotional bonds are highly valued.
Power exploration is another theme. In these fanfictions, the majin oc usually has some unique powers that interact in interesting ways with the elements of the other fictional world they cross over into. It could be something like their majin abilities combining with magic from another universe, leading to new and exciting developments in the story. Also, friendship or rivalry can be a theme. They might form new friendships with characters from the other world or become rivals due to different goals or values.
Power struggle is a very common theme. The OC often has to deal with the power - hungry Sith and find their place in the hierarchy. Another theme is redemption. Sometimes the OC tries to bring some good to the Sith or find a way to break free from the dark side.
One popular theme is the meeting of different fictional universes' characters. For example, a character from a fantasy world like Middle - earth in 'The Lord of the Rings' meeting a character from a science - fiction world like the 'Star Wars' galaxy. Another theme could be the power struggles that occur when OCs (original characters) from different crossovers interact. They might have to compete for resources or influence in the new combined fictional setting.
One popular idea is a crossover between different fantasy worlds, like combining the magic system of "Harry Potter" with the unique races in "Lord of the Rings" for OCs. Another could be a modern - day setting where OCs from a detective story cross over into a superhero universe. And a time - travel crossover, where OCs from different historical periods meet in a single story.
One idea could be an OC from a modern world suddenly getting the Sharingan and being thrust into the Naruto universe. They could use their modern knowledge along with the power of the Sharingan in unique ways, like using technology to enhance the Sharingan's abilities.
One challenge is staying true to the complex world - building of ASOIAF. The lore is so detailed that any deviation might seem out of place. Also, making the OC believable and not too overpowered can be tough.
Another interesting concept is to have an OC gamer from a racing game cross over into a post - apocalyptic action game. The OC would have to adapt their driving skills to navigate the dangerous terrain filled with zombies or other threats. They could use their modified cars from the racing game as a weapon or a means of escape in the new world.