A common trope is the 'lost in a new world' trope. For instance, a Star Wars character could end up in the Kingdom Hearts universe and be completely bewildered by the different rules and magic there. Or vice versa, a Kingdom Hearts character in the Star Wars galaxy would be shocked by the technology and different cultures.
Well, one popular trope could be alternate universe scenarios where characters have different relationships or occupations. For example, a story might have Luke Skywalker as a smuggler instead of a Jedi. Another could be the 'what if' scenarios, like what if the Empire had won. However, it's important to note that while fanfic can be creative, it should also respect the original source material's spirit.
There are fanfictions that might focus on the characters from both universes interacting in unexpected ways. Like, Riku meeting Luke Skywalker and learning about the Force from him while also teaching Luke about the power of the heart. This kind of crossover can lead to some really cool character development and plot twists.
The settings can also be combined. For example, a Star Wars planet like Tatooine could be a location in a Kingdom Hearts - Star Wars fanfic. The desolate landscape of Tatooine would provide a contrast to the more colorful and magical worlds in Kingdom Hearts. Characters from both universes would have to adapt to this new environment, leading to exciting adventures.
One possible plot could be that Sora and his friends find themselves in the Star Wars universe. They team up with Luke Skywalker to fight against the Heartless that have somehow invaded the galaxy. Sora's Keyblade could be a unique weapon in this new setting, and they could learn about the Force while sharing their own knowledge of the Heart.
One good example could be a fanfic where the characters from Kingdom Hearts 3 end up in the Star Wars universe. They might interact with Jedi or Sith, like Sora trying to understand the Force. Another example could be a story where the Keyblade wielders team up with the Rebel Alliance to fight against the Galactic Empire. It could add an interesting dynamic to the Star Wars lore with the unique abilities of the Kingdom Hearts characters.
Well, time - travel is a big one in Star Wars fanfiction. Writers like to play with the idea of characters going back in time to change certain events. There's also the 'hidden Jedi' trope, where a character discovers they have Jedi powers that were previously unknown. And of course, the 'enemies - to - lovers' trope between characters from the light side and the dark side.
In Kingdom Hearts OC gamer fanfiction, the 'portal to another world' trope is quite common. Your OC enters the Kingdom Hearts world through some sort of gaming - related portal. This could be a malfunctioning VR headset or a magical game cartridge. The 'team - up' trope is also popular. Your OC teams up with Sora and the gang to fight against the forces of darkness. And the 'lost memory' trope can add an element of mystery. Your OC has lost some of their memories related to their past in the real world or their connection to the Kingdom Hearts world, and they have to regain them throughout the story.
The 'Mysterious Mentor' trope is also prevalent. There's often an older, more experienced character who guides the OC in their journey with the Keyblade. This could be an existing Kingdom Hearts character like Riku, or it could be a new character created specifically for the fanfiction. Additionally, the 'Lost Memory' trope is frequently used. The OC may have lost their memories related to their Keyblade or their past, and the story revolves around them regaining those memories as they progress in their adventure.
Some 'kingdom hearts fanfic' are centered around the Keyblades themselves. They might explore the origin of different Keyblades or the hidden powers within them. There could be a story where a new Keyblade is discovered, and it has a unique connection to an ancient power. This kind of fanfic often dives deep into the lore of the Kingdom Hearts universe.
One popular trope is the 'Force - Bond' where two characters, often a Jedi and another, are connected through the Force in a special way. Another is the 'Hidden Jedi' trope, where a character discovers they have Jedi abilities later in life. 'Time - Travel' is also quite common, with characters going back or forward in time in the Star Wars universe.