Yes, there are quite a few. Some explore Oberyn Martell's journey in the Harry Potter universe. For example, there are fanfictions where he might be a visiting wizard from a different magical land and gets involved in the Hogwarts affairs. You can find them on popular fanfiction websites by using relevant tags.
One common theme could be forbidden love. Given the setting in which Oberyn Martell exists, a gay relationship might be frowned upon in that society, adding an element of secrecy and danger to the story.
The unique combination of two different fictional worlds. Harry Potter has its own magic system, while Oberyn Martell comes from a world with a different set of values and a more medieval - like political structure. When combined in fanfictions, it creates a new and exciting dynamic.
I'm not sure about specific Oberyn Martell gay fanfics. But you can try searching on fanfiction websites like Archive of Our Own. They have a large collection of fan - made stories and you might be able to find some related to Oberyn Martell's gay relationships there.
There might be some Oberyn Cersei fanfiction out there, but the 'lemon' aspect makes it a bit tricky. Fanfiction websites usually have rules against explicit content. You could try looking for more general Oberyn Cersei fanfiction that focuses on their power dynamics, their possible interactions given their characters in the show or books, rather than seeking the 'lemon' type which is likely to be hard to find in a legitimate and clean - cut way.
Well, an Elia Martell x OC fanfiction can be really interesting. Usually, it allows the writer to explore new storylines that might not be possible within the original canon. For example, the OC can bring in a fresh perspective, perhaps a different culture or set of skills that interact with Elia Martell's world in unique ways. It can also delve deeper into the character of Elia Martell herself, showing her in different situations and relationships that we didn't see in the original story.
Fanfiction.net is also a place to check. While it has a wide variety of content, you can usually find Oberyn Cersei fanfiction that is more about their relationship in the context of the 'Game of Thrones' plot. Look for tags like 'character study' or 'relationship exploration' rather than anything that might suggest adult content. Another option is to join 'Game of Thrones' fan groups on social media platforms and ask for recommendations for clean Oberyn Cersei fanfiction.
In a fanfic, if Oberyn wins, he may also decide to take Sansa Stark under his protection. He could see her as a key to future political stability. With Sansa in Dorne, he could use her claim to the North to form a coalition against the Lannisters, uniting the North and Dorne against their common enemy.
Common themes in Elia Martell x OC fanfiction include redemption. Maybe the OC is there to help Elia find some form of redemption or peace after the tragedies she faced in the original story. Power dynamics is also a theme. The OC might have a different level of power or influence compared to Elia, and how they navigate that in their relationship can be an interesting plot point. Additionally, cultural exchange can be a theme. If the OC is from a different culture, how they introduce new ideas and traditions to Elia and vice versa can be explored.
They can be combined by creating a story where Arianne Martell is a transfer student to Hogwarts. She comes from a different magical culture and has different magical techniques that she shares with the students at Hogwarts. Harry Potter could befriend her and they could learn from each other.