The OC (Original Character) is the other main character. This is a character created by the fanfiction writer. Their personality, backstory, and how they interact with Thorin and the other dwarves form the core of the story.
A common theme is adventure. Since Thorin is often on a quest in Middle - earth, the oc gets swept up in these adventures. For example, they might be traveling with him to reclaim Erebor. Another theme is love against the odds. Thorin is a dwarf king with many responsibilities, and the oc is an outsider, so their relationship faces many challenges.
Well, the cultural clashes and integrations can be really interesting in this type of fanfiction. The OC, coming from an unknown background, has to adapt to the dwarven culture which is rich in traditions, from their feasts to their religious beliefs. And Thorin, on the other hand, has to deal with this new individual in his clan. This interaction between different cultures and personalities can create a lot of engaging storylines.
One common theme is adventure. Since Thorin is often on some sort of quest, the OC usually gets involved in these grand adventures. They might face orcs, dragons, or other perils together. Another theme is redemption. Thorin has his own flaws and sometimes the OC helps him in his journey of self - discovery and redemption.
One great Thorin OC injured fanfiction might be 'The Wounded King' where the OC nurse Thorin back to health after a battle injury. It has great character development and emotional depth.
You can try Archive of Our Own (AO3). It has a large collection of fanfictions including many about Thorin and OC situations where he is injured. Just use the search function and type in relevant keywords like 'Thorin OC injured'.
First, you need to create a well - developed OC. Decide on their personality traits, especially the ones related to possessiveness. Are they jealous easily? Do they have a strong sense of ownership? Then, think about the relationship with Hisoka. How did they meet? What draws them to Hisoka? After that, plot out the story. For the possessive part, you can have the OC react strongly to any perceived threat to their relationship with Hisoka. For example, if another character flirts with Hisoka, the OC could glare at them or even start a small confrontation.
Themes like acceptance play a major role. The OC has to be accepted by Thorin and Company, and vice versa. There's also the theme of purpose. In the modern world, what is Thorin's purpose? What about the OC? They may find that their purposes are intertwined. And the theme of mystery is often present. There could be a mystery surrounding the dwarves' appearance in the modern world or something related to the OC's past that they all have to figure out together.
Adventure is a common theme. Since Thorin is often on a quest, the OC can be part of that journey. For instance, they could face orcs together, and this shared danger brings them closer.
One popular 'thorin x oc fanfiction' is 'A New Beginning in Erebor'. It tells the story of an original character who finds herself in Middle - earth and becomes involved with Thorin. The character development is really well - done, and the relationship between the oc and Thorin unfolds in a very natural way.