You could make an OC that's a journalist who's there to do a story on the lodge. They're initially more interested in getting a good scoop than the safety of the others. But as the nightmarish events start, they realize they need to step up and help. Or an OC that's an artist who uses their art to try to understand and document the strange things happening around them. They might draw symbols they see around the lodge that turn out to be related to the mystery. A third idea is an OC who is a park ranger trainee. They're not fully trained yet but they have some knowledge of the area and try their best to keep everyone alive using their limited skills.
One idea could be creating an OC who is a long - lost relative of one of the main characters. For example, a cousin of Sam who shows up at the lodge with a mysterious past. Maybe they have some hidden knowledge about the events that are about to unfold at the mountain. Another idea is an OC who is a survival expert hired by the parents of the group to secretly keep an eye on them during their stay. This OC could have unique skills and equipment that add an interesting dynamic to the story. Also, an OC who is a spirit medium could be cool. They start sensing the dark presence in the mountains before anyone else and try to warn the others, but no one believes them at first.
An OC who is a foreign exchange student in the group could be an interesting addition. They have different cultural beliefs and superstitions which might play a role in dealing with the supernatural events. For instance, they might know a ritual from their home country that could potentially help. Another thought is an OC that's a hacker. They've hacked into some of the lodge's systems before arriving and discover some strange encrypted files that seem to be related to the dark secrets of the place. And an OC who is a former military brat could bring in a sense of discipline and combat skills, which would be useful in the dangerous situations that occur throughout the night.
You could write a fanfiction about the Wendigo's origin in the Until Dawn universe. It might be interesting to create a story that shows how the first Wendigo was created and how their existence came to be known in that area. Or, a time - travel fanfiction where a character goes back in time to prevent the initial events that led to the chaos in the game. This would involve changing key decisions and seeing how it affects the overall story.
A great plot for Until Dawn crossover fanfiction might be a crossover with the Final Fantasy series. The Until Dawn characters could be transported into the world of Gaia or some other Final Fantasy world. They would have to adapt to the magic and the different races there. They could go on quests, fight monsters, and maybe even meet some of the iconic Final Fantasy characters like Cloud or Tifa. Another idea is a crossover with the Silent Hill series. The Until Dawn group would find themselves in the fog - filled, nightmarish town of Silent Hill. They would have to face their inner demons as well as the grotesque creatures that lurk in the town. And they could also cross over with a detective - themed show like Sherlock. The Until Dawn characters would be involved in solving mysteries in Victorian London, with Sherlock and Watson helping them out.
You could create a fanfiction where Mike has to face his fears alone in the woods. This would be different from the game as in the game he is mostly with other characters. It could be a more in - depth look at his character growth when isolated.
One idea could be that Naruto and his friends are transported to the world of Until Dawn. Naruto's ninja skills would be put to the test against the horror elements of Until Dawn. Maybe he has to use his shadow clones to outwit the monsters in the dark. Another plot could involve the Until Dawn characters learning ninjutsu from Naruto.
A plot could involve a time - traveling scenario. The characters from Harry Potter are sent to the world of Until Dawn, or vice versa. They would have to adapt to the new rules and threats. For instance, Hermione would be trying to figure out the logic behind the Until Dawn horror, while the Until Dawn characters would be in awe of the magic they see in the Harry Potter world. This would lead to a lot of character development and interesting interactions.
The freedom to create is a big factor. Fanfic writers can create OCs that fit into the Until Dawn universe in unique ways. For example, an OC could be a relative of one of the main characters, and this connection can lead to all sorts of new plot twists. Also, OCs can have different reactions to the horror elements. Maybe an OC is more fearless or more superstitious than the original cast, which makes for interesting reading.
One common trope is the 'outsider' trope. The male OC is often an outsider to the main group in Until Dawn. He might be a new arrival in the area or have a different background that sets him apart. Another is the 'protector' trope. He feels a strong need to protect the other characters, especially the female ones. For example, he could be a martial arts expert who uses his skills to fend off threats. And then there's the 'mysterious past' trope. His past is only gradually revealed throughout the fanfiction, keeping the readers guessing.
One common theme is the discovery of new powers. Since it's supernatural, the OC often realizes they have some unique ability that helps them in the Until Dawn situation, like seeing the future or controlling the elements.
An OC with a special power related to nature could join Yona's journey. For example, the OC can communicate with animals and help the group in various situations like finding hidden paths or warning about approaching danger. This would add an interesting dynamic to the group as they face different challenges. The OC could also have a backstory about how they discovered their power and why they decided to use it to help others.
Maybe a male OC who is a healer. He joins Yona's group and uses his unique healing abilities to help the team in various situations. He also has a crush on one of the female characters in the group, which adds some romantic sub - plot.