One idea could be that the OC has a hidden past that somehow links to Sawyer's own backstory. For example, the OC was involved in the same con that Sawyer was once a part of but on the other side of the deal. This could create a lot of tension and mystery as they interact.
Maybe the OC is a healer in the Lost world and Sawyer initially distrusts them but gradually comes to rely on them. The OC could have some special powers or knowledge that helps the group, and Sawyer's relationship with them could develop from skepticism to friendship and maybe more. This would add an interesting dynamic to the story.
One idea could be that the OC (original character) is a time - traveler from modern times who has read 'Pride and Prejudice' extensively. She arrives in Austen's world and tries to use her knowledge of the book to her advantage, but ends up changing the story in unexpected ways. For example, she might accidentally introduce modern concepts like feminism to the female characters, which then causes a stir among the society in the story.
Well, an interesting plot for an Atlantis the Lost Empire OC fanfiction could be an OC with a special connection to the Atlantean crystals. Maybe the OC discovers that they can communicate with the crystals in a way no one else can. This could lead to uncovering secrets about Atlantis' past and future. Or perhaps an OC who is an outcast in their own world and finds acceptance in Atlantis. They could bring new ideas and skills to the Atlantean society, like a new form of art or music. Also, an OC could be a time - traveler who ends up in Atlantis. Their knowledge of the future could either help or endanger Atlantis, depending on their actions.
An OC could be a stowaway on the ship in the 'lost in space' universe. This stowaway has a mysterious past and special skills, like being able to communicate with an alien species that the main crew doesn't know about. Their presence could cause both chaos and new opportunities for the crew as they try to find their way home.
Develop the OC's backstory. If they're from a different part of the world, explore how that culture influenced them. Say the OC is from a small fishing village in Japan. Their skills in fishing and knowledge of the sea could be useful on the island and also shape their character in terms of being resourceful and patient.
One idea could be that Sawyer and Ash team up for a special Pokemon tournament. They start off as rivals but gradually learn to respect and support each other. Another could be that they go on an adventure to discover a new and rare Pokemon species in a far - off region. Sawyer might initially be skeptical of Ash's methods but in the end, they both benefit from the experience.
One idea could be that the reader is a new student in Tom Sawyer's school. Tom, being the mischievous boy he is, decides to play pranks on the reader at first but then gradually falls in love as he gets to know the reader's kind heart. For example, he might put a frog in the reader's desk, but later feels bad when he sees the reader's scared face and tries to make it up by sharing his secret fishing spots.
Another plot could revolve around an OC who is a Spartan trainee that doesn't quite fit the mold. They have a different way of thinking and approaching combat. In Halo 4, they end up being the key to solving a mystery related to the Prometheans. Maybe they find a way to communicate with the Prometheans and convince some of them to stop fighting the humans.
One idea could be an Otsutsuki OC who comes to Earth not for conquest but to study the unique life forms here. They could befriend some of the local ninjas and learn about the concept of friendship, which is alien to the Otsutsuki. This would lead to a series of adventures where they have to protect their new friends from other more hostile Otsutsuki members.
One idea could be an OC who is a long - lost relative of Moana. This OC could have been separated from the family during a great storm years ago. They could have unique skills, like being able to communicate with a different type of sea creature that Moana has never encountered. This would bring new adventures as Moana and the OC try to figure out how this new discovery could help their island.
One idea could be exploring the origin of the OC in the covenant world. Maybe they have a special power that sets them apart from the regular covenant members.