Maybe an OC that is a human who has a special bond with an android. They could work together to expose a secret conspiracy within CyberLife. This would add a new layer of complexity to the existing storylines in Detroit: Become Human.
One idea could be an OC who is a prototype android with unique abilities that neither CyberLife nor the deviants are aware of. This OC could be caught in the middle of the conflict between humans and androids, trying to find its own place in the world.
An interesting OC fanfic could focus on an android OC who was created specifically to study the deviant phenomenon. This OC starts to experience deviant thoughts itself and has to decide whether to follow its newfound emotions or continue with its original programming.
You could focus on the relationship between Connor and Hank in a fanfiction. Imagine if Connor had a different origin, like he was created by a group of rogue scientists who wanted him to be more human - like from the start. This could lead to a whole new dynamic between him and Hank, as they would have different interactions and goals. Also, you could write about how the androids develop new emotions and abilities that were not shown in the original game.
A more emotional plot could be about a Traci trying to find her 'sister' Traci. She could go on a long journey across Detroit, encountering different characters along the way. Some might help her, while others might try to use her for their own gain. This would be a story full of suspense, hope and despair.
One idea could be a story where an android character, like Kara, discovers she has the ability to become pregnant in a world where androids are evolving. This could lead to a journey of self - discovery as she tries to understand what it means for an android to carry a new life. It could also explore how society views this phenomenon, whether with fear, curiosity or acceptance.
One great 'Detroit: Become Human' OC fanfiction is 'The Android's New Path'. It focuses on an original character who is an android trying to find its place in a world that is still divided on android rights. The story has great character development and really delves into the moral and ethical themes of the game.
An interesting approach would be to make an android OC that has a malfunction that gives them unexpected emotions or abilities. Maybe they experience a form of 'glitch - love' for another character. This could create a lot of internal conflict as they try to understand what they're feeling while also dealing with the outside world's reaction to them. It could also lead to a love triangle type of situation if there are other characters involved.
One plot idea could be that chubby Connor is discriminated against in the android world due to his appearance. But he uses this to his advantage, showing more humanity than the 'perfect' androids. For example, he befriends a human who initially judges him but then realizes his worth.
One interesting plot idea could be a story where an android, who is not part of the main cast, discovers a hidden part of Detroit that holds the key to a past event that could change the relationship between humans and androids. This android could then face the dilemma of whether to reveal this discovery or keep it a secret for its own safety.
One idea could be inserting yourself as a new android model created by CyberLife. You could have unique abilities that set you apart from the existing androids like Connor, Kara, and Markus. For example, you might have the ability to instantly analyze and predict human behavior more accurately than Connor. Another plot could involve you being inserted into the story during the android revolution. You could either side with the androids and use your 'human' knowledge to help them in ways they hadn't thought of, or you could try to find a middle ground between the humans and androids to end the conflict peacefully.
The theme of survival is also prevalent. In a world where androids are facing discrimination and sometimes violence, OC characters have to find ways to survive. This could mean an OC android hiding its deviant status or an OC human trying to protect their android friends from harm. It adds a sense of urgency and drama to the stories.
A great Kara Detroit: Become Human fanfiction could be set in an alternate universe where Kara is a detective - like android. She uses her unique skills and empathetic nature to solve crimes that involve both humans and androids, and in the process, she challenges the existing prejudices between the two groups.