Well, Cid Kagenou does reveal himself at a crucial point in the manga. This reveal has significant implications for the plot and character development.
One great 'Tobi Obito x OC Fanfiction' is 'The Hidden Bond'. It has a really interesting plot where the OC has a unique connection with Obito that gradually unfolds throughout the story. The character development is well - done, especially for the OC as she starts off as a shy girl but grows into a strong kunoichi through her experiences with Obito.
One common theme is redemption. Since Obito has a dark past in the Naruto series, in many fanfictions, the OC helps him find a path to redemption. Another theme is love against all odds. Their relationship often has to overcome obstacles like Obito's loyalty to his original goals or differences in their villages.
In fanfiction, Naruto sacrificing himself for Obito could be a very emotional and dramatic concept. It might show Naruto's ultimate selflessness, believing that Obito is worth saving at the cost of his own life. This could be due to Naruto seeing the good in Obito that others might not, like the part of Obito that was once a kind - hearted shinobi.
The story would take a very dark turn. Naruto is a central figure, and his loss would be deeply felt. Obito might feel an overwhelming sense of guilt. He could potentially turn his life around completely to honor Naruto's sacrifice, perhaps becoming a force for good in a way he hadn't been before.
Naruto might become more reserved. Since Obito has a more brooding personality, Naruto could pick up on some of that. His once - bright and exuberant nature might be tempered.
I recommend the "United Heart Case" and "Black and White Case Files."
"The United Heart Case" unfolded with the case as the main line. The male and female leads met to investigate the case and worked together to solve the case. Although it was not explicitly stated that the detective himself was the murderer, as the case developed, the readers would discover that the male protagonist had unusual actions and thoughts, which would arouse the readers 'suspicion and reasoning.
Black and White Files was a detective team formed by the fallen special forces, Daybreak and Spade K. They uncovered the conspiracy behind a mysterious ability organization. Spade K tested the special forces soldier, making the readers doubt his identity and causing them to speculate. The novel also had many amazing twists and turns that could surprise the readers.
I hope you like this fairy's recommendation. Muah ~😗