The OC's character can be developed through her reactions to different situations. When she first meets Sasuke, how does she respond to his coldness? Does she try to break through his barriers or is she put off? With Gaara, when she learns about his past, does she pity him or see his strength? Also, give her a moral code. If she believes in always helping the weak, it will affect how she treats Sasuke when he's in a dark place and how she interacts with Gaara's people in the Sand Village. Her hobbies and interests can also be used to make her more three - dimensional. For example, if she loves cooking, she could cook for Sasuke and Gaara, and through that, their relationships can grow and develop.
One great OC could be a female ninja named Aya. She is strong - willed, has amazing combat skills, and is not afraid to stand up to Sasuke. Her determination and loyalty make her an interesting character in the fanfiction. Another could be Kai, a male OC who has a unique ability to control the elements in a different way than the known ninja in the Naruto universe. His different perspective and skills make him stand out when paired with Sasuke.
One popular plotline is the OC being a new student in Sasuke's school or workplace. This sets up a situation where they gradually get to know each other. Another is that the OC has some special ability or knowledge that Sasuke needs, which brings them together. For example, the OC might be a hacker and can help Sasuke with some secret mission in the modern world.
I really like 'Sasuke's New Ally', where the male OC brings out a different side of Sasuke. The fanfic is interesting because it shows how their relationship develops in the context of the Naruto universe, with both facing various challenges together.
The relationship might develop through shared experiences. As the OC goes through the different stages of pregnancy, they face various challenges together. Maybe they have to deal with a difficult pregnancy and Sasuke has to be there for her, which strengthens their bond. Also, they could start planning for the future of their child, which brings them closer.
In sasuke x oc modern fanfiction, character development can be really interesting. The OC (original character) often has to grow and adapt in a world where Sasuke exists. The OC might start as an ordinary person and gradually become stronger, both physically and mentally, due to their interactions with Sasuke. For example, they could learn from Sasuke's determination and skills, which in turn shapes their own personality. Their relationship also plays a crucial role in this development. As they get closer to Sasuke, they might face challenges that force them to change and mature.
There's also 'Sasuke's Unlikely Companion'. In this fanfiction, the OC slave has a unique backstory that draws Sasuke in. The story is filled with action and emotional moments as they face various challenges together. The development of their relationship is gradual, starting from a place of distrust due to the slave - master situation and slowly turning into a deep bond.
A good Sasuke x Male OC fanfiction should have a well - developed OC. The character needs to be unique and have his own backstory that can blend well with Sasuke's story. For example, if the OC has a special power, it should be integrated into the plot in a way that makes sense.
One plot idea could be that the OC is a powerful ninja from a hidden village. She meets Sasuke first during a mission where they initially clash due to Sasuke's brooding nature and her more optimistic outlook. Later, she also encounters Gaara. Gaara is intrigued by her because she doesn't fear him like others. The OC then finds herself in a love triangle, with Sasuke being drawn to her because she challenges him, and Gaara seeing in her a chance for a different kind of connection. As the story progresses, she has to choose between them while also dealing with the political unrest in the ninja world that affects all three of them.
Some fanfics have the OC being from a different clan that has a long - standing feud with the Uchiha. But Sasuke and the OC break the cycle of hatred. They have to overcome the objections of their respective clans while trying to understand their feelings for each other. It's a story of love defying old grudges.