I really like 'Obito's New Path'. In this fanfiction, Obito gets a second chance in a different reality. His Sharingan abilities are explored in unique ways, like how he uses it to understand the true nature of the ninja world. The story also has great character development for Obito and other Naruto characters.
One common theme is redemption. Since Obito has done a lot of bad things in the Naruto series, many fanfics focus on him trying to make up for his mistakes. Another theme is love, whether it's his love for Rin that drives his actions or new relationships he forms.
A different fanfiction could involve a magical experiment gone wrong that transports Harry Potter to the Naruto world where he meets Obito. Harry, with his knowledge of magic, and Obito, with his ninja skills, have to find a way back to their respective worlds. Along the way, they learn from each other's cultures and abilities. Harry could teach Obito about some basic spells, and Obito could show Harry some ninja techniques like how to move stealthily or use a kunai effectively.
One great Obito Uchiha time travel fanfiction is 'A New Chance for Obito'. In this story, Obito travels back in time and tries to prevent the tragedies that befell the Uchiha clan. It's really engaging as it shows his internal struggle to change things while not disrupting the entire timeline too much.
There's also 'Obito's Unlikely Bond'. In this fanfic, the OC is a healer who stumbles upon a wounded Obito. Their relationship starts off rocky but gradually turns into something deeper. The story does a wonderful job of exploring Obito's complex emotions and how the OC helps him come to terms with his past. It's a really heartwarming read.
Yes, there might be. There are many creative fanfiction writers in the world who like to combine different fictional universes. Some might have come up with the idea of integrating Harry Potter and Obito Uchiha. You can try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own to see if there are any such stories.
There's also 'Sharingan - Naruto's New Power'. In this fanfic, Naruto gets Obito's Sharingan in a rather unexpected way. The story focuses on his journey to master this new power. It has some interesting plot twists, such as Naruto having to face off against enemies who are specifically targeting him because of his newfound Sharingan ability.
In many 'naruto has obito sharingan' fanfics, a unique aspect is the new combat potential. Naruto already has his own powerful techniques, and adding the Sharingan gives him an edge in battle, like enhanced perception and the ability to copy enemy jutsu more effectively.
Power is a common theme. Since the Sharingan gives its wielder special abilities, many fanfics explore how characters gain, control, and use that power. Another theme is redemption. Given the Uchiha clan's history in Naruto, some fanfics focus on characters redeeming themselves or their clan through the use of the Sharingan.
In a fanfiction, an OC Uchiha born with an activated Sharingan could face unique challenges. The Sharingan drains chakra, and being born with it activated might mean they have to learn early on how to manage their chakra levels more effectively. Also, they could attract unwanted attention, either from jealous clan members or from enemies who see them as a threat due to their special ability.