A great read is 'Naruto: United by Power'. The OC in this fanfic has a special ability that complements Naruto's. They form a strong bond and fight against common enemies, and the story does a great job of showing their relationship evolve over time.
One idea could be an OC who is a foreign ninja from a far - off land coming to Konoha. Their unique fighting style and culture shock could create interesting storylines. For example, they might introduce new jutsu techniques that the Konoha ninjas have never seen before.
One common theme is self - discovery. The OC often has to figure out their place in the Naruto world while being in a harem, which helps them grow as a character.
One common theme is the exploration of a new kind of relationship. Since it's yaoi, it often involves a male - male relationship between Naruto and the OC. Another theme is the adaptation of the Naruto world to fit this new relationship. For example, how the ninja society in Naruto reacts to their relationship.
One thing that makes a strong Naruto x OC fanfic interesting is the exploration of different themes. It could be about love, friendship, or sacrifice. When the story delves deep into these themes with Naruto and the OC as the main focus, it becomes engaging. Also, the action scenes are important. If the OC is strong, their battles with Naruto against foes should be exciting and well - choreographed. It gives readers a sense of the power dynamics between the two characters and how they work together in combat.
One common theme is self - discovery. Both the female Naruto and the OC often go through a journey of understanding themselves better. Another theme is friendship. They build a strong bond that may develop into something more. Also, the theme of overcoming challenges is prevalent as they face various obstacles in the Naruto - like world.
There's also 'A New Bond in Konoha'. This fanfic focuses on how the male OC, who has a unique chakra ability, meets Ino. The story delves deep into how their different personalities complement each other. It's a long - form fanfic that really takes its time to build up their relationship, starting from initial distrust to a deep and meaningful connection.
One popular 'Naruto oc x harem fanfic' is 'The OC's Adventure in Naruto's Harem'. It has an interesting plot where the original character gets involved with multiple characters from the Naruto universe in a unique way.
Often, there's the theme of power and self - discovery. The fem Uchiha OC discovers her own powers and identity, and Naruto is there to support her. Also, the theme of family and clan loyalty is prevalent. The OC has to balance her feelings for Naruto with her loyalty to the Uchiha clan. This creates a lot of internal and external conflicts in the fanfic.
There's also 'Love in the Hidden Leaf'. In this fanfic, the OC has unique abilities and meets an Uchiha during a mission. The relationship development between them is really interesting, and it also shows a different side of the Naruto universe. It's well - written with great character descriptions.