One common theme is identity. Since the OC is original, a lot of fanfiction explores how they figure out who they are in the context of the Nurarihyon world, whether they're part human, part yokai, or something else entirely.
Friendship and alliances are a big theme as well. Since it's a crossover, fanfics usually show how characters from Naruto and Nurarihyon can form friendships or alliances despite their initial differences. They might work together to face a common enemy, like a powerful dark force that threatens both their worlds.
A common theme is the exploration of their relationship, whether it's a budding friendship or something more. Another theme is the clash of their different worlds and how they overcome the differences.
I'm not entirely sure as I haven't read that specific fanfiction. But generally, it might be about Naruto having some sort of connection to Nurarihyon, perhaps in an alternate universe where Naruto is considered Nurarihyon's son. It could involve Naruto having new powers or a different backstory related to Nurarihyon's world.
The 'nurarihyon no mago light novel' is mainly about a young boy named Rikuo Nura. He is a part - human, part - yokai (demon - like being) and is set to inherit the position of Nurarihyon, the supreme commander of the yokai. The story follows his journey as he tries to balance his human life at school and his yokai responsibilities, dealing with various yokai clans and their politics, and also facing threats from both the yokai and human worlds.
Yes, it's definitely worth reading. It has a really interesting story with unique characters. The world - building in the 'nurarihyon no mago' light novel is quite fascinating, full of Japanese mythology elements that draw you in.
One possible plotline could be Naruto somehow ending up in the Nurarihyon world and having to learn the rules and powers there. Maybe he teams up with some of the Nurarihyon characters to face a common enemy.
In a Nurarihyon Naruto fanfic, a really cool concept could be the cross - over of abilities. Like, if Sasuke were to gain some yokai - like abilities such as shape - shifting or some form of illusion that's unique to the yokai world. It could also explore how the Naruto characters would adapt to the more otherworldly and mysterious nature of the Nurarihyon world, which is full of strange creatures and unorthodox powers.
The main character is Rikuo Nura. His grandfather Nurarihyon is also very important. Then there's Tsurara Oikawa, a yokai who is often by Rikuo's side.