One common theme is power acquisition. Just like in the original Naruto series where he gains new powers, in fanfics related to mythology, Naruto often obtains powers from mythological beings. For example, he might get the strength of Thor in a Norse - mythology - inspired fanfic.
One interesting concept could be exploring different interpretations of the ninja clans' origins. For example, delving deeper into the Uchiha clan's connection to the Sharingan's true power source. Another could be creating new jutsu based on the existing Naruto mythology. And some fanfics might focus on alternative storylines for characters like Naruto, such as if he had been raised differently in the Hidden Leaf Village.
A great option could be Orochimaru fused with Hades. Orochimaru's thirst for power and immortality combined with Hades' control over the Underworld would make a terrifying villain. He could be plotting to take over both the ninja world and the realm of Greek gods. He might use his dark jutsu and Hades' power over death to create an army of undead ninjas and mythological creatures.
One way is to combine Naruto's unique ninja abilities with Greek mythology elements. For example, Naruto could have a power similar to Zeus's lightning bolt. He might be on a quest to retrieve a powerful artifact from Greek mythology, like the Golden Fleece, and use his ninja skills to overcome the challenges along the way. You can also introduce Naruto characters into Greek mythological settings, such as having Sasuke in the Underworld facing off against Hades.
First, you need to have a deep understanding of the Naruto mythology. Know the characters, their abilities, and the world they live in. Then, come up with a unique idea. It could be a new adventure for the main characters or a different take on an existing event. Also, focus on character development. Make the characters grow and change in believable ways. For example, if you're writing about Naruto, show how he overcomes new challenges and becomes stronger not just physically but also mentally.
There's also 'Naruto in the Realm of Myth'. In this fanfic, Naruto is transported to a world filled with mythological creatures. He has to navigate through this new world using his ninja skills and knowledge, and it's really interesting to see how he interacts with these myth - based elements.
Power is a common theme. Many fanfictions explore how characters gain new powers related to Naruto mythology. Another theme is heritage, like exploring the lineage of characters in relation to the ancient mythology.
Greek mythology can introduce new types of magic. For instance, the magic associated with the Greek gods like Aphrodite's love - inducing magic could be incorporated into a fanfic's plot. It might create a love triangle or some other relationship - based plotline in the Harry Potter setting. Another influence could be in the form of quests. Just as Greek heroes had to go on quests, characters in the fanfic could embark on a similar journey, perhaps to find a lost Greek magical artifact hidden in Hogwarts or the wizarding world.
Transformation is another theme. Greek mythology is full of characters being transformed, like Daphne turning into a laurel tree. Fanfics can play with this concept, perhaps creating new stories of transformation or exploring the psychological impact of such changes on the characters. And power struggles, not just among the gods but also between mortals and gods, are a common theme as well. This can lead to interesting stories of resistance and the quest for equality in a world dominated by the all - powerful gods.
Another idea is a crossover where the concept of chakra in Naruto is related to the power of the Greek gods. The Shinigami could be like the ferrymen of the Greek underworld, but also have a connection to the ninja world. Maybe Naruto is sent on a mission to this strange new world by the Hokage, and he has to team up with a Greek hero to defeat a common enemy that threatens both worlds.