Perhaps a plot where the power system of Naruto is combined with the concepts in Throne of Heroes. For example, Naruto characters could gain new abilities based on the Servant classes in Throne of Heroes. Sakura could become a Caster - type Servant with enhanced medical ninjutsu and new magical abilities. And the story could revolve around how these characters adapt to their new powers and roles within the Throne of Heroes world.
Well, you could have a plot where the villains from Naruto, like Orochimaru, manage to infiltrate the Throne of Heroes system. They start to corrupt the heroic spirits there. And Naruto, along with his friends, have to travel to this new realm to stop Orochimaru and his evil plans. This would bring a whole new level of conflict and adventure as they deal with both the unknown rules of the Throne of Heroes and their old nemesis in a new setting.
One idea could be a crossover where Naruto characters are summoned into the Throne of Heroes universe and have to compete in the Grail War. Another could be a story where Naruto himself becomes a heroic spirit in the Throne of Heroes and uses his ninja skills in a new and strange world.
One idea could be a new prophecy that involves the demigods having to travel to an unknown realm to retrieve a powerful artifact before the Titans use it to destroy the world. Another could be a fanfic where the demigods form an alliance with some previously thought - of - as - enemies, like certain monsters who also don't want total chaos. Or perhaps a story where a demigod discovers a hidden power within themselves that has the potential to change the balance of power between the gods and the Titans.
Perhaps a story where the characters from Naruto are summoned to the Throne of Heroes realm and have to participate in some sort of grand tournament. This could lead to unique battles and character developments as they interact with heroes from other universes.
One idea could be exploring an alternate universe where Naruto's parents didn't die. This would change his whole upbringing and how he views the world. He might not be as driven to become Hokage in the same way, and his relationships with characters like Iruka and Sasuke could be very different.
One idea could be a time - traveling adventure where the heroes from different eras of Dragon Ball come together to face a new, powerful enemy in the Heroes universe. For example, Goku from the Saiyan Saga teams up with Goku Ultra Instinct from a later time.
An interesting plot idea for Naruto fanfic might be to focus on the life of a minor character. For instance, what if we told the story of a genin who never made it to be a chunin but still had a significant impact on the village in some other way? Or a story where all the ninja abilities are suddenly switched among the characters, and they have to adapt to these new powers while still facing their usual enemies. This could lead to some really fun and unexpected character interactions.
One interesting plot could be the heroes from different Hogwarts houses uniting against a new dark wizard threat that is more powerful than Voldemort. They might have to combine their unique magical skills and knowledge.
One idea could be to have heroes from different universes team up to fight a common, powerful enemy. For example, Superman from DC and Thor from Marvel joining forces.
A great plot might involve the traitor's family. How do they react to the accusations? Do they believe in the traitor's innocence? For example, a sister could embark on a journey to find evidence to prove her sibling's loyalty. This would add a lot of emotional depth to the fanfiction.
One idea could be exploring a side character's backstory. For example, a minor character in 'a throne of stars' might have a really interesting past that wasn't fully explored in the original. Maybe they were part of a secret organization before and their actions now are influenced by that past. Another plot idea could be a 'what if' scenario. What if the main character made a different choice at a crucial moment? It could lead to a completely different story arc and interactions with other characters.
One idea could be exploring the backstories of the minor characters in 'throne of babylon'. Maybe a character who was a servant in the palace has a secret past as a spy from another kingdom. Another could be a love story between a noble and a commoner set against the backdrop of the political intrigue in Babylon.