Perhaps in this fanfic, the 'death god' has a role in the chakra system. It could be that the 'death god' has some connection to the origin of chakra, and Naruto, being the main character, has to discover this connection. This could lead to Naruto having to master a new form of chakra control or power that is related to the 'death god', which would be a very interesting twist on the traditional Naruto story.
One interesting concept could be the different ways the Death God is portrayed. Maybe it has unique powers or a backstory that's different from the original Naruto lore.
One interesting concept could be Naruto's newfound god - like powers. Maybe he can control elements in ways far beyond what was shown in the original series, like creating entire landscapes with a thought.
One interesting concept could be the combination of Naruto's unique ninja abilities with the powers of a god. For example, Naruto might gain the ability to control time like some deities, which would completely change the dynamics of his battles and how he interacts with the Naruto universe.
Well, one interesting concept could be the re - imagining of Naruto's power levels. Maybe in this fanfic, Naruto attains a new form of power that is god - like, which completely changes the power dynamics in the Naruto universe. It could also introduce new characters that are related to this 'mortal god' idea, like perhaps a group that worships Naruto as such and has their own motives and storylines.
One interesting concept could be the origin of the God Tree. In some fanfics, it might be tied to an ancient civilization's experiment gone wrong. Another could be the unique powers it bestows on characters. For example, a character might gain the ability to control all forms of nature energy due to a connection with the God Tree. Also, the relationship between the God Tree and the tailed beasts can be explored in different ways, like the God Tree being a prison for the tailed beasts' true power in some interpretations.
One interesting concept could be the fusion of the Naruto and High School DxD universes. For example, seeing how Naruto's ninja skills would interact with the devil - based powers in DxD. Maybe Naruto characters using their chakra in the DxD world to fight against devils or angels in new and unexpected ways.
In 'naruto elemental god fanfic', perhaps the concept of how the elemental god interacts with the existing Naruto world is really cool. It could be that the god has to hide its true identity while still influencing the major events in the story, adding a layer of mystery.
In 'naruto tower of god fanfic', an interesting concept might be the interaction between the different powers. For example, Naruto's chakra and the Shinsu from Tower of God. How would they co - exist or clash? It could lead to really unique battle scenes and power - up moments for the characters.
Well, perhaps the fanfic explores how the ninja system in Naruto would interact with the tournament - based power structure in 'The God of High School'. It could lead to some intense battles where ninjutsu meets superhuman combat skills. Also, the different values of the two worlds, like the importance of friendship in Naruto and the pursuit of strength in 'The God of High School', might clash or merge in interesting ways.
One interesting concept could be the combination of Naruto's world with god - slayer magic. It might introduce new power dynamics and character developments. For example, Naruto characters could gain the ability to slay gods, which would completely change the power scale in the Naruto universe.