One possible fanfiction idea could be that Hinata discovers Naruto has a half - demon side that he's been hiding. This could lead to a lot of interesting character development. Hinata, being the understanding person she is, might help Naruto come to terms with this part of himself. It could also introduce new powers and abilities for Naruto, and perhaps a new level of relationship between the two.
One common theme is the struggle with identity. Since Naruto has half - demon blood, he has to figure out who he really is, whether he's more human or more demon. Another theme is power. The half - demon aspect usually gives him some unique powers, and he has to learn to control them.
It could be a powerful ninja from another village who is jealous of Naruto's half - demon half - god powers. He might see Naruto as a threat to his own village's dominance and try to eliminate him.
It could be because of the way Naruto's power sometimes goes out of control. When the Nine - Tails' chakra leaks out, it can be quite intimidating. Sakura, not knowing how to handle it or being scared of it, might lash out and call Naruto a demon. Also, in the early days, Naruto was often ostracized, and Sakura may have been influenced by the general perception of Naruto as something 'other' or dangerous.
Maybe there's an ancient prophecy in the 'naruto half demon half god fanfiction' world that Naruto is the key to saving the world because of his half - demon half - god heritage. But he first has to unlock all of his powers. This would lead to a journey of self - discovery, where he meets different characters who help or hinder his progress. Along the way, he could also learn about the origin of his unique nature and how it came to be.
One popular 'half - demon Naruto fanfiction' could be 'Naruto: The Half - Demon's Path'. It often explores Naruto having some sort of demonic heritage and how that changes his journey in the ninja world. He might have new powers or face different challenges compared to the original story.
A common villain could be Orochimaru. Since he was always interested in powerful jutsus and abilities, he might target Sakura to use her as a pawn in his experiments. And Naruto, with his demon powers, would have to stop him. Orochimaru is a well - known and menacing character, so it makes sense for him to be a villain in these fanfictions.
Another plot might involve Naruto's demon side being awakened in a different way than in the original story. He discovers that his demon powers are the key to saving Sakura from a curse that was placed on her. So, he has to learn to control and use these new - found powers to break the curse and free her.
It might also cause Naruto to lose control more easily. If he hears such a hurtful term from someone he cares about like Sakura, it could make him more vulnerable to the Nine - Tails' influence. In the long run, it could be a turning point in his character development, either making him more bitter or more determined to show everyone, including Sakura, that he's not what she says.
One interesting plot point is that the village elders are against Naruto and Hinata's relationship because of Naruto's half - demon nature. They fear that it will bring danger to the village. However, Naruto and Hinata are determined to stay together and prove that their love can overcome any prejudice. Also, Naruto's half - demon form could attract the attention of other powerful forces outside the village, either as a threat or as a potential ally, and they have to navigate these situations.