There probably is. Fanfic writers love to experiment with different concepts. In a Naruto is a Ghost fanfic, the writer could play with ideas such as Naruto's ghost having special powers that he didn't have when he was alive. Maybe he can pass through walls and spy on the Akatsuki or something. You can start your search for such a fanfic on platforms like Fanfiction.net or Archive of Our Own.
A really engaging 'Ghost Naruto Fanfiction' is 'Naruto: The Ghostly Avenger'. Here, Naruto is killed unjustly and returns as a ghost. He then embarks on a journey to seek revenge and also to protect his village in a different way. The author does a great job of portraying Naruto's emotions as a ghost, from his anger at being wronged to his love for his friends and village.
Well, in 'Ghost Naruto Fanfiction', we get to see Naruto in a completely different light. For example, he could have powers like passing through walls or being invisible. This changes the way he interacts with his friends, enemies, and the world around him. Also, the themes of life, death, and the afterlife can be explored more deeply compared to the original Naruto series. The fanfiction can make us think about what it means for Naruto to be a ghost and how he copes with this new existence.
Well, it could be about many things. It might be a story where Naruto has some sort of ghost - like encounter in Konoha. Maybe he meets the ghosts of past shinobi or there could be a mystery involving a spectral presence in the village that only Naruto can solve.
One possible plot could be Naruto dying heroically in a battle and coming back as a ghost to guide his friends. For example, he could help Sasuke understand the true meaning of friendship from beyond the grave.
Well, one way could be Naruto having the Ghost Rider's chain weapon. He could use it in his combat style, like when he's facing tough enemies. Maybe the chain could be enhanced with his chakra, giving it new abilities.
In this fanfiction, Naruto would grow in terms of his understanding of the world. Since he's half - ghost, he'd be exposed to different realms and beings. This would make him more adaptable and open - minded. His relationships with his friends would also change. He'd have to explain his new self to them, and in doing so, he might become more patient and understanding. For example, Sasuke might initially be skeptical but Naruto would have to find a way to make him see the potential of his half - ghost abilities.
To develop Hashirama's ghost, we could give him a sense of purpose. He could be a protector of the village in the afterlife. So, when he senses a great danger approaching the village, he decides to reach out to Naruto. He could have a deep connection to the natural world even as a ghost, and his powers could be related to manipulating nature spirits. He could teach Naruto how to communicate with these spirits and gain their assistance in times of need.
Naruto himself is often a popular character in these fanfictions. The SI Ghost might interact with him in various ways, like helping him with his training or providing him with new insights.
In a 'naruto is half ghost' fanfiction, the plot might center around Naruto's struggle with his dual nature. He could be shunned by some in the village who fear his ghostly side. Meanwhile, he has to learn to control his new powers. For example, he might discover he can travel to a spirit realm and has to figure out how to use that to his advantage, like getting intel on enemies or finding lost jutsu.