Well, he might gain some super abilities. For example, he could potentially see the souls of enemies, which would give him an edge in battle. He could also use the Shinigami eyes to detect hidden traps or illusions that are based on spiritual energy.
His relationship with Sasuke might change. Sasuke might be more intrigued or even a bit jealous of Naruto's new power. Naruto could use the Shinigami eyes to better understand Sasuke's inner turmoil, which is often related to his own spiritual and emotional state.
The 'naruto is the shinigami fanfiction' might be about a new adventure for Naruto. Since Shinigami are often associated with death and the supernatural, it could mean Naruto gets involved in a situation where he has to interact with Shinigami - like beings. This could change his character development, as he has to deal with new moral and ethical dilemmas related to the power and nature of Shinigami. For example, if Naruto has to decide whether to use Shinigami - like powers for the greater good or not, it can lead to a very interesting story arc.
Well, it could be in a crossover fanfiction where the Naruto universe combines with a supernatural world that features Shinigami. Maybe it's a story where Naruto gains Shinigami powers through some unique event or training.
Well, in some fanfictions, the Shinigami might save Naruto by using its special powers to reverse a fatal curse or injury. For example, it could extract a harmful entity that was about to kill Naruto from his body.
Maybe the Shinigami uses its special powers to heal Naruto's severe injuries. For example, it could transfer some of its own spiritual energy to Naruto to revive his fading life force.
Well, it could be about many things. It might be a story where Naruto receives some sort of special gift from a Shinigami. Maybe it's a power, a weapon, or some kind of knowledge. Without reading it, it's hard to say exactly.
I'm not sure specifically as there could be many different plots in such a fanfiction. Generally, it might involve the Naruto character who is a Jinchuuriki (a host of a tailed beast) having some sort of connection or interaction with the Shinigami (the god of death in some contexts). It could be about how his Jinchuuriki powers are affected by this connection, or perhaps adventures that come from it.
It's mainly about the story related to Shinigami. Usually, it might involve their existence, their tasks, and their interactions in a fictional world. But without reading it thoroughly, it's hard to give a very detailed account.
Well, in this 'naruto champion of the shinigami fanfiction', it could be that Naruto is chosen by the Shinigami for a special mission. The Shinigami might see something unique in Naruto, like his strong will or his ability to never give up. So, Naruto is made the champion. As the champion, he could be tasked with maintaining the balance between the living and the dead in the Naruto world. This would likely involve battles against those who try to disrupt this balance, such as evil spirits or necromancers. He may also have to face his own inner demons and learn how to control the power of the Shinigami without being consumed by it.