A really cool plot could be that the Death Reaper is actually a misunderstood entity. Naruto discovers that it's not there to simply take lives, but to balance the forces in the ninja universe. So Naruto teams up with the Reaper to stop some greater evil that is disrupting the natural cycle of life and death.
Perhaps a plot where Naruto makes a deal with the Death Reaper to save his friends. He has to go on a dangerous quest in the afterlife or something like that. It could involve facing his own fears and the dark secrets of the ninja world.
One interesting plotline could be a character with the Reaper Bloodline having to hide their power from the main Naruto characters at first. Maybe they're afraid of being hunted or experimented on because of their unique bloodline.
One interesting plotline could be Naruto having to team up with unexpected allies in the death race. Maybe he has to work with former enemies to survive the dangerous challenges of the race.
One possible plotline could be how the characters in Naruto deal with the sudden outbreak of a Black Death - like disease. Maybe Naruto himself tries to find a cure using his shadow clones to search far and wide.
A 'naruto reaper of death fanfiction' likely weaves together the Naruto franchise with the idea of a reaper of death. It could be a dark and edgy take on the Naruto story. Naruto might be given the role of a reaper, either by some sort of curse or a new power bestowed upon him. This could lead to him having to make tough choices about who lives and who dies, which would be a huge departure from his normal character. His relationships with his friends and the ninja community would also be affected as they may not understand his new role or may be afraid of the power he now wields.
One interesting plotline could be the exploration of new jutsus related to the Death God. Maybe the protagonist discovers a long - lost technique that the Death God once used. Another could be the interaction between Naruto and the spirit of the Death God, leading to some unforeseen consequences for the ninja world.
Well, in 'naruto reaper fanfiction', a cool concept might be the idea of Naruto or other characters having to face reaper - like entities as antagonists. It could bring a whole new level of danger and mystery to the story. These reaper entities could have unique powers and motives that are different from the regular Naruto villains.
Another plot idea is to have a character who is not Naruto, perhaps a new OC (original character), inherit the knowledge of the Reaper Death Seal in an unexpected way. This character could then face the moral dilemma of using such a powerful and dangerous jutsu.
One interesting plotline could be Harry's adventures in the afterlife realm where he has to deal with different types of souls. Maybe he meets some souls with unfinished business and tries to help them move on.
Power and sacrifice are common themes. The death seal is a very powerful jutsu that often requires sacrifice, so many fanfictions explore this aspect. For example, a character might have to sacrifice their own life or something precious to use the seal effectively.
One possible plotline could be that Harry gains unique powers or abilities from being raised by Death. For example, he might have an enhanced understanding of life and death magic, which gives him an edge in battles against dark wizards. Another plotline could involve his relationship with other characters being drastically different. Since he's raised by Death, he might be more isolated from his peers at Hogwarts, leading to a complex web of friendships and rivalries.