Since I'm not familiar with this particular 'harbinger of death novel', I can't tell you who the author is. It could be an indie author or someone from a small press. You might want to check on specialized book review sites or ask in book - related forums to find out more about the author.
I'm not sure specifically as there could be many novels with this title or concept. It might be about a character or entity that is seen as a sign or precursor of death. Maybe it involves a dark and mysterious plot where the 'harbinger of death' is on a mission or is part of a prophecy.
The plot could involve Naruto being a harbinger of death in a way that he has premonitions of upcoming disasters in the ninja world. For example, he might start seeing visions of villages being destroyed and then tries to prevent these tragedies from happening, while also facing skepticism from others who don't believe in his new - found power.
It could be a powerful rogue ninja who wants to use Naruto's new - found 'harbinger of death' status for his own evil purposes. Maybe he believes that Naruto can lead him to powerful and dark artifacts that are only revealed during times of death and destruction.
Well, to determine if the Harbinger is fiction, we need to know more about it. Maybe it's a story with imaginative elements, in which case it would be fiction. Or it could be based on real events with some embellishments, making it a blend of fact and fiction.
Well, 'harbinger graphic novel' could be about a group of individuals who are harbingers of some sort. It could be that they are the first to discover a new world, a new power source, or they might be warning signs for impending doom in their fictional universe. The graphic novel would then tell their story through pictures and words, exploring their relationships, their struggles, and their triumphs.
I'm not sure exactly as I haven't read the book. But usually in a novel, there is a protagonist. It could be someone who has a special mission or is at the center of the events in 'the harbinger novel'.
Perhaps it also has a theme of self - discovery. The characters in the novel may go through a journey where they learn more about themselves. For example, they could face challenges that force them to confront their fears and insecurities, leading to self - growth.