I'm not sure specifically as I haven't read it. But generally, a graphic novel like 'Harbingers' might be about a group of characters with special powers or abilities who are harbingers of some kind of change or event. It could involve elements of adventure, mystery, and character development as they navigate their world.
The main characters in 'harbingers graphic novel' might be a diverse group. There could be a young, rebellious character who is the most powerful of the harbingers but also the most difficult to control. There may also be an older, wiser character who has been waiting for the arrival of the harbingers and has knowledge about what they are supposed to do. And perhaps there is a character who is conflicted about being a harbinger and tries to resist their fate throughout the story.
Most BSD light novels often have complex characters. Since they are based on literary figures, they bring in the depth and complexity of those original personas. For example, a character might have the same traits as a famous writer but with a unique twist for the BSD universe.
The appeal of all BSD novels lies in their ability to create immersive worlds. They draw readers in with their unique concepts and engaging storylines. For instance, the way they handle character relationships is very captivating. The conflicts and reconciliations between characters make for a great read.
Honestly, there's no definite answer on when the BSD manga will end. It all comes down to various factors like the author's inspiration, the popularity of the series, and the publisher's decisions.