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.
Overall, the 'Warrior Cats' cartoon stays true to the main storylines and characters of the books, but there could be changes in the animation style and some added elements for entertainment value.
You should start from the very beginning. Reading One Piece manga in sequential order helps you understand the character growth and the evolving story arcs better. There are no major detours or alternate reading orders necessary.
The funniness of a tree comic often comes from creative imagination. Maybe the tree has a crazy personality or gets into wacky predicaments. Sometimes, it's the contrast between the serious image of a tree and the comical events surrounding it that makes it funny.