Well, in a graphic novel like this, there could be a group of characters. There might be a wise old sage - type character who knows a lot about the demons and can guide others. There could also be a renegade demon who decides to side with the humans against the other demons for some reason. And of course, there may be an ordinary human who gets caught up in the whole mess of the 1000 demons and has to find a way to survive and make a difference.
I don't know for sure since I haven't read it. But it's likely there are demons as main characters.
I'm not entirely sure who all the main characters are specifically, but there's likely a hero figure who takes on the demon - killing task.
The main demon character could be really interesting. Maybe he has some unique powers or a tragic backstory that makes him stand out. And the lead angel, who has to face tough decisions and battles against the demons.
A demon lord could be another main character. This character would be very strong and cunning, always devising plans to overthrow the gods or gain more power in the demon realm. Maybe he has some tragic backstory that led him to become so evil.
The main characters are Sierva María and Cayetano Delaura.
Robert Langdon is one of the main characters. He is a symbologist who gets drawn into the mystery.
Nie Li is definitely one of the main characters. He is a very intelligent and powerful young man with knowledge from the future.
The main character is a young demon who discovers his special crest powers early on.
Often, there are side characters who are former victims of the demons but have managed to survive. They play important roles in providing information about the demons' weaknesses. And then there could be a mysterious figure who seems to have a connection to both the demons and the gods. Their true motives are often a mystery throughout much of the novel, adding an element of suspense to the story.
In some 'tales gods and demons novel', there might be an ancient god who has been in slumber for ages. He wakes up to find the world overrun by demons. His character arc would be about regaining his former glory and saving the world. And there could be a wily demon who is always plotting against the gods, constantly creating new challenges for the main characters.