I don't know for sure. But likely the heavenly demon is one of the main characters. There might also be characters who are either his allies in his vengeance or those who are the targets of his revenge.
Well, from what the title suggests, 'vengeance of the heavenly demon web novel' could be a story centered around a powerful demon from the heavens. Maybe there are other characters who oppose this demon, and he has to fight against them while also fulfilling his vengeance. It might also include elements of magic, different realms, and complex relationships among the characters.
One of the main themes is vengeance. It's about the protagonist's journey to avenge the injustice he has suffered. Additionally, power struggle is another theme. In the world of the novel, power is crucial for survival and to carry out vengeance. Moreover, loyalty and betrayal are also themes. The main character may encounter people who are loyal to him as well as those who betray him on his path of vengeance and power - seeking.
In a 'heavenly idol web novel', the main character is probably the idol themselves. They might be someone who has a mysterious past, perhaps related to the heavens as the title suggests. There could be a mentor - like figure, an older idol or a producer, who helps them navigate the complex world of idols. And then there could be a group of side characters, such as the idol's family members who might have mixed feelings about their career choice, adding more depth to the story.
I'm not sure specifically as I haven't read this exact novel. But typically, in a novel about vengeance, there would be a character who has been wronged and is seeking revenge. There might also be an antagonist, the one who committed the wrong in the first place.
Since I haven't read it, I can't say for sure. But usually in a vengeance - themed novel, there would be a protagonist who is seeking revenge and probably an antagonist who is the target of that revenge or someone who stands in the way.
I'm not sure specifically as I haven't read the novel, but typically in a war - centered story like this, there would be a protagonist who is seeking vengeance. There might also be a villain or antagonist who is the target of that vengeance or who stands in the way of the protagonist achieving it.
The titular Heavenly Demon Instructor is obviously a main character. He is the central figure around which the story revolves, with his unique skills and teachings.
The central figure is the Heavenly Demon who has been reborn. Alongside him, there may be mentors or elders who play important roles in his growth. Then there are antagonists, probably powerful figures from other factions who oppose the Heavenly Demon. And there could be some female characters as well, perhaps love interests or comrades who fight alongside the main character.
Another common main character could be a hero who is trying to oppose the great demon king. This hero may have special powers or skills that are meant to counter the demon king's tyranny. For example, they might possess holy magic or be a master swordsman. They play a crucial role in the story's conflict and development.
There are likely to be Space Marines as main characters. They are often the heroes in the Warhammer stories, fighting against the forces of chaos.