Since I haven't read the book, I can't say for sure who the main characters are. But I would expect there to be a king or some sort of royalty as it's a 'king series' novel.
I'm not sure specifically as there could be many different stories within a 'king series' that has 'up in smoke' in it. It might be about a character's rise to power (the 'king' part) and how their plans or life go 'up in smoke', meaning they fall apart.
I'm not entirely sure, but there might be a character who is a soldier or someone involved in a military - like situation. This character could be central to the story as they navigate through the events in the 'tree of smoke novel'.
I don't know for sure as I haven't read it. But it could have characters like the owner of the smoke room, who might be a wise old man with a lot of stories. There could also be a young, curious visitor who sets off different events in the story.
In 'picked up a demon king to be a maid novel', the most obvious main characters are the one who does the picking up and the demon king who becomes a maid. The former might be a curious or kind - hearted individual. The demon king, on the other hand, is likely to be a powerful and complex character with their own motives and backstory. There could also be other characters such as the demon king's former subordinates who might try to find their master or characters from the human side who are intrigued by the new maid in town.
I don't know for sure as I haven't read this novel. But usually, main characters are the ones who drive the story forward. They could be ordinary people dealing with extraordinary situations related to the idea of 'smoke getting in their eyes' in a metaphorical sense.
The main character is the girl who is the daughter of smoke and bone. She has a unique personality and abilities. Then there are her friends and foes. Some of her friends help her in her journey, like the ones who might share some knowledge about her origin. Her foes, on the other hand, are often from the opposing forces in the different worlds she is part of. There may be some magical beings that are both allies and antagonists at different times, depending on the situation in the story.
I'm not entirely sure as I haven't read it recently, but usually in such stories there are characters who are part of the Native American community. Maybe there's an elder who has the knowledge of the smoke signals and a young person who is learning about their culture.
There could be an antagonist, perhaps a rival who also wants to be king or someone who wants to stop the protagonist from achieving the throne. And then there may be supporting characters such as friends or family members of the protagonist. For example, a sister who gives the protagonist emotional support during difficult times in his quest to be king.
It's possible that the main character is someone who has a unique perspective on torts. They could be an outsider who comes into the world of tort law and shakes things up. There might also be supporting characters like colleagues, friends, or family members who either help or hinder the main character's journey in this world of 'the king of torts'.
I don't know for sure as I haven't read it. But likely there's the ruthless king himself. There may also be his advisers, some of whom might be trying to temper his ruthlessness, while others might be enabling it. And there could be a love interest for the king, who might try to change him or be affected by his actions.