The main character is obviously central. There could be antagonists within the hero's party who make the main character want to quit. And perhaps there are new characters that the main character meets after leaving the party, who help shape their new journey.
I'm not sure specifically as I haven't read it in full, but likely there is the main character who quits the hero's party. There may also be other members of the party who play important roles, like the leader of the party or a close friend of the protagonist.
The interesting aspect might be how the novel delves into the reasons behind quitting. Maybe there are complex relationships within the hero's party that drive the main character away. It could also show a different side of the hero's journey, like what happens when one steps out of the spotlight.
The main character is likely the one who decides to quit the hero party. There may also be other members of the hero party who play important roles, like the party leader who might be shocked or angry at the decision. And there could be new characters that the protagonist meets after leaving the party.
I'm not entirely sure as I haven't read it in detail. But typically, there would be the character who is banished. There might also be members of the hero's party who play a role in the banishment or are relevant to the story later on.
In 'I Quit the Hero's Party' novel, the protagonist who decides to leave the party is a key character. There might be a leader in the hero's party who has a particular relationship with the quitting character. Maybe there are also some side characters who are friends or foes of the main character. These characters would contribute to the story's development, whether it's through their reactions to the quitting or their interactions with the main character as they pursue their new path.
We don't really know for sure who the main character is just from the title. However, it's reasonable to think that it's the character who experiences the expulsion from the hero party. This character could be a human, an elf, or any other fictional race. Their backstory, like where they came from, what their original intentions were in the hero party, and what their unique abilities are, will likely be explored as the story progresses.
The important characters include the banished one, of course. There could be a love interest he meets along the way. This character can add an emotional dimension to his story, like giving him a reason to strive for something more. Also, there may be side characters in the new places he visits who either help or hinder his progress.
Perhaps the leader of the hero party is an interesting character. Their reaction to the protagonist's decision to quit could reveal a lot about their leadership style and values. Also, any side characters who were friends with the protagonist in the hero party but now have to deal with the new situation could be quite engaging. They might be torn between loyalty to the party and friendship with the protagonist.
I'm not sure exactly without reading the novel, but typically there would be the hero themselves. They are the central figure around which the story revolves.
The main themes can be seen as perseverance. The character has to keep going despite being banished. There's also the theme of change. His life has changed drastically, and he has to adapt to this new reality. Additionally, there might be a theme of revenge in some cases, if he feels wronged by the banishment and wants to prove himself to those who cast him out.
The main characters are likely the wife and the hero. The wife is probably the central figure from whose perspective the story is told. She has to deal with all the implications of being married to a hero. The hero, on the other hand, is the one with the extraordinary abilities or deeds. There could also be a villain or antagonists who create problems for the couple, which would also make them important characters in the story.