A mysterious figure also appears. This character seems to have some hidden motives and knowledge about the world of hunters that not even the main character is aware of at first. Their presence adds an air of mystery to the story.
One of the new characters is a young assassin. He is very stealthy and has a set of special skills for killing. He initially appears as an antagonist but later on, there are some interesting developments in his relationship with the main character. There is also a new guild master who brings in new rules and politics to the guild system in the story.
There is also a young trainee who looks up to the main character. This trainee has potential but is also naive in some ways. His interactions with the main character and other experienced characters provide some lighter moments in the story as well as show the growth of the next generation in this world.
In Solo Leveling Vol 6, there might be some new characters related to the deeper exploration of the gates. However, Jin - Woo remains the most important character. His friends and some of the guild leaders also continue to be important as they interact with Jin - Woo in different ways.
A mysterious figure appears in this volume. This character seems to have knowledge about the origin of the dungeons and the powers that the main character is obtaining. They add an air of mystery to the story and their actions and motives are gradually revealed as the story progresses.
There could be new characters in Solo Leveling Volume 9 novel. It's possible that there are new recruits in the hunter organizations that Jin - Woo is associated with. These new characters could bring in fresh perspectives and new storylines. Maybe there are also some characters from other dimensions or parallel worlds if the story takes a more fantastical turn in this volume, which would add a whole new layer of complexity to the plot.
The protagonist is obviously one of the most important characters. Also, there are his friends and comrades from the guild who play significant roles in the story. Some of the guild leaders are important as well as they influence the protagonist's journey in different ways.
The main character is Jin - woo. He is the key figure in the story who goes through the process of leveling up.
In 'vol 3 solo leveling novel', the main character is the center of the story as he continues his leveling adventure. There could be his friends or comrades who are also main characters in the sense that they support him, fight alongside him, or are involved in the plot twists. And don't forget there may be powerful enemies who are also key characters as they drive the conflict in the story.
The protagonist is an important character. There are also his friends and comrades who play significant roles in the story.
I'm not entirely sure which new characters might be introduced in chapter 130. But the main character throughout Solo Leveling is Jin - woo. He's the central figure in the story.