I don't know for sure. But it could be the hero himself, perhaps his friends or comrades from his heroic days, and maybe the antagonists who oppose him.
As I haven't read the 'Once a Hero Novel', the main characters might include the titular hero. There could also be a mentor figure who guided him in his past heroics. Additionally, there may be a love interest who plays an important role in his life, either supporting or complicating his journey as a hero.
Since we don't have more information about the specific 'hero and hero disowned novel', it's hard to say exactly. But generally, there would be the hero character who experiences being disowned. There might also be characters like a mentor or a sidekick who play important roles in the hero's journey.
In 'Once a Runner, a Novel', the central character is a runner with a passion for the sport. He may have a group of fellow runners, some of whom are his friends and some his competitors. There could also be a coach or a family member who plays an important role in his running life. Their interactions and relationships form the backbone of the story, with the runner's journey towards achieving his running aspirations at the core.
In a 'hero club novel', the main characters could include a young and enthusiastic newbie who joins the club and brings fresh perspectives. There could be an older, more experienced member who mentors the others. And there might be a character with a mysterious past who has some hidden power or knowledge that becomes important as the story progresses. Also, there could be a character who is the heart of the club, always maintaining good relationships among the members and motivating them to keep being heroes.
I don't have enough information to say for sure. It could be a young protagonist who is just starting out in life and is suddenly made a hero. There might also be a mentor - like figure who helps the hero understand their new role.
There is also Raphtalia, who becomes an important ally of the Shield Hero. She grows and develops throughout the story, starting as a weak slave and becoming a strong fighter. And then there is Filo, the bird - like creature that also plays a significant role in the Shield Hero's adventures.
In the 'hero of darkness novel', the central character would be the hero of darkness himself. He might be joined by a group of comrades, each with their own unique abilities and backstories. One of them could be a wizard who specializes in the study of dark magic, not in an evil way but in a way to understand it better to help the hero. Another could be a warrior who has a past with the hero and is now by his side to fight against the common enemies. And there could be a female character who is a seer, able to foresee events related to the hero's journey through the darkness.
Not having read the 'hero killer a novel', we can only make educated guesses. The main character is most likely the 'hero killer' who drives the plot forward with his actions against heroes. There could be a mentor - like figure either on the side of the heroes or the 'hero killer' that helps shape their actions and beliefs. And there may be a love interest for the 'hero killer' or one of the heroes, which could add an extra layer of complexity to the story. There might also be a villainous character other than the 'hero killer' who is manipulating the situation from behind the scenes and making things more difficult for both the 'hero killer' and the heroes.
The main characters in 'the hero system novel' can vary depending on the plot and the focus of the story. It could be a young protagonist who discovers the hero system and is thrust into a world of adventure. There might also be an older, more experienced hero who acts as a mentor to the younger ones. These characters' relationships and how they interact with the hero system form the core of the story.
I'm not familiar with the specific 'hero killer novel', so it's hard to name the main characters. But typically, in a story like this, the hero killer would be a key character. There might be a love interest for the hero killer or one of the heroes, which could add another layer of complexity to the story. There could also be a powerful villain who is using the hero killer for his own purposes, and that villain could also be considered a main character in the sense that he has a major influence on the plot.
Since I'm not familiar with 'the hero guys novel', it's difficult to name the exact main characters. But if it's like most novels with a group of heroes, there could be characters with different personalities and skills. One might be the strong and silent type, another could be the smart and strategic one, and there might be a more humorous and light - hearted hero among them. They would all play different roles in whatever challenges they face in the story.