I'm not sure specifically as I haven't read the novel. But typically, there would be a protagonist, perhaps a noble or a commoner with a special role. There might also be a villain who is causing the silent war or trying to take over the kingdom.
The main theme could be about power struggles within a kingdom during a silent, unspoken war. Maybe it's about political intrigue, or the fight for resources without open combat.
I'm not sure specifically who the main characters are without reading the novel. But they could be soldiers on the front line. Maybe there's a young and inexperienced soldier who has to grow up fast in the face of war, and an older, more experienced one who acts as a mentor.
There might be a heroic soldier who is the protagonist, bravely fighting for his beliefs. There could also be a nurse tending to the wounded, showing the other side of the war. And perhaps a general who is making the strategic decisions that impact the lives of many. These are common types of main characters in Civil War stories.
Sora is one of the main characters. He is a Keyblade wielder who often finds himself in the middle of the action during the Keyblade War. Riku is another important one, with his own journey and connection to the Keyblades. Xehanort also plays a major role as he has his own dark plans related to the war and the power of the Keyblades.
I don't know for sure as I'm not familiar with this particular 'the kingdom novel'. It could have a brave knight as a main character.
There could be a detective character in the 'Silent Witness Novel' who tries to communicate with the silent witness. And the silent witness might be a female character, perhaps a young woman who is afraid to speak out at first. There might also be a villain in the story who is trying to keep the witness silent.
James Sunderland is likely one of the main characters as he is central in the Silent Hill 2 story.
Since I'm not familiar with the 'the silent woman novel', it's hard to name the main characters precisely. However, based on the title, the silent woman is bound to be a central figure. There might be a male character, perhaps a love interest or a family member like a father or a brother, who plays an important role in the story. There could also be a confidant, someone she might eventually open up to, or an antagonist who tries to break her silence in a negative way.
There might be a supporting character who helps the main character break out of their shell of silence. This character could be very talkative or have some special ability to communicate that contrasts with the silent voice of the protagonist.
There's Shoya Ishida, who is a complex character. He starts off as a troublemaker, but as the story progresses, he goes through a significant transformation. And then there's Shoko Nishimiya, the deaf girl. She is very kind - hearted despite all the hardships she faces. Their relationship forms the core of the story, and other characters also play important roles in their lives, like their classmates.