Bryon is an important character. He is one of the central figures through which we see the story unfold. His experiences and growth form a large part of the narrative.
Mark is also crucial. His relationship with Bryon is complex and changes over time. Their interactions drive a lot of the plot and show the different ways they respond to the changing circumstances in their lives.
I'm not entirely sure, but there must be a protagonist who drives the story forward. Maybe it's a young person dealing with the typical issues of adolescence.
I'm not entirely sure as I haven't read it in full, but there might be a war - hardened soldier as an important character. He could be the one leading the charge or making tough decisions in the middle of the chaos.
There may be a love interest or a supporting character like an old-timer who has been on the waterfront for years. The love interest could provide motivation for the protagonist to make changes, and the old - timer could offer wisdom and historical context about the place and how it has changed over time.
Lyddie is obviously the most important character. She is the protagonist and the story revolves around her journey. Then there's her mother, who is an important figure in Lyddie's past and whose actions have an impact on Lyddie's life. Rachel, Lyddie's sister, is also important as Lyddie has a strong sense of responsibility towards her.
The protagonist is definitely an important character. His actions and thoughts drive the story forward. There might also be some secondary characters who interact with him and help to show how much of an outsider he really is.
Eragon is the most important character. He is the protagonist, a young Dragon Rider. Saphira, his dragon, is also crucial. She is his partner and has her own unique personality. Brom is an important character too. He is a storyteller who becomes Eragon's mentor and helps him on his journey.
In Flatland novel, the Square is a central character. He is the narrator for most of the story and his journey of discovery forms the main plot. There is also his grandson, who shows the next generation's potential for different thinking. And the Priest - Circles are important as they are the ones who enforce the social and religious rules in Flatland.
In 'Heidi the novel', Heidi is the key character. She is a young girl with a pure heart and a love for nature. Her grandfather, who initially seems a bit of a recluse but has a warm heart deep down. Peter, he's the boy who takes care of the goats and is Heidi's playmate. He has his own simple charm. Clara is another significant character. She is a frail, wealthy girl from the city. When Heidi goes to the city to be her companion, their lives become intertwined. The interactions between these characters drive the story forward and show different aspects of human nature and life in different settings.
There is usually the archaeologist. They are important as they are the ones who often discover the mummy and start the whole chain of events. Another important character could be the mummy itself, as it is the central focus of the story.
Arthur Holmwood is significant. He is Lucy's fiancé and is deeply involved in the attempts to save her from Dracula. Quincey Morris is also important. He is an American and brings a different perspective to the group of characters. His loyalty and courage are important in the fight against Dracula.