Final answer:
In excellent children's fiction, main characters are often dynamic/round characters who experience change and growth in response to events within the story.
Step-by-step explanation:
In excellent works of fiction for children, the main characters typically undergo change in response to life-altering events. These characters are known as dynamic/round characters because they show growth and development over the course of the story. Unlike static or flat characters, who remain the same throughout the narrative, dynamic characters learn and evolve, sometimes gradually or sometimes due to an epiphany. This character evolution is often central to the storyline and crucial for engaging the reader.
Character foils are used to highlight certain traits of the main characters through contrast, but they do not necessarily result in the main character being a round character themselves. While dynamic characters are essential for compelling storytelling, character foils serve a different purpose by emphasizing the traits and development of the protagonist or another character.