Which of these is NOT a characteristic of a flat character?

A flat character is defined by their simplicity and lack of complexity. They typically possess a limited emotional range and do not undergo significant developments throughout the narrative. This characteristic distinguishes them from round characters, who are more developed and complex, often undergoing significant changes in response to events in the story.

In the context of the question, a flat character lacking depth is a fundamental trait, as it signifies they do not have profound backstories or intricate motivations (as noted in the first characteristic). The ability to be easily summarized highlights their straightforward nature, which adds to their role in the story without requiring elaborate exploration. Additionally, flat characters often serve specific purposes in the narrative, such as representing an archetype or maintaining a certain tone.

Therefore, the answer indicating that flat characters undergo a significant change is correct because it directly contradicts the essence of what defines a flat character. Flat characters typically remain static, fulfilling their roles without the dynamic evolution seen in more complex characters.