Which character type is characterized as minor figures in the story that change little or not at all?

The character type that is characterized as minor figures who change little or not at all is known as flat characters. Flat characters are typically defined by a single trait or a limited set of traits, making them relatively uncomplicated and predictable in their behavior throughout the story. They often serve a specific purpose, such as supporting the development of the main characters or advancing the plot, but do not undergo significant development or change.

In contrast, round characters are more complex and exhibit a range of emotions, motivations, and development. Stock characters are often stereotypical and recognized by audiences for their familiar traits but may still exhibit some degree of variation in different contexts. Principal characters, typically the main characters, are usually well-developed and undergo significant change or growth throughout the narrative. Flat characters therefore play an essential role, often providing a stable backdrop against which the development of round or principal characters can be measured.