Final answer:
King Pluto can be described as a flat and static character if he does not show significant development or complexity in the story. If he does evolve or exhibit a multi-dimensional personality, he would then be considered a round character. The term protagonist refers to the main character, which does not inherently define the character's complexity.
Step-by-step explanation:
When discussing the character of King Pluto, it's helpful to use the distinctions provided by E.M. Forster in Aspects of the Novel. Forster differentiated characters into flat and round. A flat character is one-dimensional and represents a particular idea or trait without much depth or complexity; they tend to be predictable and do not undergo significant change throughout the story. On the other hand, a round character is more complex, often exhibiting a range of traits, and sometimes undergoing development or change.A protagonist is the main character of a story, and this role can be filled by a hero or a less-traditional character. For example, Satan is the protagonist in John Milton's Paradise Lost. However, while a protagonist is central to the story, they aren't characterized simply by being flat or round but by their role in driving the story forward.Static characters, much like flat characters, do not change significantly over the course of the story. They remain consistent in their behavior and their role within the narrative.Given this understanding, if King Pluto does not undergo significant change in personality or perspective and serves a consistent role throughout the narrative, he would most likely be described as a static or flat character. Conversely, if he experiences complexity and changes during the story, he could be considered a round character.