A character is a person presented in a dramatic or narrative work, and characterization is the process by which a writer makes that character seem real to the reader. A hero or heroine, often called the protagonist, is the central character who engages the reader’s interest and empathy. The antagonist is the character, force, or collection of forces that stands directly opposed to the protagonist and gives rise to the conflict of the story. A static character does not change throughout the work, and the reader’s knowledge of that character does not grow, whereas a dynamic character undergoes some kind of change because of the action in the plot. A flat character embodies one or two qualities, ideas, or traits that can be readily described in a brief summary. They are not psychologically complex characters and therefore are readily accessible to readers. Some flat characters are recognized as stock characters; they embody stereotypes such as the "dumb blonde" or the "mean stepfather." They become types rather than individuals. Round characters are more complex than flat or stock characters, and often display the inconsistencies and internal conflicts found in most real people. They are more fully developed, and therefore are harder to summarize. Authors have two major methods of presenting characters: showing and telling.

Characters can be convincing whether they are presented by showing or by telling, as long as their actions are motivated. Motivated action by the characters occurs when the reader or audience is offered reasons for how the characters behave, what they say, and the decisions they make. Plausible action is action by a character in a story that seems reasonable, given the motivations presented. See also plot.