What are one dimensional characters?

One-dimensional characters are those that lack depth and complexity, often defined by a single trait or stereotype. They typically serve specific roles in a narrative without significant development or growth throughout the story. As a result, they may come across as predictable or unrealistic, failing to evoke strong emotional responses from the audience. Examples include the "dumb jock" or the "damsel in distress," who often exist to fulfill certain tropes rather than as fully realized individuals.