What makes a character round, flat, dynamic, or static?

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A round character is a character who is complex and increases in complexity throughout the story. A flat character has little or no change in the development of its personality and has little emotional depth presented throughout the story. A dynamic character is like a round character but is usually used to describe a character that goes through a major change in attitude or personality. A static character is a character that doesn't change in any major way in regards to personality/attitude. Hopes this helps.