Detective protagonists are central characters in mystery and crime stories who investigate and solve cases. They often possess keen observational skills, logical reasoning, and a strong sense of justice. These characters can be professional detectives, private investigators, or amateur sleuths, and they typically face various challenges as they uncover clues and piece together evidence. Common traits of detective protagonists include a strong moral compass and a determination to seek the truth. They often interact with a range of characters, including suspects, witnesses, and law enforcement, which helps to develop the plot. Famous examples include Sherlock Holmes and Hercule Poirot.