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Protagonists are the main characters in a story who drive the plot forward and face conflicts or challenges. They are usually the ones with whom readers sympathize and root for.
Antagonists are characters or forces that oppose or create conflicts for the protagonists. They act as obstacles to hinder the protagonist's progress.
Foils: Foils are characters who contrast with the protagonist, highlighting their qualities or characteristics.
Dynamic characters undergo significant changes throughout a story, often due to their experiences or interactions with other characters.