doppelganger
a technique of creating cloned or similar characters that either strengthen a view through underscoring or opposition. Usually these characters have a similar look, names and are genetically related. Their use is important for continuity. Generally less important characters, they can shore up structure when the story moves to different locales and the characters do not. I look upon it as double or triple casting roles to serve the protagonist at all point in the stories development.
Ed Patterson
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