The Shape Shifter is that character / archetype that switches sides.
In The Matrix (199), it is Cypher, who is initially on Morpheus' side but then gives them up to Agent Smith.
In Star Wars (1977), it is Han Solo, who initially is critical of Obi Wan, the Rebellion and Luke but later helps Luke defeat Darth Vader.
Other characteristics also define the Shape Shifter: for example, s/he is often a Romantic Competitor. In The Matrix (1999), Cypher vies for Trinity's attention.
Also, s/he is often that person who could have been the Hero. In Raiders of the Lost Ark (1981), Belloq is not far from being a Hero archetype. Nor is Han Solo (Star Wars, 1977).
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