Darth Malak (Star Wars: Knights of the Old Republic)
Harley Quinn (Batman)
Jenova (Final Fantasy VII)
Mini-Me (Austin Powers)
Pyramid Head (Silent Hill)
T-800 (The Terminator)
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Golden Sun isn't half-bad, but it needs to cut the crap with the Yes/No questions, which make Zubats look like thylacines in comparison.