I am going to have to say that it's a tie between Kai Leng, Saren 2.0- I mean the Illusive Man and the Catalyst vent boy from Mass Effect 3.
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[quote][b]Posted by:[/b] Haloroach [quote][b]Posted by:[/b] H9man Desmond Miles[/quote] Oh god. That ending. That -blam!-ing ending.[/quote]