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] Mysten Sarah Palmer and Andrew Del Rio. Who was in charge of writing these characters? They're so awful.[/quote]I thoroughly enjoyed Del Rio. He's not a bad character just because he's an irritating idiot. I liked him because he stood up to the Cheif. That's ballsy. I don't recall any terrible characters. Maybe Zer0, but only because he was like a joke character except the joke wasn't funny.