Caius is a compelling villain, in part because his villainy isn't the typical in-your-face, menacing, power-hungry gnashing of teeth. It's sorrow that drives him, and as the source of this sorrow becomes clearer, your empathy grows. His emotions are distinctly, authentically human, and he isn't inherently evil; thus, he is a much more interesting villain than the usual frothing maniac. Caius gets his chance to chew the scenery a number of times, though where male characters are concerned, your focus is generally on Final Fantasy XIII-2's other lead: Noel.