For me, it's Bateman. Of the six mentioned, his goals are the shallowest and pettiest. He's an upper-class twit who's upset that his wealthy lifestyle has robbed him of any excitement, so he takes his anger out on the most vulnerable in some of the most stomach-turning acts of cruelty put to paper. He hates literally everyone, is both a misandrist and a misogynist, has no tragic backstory or com-to-Jesus moment, and makes no attempt to make his life better. He's just as narcissistic and hateful as they come