Leland Gaunt, "Needful Things"
Bad boy, bad boy, whatcha gonna do?: Run a quirky small business in Castle Rock that sells useless junk to townspeople in order to get them to do your bidding. You know, just your average: widespread damage, violence, and murder. Then when everyone in town has run amok, make like a gypsy and set up a shop in an adjacent 'burb.
Scare Factor: An eight. A grandfatherly figure who can read you better than any loved one and he caters to your shopaholic tendencies? No one stands a chance, at least in America. Where consumerism is King, plastic is fantastic and mass consumption is needed to function.