Movie: Bad Santa (2003)
Villains: Willie T. Stokes and Marcus
Played by: Billy Bob Thornton and Tony Cox
Perhaps it's obvious from the film's title, but Willie T. Stokes (Thornton) does some terrible stuff in this movie, despite being the protagonist. Technically he's not the film's villain, but prior to the events of Bad Santa, he's annually spent Christmas Eve/early Christmas morning burglarizing shopping malls.
He pulls off the capers by working as a mall Santa with his dwarf partner Marcus (Cox), who plays an elf. Once the mall shuts down for Christmas Eve, they disable the security system and go on a looting spree. This pair would prompt most villains to ask, "C'mon. Couldn't you wait until the 26th?"