I’m talking really bad here, not just annoying or bratty or occasionally foolish. I mean really mean, violent, arrogant, vile, or scary. And from TV only, not films.
This fellow, on a short-lived series, was petite and bespectacled but inspired fear among both his henchmen and his opponents. He was ruthless and cruel, even to his wife.
This guy is arrogant, vain, will betray others at the drop of a hat, insults his colleagues, and jumps in and out of bed with hundreds of women, regardless of how strongly they may become attached to him.