Complete Monster/Grand Theft Auto


 * Donald Love of Grand Theft Auto fame certainly qualifies. While Grand Theft Auto III only vaguely alludes to his monstrous tendencies, Grand Theft Auto Liberty City Stories sheds some light on his true personality.
 * That reporter you mentioned weren't a saint either. Damn, Toni Cipriani probably commits the greatest canonical atrocities of any GTA protagonist to date thanks to the orders of these two.
 * Ray Bulgarin from Grand Theft Auto IV. Aside from his whole human smuggling past, his Chronic Backstabbing Disorder and his generally nasty, aggressive personality, his appearance in The Ballad of Gay Tony makes him an even bigger Complete Monster. While he may appear Affably Evil or even somewhat petty and harmless at first (in stark contrast to his brief appearances in the main game), he soon gets several Kick the Dog moments:
 * Billy Grey certainly qualifies by the end. He starts a pointless and destructive gang war just 'cause, then uses Jason's death as an excuse to jack a Triad heroin shipment. When he decides he doesn't like Johnny's attitude (y'know, involving rationality, common sense, and discretion), he arranged to have the Triads ambush him. But worst of all? After he gets arrested at said ambush, he pretty much immediately rolls over on the entire gang, shitting all over his vaunted "brotherhood" for immunity. When Johnny confronts him at the end, he doesn't even bother to bullshit him with excuses, just forces him to shoot him down. No redeeming features, no remorse, zero empathy, sadistic, manipulative, selfish... yeah, he's all over this trope.
 * Last but not least...The Dreaded Dimitri.