Luciano Bradley, Psycho for Hire and Knight of Ten from Code Geass. Bradley is even known to be a Complete Monster in the eyes of most of the other characters in the show. Fearless Action Girl Kallen is visibly frightened the moment she finds out she is in the same room with him; the fact that he implies that he plans on raping and torturing her does not help alleviate that fear. He also kills his own men without a care (whether needed or not) and loves to kill people slowly using his mecha's energy drill while asking them what's the most important thing for them. It's taken to the point where neither of his KOR allies, Suzaku (whom he almost killed for the hell of it, and whose deceased girlfriend he insulted) and Gino (whom he called a rich boy whose family name is the only reason for his position), seem to care at all when Kallen kills him in battle (whereas she and Gino even exchange some semi-friendly banter).
It's worth noting that Luciano does not, in fact, have a single line of dialogue in which he isn't insulting, threatening, or otherwise expressing a desire for hurting someone. and at several points comments that his only reason for being a soldier is because that way, he can kill as many people as he wants and not be punished.
As a case study, Luciano Bradley, for his part, does get a Freudian Excuse. He had Abusive Parents, and he killed his abusive dad when he was a child, apparently in self defense. However, he can't gain the audience's admiration or pity because it's largely irrelevant to the fact that he enjoys killing people. There's also, then, the fact that it isn't even talked about in the actual anime, just in supplementary materials; as well as the fact that he isn't the only character in the series to have abusive parents.
How about V.V.? He manipulates Suzaku to kill Zero by telling him about Geass and that he's responsible for Euphemia's massacring Japan. Then he kidnaps Nunnally and forces her to be part of the Britannia family again, which has quite the bad effects on the girl's psyche.
Here's the interesting atrocity that puts him in Moral Event Horizon: he killed Lelouch's mother Marianne purely out of petty jealousy and hid it from his father Charles. It finally gets his own twin brother, who was NOT an angel himself, to finally kill him after he has lost the battle with Lelouch. If you're making Emperor Charles look good, you're definately really bad.
