Complete Monster/Elfen Lied

Elfen Lied has a dangerous race of mutants as protagonists. They are, while somewhat sympathetic, just plain Ax Crazy. However, the most despicable beings in this series seems to be the Humans themselves.


 * The Unknown Man from the manga is indisputably one of these. In order to find our protagonist, he  Needless to say, , it's quite satisfying.
 * Mayu's stepfather qualifies. He is a child molester who loved to sexually humiliate her, and it's shown he went as far as to sodomize her. He gets no comeuppance for this, as he's only shown in flashbacks.
 * There was also Tomoo, the sociopathic ringleader of the group of bullies who tormented Lucy in her childhood at the orphanage/school. The evil, sadistic little brat was a racist against the "inhuman" Lucy for no valid reason and was shown to have no redeeming qualities whatsoever: one suspects the other kids stick with him and take part in bullying along with him specifically so he won't go after them. He visibly got a thrill out of beating an innocent puppy to death, and he drew it out as long as possible not simply to torture Lucy, but because he was enjoying killing another living creature so damn much. While it's debatable if the other children deserved to be massacred by Lucy afterwards, Tomoo definitely got what was coming to him.
 * Director Kakuzawa, Bandou, Nousou, and Lucy barely escape this category. The first . The second for showing that he can show empathy with at least one person, as well as having some sense of honor. Nousou gets saved for showing regret for his actions and then getting an Alas, Poor Villain moment when he is killed before he can atone for what he did. As for Lucy, her tragic backstory and the fact that her only motivation in her life is to pull her away from that position.
 * However, while Lucy/ herself can not, by any stretch, be considered a Complete Monster,