Every Ape and His Brother/YMMV


 * Complete Monster: The Evil Hair Maiden in "Slaughterzied" and "Die Die Die!!!" qualifies. Arguably, so does the Serial Bomber after he "leaves half a town smoking in a mushroom cloud" to punish one adultress.
 * The Poultry Killer may come across this way to members of any Animal Wrongs Group.
 * The Blue-Cloaked Men are supposedly this.
 * Crosses the Line Twice: The entire point of some songs.
 * Moral Event Horizon: Most characters in most of the songs cross it at some point, even if they have to do a lot of puppy kicking to get there.
 * Stupid Evil: The scientist in "On the Ethics." Why, oh why are you creating that monster to begin with? And how will you possibly ensure that you yourself never become a victim? Especially when you forced him to kill his own girlfriend and gave him a perfectly understandable revenge motive?