Kate Daniels/YMMV


 * Complete Monster - the audience of the Midnight Games seem to be this, as they enjoy watching warriors kill each other in particularly slow, painful ways; some of the participants fit the trope as well, but the crowning examples have to be the Reapers who
 * Erra fits this bill. She doesn't deny it when Kate calls her a psychopath (although she has to look up what the word means). When her children annoy her she kills them and pilots their undead bodies. She once "threw a hissyfit and blew up Bablyon", enjoys scaring crowds, just cause,
 * The Lighthouse Keepers, who are willing to kill thousands of innocents in order to achieve their fanatical anti-magic ends.
 * Magnificent Bitch - Aunt B, especially in the fourth book.