YMMV / The Demon Princes

• Complete Monster: The titular Demon Princes are a group of vicious space pirates who together massacred an entire colony world and sold the survivors into slavery. Three of them are the nastiest of the bunch.
  • Attel Malagate, known as "The Woe," is a Smug Snake member of the normally peaceful alien race the Star Kings. Malagate plans to despoil a peaceful planet and establish his own dominion over it, murdering anyone who tries to stop him. Malagate remains hidden for most of the novel, his two Co-Dragons committing murder and mayhem for him as he schemes to conquer his home planet and rise above humanity and his own people.
  • Kokor Hekkus, a Serial Killer known as "The Killing Machine," kills sapient beings to harvest substances from their bodies that prolong his life. Hekkus has been at it for over a century and has no compunction kidnapping and doing his harvesting from children. Hekkus has remained on his planet for years in order to enact wars, conquests and atrocities for his own amusement, causing every misfortune that befalls the world solely for a love of the chaos with which he surrounds himself.
  • Viole Falushe, ruler of the Palace of Love, runs a self-centered cult around himself and his "beauty," having the most beautiful people of his world taken to serve him for their whole lives. Falushe experiments with women in forced breeding programs to create a clone of the woman he once desired most, and force her to love him. The forced breeding program is what made the original woman commit suicide.
• Hilarious in Hindsight: A character in Star King rents a house under the assumed name "Spock".
• Moral Event Horizon: The Demon Princes crossed this (again) when they massacred and enslaved the population of a planet.
  • By the time we meet them, they've long since relegated themselves to living on the wrong side of that line.