I have a sim I created inspired by the song Reverend Mother by The Wake. Her traits are Evil, Snob Romantic and some custom traits. I Created her to kidnap Max Villareal and force him into the fold. She's a Vampire with undead aura. I have her usually married to another evil sim of mine Julian who is a special kind of evil. Julian is an evil spellcaster sorcerer. His traits are Paranoid, erratic, evil, with custom traits like demon and Ares added in for extra measure. I use him to break up couples. Cause Chaos and as somebody the other spellcasters can despise on principle alone.
Both are just so much fun to play when I play them but they are added into a game to cause as much trouble as possible.