These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Complete Monster: Angelus, described by one of the most ancient, powerful and evil vampires (Buffy's Season 1 Big BadThe Master) as "The most vicious creature [he'd] ever met," set the gold standard for evil in the Buffyverse, for centuries the scourge of Europe with countless murders, rapes and torture to his name. When he returned home, fresh from the grave, his little sister who opened the door remarked that he "had returned to her an angel." After slaughtering his family, he adopted the Latinate of angel (Angelus) as his name to mock that comment. Refusing to kill a longstanding nemesis vampire hunter, Angelus contented himself by murdering the man's wife and baby son, turning his young daughter into a vampire to force her own father to destroy her. His self-admitted masterpiece was seducing Drusilla, a pious, tormented girl with psychic powers, murdering her family and driving her to a convent before slaughtering everyone in the walls and turning her into a vampire to preserve his insane, broken work of art forever. When his soul is lost again, Angelus delights in psychologically tormenting his former beloved Buffy's friends and family out of disgust for the human feeling Buffy gave him. The ultimate culmination of this was his brutal murder of Jenny Calendar, leaving the corpse for her lover Giles to find in a parody of a romantic rendezvous. Angelus's evil extended to his hope of awakening a demon to suck all of humanity into a hell dimension for eternal torture, solely for the fun involved.