“Repeat after me, there are the living and the dead, there are day-folk and night-folk, there are ghouls and mist-walkers, there are high hunters and the Hounds of God. Also, there are solitary types.”
“What are you?” asked Bod.
“I,” she said sternly, “am Miss Lupescu.”
“And what is Silas?”
She hesitated. Then she said, “He is a solitary type.”
— The Graveyard Book by Neil Gaiman