In the Kingkiller Chronicles, Kvothe's companion, Bast, does some pretty odd and magic stuff, like ripping a bird in half and turning it into flame. What is Bast? A demon? Or is he a sympathist (did I spell that right?)? Or something else I haven't thought of?
.... Bast is later revealed to be a Fae creature under a glamoury.
His true appearance is similar except for his eyes become fully blue with no sclera and his boots turn to cloven hooves. He is over 150 years old and a noble of the Faen Courts. His full title is Bastas, Son of Remmen, Prince of Twilight and the Telwyth Mael.
From Patrick Rothfuss's blog:
And from The Name of the Wind:
"Chronicler, I would like you to meet Bastas, son of Remmen, Prince of Twilight and the Telwyth Mael."