From A Wiki of Ice and Fire
|Race||children of the Forest|
|Book||A Dance with Dragons (mentioned)|
Black Knife is one of the children of the forest in service to last greenseer. He/she does not speak the Common Tongue. His/her true name is too long for the human tongue according to Leaf, so Meera Reed and Bran make up the name Black Knife.
Black Knife has nut-brown skin that is dappled like a deer's with paler spots, large ears and large eyes slitted like a cat's eyes and three fingers and a thumb with sharp black claw instead of nails.
A Dance with Dragons
Black Knife, along with the other remaining children of the forest, serves the last greenseer in his cave beyond the Wall.
- ↑ A Dance with Dragons, Chapter 34, Bran III.