Just looking at Ruk wouldn't give one much pause.  He has the look of a street waif about him; a little on the short side, very much on the scrawny and scrappy side.  He looks ostensibly human, though like the rest of his kind Ruk sports decidedly animalistic traits - in Ruk's case, wings covered in jet-black feathers, a matching fan sprouting from his sacrum to aid in flight, and odd, four-toed avian feet.  While Ruk's facial structure is decidedly human, his face is slightly wedge-shaped  and somewhat elongated, and his teeth are decidedly beak-like from afar.

At his full height, Ruk stands around five-seven, with black hair and bright, yellow eyes.  He dresses in simple clothing that, on the one hand, shows evidence of being patched back together and, on the other, doesn't show any other signs of wear and tear.  He doesn't use weapons, though when he gets riled up Ruk can call up particularly noticeable displays of magic.