Rukia has light skin and purple eyes, she's Short and petite, Her hair is black, with several strands of hair always hanging between her eyes. 

Rukia in her Shinigami form wears a standard shihakushō, which consists of black kimono worn by Shinigami. A white undergarment and obi sash, and Waraji

Rukia's zanpakutou is Sode no Shirayuki, which is currently sealed, it seems like a regular katana with a rectangular tsuba with a vaguely flame-like pattern on the long sides and a reddish-brown hilt.