Yammy Riyalgo (Sometimes romanized as Yami or Yammy Llargo) is the tenth and zero Espada in Aizen's army, his rank depending on which form he is in.
Yammy is very large, both tall and muscular, with skin that is slightly darker than that of the average Arrancar. He has red, jagged tattoos on his cheekbones, and is, for the most part, bald, with the exception of a black ponytail on the back of his head.
Yammy's mask remnants take the form of a jaw bone on the bottom of his chin, with his hollow hole directly below that. His tattoo is located on his right shoulder. Yammy's uniform consists of the traditional white pants and a jacket, which is constantly open, revealing his chest.