Nightmare is a feisty, crude, and rather dissing cat. However, he is often calm, and can be rather loving and a sweetheart when he wants to be. He has a single eye, that being his left, which is a bright cyan in the pupil. His other is missing, resulting in a small 'x' where it used to be. His fur is a coal-black, fluffy and his right back paw a crisp white, as if wearing a singular 'sock'. His paw-pads are a bright cyan to match his eye, and he’s quite the unique cat.