Cattos as a species are cat-like creatures composed of a head, torso, and cat ears. Most Cattos have big, white eyes that are devoid of pupils, and a cat mouth. They all resemble an element of the Periodic Table in some way.
Sulfur is a yellow Catto with tufts of hair in between her ears, and an incredibly long torso that can extend and retract. At her normal height, there's a letter "S" on her torso. When she's long, the letter multiplies vertically. Her neck is particularly fluffy.