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.
Manganese is a very dull beige Catto with pink pupils and a fluffy tuft of hair in between their ears. Their ears and forehead are a dull blue, and their torso along with the patch on his mouth is slate black. The letters "Mn" are on their torso.