An animal sold at a pet shop, but they don't sell at all and are left over in large quantities. Their personalities vary, and their gender is randomly male or female. They look like they are wearing black penguin costumes, have the faces of four-year-old girls, and wear collars around their necks. They are oviparous creatures. Their intelligence is low. Females occasionally lay eggs, and babies are born when the eggs are incubated. They love sweets. They only say things like "Gugugaga," "Guguyaya," "Gugaa," "Gugya," or "Gya." They burst into tears immediately when hit or scolded. They are innocent. When customers come, they try to attract attention by dancing or singing.