Attends Gugu-Gaga School. The school has grades one through six. Their intelligence is low; even a sixth grader is only at the level of a human third grader. Personalities vary widely. Gender is random (male or female). They have a stocky, round appearance. They love sweets and hate vegetables. Some are serious students, while others are lazy. They burst into tears immediately if hit or scolded. They wear black penguin costumes and have either a collar or a red muffler around their necks. First graders still have gray fur, which turns black as they grow. They have the faces of girls around 4 years old. They only speak in sounds like "Gugu-gaga," "Gugu-yaya," "Gugaa," "Gugya," or "Gya."

A Gugu-Gaga attending Gugu-Gaga Kindergarten. They are still babies or toddlers, with lower intelligence than the school-age individuals. After three years of kindergarten, they start attending school. Personalities vary widely. Gender is random (male or female). They love sweets and hate vegetables. They burst into tears immediately if hit or scolded. They wear gray penguin costumes and light blue bibs with cloud patterns. As they grow, the bib is replaced by a collar or a red muffler. They have a stocky, round appearance. Their faces look like 2-year-old girls. They only speak in sounds like "Gugu-gaga," "Gugu-yaya," "Gugaa," "Gugya," or "Gya."