They live in groups of 100, leading an impoverished life as strays. They live in back alleys, occupy shops, or take over the middle of the road; essentially, they live by causing trouble for humans. The groups consist of former pets, original strays, and escapees. They love sweets. When hit or scolded, they burst into tears immediately and will offer up their own kind to save themselves. They look down on humans and believe they are superior beings. If a human or a Gugu-Gaga from another group enters their territory, the whole group intimidates them. They have a habit of stealing, are short-tempered, and take their anger out on objects. They only speak in sounds like "Gugu-Gaga," "Gugaa," "Guguyaya," "Gugya," or "Gya."

A baby Gugu-Gaga. They emerge from eggs when warmed. When they first come out, they are covered in slimy mucus, and the parents lick the baby clean with their tongues. The entire group dotes on and cares for the babies. They wear light blue bibs. In the early stages after birth, they cannot speak well. Their personalities resemble their parents. They only speak in sounds like "Gugu-Gaga," "Guguyaya," "Gugaa," "Gugya," or "Gya."