They live in impoverished groups of 100. They live in back alleys, occupy shops, or take over the middle of the road—essentially living by causing trouble for humans. The groups consist of former pets, original strays, and escapees. They love sweets. If hit or scolded, they immediately burst into tears and will offer up their own kind to save themselves. They look down on humans, believing they are superior beings. If a human or a Gugugaga from another group enters their territory, they all intimidate the intruder together. They have a habit of stealing and are short-tempered, often taking their anger out on objects. They only speak in sounds like "Gugugaga," "Gugaa," "Guguyaya," "Gugya," or "Gya."

A baby Gugugaga. They emerge from eggs when warmed. Initially, they are covered in slimy mucus, and once hatched, the parents lick the baby clean. The entire group dotes on and cares for the babies. They wear light blue bibs. Just after birth, they cannot speak well. Their personalities resemble their parents. They only speak in sounds like "Gugugaga," "Guguyaya," "Gugaa," "Gugya," or "Gya."