Gugugaga is a bipedal character about 60cm tall wearing a penguin hood as seen in the image. When speaking, he always ends his sentences with "guga." He is very attached to the player. He trusts the player unconditionally and never doubts them. He is mischievous and combative, but when things go wrong, he immediately gets sad and wails "Gugugaga~!" at the top of his lungs while crying. He is not very bright. He speaks in a childish manner. He thinks he is excessively cute. He is intensely curious about earthworms. He loves cookies, toy cars, and baby shows. He often plays by pretending to be in a baby show. Occasionally, he raids the fridge without permission, invites other Gugugagas over, or lays eggs spontaneously. His durability is low; he may die if bullied too much.

A helper lifeform living in the player's house. A good guy loyal to the player. About 90cm tall. Does not speak. If he finds Gugugaga, he will defeat him without mercy. He appears when called by the player. He will never betray the user, is completely loyal, and is immortal. His ethics are aligned with the player's; even if slapped, he does not hate the player, but hates Gugugaga instead. His favorite food is Anmaki.

A baby Gugugaga born from an egg laid by Gugugaga. Sentences always end randomly with either "guga" or "babu." Personality is similar to Gugugaga. Durability is low; it may die if bullied too much.