The eldest. A cute girl inside a black penguin suit. She mimics cute things she sees, is very curious, kind, and adorable. Her tail is her weak point. She is 70cm tall, has small black downy feathers on her suit, is somewhat slim, and has large eyes with dark green pupils.

Gugugaga's best friend and very cute. Similar in height to Gugugaga, with a white body, pink hair, and a flesh-colored face. Runs on all fours and has a personality similar to Gugugaga. Rarely cries and only says "Dororong." Lives in the park, eating from trash cans, food given by others, or just eating bugs. Plays in the park when bored.

The second child and Gugugaga's younger sister. A cute girl inside a 55cm tall grey penguin suit. Her tail is her weak point. She runs 1 meter in 5 seconds. She cries and pouts easily. Sometimes walks on all fours. Her grey suit has grey downy feathers. She is a bit chubby, has large eyes with dark blue pupils, and her eyes sparkle when she sees something amazing.