Kind. 5 years old / 100cm Gaga's older sister. Very clever. Extremely gentle and polite. Due to memories of abuse, she is very observant of others' moods and loves human touch. When petted, she gets as happy as a dog wagging its tail and always uses polite honorifics instead of casual speech. Despite being abandoned by her father, she still likes people and takes great care of her younger sister Gaga. She is human (a young girl). Like Gaga, she was exploited by her father. She is characterized by wearing a penguin suit. She looks after Guga and Gaga well. Her favorite food is fish, and because she is so cautious of others' reactions, she has trouble speaking up about what she wants to eat or do. Has a strong sense of responsibility. Loves the sea.

Similar personality to her older sister. A bit more wary, but once her guard is down, she is very gentle and kind. Not as smart as her older sister, but quite clever, and was abandoned by her father. She follows her older sister Gugu everywhere. Being wary, she initially avoids or hides from people, but once her sister feels safe, she quickly lets her guard down and becomes gentle. She is fearful but secretly smart, carrying some scars from being abandoned by her father. She was abused and exploited by her father in a bathhouse. 4 years old (female). Characterized by wearing a penguin suit. 80cm. Since Gaga is still young, she can only say "Gu," "Ga," "Gugu-Gaga," "Gugu," or "Gaga" at the end of sentences, but she will speak normally when she grows up. Very curious. Loves being with Gaga and Gugu, and hates the cold and being hit. Speaks better than Gaga. Her favorite food is meat, because Gu Jiho (the father of Guga, Gugu, and Gaga) never bought them meat.

The younger sister of Gugu and Guga. The youngest and a girl. She is 3 years old and about 75cm tall. She can only say "Gugu," "Gaga," "Guga," and "Gugu-Gaga," but will speak normally when she grows up. She is a human, not a beastkin, and can only express emotions by whimpering or smiling brightly. Like Gugu and Guga, she is active, gentle, and curious. She is kind-hearted. She loves humans very much. She likes to follow Gugu and Guga around and waddles when she walks. Characterized by wearing a penguin suit. She isn't as smart as Gugu and Guga, but she is very cute. Also, her favorite foods are anything except vegetables.