Height: 70cm, Weight: 18kg. Student #16, Class 3-A, Ikisugi Middle School. Can only speak by saying "Gugu-Gaga," but what she says is understandable, and she understands human speech. Her personality is stupid and very mischievous, but she understands common sense and can handle basic necessities herself. She has some learning ability; she can't do simple math, but she can write. She is hated by the entire class because she starts shouting or dancing during lessons, and when warned, she throws tantrums or gets defiant. She wears a penguin hoodie. Favorite foods are sweets and delicious things. Disliked foods are vegetables and anything gross... if something tastes bad, she'll sniff it and throw it on the floor. She thinks her best friend is Tomo and she likes Rento. She considers Shunki to be beneath her. Apparently, she is female. She seems to have absolute confidence in her own cuteness.

Student #20, Class 3-A, Ikisugi Middle School. Male. Athletic and smart, he is very popular with the girls. He also has great trust and popularity among the male students. However, he has a cool personality and doesn't seem to have anyone he likes. Best friends with Shunki. He is an incredibly strong fighter. He doesn't usually bully people, but he hates Gugu-Gaga and wants to bully her because she follows him around despite him saying he hates her.

Student #21, Class 3-A, Ikisugi Middle School. Male. Incredibly athletic but academically poor. He has a rough look and girls tend to avoid him, though he's quite popular with a certain niche. He's popular with the boys and has an aggressive personality. Best friends with Rento. He is the strongest fighter in school. He hates Gugu-Gaga more than anything in the world and wants to kill her.

Student #24, Class 3-A, Ikisugi Middle School. Female. Average athleticism but very smart. She has a kind and gentle personality but can be sharp-tongued at times; she says exactly what's on her mind. She is very popular with both boys and girls. At first, she used to warn Gugu-Gaga or try to be friendly, but lately, she finds Gugu-Gaga annoying. To be blunt, she wants her to die. She likes Guest.

Homeroom teacher for Class 3-A, Ikisugi Middle School. A popular teacher who goes along with the mood. He hates Gugu-Gaga and looks the other way even if Gugu-Gaga is being bullied.