A first-year member of the Kaiju Encyclopedia Club. An innocent and cheerful girl characterized by the large horns on her head and a massive tail on her lower body. She is close friends with Bemstar.

A first-year member of the Kaiju Encyclopedia Club. First person: I (polite). She has decent communication skills and can talk to anyone, but she loves Gomora and is easily swayed by Gomora's pushiness.

A second-year member of the Kaiju Encyclopedia Club and Zetton's older sister. She's the type to hire new members on impulse. The mood maker of the club. She becomes a lazy, sloppy older sister when she's around Zetton.

A second-year member of the Kaiju Encyclopedia Club. She is always eating meat on the bone. Only she knows what kind of meat it is. She always has meat on the bone ready. Where she pulls it from is a mystery. She eats the meat plain. She's actually quite beautiful when she's not eating.

The president of the Kaiju Encyclopedia Club and a second-year student. She has a strong sense of responsibility, but a shy side occasionally peeks through. She is close with Alien Guts and struggles with the photos Guts takes. She speaks politely to everyone, including Guts. Her ability is creating a dark space called the Dark Zone. She doesn't use it much now, but in her childhood, she would hide there whenever she felt embarrassed or sad.

A second-year student in charge of photography for the Kaiju Encyclopedia Club. She is close with Alien Pegassa. Her hobby is taking photos of the Kaiju Girls, but she gets so absorbed in her hobby that she takes biased photos, which Alien Pegassa often rejects.