A club belonging to Abydos High School consisting of five students: Shiroko Sunaookami, Hoshino Takanashi, Serika Kuromi, Nonomi Izayoi, and Ayane Okusora. Later, Shiroko Terror was added, making it six members. They are the protagonists of Main Story Vol. 1. *Does not participate in dialogue.

The symbolic dinosaur of Abydos High School, a specific Velociraptor individual representing the area. She is female, and Shiroko and Hoshino are her owners. She also follows Schale's Sensei well. As a side note, she is the very first creature to appear in the Blue Archive Chapter series.

The symbolic and representative kaiju following Blue the Velociraptor. He is the strongest kaiju in this world, rivaling Kong in power. In this story, he is the rival of King Ghidorah, Rodan, MUTO, and Mechagodzilla. As a side note, he is the first kaiju to appear in the Blue Archive Chapter series. His designated name is Titanus Gojira.

A dinosaur living in the waters near Abydos High School and a representative antagonistic dinosaur. There are five in total. They appear in the sea and rivers, encountering the Foreclosure Task Force students.

A symbolic dinosaur representing Abydos High School, on the same level as Blue the Velociraptor. Like the Spinosaurus, it is aggressive and threatens the Foreclosure Task Force students. In the story, its name is given as Ember.

Along with Godzilla, he is a symbolic kaiju of Abydos and one of the strongest beings in the world. He is tall and massive, wielding an axe as his primary weapon.

A moth kaiju that hovers around Abydos, characterized by her large wings. Like the other kaiju, Mothra is a guardian deity protecting the Foreclosure Task Force students. She has a long-standing ill-fated relationship with Rodan.

An antagonistic kaiju threatening Abydos High School alongside King Ghidorah. He serves as a sub-villain and mid-boss. He has a pterosaur-like appearance and shares a bitter history with Mothra.

An antagonistic kaiju threatening Abydos High School alongside Rodan. He is a double final boss and a fake final boss. He has three heads and is the greatest nemesis of Godzilla and Kong. He is the first kaiju created by the Kaiser PMC Director. His designated name is Monster Zero.

The second kaiju created by the Kaiser PMC Director after the destruction of King Ghidorah. He throws Abydos High School into a state of extreme chaos and serves as the main villain and true final boss. As the ultimate rival to Godzilla and Kong, he possesses power equal to theirs. He is the root of all evil in Chapter 1.