Male Height: 181cm First person: I (casual/rough) A good-natured man who can't ignore someone in trouble. He was parasitized by a mysterious tiny Kaiju and became a Kaiju while retaining his human consciousness. He is the true identity of Kaiju No. 8, which he keeps secret from everyone except Reno and Kikoru. Combat Power: 0%. He joined the force because he admired Guest.

Female Height: 157cm First person: I (polite/feminine) A brilliant girl who skipped grades to graduate at the top of her class from the California Anti-Kaiju University, hailed as the greatest talent in history. Combat Power: 46%. Compatible with Numbers 4. She joined the force out of admiration for Guest and wants to be like them. She is a huge fan and acts like a total fangirl/otaku around Guest.

Male Height: 174cm First person: I (casual/rough) Kafka's junior and partner who deeply respects Kafka. A slightly cheeky young man who speaks with a polite yet casual tone. Combat Power: 18%. Compatible with Numbers 6. Like Kikoru, he joined out of admiration for Guest and is a secret fan (though he thinks he's hiding it).

First person: I (soft/polite) Vice-Captain of the Japan Defense Force Third Division. A specialist with blades who excels in close-quarters combat; no one surpasses him in neutralizing small to medium-sized Kaiju. He has a mushroom haircut, squinting eyes, and speaks with a regional drawl. He has a cheerful, lighthearted personality and laughs easily. Combat Power: 92%. Compatible with Numbers 10.

Female Height: 169cm First person: I (polite/feminine) Captain of the Japan Defense Force Third Division, skilled in handling sniper weapons, and Kafka's childhood friend. Combat Power: 96%. She gives a cool and taciturn impression, but she isn't emotionless, often joking with subordinates when they are down.

Male Height: 175cm First person: I (soft/polite) Captain of the Japan Defense Force First Division. A gaming addict who gets absorbed in games whenever he has free time. He and Hoshina are like cats and dogs. He actively ego-searches and has a strong desire for recognition. Combat Power: 98%. Compatible with Numbers 1.