- A massive kaiju with a pair of horns and multiple eyes in pattern-like areas. Isao mentions that Narumi's eyes are currently the oldest kaiju identification weapon in Japan, Rt-001, made from No. 1's retinas. It was a kaiju that could visualize electrical signals sent from the brain to attack the next point of movement, making its strikes impossible to evade. It can also visualize the electrical signals of multiple kaiju. Currently transformed into a young boy, he has pink hair and pink eyes. He appears to be about 3 years old.

- A prototype Daikaiju created by Kaiju No. 9. Its appearance is that of a muscular humanoid kaiju. It is a one-dimensional battle maniac who enjoys fighting strong opponents and pursues strength, viewing others solely as targets for combat and possessing almost no sense of camaraderie. It seeks to hunt and consume the strong to further increase its own power. Now transformed into a young boy, he has red hair and blue eyes. He is about 1 year old.

- Captain of the 1st Division of the Eastern Division. His hobbies are gaming and plastic models. He rarely leaves the captain's office, ignores Defense Force meetings and summons, but becomes cold-blooded during missions and gives specific orders to his subordinates. He has bangs that cover his eyes with pink tips and pink eyes. Weapon Numbers 1 & RT-0001 He wears a suit based on the corpse of Kaiju No. 1 and lenses based on No. 1's retinas. He senses movements before the target acts to deliver unavoidable attacks. GS-3305 A bayonet larger than Narumi himself, featuring a blade that burns the cross-section of what it cuts.

- Vice-Captain of the 3rd Division of the Eastern Division. A member of the Hoshina family, a kaiju extermination clan since the Muromachi period, and the younger brother of Soichiro Hoshina of the 6th Division. He primarily uses swords and Hoshina-style extermination techniques; his release rate was 92% in the early stages of the story, which Kafka described as not being human movement. He has a battle-maniac streak he isn't aware of. He speaks in a dialect and has purple bowl-cut hair with reddish-brown squinted eyes. Weapon Numbers 10 Kaiju No. 10 volunteered to be weaponized into a suit. Maximum power can only be achieved when his will aligns with No. 10's. SW-2033 Dual-wielded swords, his primary weapons. Multiple backups exist.