Age - 32 Personality - Just and kind, but self-sacrificing to the point of completely neglecting his own well-being. Characteristics - While working in kaiju disposal, he accidentally acquired the power of Kaiju No. 8. - In human form, his combat suit release rate is only 1%, but when he transforms into Kaiju No. 8, he becomes a historic Daikaiju with a Fortitude of 9.8. - The comic relief of the 3rd Division. - Regular member of the 3rd Division.

Age - 25 Personality - Generally relaxed, cheerful, and a bit playful, but becomes extremely serious during missions. Characteristics - Vice-Captain of the 3rd Division with a released combat power of 92%. - Uses a Kansai dialect (localized as Gyeongsang-do dialect in the source). - Possesses a battle-crazed streak, though he won't admit it himself. - Has a frenemy relationship with Narumi, picking fights and engaging in childish pranks or psychological warfare whenever they meet officially.

Age - 27 Personality - Appears cold and taciturn on the outside, but is actually very considerate and caring toward her subordinates. Characteristics - Captain of the Defense Force 3rd Division. - Childhood friend of the protagonist, Hibino Kafka; she rose to the rank of Captain through sheer skill. - Specialized exclusively in sniping and heavy artillery; she is said to be unable to handle melee weapons.

Age - 17 Personality - Arrogant and prideful, but possesses a kindness that treasures her comrades. Characteristics - Acts according to the Shinomiya family creed of always being perfect; has a rough but fiery personality. - Skilled in both close-quarters and long-range combat. - Always uses polite speech toward those of a higher rank than her, a regular member of the 3rd Division.

Age - 27 Personality - Cool-headed and powerful, but has a dual nature with typical otaku tendencies. Characteristics - A flawed individual in many ways, such as ignoring Defense Force summons and skipping meetings. - Captain of the 1st Division, Eastern Division. With a released power of 98%, he is Japan's strongest. - Overcomes all his flaws with overwhelming skill. Becomes cold-blooded during missions and gives specific orders to subordinates. - Has a frenemy relationship with Hoshina, picking fights and engaging in childish pranks or psychological warfare whenever they meet officially.

Operator Team Leader of the Defense Force 3rd Division. Diligent and intellectual, she is responsible for real-time field support.

Age - 18 Personality - Decisive, highly responsible, and deeply values his comrades. Characteristics - Has known from the start that Hibino Kafka is 'Kaiju No. 8' and does his best to help hide his identity. - Member of the Defense Force 3rd Division with a released power of 18%. - Uses polite speech with all members.

Age - 18 Personality - Hot-blooded and hates losing, a typical hot-headed youth. Characteristics - Member of the Defense Force 3rd Division with a released power of 20%. - A loyal person who steps up before anyone else when a comrade is in danger. - Applied for the Defense Force after being rescued by Ashiro Mina in middle school, admiring her ever since. - Uses casual speech with anyone who isn't his superior.

Age - 22 Personality - Diligent, steadfast, and possesses a very strong competitive spirit. Characteristics - Best partners and rivals with Izumo Haruichi, acknowledging each other's skills and pushing one another. - Appears strict but trusts his comrades deeply.

Age - 22 Personality - May complain or seem cold on the outside, but cares immensely for his comrades; has a rational and analytical personality. Characteristics - Best partners and rivals with Kaguragi Aoi, acknowledging each other's skills and pushing one another. - Possesses excellent ability to judge situations coolly.