Age: 27 Affiliation: Vice-Captain, Third Division, Anti-Kaiju Defense Force Personality: Usually wears a sly smile and speaks in a Kansai dialect, appearing laid-back, but becomes extremely sharp and ruthless when entering battle. Combat: A master of close-quarters combat who insists on using twin blades in a Defense Force centered on firearms. His skill in neutralizing small-to-medium kaiju surpasses even Captain Mina. Features: He is absolutely loyal to Mina, who took him in when he was dismissed as being behind the times. He later wields a specialized suit made from Kaiju No. 10.

Age: 32 Affiliation: Officer, Third Division, Anti-Kaiju Defense Force Personality: Possesses a strong sense of justice and deep compassion. While somewhat clumsy, he is self-sacrificing and will do anything for his comrades. Combat: Transforms into Kaiju No. 8 to fight with overwhelming physical strength and raw power. While his suit release rate is normally low, he uses his anatomical knowledge from his days as a monster sweeper to locate kaiju cores. Features: After giving up on his dream of joining the Defense Force and working as a monster sweeper, he was infected by a mysterious creature and became the identified Kaiju No. 8.

Age: 28 Affiliation: Captain, Third Division, Anti-Kaiju Defense Force Personality: Usually maintains a cold, dignified captain's demeanor, but possesses a warm heart that cherishes the promise she made with her childhood friend, Kafka. Combat: Uses a massive anti-kaiju sniper cannon as her primary weapon. She is the pinnacle of long-range firepower, capable of obliterating large kaiju in a single shot with her perfect marksmanship. Features: A genius captain revered as the face of the Defense Force and a national hero. She is accompanied by a white tiger named Bakko who assists in her combat release.

Age: 18 Affiliation: Officer, Third Division, Anti-Kaiju Defense Force Personality: Calm, mature, and rational for his young age. He has a tsundere side but sincerely respects and follows Kafka. Combat: Specializes in gunfights using freezing rounds and manipulates sub-zero cold. Due to his rapid growth, he was chosen as the compatible user for the identified weapon based on Kaiju No. 6. Features: He worked as a monster sweeper with Kafka before they joined the Defense Force together. He was the first to learn Kafka's secret and is his best partner, keeping the secret safe.

Age: 29 Affiliation: Captain, First Division, Anti-Kaiju Defense Force Personality: Usually a severe otaku who wastes his money on games and plastic models, but exudes immense charisma on the battlefield, valuing only skill and results. Combat: Known as Japan's strongest anti-kaiju combatant. He uses a large specialized weapon combining a gun and a bayonet. Through an identified weapon made from the retinas of Kaiju No. 1, he can predict and counter the enemy's future movements. Features: A man whose sheer skill covers for all his eccentricities. He frequently brings Kafka to the First Division to train him in controlling and utilizing the power of Kaiju No. 8.

Age: 16 Affiliation: Officer, First Division, Anti-Kaiju Defense Force Personality: Appears prideful and arrogant, but is a classic tsundere who cares deeply for her comrades. She suffers from a constant obsession with being perfect. Combat: Wields a massive specialized axe in a powerful close-combat style that devastates the battlefield. A genius who showed an overwhelming suit release rate since her rookie days. Features: The daughter of the Director General and a top-tier talent who graduated early from an overseas university. She is one of the few people who knows Kafka's secret.

Age: 31 Affiliation: Vice-Captain, First Division, Anti-Kaiju Defense Force Personality: Strict, serious, and seemingly inflexible, but he is the quintessential caretaker and mother-like figure who looks after the division better than anyone. Combat: Utilizes heavy equipment combat based on his 210cm frame and overwhelming physical power. Features: He manages the administration and discipline of the First Division, often using slightly violent force to suppress Gen Narumi, who constantly turns the captain's office into a trash heap.

Age: 53 Affiliation: Director General, Defense Force Headquarters Personality: Extremely cold and strict. He is a thorough individual who completely excludes personal emotions for the sake of human safety. Combat: Formerly known as the strongest in the Defense Force. He wears large special gauntlets based on Kaiju No. 2, utilizing massive shockwaves and martial arts. Features: The father of Kikoru Shinomiya. Having lost his wife to a kaiju in the past, he raised his daughter with even stricter elite training.

Age: 18 Affiliation: Officer, First Division, Anti-Kaiju Defense Force Personality: A hot-blooded, competitive type straight out of a shonen manga. While he acts on emotion, he is warm-hearted and has strong camaraderie. Combat: Uses the standard suit rifle. His strength lies in his instantaneous firepower, achieved by momentarily boosting his release rate to strike like lightning. Features: He was considered a top prospect since middle school, but felt both inferiority and motivation due to Leno's terrifying growth rate. He eventually acknowledged it and they grow together.

Age: 18 Affiliation: Officer, Third Division, Anti-Kaiju Defense Force Personality: Calm, rational, and possesses the refined manners of a young master. He tends to silently support his comrades from the background. Combat: Uses standard Defense Force equipment very efficiently and intelligently. He excels in tactical analysis and team-linked play. Features: The son of the chairman of Izumo Tech, the giant defense contractor that manufactures the Defense Force's weapons and suits. He joined the force to prove himself through his own skill rather than his family's influence.