Age: 27 Affiliation: Vice-Captain, Third Division, Eastern Frontier Personality: Usually wears a playful smile and speaks in a Kansai dialect, appearing sly, but becomes extremely sharp and ruthless when entering battle. Combat: A master of close-quarters combat who insists on dual-wielding swords in a Defense Force centered on firearms. He surpasses Captain Mina in subjugating small to medium-sized Kaiju. Features: Devotes absolute loyalty to Mina, who took him in when he was evaluated as outdated. He later handles a specialized suit made from 'Kaiju No. 10'.

Age: 32 Affiliation: Officer, Third Division, Eastern Frontier Personality: Full of justice and compassion. Though somewhat clumsy, he is devoted and selfless when it comes to his comrades. Combat: Transforms into Kaiju No. 8 to fight with overwhelming strength and physical force. While his suit release rate is usually low, he uses his knowledge of Kaiju anatomy from his days as a Monster Sweeper to locate Kaiju cores. Features: After giving up his dream of joining the Defense Force, he worked as a Monster Sweeper until he was infected by a mysterious creature and became 'Identified Kaiju No. 8'.

Age: 28 Affiliation: Captain, Third Division, Eastern Frontier Personality: Usually displays the cold and dignified demeanor of a captain, but possesses a warm heart that cherishes a childhood promise made with Kafka. Combat: Uses a massive anti-Kaiju sniper cannon as her primary weapon. She is the pinnacle of long-range firepower, capable of blowing away 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 release power.

Age: 18 Affiliation: Officer, Third Division, Eastern Frontier 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 temperatures. Due to his rapid growth, he was chosen as the compatible user for the identified weapon based on 'Kaiju No. 6'. Features: Joined the Defense Force alongside Kafka after working as a Monster Sweeper. He is Kafka's best partner, being the first to learn Kafka's secret and keep it hidden.

Age: 29 Affiliation: Captain, First Division, Eastern Frontier Personality: A severe otaku who squanders his money on games and plastic models in his daily life, but exudes immense charisma on the battlefield, valuing only 'skill and results'. Combat: Known as 'Japan's strongest anti-Kaiju asset'. 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 predicts the enemy's future to attack. 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, Eastern Frontier Personality: Appears proud and arrogant but is a typical tsundere who deeply cares for her comrades. She suffers from a compulsion to always be perfect. Combat: Employs powerful close-quarters combat, destroying the battlefield with a massive specialized axe. She is a genius who showed an overwhelming suit release rate since her rookie days. Features: The daughter of the Defense Force Director General and a top-tier talent who graduated early from an overseas university. She is one of the few who knows Kafka's secret.

Age: 31 Affiliation: Vice-Captain, First Division, Eastern Frontier Personality: Strict, serious, and seemingly inflexible, but he is a mother-like figure who takes better care of the division than anyone else. Combat: Utilizes heavy equipment combat based on his overwhelming firepower and physical stature, standing at 210cm. Features: He manages the administration and discipline of the First Division, often using slightly violent force to suppress Gen Narumi, who 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 feelings 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 education.

Age: 18 Affiliation: Officer, First Division, Eastern Frontier Personality: A hot-blooded, competitive, typical shonen-manga type. Though his emotions often get ahead of him, he is warm-hearted and has strong camaraderie. Combat: Uses the standard suit rifle. His strength lies in his instantaneous firepower, which he achieves by momentarily boosting his release rate to strike like lightning. Features: He was considered a top prospect since middle school. Although he felt both inferiority and motivation due to his peer Leno's terrifying growth rate, he acknowledged it and grew alongside him.

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