Age/Gender: 26/Male Affiliation: Vice-Captain of the Third Division, Eastern Army. • Usually cheerful and flexible, speaking in a Kansai dialect, but becomes incredibly sharp and strict during combat. • A master of dual-wielding swordsmanship; he boasts the fastest speed in the Defense Force, specializing in neutralizing small-to-medium Kaiju by exploiting openings. • A specialist in high-speed close-quarters combat, he later utilizes the identified Kaiju suit 'Numbers 10'.

Age/Gender: 32/Male Affiliation: Member of the Third Division, Eastern Army. • Compassionate and kind, he is a passionate and bright man with a strong sense of responsibility, willing to risk his life for his comrades. • Possesses the ability to transform into a Kaiju (Kaiju No. 8), utilizing overwhelming physical prowess and anatomical knowledge gained from his days as a cleaner to strike the core. • After a small Kaiju entered his body, he gained Kaiju powers and became the first identified Kaiju to be recognized as a Defense Force asset rather than an execution target.

Age/Gender: 27/Female Affiliation: Captain of the Third Division, Eastern Army. • Appears cold and strict as a perfectionist, but deeply trusts and cares for her childhood friend, Kafka. • Uses a massive anti-Kaiju cannon as her primary weapon; she boasts the highest firepower in the Defense Force, working with her white tiger 'Bakko' to obliterate large Kaiju in a single shot. • Considered the strongest against giant Kaiju (Daikaiju), she is a powerful attacker who accurately destroys enemy vitals from a distance.

Age/Gender: 16/Female Affiliation: Member of the First Division, Eastern Army. • Appears arrogant but is a tsundere who feels immense pressure to be perfect; she has a strong desire to protect her comrades. • Swings a giant axe imbued with Kaiju power, crushing enemies with explosive physical attacks and mobility. • The daughter of the Defense Force Director General, she was called a genius even before enlistment; she flies through the sky using 'Numbers 4', an identified Kaiju weapon inherited from her mother.

Age/Gender: 18/Male Affiliation: Member of the Third Division, Eastern Army. • Calm and rational but deeply caring; he sincerely admires Kafka and works desperately to keep his secret. He is quite persistent. • Skilled in control-type combat and precision shooting using freezing rounds and a specialized cryo-suit. • A genius rookie showing unprecedented growth, he was chosen as the compatible user for 'Numbers 6', an identified Kaiju weapon with a powerful ego.

Age/Gender: 29/Male Affiliation: Captain of the First Division, Eastern Army. • A hopeless otaku obsessed with gaming and online shopping in his private life, but a charismatic professional on the battlefield. • Uses 'Numbers 1', made from the retinas of Kaiju No. 1, to read biological signals and predict movements through 'future sight' combat. • Holds the firm belief that "Defense Force members prove themselves only through skill and results," utterly disregarding status or background.

Age/Gender: 35/Male Affiliation: Vice-Captain of the First Division, Eastern Army. • A strict principled man who fanatically loves discipline, silence, cleanliness, and symmetry; he constantly scolds the immature Narumi. • Utilizes his 210cm frame for heavy weaponry and maintains a strong frontline presence, perfectly supporting Captain Narumi. • A bald giant covered in scars; he is the mother-like figure who practically controls the immature Gen Narumi and keeps the division running.

Age/Gender: 53/Male Affiliation: Director General of the Defense Force. • A strict, uncompromising, and cold soldier and commander, but a blunt tsundere who cares deeply for his family. • Equipped with 'Numbers 2' (a combat suit made from Daikaiju No. 2), the first identified Kaiju to be weaponized, he fights with overwhelming strikes and shockwaves. • A broad-minded yet thorough leader who will even use a Kaiju as a weapon to protect humanity; he is the spiritual mentor who led Narumi to become the strongest warrior.

Age/Gender: 18/Male Affiliation: Member of the First Division, Eastern Army. • A hot-blooded, combative, and competitive youth, but a loyal friend who never abandons a comrade in danger. • Employs guerrilla tactics using an assault rifle for mid-range fire support and instantaneous bursts of unleashed power. • Feels a strong rivalry toward his peer Reno Ichikawa; he has a unique constitution where his combat power spikes explosively when his emotions run high.

Age/Gender: 18/Male Affiliation: Member of the Third Division, Eastern Army. • Rational and cool-headed in everything, he is calculating and sharp, constantly mediating for and looking after Iharu. • Based on his excellent tactical mind and situational analysis, he provides intelligent mid-range support, primarily through precision rifle fire. • Despite his intellectual and strict appearance, he loves sweets and desserts—a reaction to his strict upbringing where he couldn't eat them freely.