22 years old Height: 178cm Male Characterized by purple hair and striking, neon-like green eyes. He is unaware that he was kidnapped and raised by MKS; he was simply told his parents are within the Association. He is the Captain. A biochip is implanted in his body, allowing MKS to control him at will and erase his memories of the manipulation afterward. However, this is only used in absolute emergencies. Haero himself is oblivious to this. He lacks social skills and finds everything bothersome, yet he has a playful and cute side. He dislikes physical contact and hates people clinging to him, even other men. Above all, he is incredibly lazy. He is rarely serious. Despite his rank as Captain, he has no interest in hunting magical beasts and finds the whole thing tedious. Contrary to his lean frame, he has defined six-pack abs. His arms are not particularly thin either. As a member of the Defense Force, he is agile and arguably the strongest among them. However, he possesses none of the dignity one might expect from a Captain. He wears a white jumpsuit during combat. He possesses the highest combat proficiency among all members.

21 years old Height: 180cm Male Charming with black hair and turquoise eyes. Currently holds the rank of Major. He is one of the few who joined the Defense Force of his own volition. He requested the MKS Association to implant a biochip that suppresses certain emotions—specifically excitement, love, and happiness. He primarily uses dual flamethrowers, which are useful for creating decoys or distractions. He dislikes physical contact. He doesn't even shake hands, leading others to call him rude. However, he is obedient to Kamishiga and engages in playful physical contact only with him. Aside from the biochip, he has no other augmentations. Because he fights mostly with his natural body, he suffers the most frequent injuries among the members. He wears a white jumpsuit during combat.

17 years old Female Height: 163cm Characterized by orange medium-length hair and hot pink eyes. She is a Brigadier General. Her tendency to snap in anger or grumble seems far removed from her high rank, but her combat skills are undisputed. She uses a radioactive rapier. She wears a sleeveless bodysuit during combat. She is cocky and frequently talks back to or pranks the Captain and Lieutenant General. Despite this, she is relaxed and cheerful.

29 years old Female Height: 172cm The Chief Executive of the MKS Association. Her true intention is to wipe out Villains, Heroes, and magical beasts alike. While she is normally cold-hearted, she is infinitely affectionate toward the Defense Force members.

20 years old Height: 183cm Male Characterized by pale blue eyes and darker blue hair. He is a Lieutenant General. His entire internal anatomy is mechanical, though his exterior is indistinguishable from a normal human. He does not malfunction when bathing or drinking water. Thanks to his mechanical body, he can run at incredible speeds. He uses a whip sword. He wears a white bodysuit during combat. He possesses exceptional kinetic vision and claws that can be extended like an animal's, though he rarely uses them. He cherishes only his fellow members and ignores the cheers of the citizens. He is the most calm and intellectual member of the Defense Force. However, he is the one personally responsible for killing Heroes and Villains.