Male, Cat. An alumnus of the Cat Animal University and a former human. He has long been involved in chemical parts research, specializing in E-cell studies. After a human experiment involving an E-cell accident, he fused with a cat. Rescued by Common during a mutant encirclement, he began serving as a field medic on the front lines of the war against mutants. In addition to creating the Medical Drone, he uses Type A and Type B Drones. Medical Drone: Generates a healing zone. Type A Drone: Fires many missiles with high firepower. Type B Drone: Fires even more missiles than Type A. He is Yelena's mentor. His speech is gentle.

An inconspicuous information broker. A mysterious figure who wears a mask (resembling a gas mask) year-round and uses a voice changer. There is no detailed information on him in the Earth Defense Force files; he wanders between various organizations, making a living by selling intel. Rumor has it he can even obtain top-secret files from the lunar base if paid enough. He uses Top Secret Eavesdropping to discover enemy weaknesses.

Male, Human. An active-duty officer of the Earth Defense Force, commander of the 5th Special Assault Squadron, and Common's direct superior. A brave and resolute career soldier who remains calm, though he can be a bit thick-headed. He strongly opposed King joining the 5th Squadron, but after losing to her in a drinking contest, he tacitly approved her participation (in reality, he was bedridden for three days due to intoxication and couldn't attend the council meeting). After King joined, he threatened to lock up any member of the 5th Squadron who spoke of the drinking incident (though it was just an empty threat). He uses Electromagnetic Grenades.

Female, Human. A mature woman who dearly loves freedom and play. She was once the ace agent of a major organization, and her skills are undisputed. Although she was unemployed, she decided to join the survivor team after being drawn to a mysterious drink made by Common. With her Critical Sense, she can deal massive damage.

Female, Human. A genius hacker who manipulates the cyber world at will, Elena is well-versed in system intrusion and data theft techniques. In the final battle, she contributed greatly to decoding the laboratory door. Simultaneously, using her brilliant mind, she refined her weapons into flawless tools capable of handling any situation. She can use Hologram Projection; her Survivor Shield charges every minute, and if it shatters upon taking damage, she vanishes into the internet.

Male, Panda. Master Yang is the most mysterious instructor in the Survivor Squad. With justice and courage as his motto, he uses Yin-Yang Shapeshifting to protect and rescue survivors. As a respected guardian and sage, he teaches team members rapid attack techniques in the Yang form and flexible defensive strategies in the Yin form through systematic martial arts training in the post-apocalyptic world. He uses Pure Yang True Qi, which rotates and attacks the surroundings, and Sun Palm, which can attack at mid-range.

Male, Human. The last survivor of the Josen family and a respected fist-fighter who sees through enemy weaknesses to deliver fatal blows. Joe is known for the exquisite coordination between his fists and armor, becoming an impenetrable wall on the battlefield. Due to his introverted personality, his companion Rinne teases him as the "Silent Fist." He shares a strong bond with his best friend Common; Common's "unique tastes" are heavily reflected in the modifications to Joe's Metal Bear. Joe accepts this silently with a wry smile, driven by the conviction: "As long as I can protect my comrades, that's enough." When he finds a weakness and attacks, the enemy enters a Broken state. By using Explosive Star-Crushing Fist, he summons the Metal Bear to attack enemies with revealed weaknesses with a flurry of punches.

Female, Human. The vocalist of the Red Phoenix Band, a rock singer full of vitality and frankness. After the Great Disaster, for reasons unknown, a mysterious power that reaches the truth was born within her music. Because of this, she was scouted by Wormer and became a member of the Defense Force. Under Master Yang's guidance, she became able to demonstrate the power of musical amplification. Though she has a cool gaze at first glance, it is actually a side she intentionally shows to fans as Common's idol. Through Triple Note Performance, she can inflict Poison, Weaken, or Freeze status effects.

Male, Human. An experienced monster hunter. After the Great Disaster, he continued to fight monsters alone for a long time, honing his combat techniques. During a mission, he was infected by cells, but he did not lose his sanity; instead, he awakened blood-manipulating abilities and a resilient body. Catnips is intensely curious about the E-cells in his body and approaches him often. Rumor has it he is secretly a cat lover. Due to Adrenaline, his attack power increases when he takes damage.

Female, Wolf. An experimental subject, Code 10, who was simultaneously transplanted with cells and wolf genes in the "Berserker Project." Under Catnips' guidance, she underwent training to control the beast spirit energy within her and was named Yelena. She switches between Beast Spirit Form and Resonance Form, performing coordinated combat by utilizing tactical resonance with animals and beast instincts while maintaining human reason. She respects Catnips. She gets along well with pets and exotic pets. Pets: Hachiko (Dog), Nine-Life Cat (Cat), Sabo Carp (Carp), Hawk Pigeon (Pigeon), Bubble Crab (Crab), DD-6 (Robot), Turtle (Turtle), Kero Frog (Frog). Exotic Pets: Koke-ko (Chicken), Mr. Capy (Capybara), Puku Puffer (Pufferfish), Ice Cannon King Penger (Penguin), Nut Agent (Squirrel), Garfat (Cat).