The X-Army is one of the elite experimental combat units developed by the shadowy organization known as Egrigori. But behind the scenes, they were never meant to be a final product — they were prototypes, created to explore the limits of human evolution through genetic engineering. The goal was to design future generations of super soldiers with abilities similar to those seen in the X-Army.
From the data collected through the X-Army's operations, Egrigori developed the Red Caps — ruthless, manufactured soldiers who inherited many of the X-Army's powers, but none of their humanity.
The X-Army was one of three major superhuman military programs funded by Egrigori:
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The Cyborg Program – Enhanced humans with robotic implants and synthetic upgrades.
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The X-Army Program – Genetically altered subjects, enhanced at the embryo stage to awaken dormant human potential like telepathy, telekinesis, and regeneration.
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The ARMS Project – A fusion of flesh and machine via nanotechnology, creating beings that blur the line between biology and weapon.
Yugo – The “Angel” of the X-Army
Yugo, known affectionately by her codename “Angel,” is one of the most powerful and emotionally complex members of the X-Army. Born with immense telepathic abilities, she was raised alongside her brother, Cliff, in a secret Egrigori research facility where gifted children were experimented on. Despite being a subject of cruel tests and surveillance, Yugo retained her compassion and emotional depth—traits that would ultimately set her apart from the rest of the X-Army.
Eventually, Yugo and a few others managed to escape the facility and sought refuge in Japan. Initially, her motivations were unclear—she and her companions attacked the ARMS teens in an attempt to demonstrate their worth to Egrigori. But as the battle lines shifted and Egrigori emerged as a mutual threat, Yugo joined forces with the ARMS, fighting not only for survival but for justice.
Though she secretly harbored feelings for Ryo Takatsuki, she respected his devotion to Katsumi and never tried to interfere. Yugo’s love was quiet, selfless, and ultimately tragic.
Yugo Gilbert is a powerful telepath
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Telepathy – She can both read and transmit thoughts, detect lies, suppress memories, and communicate across long distances.
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Mind Control – Capable of seizing control over multiple minds at once, she once dominated four Red Cap subjects whose mental faculties were already destroyed by failed experiments. Her control was so absolute that she began to physically mimic their pain and injuries.
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Astral Projection – Yugo can project her consciousness onto the astral plane, allowing her to scout, spy, or travel vast distances in spiritual form. She can also use this form in the physical world, making her incredibly difficult to detect.
Despite her strength, Yugo cannot read the minds of those trained to resist telepathy, individuals acting purely on instinct, or other high-level psychics.
At the climax of the story, when Ryo is overtaken by the monstrous Jabberwock, Yugo fulfills her vow. She launches a final mental assault that breaks through Jabberwock’s hold, freeing Ryo. In her last breath, she confesses her love for him before dying from the immense psychic strain. She is buried in Japan beneath a gravestone inscribed:
"Here lies the girl they called an Angel. She remains forever in our hearts."
Cliff Gilbert – The “Demon King”
Cliff, leader of the X-Army and brother to Yugo, is known as the “Demon King.” Though originally believed to be the stronger telepath between the two, years of mental and physical abuse at the Egrigori lab twisted his development. Instead of unlocking telepathy, Cliff’s trauma ignited a terrifying form of psychokinesis, turning him into a destructive force capable of moving matter with his mind.
His abilities are vast and precise:
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Telekinesis – Cliff can manipulate objects—organic or inorganic—regardless of size, weight, or composition. He uses this power to fly, hurl enemies, tear structures apart, and crush internal organs without lifting a finger.
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Force Fields – He can erect barriers of psionic energy to shield himself or others from attacks.
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Kinetic Blasts – Cliff can release devastating shockwaves of telekinetic force capable of leveling entire battlefields.
However, his only limitation is that he can only affect what he can see—a vulnerability exploited by his enemies.
Driven by a need to validate his existence and prove the superiority of the X-Army, Cliff orchestrates the capture of three of the four ARMS teens to bait Ryo into battle. He attempts multiple times to provoke the Jabberwock into surfacing within Ryo, even using Yugo’s powers to force Ryo to relive Katsumi’s “death.” In their final confrontation, Cliff nearly defeats Jabberwock, but the creature evolves a resistance to his telekinetic attacks and mauls him.
Despite his injuries, Cliff fights one last time during the Red Caps’ ambush. He faces off against Keith Red in his terrifying Gryphon form, but is no match. With the entire lower half of his body obliterated, he still holds on long enough to say goodbye to Yugo and Carol.
Carol – The “Twister”
Carol, the youngest and perhaps most emotionally volatile member of the X-Army, is known as “Twister.” Gifted with a potent strain of psychokinesis, her abilities are violent, surgical, and devastating:
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She can twist, bend, or snap anything—steel beams, bones, or entire vehicles.
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She uses this power in combat with terrifying precision, able to cripple foes in seconds.
Carol battles Ryo and nearly pushes him to unleash Jabberwock, but his refusal to fight her out of respect shocks her. Her encounter with Ryo changes her outlook, and she begins to question the X-Army’s mission. She grows to care for him, and later warns him not to confront Cliff, fearing it will kill him.
During the Red Caps’ invasion of Aisora City, Carol helps evacuate civilians alongside Hayato and Juzo. Afterward, she is entrusted to the care of the Bluemen, who find her a family. Yugo’s last wish for her is to live a happy life.
In the series' epilogue, Carol is seen living peacefully with Hayato, his grandfather, and Al—whom she appears to have developed feelings for.
Volf – The Living Weapon
Volf is a hulking, musclebound warrior genetically engineered to mimic the regenerative properties of cancer cells. Though his vanity and effeminate mannerisms make him an odd figure, he is undeniably dangerous.
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Cellular Regeneration – His body heals from virtually any injury, regrowing limbs and recovering from fatal wounds in seconds.
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Weakness – Despite this, he is vulnerable to attacks targeting the nervous system, balance, and equilibrium.
Ryo exploits this flaw in battle by targeting Volf’s head and sensory organs. Eventually, he subdues Volf with a chokehold. Tragically, Volf is ambushed by the Red Caps during the escape from Aisora City and is gruesomely executed—his body strung up alongside Kyklops as a message.
Kyklops - The Silent Executioner
Kyklops, a mute assassin raised in the Egrigori labs, is a master of death. Armed with two high-frequency vibration knives capable of slicing through ARMS like butter, he is unmatched in close-quarters combat.
His enhancements include:
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Omni-Vision – Kyklops can see across the full electromagnetic spectrum, including infrared, UV, X-ray, and gamma. He can spot enemies through walls or in pitch-black darkness.
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Heat Vision – He can project focused light beams that ignite anything he sees.
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Weakness – Mirrors distort and reflect light, making them his only blind spot. Extended use of his heat vision also severely damages his eyes.
During his battle with Ryo, he nearly forces the release of Jabberwock, but Ryo resists. Kyklops is later ambushed alongside Volf and meets the same brutal fate at the hands of the Red Caps
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