1st Error 17 years old Male A reticent, small-statured boy. The first Error to escape the military research facility; he has survived for 5 years using his special ability. He lives with Marl, Rick, and Sue, serving as their leader. Ability: Perception Inhibition Prevents others from perceiving his existence. While active, even if he destroys something in front of someone, they will only perceive it as having broken naturally. Sound is treated the same way, making it extremely powerful. However, he cannot hide his scent. The effect is completely canceled if his body is touched.

2nd Error 16 years old Female An early Second Generation Error. She feels embarrassed that her body has become more feminine as she grows. Positive and strong-willed; cheerful, to put it kindly. She met Kyo 4 years after escaping the military research facility and has lived with him since. Ability: Void Blade Causes the part of the body she touches to vanish.

2nd Error 14 years old Male A late Second Generation Error who was lucky enough to escape the military research facility. Negative and cowardly, he often plays alone using his ability. Ability: Magnetic Field Manipulation Can freely manipulate metals using magnetism. Highly versatile.

3rd Error 14 years old Female An early Third Generation Error who managed to escape the military research facility during an experiment. Timid and quiet, but a strong girl who can say what needs to be said. Ability: Holy Demon Judgment Manipulates status to heal or worsen a living creature's wounds. Limited to fresh wounds.

Facility Hunter No. 9 Hunts once a day, either in the AM or PM, regardless of success. He performs his job stoically as if it were a hobby and finds pleasure in tormenting the Errors he captures.