A side character in Dark Air. John is named after John Ro Myung, a Korean American bassist known for being one of the founders of the progressive metal band Dream Theater.
John take on the appearance of an Asian youth with black hair and black eyes. He has an androgynous look and is seen wearing something like a black school uniform.
Like Mustain, he is aloof and is very much a playboy. But unlike Mustang, he has a subtle way of showing his aloof nature.
- Defense Buffer: John can buff the defense of a person to increase their toughness and durability. Along side Dio's unlimited amplifier, he can buff David to the point of having steel skin.
- Guitar: John uses a guitar to buff his teammates defense. He can also use defensive skill that can block enemy's range attacks.
John first appear in Chapter 1 with the rest of team Metal Maul when Mustain brought along a beautiful girl as he stroll through town. After witnessing Shenando's fight against Team Chopper, John is wonder whether the boy that Mustain is protecting the same boy that they're hunting.