Gas are based on moths, They have blue robotic bodies with a pair of black eyes and small yellow wings.
Gas only appear in Collision Chaos and are similar to Pata-Batas. They fly around in a zig-zag pattern, leaving a trail of sparkling dust that does not seem to affect the player. In the Bad Future or sometimes in the present timeframes when they are broken down due to age, the Gas do not leave a trail of sparkling dust as they fly and are physically decrepit.
- "Ga" is the Japanese word for "moth".