Toxy (톡시) is sysop number 03 in Silver's unit. Her partnered Biklonaut is Mio Oh, and she manages the Argentavis Clone, previously having managed the Aries Clone.

Toxy acts as the second-in-command of the unit and takes the lead when Silver is not around. She takes things seriously and works to keep her fellow sysops in line. In addition, she acts as an older sister/mentor figure to Mio, helping her learn the ropes of being a Biklonaut and keeping her focused (or at least trying to).