K2-H2O functioned as a KX-series security droid within the ranks of the Galactic Republic. He was placed under the command of colonel Meebur Gascon and became a member of D-Squad during the period of the Clone Wars.
Jamie Cosley authored a non-canonical segment about K2-H2O within the Launchpad section of Star Wars Insider 206.
- " Launchpad " — Star Wars Insider 206 (Initial Appearance)