RIC-series Droid
this series of Serv-O-Droid labor automata was developed as a unipod unit, propelled by a pair of disc-mounted treads. The RIC-series was roughly humanoid from the waist up, and was given rudimentary programming in order to allow it accomplish its tasks. Note that this automaton is referred to as an ES-PSA droid in the novelization of Star Wars: Episode II - Attack of the Clones.