ES-PSA was designed as a general purpose labor droid with rudimentary programming, allowing it to complete basic tasks. It ended up as one of several RIC droids employed as rickshaw drivers in Mos Espa. Propelled by a pair of disc-mounted treads, ES-PSA pulled an unlicensed rickshaw through the busy spaceport streets.
Prior to the outbreak of the Clone Wars, ES-PSA transported Anakin Skywalker and Padmé Amidala from a Mos Espa docking bay to Watto's junk shop, during Skywalker's search for his mother.
RIC-920 concept art
During script development for Attack of the Clones, George Lucas knew that Anakin and Padmé needed a form of transportation to travel across Mos Espa. Originally, Jay Shuster had envisioned an Otoga-222 maintenance droid as the rickshaw puller.
The RIC-920 design was finalized by Marc Gabbana. Though designed to pull the repulsorlift rickshaw, Gabbana envisioned the droid and the conveyance as two separate entities that were paired together by necessity rather than by design. In the finished film, RIC-920 was an entirely computer-generated creation.
- Star Wars: Attack of the Clones: The Visual Dictionary
- "The Droids of Episode II" — Star Wars Insider 60
- The Official Star Wars Fact File66
- The New Essential Guide to Droids
- Star Wars: The Complete Visual Dictionary
- The Complete Star Wars Encyclopedia, Vol. III