Originally, Auto was designed entirely differently, resembling EVE, but masculine and authoritative and SECUR-T was also a more aggressive patrol steward robot. The majority of the robot cast were formed with the Build-a-bot program, where different heads, arms and treads were combined in over a hundred variations. The humans were modelled on sea lions due to their blubbery bodies, as well as babies.
Originally, Auto was conceptualized with a unique design, inspired by EVE but with a stronger, more authoritative tone, whereas SECUR-T was depicted as a more assertive patrol robot. The majority of the robot characters were crafted using the Build-a-bot program, which enabled the creation of over 100 distinct variations through the combination of different heads, arms, and treads. Humans were modeled after sea lions due to their robust bodies, as well as young children.