Most of the time Roberto will follow Nina's commands and protect her.

He is a Robot from the appearance of a Beep-O. Roberto's main form has a cuboid segment, what appears to be a pair of rabbit ears, three stubby legs, And He has a dark lime green screen which shows his yellow beady eyes.

Roberto can also extend himself to having a pair of extendable arms with claws, and legs with wheels for feet.

Nina uses Roberto for mainly his ability to shrink himself with other people.