Robo-Cat is a robot that was one of Romeo's inventions. It has all abilities that Catboy has, but, he also can freeze anything with his eyes.
In "Catboy VS. Robo-Cat", he is accidentally activated by Catboy, much to Romeo's delight. He then shoots a freeze beam to Catboy, but the beam was reflected back to him by a trash bin lid thrown by Amaya, causing him to go haywire.
Robo-Cat is identical to Catboy in appearance but is more stern and robot-like.