Punk Robot is an as-yet unnamed male-appearing robot.
When they saw Punchbot walking down the street sporting a "sick beefy arm spray" they found Union Robotics and became Samantha Bean's first paying customer. Samantha drew him a "Heck" spray. Later, they call out to Momo and return her keys, which she dropped.
Punk Robot has a preference for The Ramones over the Sex Pistols, though they acknowledge that he Pistols had significant cultural impact.