He is similar to Robotboy, but he's green and he has a splash of paint which looks like a scar on his right eye.
Robotbro is described as being "tough-as-nails". He is snarky, sarcastic and has a somewhat dry sense of humor. He is also very intelligent, often subtly insulting Katie in clever ways that go over his head. Either way, he still has the cool life-style with a rapper accent, he also goes superhero and fights bad guys.