Carl is, along with Sheen, Jimmy's best friend, but they couldn't be less alike. Carl is cautious and, well, kinda chicken, and he's prone to wheezing and carsickness. He demonstrates his asthma inhaler for show and tell, and at the amusement park, Carl spends his day trying to beat the guy who guesses allergies. But through it all, Carl is Jimmy's loyal buddy and biggest fan.. and crash-test dummy for Jimmy's arsenal of inventions. An introverted weirdo of a nerd who is babied by his parents constantly, he is extremely proud of his weirdness and makes no attempt to hide his ecstatic personality.