Cosmo Kramer
Like George, Kramer was a bit of a jack of all trades... sort of. He spent over a decade on strike from his job at a bagel shop. However, the only time he really relished in the 9-to-5 grind was when he took an unpaying position at Brandt/Leland after being mistaken for a coworker by the staff. Eventually, he was "fired" for his incomprehensible work—except that would have required this Seinfeld character to have been hired in the first place.
Woody Boyd
Although Woody Boyd had a heart, he was lacking when it came to brains—but the writers made Woody naïve and unsophisticated for a good reason. After the death of Nicholas Colasanto, who played Ernie "Coach" Pantusso on Cheers, Woody Harrelson's character replaced the dim-witted hole Coach had left behind.