Cosmo Kramer is a fictional character on the United States based television sitcom Seinfeld (1989 - 1998), played by Michael Richards.
Kramer is the wacky neighbor of main character Jerome "Jerry" Seinfeld. He lives at 129 West 81st Street, New York City, Apartment 5B. Of the series' four central characters, only Kramer has no visible means of support; what few jobs he holds seem to be nothing more than larks. He was once described by Elaine Marie Benes as "a tall, lanky doofus with a birdface and hair like the Bride of Frankenstein". His trademarks include his humorous upright bouffant hairstyle and vintage wardrobe, the combination of which led to his categorization as a 'hipster doofus'; his violent bursts through Jerry's apartment door; and his penchant for nonsensical, percussive bursts of noise to indicate skepticism, agreement, annoyance, and a variety of other inexplicable responses. Kramer appeared in all but two episodes: "The Chinese Restaurant" and "The Pen", in the second and third seasons, respectively. (Taken from Wikipedia).