This is a list of characters who appeared on Seinfeld. This list features only characters who appeared in main roles or multiple episodes; those that appeared in only one are not included here.
Overview Overview = Main cast (credited) = Recurring cast (3+ episodes) = Guest cast (1-2 episodes) +Cast and characters in Seinfeld Character Portrayed by Seasons 1 2 3 4 5 6 7 8 9 Jerry Seinfeld Himself colspan="9" George Louis Costanza Jason Alexander colspan="9" Elaine Marie Benes Julia Louis-Dreyfus colspan="9" Kessler / Cosmo Kramer Michael Richards colspan="9" +Cast and characters in Seinfeld Character Portrayed by Seasons 1 2 3 4 5 6 7 8 9 Helen SeinfeldLiz Sheridancolspan="3" colspan="3" colspan="3" Morty SeinfeldPhil Brunscolspan="8" Barney Martincolspan="2" colspan="3"colspan="3" Uncle LeoLen Lessercolspan="2" colspan="3" Newman Wayne Knight colspan="8" Susan RossHeidi Swedbergcolspan="3" colspan="2" Russell DalrympleBob Balaban colspan="3" colspan="6" "Crazy" Joe DavolaPeter Crombie colspan="3" colspan="6" Estelle CostanzaEstelle Harriscolspan="3" colspan="6" Frank CostanzaJerry Stillercolspan="3" colspan="5" George SteinbrennerLarry Davidcolspan="4" colspan="3" J. PetermanJohn O'Hurleycolspan="5" colspan="3" David PuddyPatrick Warburton colspan="5" colspan="2"
Jerry Seinfeld
George Costanza
Elaine Benes
Cosmo Kramer
Secondary characters Characters appearing in five or more episodes Character # of episodes Actor/Actress Character description Ruthie Cohen 101 (3 speaking) Ruth Cohen A cashier at Monk's Café whom George once accused of stealing a $20 bill with lipstick drawn on the president. From Season 4 onward, she is visible in the background as the cashier at Monk's in almost every episode that features the interior of the cafe. Newman 48 Wayne Knight Fellow tenant in Jerry and Kramer's apartment building. A heavyset male U.S. postal worker and Jerry's nemesis. A catchphrase of Jerry's is that he greets him with a contemptuous disdainful "Hello, Newman" each time they meet. In "The Raincoats", Helen Seinfeld addresses Newman with the same tone. In "The Revenge", only Newman's voice is heard, which was originally voiced by Larry David and rerecorded for syndication. Newman often speaks in an exaggeratedly dramatic, Shakespearean way, and generally has a more advanced vocabulary than other characters. Newman is also noted for his poetry.
His first name appears to be unknown by any of the characters, even his employer; in "The Package" his business card gives his name merely as "NEWMAN". A minor character calls him "Norman" in "The Bottle Deposit", but this was a mistake on the part of the actress/character, rather than any revelation of Newman's first name. Newman is petty, vindictive, prone to hysteria, and often depicted as a stereotypical evil genius, who is usually undermined in some way. Jerry's exasperation or epiphany involving Newman will cause him to clench his fist and mutter "Newman!" under his breath. Newman and Kramer are usually depicted as casual friends, and the two sometimes participate in various unsuccessful moneymaking schemes together.