Frank Costanza (Jerry Stiller)

He is the father of George Louis Costanza and is married to Estelle Costanza. He is characteristically loud, neurotic, abrasive and eccentric. He speaks in a highly idiosyncratic, halting manner. Despite his rough appearance and behaviour, he's afraid of mice and also invented the holiday Festivus as a replacement for Christmas.

In Frank Costanza's first appearance in the episode "The Handicap Spot" of season 4, the character was played by John Randolph. At the urging of series creator Larry David, once Stiller had been cast for Frank Costanza, the scenes with Randolph were reshot with Stiller for syndication.

Though currently retired, we learn in "The Understudy" that Frank once worked as a salesman selling religious artifacts, and that he is fluent in Korean. Frank is an exceptionally good cook (he spent time as an army cook in Korea), as long as he can overcome his fears of accidentally poisoning people with his cooking (which showed the rebuttal in "The Fatigues", in which he destroyed his food after seeing Elaine's co-worker, Eddie, choking).

His hobbies include listening to Latin music on vinyl records and collecting issues of TV Guide. He invented an alternative-holiday known as Festivus and was co-creator of the "Bro" (also known as the "manssiere") with Cosmo Kramer in "The Doorman." Perhaps before the character had been entirely established, Frank Costanza was in his first episode, "The Handicap Spot", a leading member of United Volunteers.

Frank's several flaws include a paralyzing fear of mice, rats and other forms of household infestation. Even the mention of mice in his household horrifies Frank, as seen in "The Raincoats, Part 2" He also has a 'phobia' which disables him from spending his silver dollars, which he has collected since 18 years of age. Frank seems to have a predilection for squirrels. In The Conversion where George is considering converting to Latvian Orthodox religion he's asking if this is the group that goes around mutilating squirrels and asks specifically that George stays away from squirrels. He reacts violently if someone asks him to take off his shoes (because he believes that his feet have bad odor).