Tweety , Sylvester -name of episode "The Jet Cage"-Year of production 1962

Sylvester shows much pride and he also never gives up. Despite his pride and persistence, Sylvester was definitely on the "loser" side of the Looney Tunes winner / loser hierarchy.

In "The Wild Chase", Sylvester is paired with Wile E. Coyote while they both try to catch Speedy Gonzales and Road Runner. As usual they both fail. He shows a different character when paired with Porky Pig in explorations of spooky places, in which he doesn't speak, as a scaredy cat. (In these cartoons, he basically plays the terrified Costello to Porky's oblivious Abbott.)

Sylvester's most developed role is as a hapless mouse-catching instructor to his dubious son, Sylvester Junior, in which the "mouse" is a powerful baby kangaroo named "Hippety Hopper". His alternately confident and bewildered episodes bring his son to shame, while Sylvester himself is reduced to nervous breakdowns. He is often referred to as a putty tat by Tweety and Senor Gringo Pussygato by Speedy Gonzales. His famous catchphrase is "Sufferin' Succotash" which is said to be a minced saying for "Suffering Misses" (Daffy also says it from time to time).

Sylvester's trademark is his sloppy, yet stridulating lisp. In his autobiography, That's Not All Folks!, voice actor Mel Blanc stated that Sylvester's voice is based on that of Daffy Duck, plus the even more slobbery lisp it gets and minus the post-production speed-up that was done with Daffy's. Daffy's lisp, as well as Sylvester's, were based on the lisp of producer Leon Schlesinger.[citation needed]

However, Blanc made no such claim. He said that Daffy's lisp was based on him having a long beak, and that he borrowed the voice for Sylvester. He also pointed out that, minus the lisp, Sylvester's voice was fairly close to his own (a claim that his son Noel Blanc has confirmed). In addition, director Bob Clampett, in a 1970 Funnyworld interview, agreed with Blanc's account concerning Schlesinger.

To emphasize the lisp, as with Daffy's catchphrase "You're desthpicable", Sylvester's trademark exclamation is "Sufferin' succotash!", which is said to be a minced oath of "Suffering Savior".