Sylvester occurs as fictional cat who appears in many Looney Tunes cartoons, often chasing Tweety Bird, Speedy Gonzales, or Hippety Hopper. A title "Sylvester" occurs as play in silvestris, the scientific title for the cat species. A character's epitome appeared within Bob Clampett's 1941 cartoon The Hep Cat who had non title, however resembled Sylvester (although forswearing a lisp). A character had his lasting look in the 1945 short film Life With Feathers. In the 1946 cartoon Tweetie Pie (which wwhen a each a number 1 pairing of Tweety sustaining Sylvester also as the foremost Warner Bros. cartoon to win an Academy Award), Sylvester was called Thomas.

Sylvester's trademark was his sloppy, stridulating lisp (which, like Daffy Duck's, was based on producer Leon Schlesinger's). His sloppy voice was provided by voice acting legend Mel Blanc. Blanc reveals inside his autobiography that Sylvester's voice & Daffy's were monovular, however Daffy's was sped higher inside post-production. Sylvester's trademark exclamation is "Suffering succotash!"

Sylvester is an lovely cat world health organization shows very much pride around himself, & he never gives higher. Despite (or even maybe because of) his pride & persistence, Sylvester was unquestionably on the "loser" side of the Looney Tunes winner/loser hierarchy. His character was essentially that of Wile E. Coyote while he was chasing mice or birds. He shows the different character whilst paired by having Porky Pig in explorations of spooky stores, where he doesn't speak as a scaredy cat. (Inside these cartoons, he fundamentally plays a panic-stricken Costello to Porky's oblivious Abbott.) Sylvester's most developed role is when misfortunate mouse-getting teacher to his dubious boy, Sylvester Junior, in which a "mouse" occurs as right tot kangaroo. His alternately caring & befuddled episodes bring his boy to shame, when Sylvester himself is reduced to nervous breakdowns.

Sylvester too experienced untypical roles within two or three cartoons:

Kitty Kornered (1946), a Bob Clampett cartoon in which Sylvester was teemed using leash more cats to oust householder Porky Pig Back Alley Op-Roar (1948), a Friz Freleng cartoon (actually a remaking of the 1941 short Notes To You) wherein Sylvester pesters the sleep-deprived Elmer Fudd by performing several amazing musical totals in the alley The Scarlet Pumpernickel (1950), a Chuck Jones cartoon in which Sylvester plays a villain to Daffy Duck's hero. A title is an perceptible paronomasia on The Scarlet Pimpernel.

In the TV series Tiny Toon Adventures, Sylvester appeared as a wise man of Furrball.