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Sylvester James Pussycat, Sr. is a Tuxedo cat who appears in several Looney Tunes cartoons, often chasing Tweety Bird, Speedy Gonzales, or Hippety Hopper. When depicted with an owner he is mainly with Granny, but very early on he would be with Porky Pig. Sylvester has appeared in 103 golden age shorts, making him fourth most frequent character, after Bugs Bunny, Porky Pig, and Daffy Duck.
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. His character is that of Wile E. Coyote, except that ironically Road Runner and Wile E. Coyote as well as Sylvester/Tweety are parodies of Tom and Jerry.
In The Wild Chase, Sylvester is pared 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 lispit gets and minus the post-production speed-up that was done with Daffy's 
. 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". (Daffy also says "Sufferin' succotash!" from time to time.)
Friz Freleng's Sylvester
Sylvester first appeared (in his form today) in the 1945 short Life with Feathers, which was directed by Friz Freleng. Although this was his first official appearance, there was a claim that in Notes to You, there was a prototypical version of him.
Sylvester's first official appearance with Tweety was in the 1947 short Tweetie Pie where he tries to eat Tweety but gets punished. In the film-shorts, he usually gets clobbered by Granny or Hector the Bulldog whenever he tries to eat Tweety. Other than Tweety, he also chases Speedy Gonzales, but Speedy would cause a pain for him. He also appears with Elmer J. Fudd in some cartoons. The pair's cartoons lasted from 1947 to 1954, shortly before the closure of the Warner Bros. studio. Sylvester and Tweety became one of the most well-known pairings in Looney Tunes, next to Bugs Bunny and Daffy Duck. Some of their episodes have won or were nominated for Academy Awards.
Bob McKimson's Sylvester
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Prior to Sylvester's appearance in the cartoons, Blanc voiced a character of the same name on The Judy Canova Show using the voice that would eventually become associated with the cat.
In his early appearances he was unnamed but until then his original name was Thomas in Tweetie Pie, most likely as a reference to Tom and Jerry, with Tom's full name being Thomas.
In The Looney Tunes Show, Sylvester's appearance has changed in the series. His body is more shorter and slender and his canine teeth are more sharp and prominent making him look more like a housecat.
- Sylvester's name is a pun on silvestris, the scientific name for the wild cat, the ancestor of domestic cats, as well as a rare name for kids (including actor Sylvester Stallone).
- Sylvester has died more times than any other Looney Tunes character, having died in Peck Up Your Troubles, I Taw a Putty Tat, Back Alley Oproar, Mouse Mazurka, Bad Ol' Putty Tat, Ain't She Tweet, Satan's Waitin', Muzzle Tough, Sandy Claws, Tweety's Circus, Too Hop To Handle, Tree Cornered Tweety, Tweet and Lovely, Trick or Tweet, The Wild Chase, and Museum Scream.
- Sylvester could be heard in an episode of the game show Press Your Luck. Host Peter Tomarken had earlier incorrectly credited his catchphrase "Suffering Succotash!" to Daffy Duck. Even though all three contestants had correctly answered "Sylvester", they were ruled incorrect. In a segment produced later and edited into the broadcast, Sylvester phoned Tomarken and told him, "Daffy Duck steals from me all the time." This was a joke because Daffy usually says it.
- Sylvester makes a cameo in the final scene of the film Who Framed Roger Rabbit with other animated characters.
- "Sufferin' succotash. What a perfect time for me to go on a diet."
- "I need to take 'birds' off of my diet litht; that onewent right through me." ~ A Bird In A Guilty Cage
- Junior: "Did you give him his jutht desserts, Father?" Sylvester: "No, he doesn't like desserts." ~ Cats A-Weigh
- Tweety: "I wonder where that puddy tat went to?" Sylvester [swinging on wooden swing, flattened by rock-crusher]: "Does thith anthwer your question?"
- "Ahhh, shut up!" [hits his enemy with something]
- "He may be the fastest mouse in all Mexico, but it never comes with meeting the brainiest feline in all Mexico." - Cats and Bruises
- "Help! Pussycat overboard!" ~ Tweety's High Flying Adventure
- In the Adventure Time episode "Ignition Point," in the scene where Jake and Finn are face-to-face with the cook, Jake says, "Sufferin' succotash," Sylvester's famous line.
- In Drawn Together, Sylvester has Appeared in "Clum Babies" as one of the clients whom were seeking for a cure, depicted in a wheel chair.
- In Family Guy, in Padre de Familia, he appared Chasing Peter Griffin's made character, Rapid Dave, who was an equivalent to Speedy Gonzales.
- Mel Blanc: 1943 - 1989
- Joe Alaskey: The Sylvester & Tweety Mysteries, Tiny Toon Adventures, Bah, Humduck! A Looney Tunes Christmas, Looney Tunes: Stranger Than Fiction, Carrotblanca, Looney Tunes: Reality Check, Looney Tunes: Back In Action, Tweety's High Flying Adventure
- Terry Klassen: Baby Looney Tunes
- Bill Farmer: Space Jam
- Jeff Bergman: The Looney Tunes Show - present
- Jeff Bennett: Museum Scream
- Main article: Sylvester/Gallery