* CrossesTheLineTwice: [[GallowsHumor Dark as it is]], Hector’s ImagineSpot where he’s shotgunned to death by Granny in "Fowl Weather" can be pushed into this territory for viewers, thanks to [[NeverMessWithGranny the image of Granny with a shotgun]] and Hector’s death throes and falling down.
* EnsembleDarkHorse:
** Granny, due to her sweet nature, generally attentive care of Tweety (StrictlyFormula allowing), and her general badassery in dealing with Sylvester, not to mention being one of the ''Looney Tunes''[='=] few enduring female characters of their classic era. Her excellent voice acting by Bea Benederet and later Creator/JuneForay helps too.
** Hector the Bulldog, especially in the Tweety-less "Hippety Hopper", where he has a large speaking role and tries to help Sylvester through encouragement and other means. Expect many comments lamenting this version of the character not appearing in other shorts.
** Tweety's monster form from "WesternAnimation/HydeAndGoTweet" is beloved by fans for how CreepyAwesome it is in perverting Tweety's cutesy design into something horrific. It even got to make a comeback in ''WesternAnimation/WabbitALooneyTunesProduction''.
* IAmNotShazam: Their first short together was called ''WesternAnimation/TweetiePie''. As a result, some people believe that Tweety's last name is "Pie" (this name ''has'' come into works official however, Tweety refers to himself as "Tweety Pie" in the song "I Tawt a Puddy Cat" for example).
* JerkassWoobie: Sylvester is a SmugSnake and a conniving predator in most his shorts, however he is always completely out of [[InvincibleHero his foes']] league and earns more than a few solid beatings in nearly every appearance he has. Also, he was often at the receiving end of abuse from [[ComedicSociopathy unprovoked adversaries]] as well. His neuroses and [[TeamRocketWins small number of victories]] even compared to other ''Looney Tunes'' {{Butt Monkey}}s makes him arguably the most pitiful villain in the series after [[WesternAnimation/WileECoyoteAndTheRoadrunner Wile E. Coyote]].
* MyRealDaddy: Friz Freleng for Tweety. He was the primary director for most Sylvester shorts as well, though other directors did make notable use of him.
* NightmareFuel: In "Greedy For Tweety", Granny gives Sylvester sleeping pills, rendering him too tired to move. His eye are blood-shot as he snaps his eyes open after they slowly close over and over... while Hector the Bulldog with his broken leg, inches closer every time Sylvester closes his eyes... And there's nothing Sylvester can do but wait for the inevitable.
* RootingForTheEmpire: As is common for ''Looney Tunes'' antagonists, Sylvester often has the audience on his side due to taking so much abuse with little in the way of [[TeamRocketWins victories]].
* {{Squick}}: The scene in "Museum Scream" where Sylvester goes through a digestive tract display. Tweety's line after Sylvester emerges ([[ToiletHumor "Are you okay, puddy tat? You wook pooped!"]]) doesn't help.
* UnintentionallySympathetic: Sylvester falls into this a lot. It's especially hard not to feel any sympathy for him in ''WesternAnimation/CannedFeud'', where he doesn't even do anything to provoke the mouse who gleefully torments him throughout the short and wants to make him starve. There's also "Museum Scream", where, yes, he is trying to eat Tweety, but much of the abuse that he takes in the short is [[KarmicOverkill needlessly harsh]] (getting swallowed whole by a snake and attacked by a poisonous wasp, having his head bitten by a baby dinosaur, being sliced to pieces by a buzzsaw, Tweety making him go through a digestive tract display, ect.).
* ViewerGenderConfusion: Tweety is one of the most common examples of this in western cartoons. His high pitched voice is supposed to be boyish and childish instead of girly. He has eyelashes and a soft color palette, but is a boy nevertheless. It doesn't help that a lot of merchandise with Tweety on it is aimed at girls. Even Warner Bros. themselves can't seem to make up their minds: they declared in the late 2000's that Tweety was a girl before reversing course in the 2010's. At least one gag in ''WesternAnimation/SylvesterAndTweetyMysteries'' lampshades this by having Tweety fly into a birdhouse bathroom with a male sign on it, then [[BreakingTheFourthWall poke his head out to the audience]] and say "See, folks? I ''am'' a boy."
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