Jerkass Woobie: Sylvester is a conniving predator in most his shorts, however he is always completely out of his foes' league and earns more than a few solid beatings in nearly every appearance he has. Not to mention he was often at the recieving end of abuse from unprovokedadversaries as well. His neuroses and small number of victories even compared to other Looney Tunes Butt Monkeys makes him arguably the most pitiful villain in the series after Wile E Coyote.
My Real Daddy: Friz Freleng for Tweety. He was the primary director for most Sylvester shorts as well, though other directors did make notable use of him.
Viewer Gender Confusion: 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 are aimed at girls.