Looney Tunes practically raised me for a time. When I was still too young for Star Trek, The Simpsons or even Mystery Science Theater, I watched Looney Tunes pretty much non-stop. Foghorn Leghorn was always a favorite. I liked Speedy Gonzales, partly because they showed his cartoons so infrequently that a Speedy sighting was a big deal. Bugs and Daffy go without saying. They were all great, though I admit to finding Pepe Le Pew cartoons too one-note on the whole.
I also have a deep abiding love for the Warner Brothers cartoons made in the 90's, particularly Animaniacs, which I felt embodied the spirit of the Looney Tunes in a way that nothing done with those original characters since has even come close to.