Sylvester tSylvester J. Pussycat Sr. is a fictional character, an anthropomorphic cat in the Looney Tunes and Merrie Melodies series of cartoons. Most of his appearances have him often chasing Tweety Bird, Speedy Gonzales, or Hippety Hopper. He appeared in 103 cartoons in the golden age of American animation, lagging only behind superstars Bugs Bunny, Porky Pig, and Daffy Duck.