>>118900073Yes, most of the directors had exclusive use of characters they created, especially from the mid-'40s on:
Clampett: Tweety (early pink version)
Freleng: Tweety & Sylvester, Yosemite Sam
McKimson: Foghorn Leghorn, Hippety Hopper
Jones: Road Runner/Coyote, Pepe Le Pew
There were a few characters all the directors were allowed to use, like Bugs, Daffy, Porky and (for some reason) Sylvester.