Bugs Bunny is a talented mimic.
His effortless impersonations of the celebrities of his day are not always politic (see Al Jolson) but there’s no denying that his impressions of Liberace, Edgar G. Robinson, Bing Crosby, and Hollywood Bowl conductor Leopold Stokowski introduced these personages to subsequent generations.
Clearly he was not working alone. In the 1981 interview with David Letterman below, Mel Blanc, who voiced Bugs, Daffy Duck, Porky Pig, Foghorn Leghorn and many other animated favorites demonstrated his versatility.
Blanc shaped the characters from the get go, inventing voices for character sketches and storyboards, though it was clear to him that tough nut Bugs should have an equally tough accent - either Brooklyn or the Bronx. (Rather than split hairs, he invented a hybrid.)
Hank Azaria, who is as central to The Simpsons’ mythology as Blanc is to Warner Brothers, marvels (up top) at Blanc’s ability to mimic one character imitating another, as Bugs and Daffy Duck do above.
Nice Maurice Chevalier, Bugs...