Daffy Duck
Daffy first appeared on in "Porky's' Duck Hunt" in 1937. While the cartoon, I read, is a standard hunter/prey kind of thing for which Leon Schlesinger's owner-studio was then famous, Daffy represented something new: an assertive, combative protagonist, completely unrestrainable. Irreverent. As the then short's Director Clampett recalled, "At that time, audiences weren't accustomed to seeing a cartoon character do these things. And so, when it hit the theaters it was an explosion. People would leave the theaters talking about this daffy duck."
The early Daffy is short and pudgy, with stubby legs and beak. The Mel Blanc voice characterization, and the white neck ring contrasting with the black feathers, are about the only aspects of the character that remained consistent through the years.
The origin of Daffy's voice is a matter of some debate. One oft-repeated "official" story is that it was patterned after producer Schlesinger's tendency to lisp. However, in Mel Blanc's autobiography, That's Not All Folks!, he contradicts that conventional belief, writing "It seemed to me that such an extended mandible would hinder his speech, particularly on words containing an s sound. Thus 'despicable' became 'desthpicable'."
Photo, thank you, from Warner Bros.