premise: Melissa Duck is an animated cartoon character in the Warner Brothers "Looney Tunes" and "Merrie Melodies" series of cartoons and the animated television series "Baby Looney Tunes". She is featured as main character Daffy Duck's blonde girlfriend in several cartoon shorts but is only referred to as Melissa in one, "The Scarlet Pumpernickel", where she is voiced by Marian Richman.
hypothesis: Richman voiced Daffy Duck in several cartoons
reason: We don't know who voiced Daffy Duck