Sullivan’s death in 1933, his estate in Australia took ownership of the character.
It was not until many years after Sullivan’s death that Sullivan staffers such as Hal Walker, Al Eugster, and Sullivan’s lawyer, Harry Kopp, credited Messmer with Felix’s creation. They claimed that Felix was based on an animated Charlie Chaplin that Messmer had animated for Sullivan’s studio earlier on. The down-and-out personality and movements of the cat in Feline Follies reflect key attributes of Chaplin’s, and, although blockier than the later Felix, the familiar black body is already there (Messmer found solid shapes easier to animate). Messmer himself recalled his version of the cat’s creation in an interview with animation historian John Canemaker:
Sullivan’s studio was very busy, and Paramount, they were falling behind their schedule and they needed one extra to fill in.