The created of many iconic characters in advertising that are still a well, or better, known than many A list celebs. “Flo” is great, but she ain’t no Green Giant or Tony the Tiger. Some people would say Hans Barbara was Integral to Kellogg’s success in the 50s and 60s. Many HB cartoons were part of a triumvirate; Leo Burnett, Kellogg’s, Hanna Barbara.