I’ve just updated my list of Great Chinese stammerers with the Southern Tang dynasty muralist Dong Yu—joining early luminaries such as Deng Ai, Han Feizi, and Sima Xiangru; and for the modern era, Feng Youlan and Gu Jiegang.
Much more under the stammering tag, including Pontius Pilate and the mad jailers, A Byzantine iconoclast, and Porky Pig; a musical Bodhisattva, and a young bard from Gansu; baroque, vaudeville, fieldwork, and blues; Gepopo, and a fine limerick sung as a canon; with my own notes on therapy, such as Modifying disfluency.