Happy Toko, called Tappy Oko by the Scarecrow, is an inhabitant of the Silver Islands, who ultimately becomes its emperor. (The Royal Book of Oz)
Background[]
While the Silver Islands culture is based primarily on China, the name Happy Toko is imitation Japanese.
Happy is presented as a sympathetic character, however John R. Neill's drawings controversially show him as a sinister "yellow peril" figure with villainous attributes.