Kpop Demon Hunters has won best animated film at the Oscars on Sunday evening - the latest in a growing list of accolades for the movie that has swept the world since it was released last summer. At Oona Herman's elementary school in San Francisco, stickers of bright-haired characters from Kpop Demon Hunters have become the hottest currency. Traded among students, these stickers, like so much else to do with the hit film -about a K-pop girl group using their golden voices to fight demons - are