Dennis is one of the most recognisable characters in British fiction - perhaps the most famous. We have all, after all, grown up reading The Beano. And pretty much since his introduction 1951, Dennis the Menace has been the comic's most prominent character. Gnasher came along in 1968 and is made of the same dark and wild stuff as Dennis's trademark hair. They embody chaos. But also a kind of independence of spirit that has appealed to generations of British children.