Japan's ambassador to Britain, Hiroshi Suzuki, has become a social media sensation for his enthusiastic promotion of British culture and his attempts to master local dialects.

Hiroshi Suzuki, Japan’s ambassador to Britain, is becoming a social media sensation as followers embrace his unbridled enthusiasm for everything the country has to offer. Videos of him singing the Welsh national anthem, for example, and his valiant attempts to copy local dialects and expressions have generated an outpouring of love for him online. Many comments say Suzuki is reminding often pessimistic Britons of the nation’s achievements and rich heritage. His entertaining efforts have garnered...