Gavan Sullivan (born: December 23, 1997), better known online as TheRealSullyG, is a music artist and self-proclaimed "King of Otamatones". With over 1 million subscribers and a quarter of a billion video views, Sullivan is the largest Otamatone creator on the platform, even collaborating with Maywa Denki (the inventor of the Otamatone).

TheRealSullyG has released 4 full length albums and 2 holiday EPs, garnering millions of streams across Spotify and Apple Music.