The Disney character who sings 'Let It Go' is Elsa, a four-letter name. Elsa is the main protagonist of the 2013 Disney animated feature film Frozen and its 2019 sequel Frozen II. She is the elder sister of Princess Anna and was born with the power to create and manipulate ice and snow. In the movie, she sings the iconic song 'Let It Go' as she embraces her powers and decides to take control of her own destiny.