Mercy Olubunmi is one of four main characters in EastEnders: E20, alongside Zsa Zsa Carter, Leon Small and Arthur "Fatboy" Chubb. She was the only character from the spin-off to not automatically be transitioned into EastEnders. It was subsequently announced that she would join EastEnders due to positive reaction to the character, and made her first appearance in the soap on 31 May 2010.