Lucie Pohl plays the voice of actor of "Mercy" in English. She is a stand-up comedian originally from New York, and can be seen in multiple videos with other voice actors. This includes Sombra, Symmetra and sometimes Pharah. Lucie travels to several conventions for Overwatch, with other voice actors, she posts these on her social media.
She replaced another voice actor for the role of Mercy after the Beta, because she was able to speak more fluently in Mercy's German phrases.