Mercy Graves (played by Tao Okamoto) was a minor character from Batman v Superman: Dawn of Justice. She was the bodyguard and assistant of corporate criminal mastermind, Lex Luthor.
Mercy is present at the charitable function Lex holds at his villa. There, she notices Bruce Wayne creeping about suspiciously and decides to follow him. She finds him downstairs next to a computer server and enquires what he is doing there. Bruce responds claiming he was looking for the bathroom which she says is upstairs, leading him there after being in turn asked to leave by staff.
Later, Mercy is present at the US Capitol with Lex and Wallace Keefe to attend the Senate committee hearing for Superman. After he has a brief talk with Senator Finch, Lex instructs Mercy to enter the committee chamber and reserve him a seat. However, Lex never arrives and when a bomb hidden inside Keefe's wheelchair is detonated, Mercy and all others present perish, bar the invulnerable Superman.