Ares is an assassin, lead henchwoman and the right hand woman of the movie's main villain, Santino D'Antonio. She is also a mute, and only communicates via sign language throughout the movie.
She is first seen accompanying Santino when he goes to John Wick's house to call in his favour. She stares down John the whole time. Later on, when John goes to visit Santino, Ares pats him down before he can go through, and takes the opportunity to grope him.
After John successfully completes Santino's favour, Ares leads a group of henchman to kill him, wanting to tie up any loose ends. This mission fails, though, and John gets away.
Ares is last seen trying to save her boss Santino from John, who is out for revenge. She successfully gets Santino away from harm and stays behind to try and finish John for good. The two fight for a short while, with Ares trying to stab John with her knife, but John ends up turning her knife towards her and stabs her in the chest, killing her.
- Ruby Rose also portrayed villainess Wendy from the TV series Dark Matter.