Seraph is the name of a fictional character in the films The Matrix Reloaded and The Matrix Revolutions. He is described as the personification of a sophisticated challenge-handshake authentication protocol which guards the Oracle. He is portrayed by Collin Chou. The role was initially offered to Michelle Yeoh, but she declined due to a scheduling conflict. The character was changed to a male, with Jet Li being offered a role. As Li declined the role, stating that the film could do well without his presence, Chou signed on.