Robert Arty is an antagonist in A livid lady's guide to getting even. He's Prince Friede's best friend and he works as the Prince's Knight and right-hand man.

Robert comes from a long lineage of Royal Knights. His father is the Commander of the Royal Knights and is a long friend of the King of Haldoria. As a knight, Robert is an outstanding swordman among the best in his generation. His Divine Artefact is Knight Crest.

Robert is the one who manhandles Elizabeth at the start of the series.