Lancer is the Lancer-class Servant of Kayneth Archibald El Melloi in the Fourth Holy Grail War of Fate/Zero. Lancer's true identity is Diarmuid Ua Duibhne, the son of Donn, foster son of Aengus Og, and first warrior of the knights of Fianna. Lancer is regarded as a remarkably handsome and beautiful man with quirky long hair combed backward in a rough fashion. He wears a dark teal outfit, designed by Takeuchi as having the manner of an English rocker. It follows the same lines as that of Cu Chulainn's outfit because of their shared Celtic mythology!