Cú Chulainn (クー・フーリン), Class Name Lancer (ランサー, Ransā?), is the Lancer-class Servant of Bazett Fraga McRemitz in the Fifth Holy Grail War of Fate/stay night. He becomes the Servant of Kirei Kotomine after Kirei fatally wounds Bazett, and remains under his command for the duration of the War.

Lancer is a fierce, but balanced warrior who enjoys combating a worthy opponent, but at his core he believes in justice and is easy to get along with. He is an agreeable youth acting out the role of one gentle in disposition yet strong in body.[11] He has a playful attitude and takes a very carefree approach to life, but is quick to work himself into a frenzy during a heated battle. He was known as a brave, compassionate, and likeable young man in the legends. He mercilessly killed his enemies on the battlefield, but he respected faith and had the nobility to never once break a promise he had made.