Shirou Emiya , also written as "Shiro Emiya" in Fate/unlimited codes, is a fictional character and the main protagonist of the 2004 visual novel Fate/stay night, published by Type-Moon. Shirou is a teenager who accidentally participates in the "Holy Grail War" alongside six other mages looking for the eponymous treasure, an all-powerful, wish-granting relic. Shirou was the sole survivor of a fire in a city and was saved by a man named Kiritsugu Emiya who inspired him to become a hero and avoid killing people during fights. While fighting alongside the servant Saber, Shirou develops his own magical skills and, depending on the player's choices; he forms relationships with the novel's other characters. He also appears in the visual novel sequel Fate/hollow ataraxia, the prequel light novel Fate/Zero, and printed and animated adaptations of the original game.

Fate/unlimited codes is a fighting game planned by Cavia, developed by Eighting, and published by Capcom. It was released in Japan for arcades on June 11, 2008, and for the PlayStation 2 on December 18, 2008. An enhanced port was released for the PlayStation Portable in Japan on June 18, 2009, and was subsequently released digitally on the PlayStation Store in North America and Europe on September 3 and 10, 2009, respectively.