EMIYA (Archer) is the future self of Shirou Emiya. He formed a pact with the World (Alaya) to become a miracle-producing hero. His wish to rescue 100 humans led him to become a Counter Guardian post-death, tasked with halting humanity's self-destruction. This contract is crucial as it outlines his role and existence in the Holy Grail War. However, in the Fate/EXTRA universe, Archer contracts with the Moon Cell, transforming into a 'hero of justice' Heroic Spirit.