A presumably historical Sumerian king, whose life became the subject of the classic Epic of Gilgamesh.
As a specific character tag, used to refer to the character from the Fate series voiced by Seki Tomokazu, who is the heroic spirit of the legendary King. Identifying as a demigod and the 'King of Heroes,' he possesses the appearance of a blonde, red-eyed man in golden armor. Some appearances depict him without his armor, revealing his toned body.
In the Fuyuki Grail Wars, he is originally summoned by Tohsaka Tokiomi during the fourth Heaven's Feel. Following his death, he formed a contract with Kotomine Kirei, who helped him take measures allowing him to survive into the Fifth Grail War.
While the Fuyuki Grail summons him into the Archer class, his existence in the Moon Cell is unable to be constrained by class.
He is enamored by Saber for her beauty and noble spirit, her continual refusal of him only compounding his obsessive desire.
In Fate/hollow ataraxia, he takes a magic potion to become a younger version of himself, and in Fate/Grand Order, he becomes an ally and playable Servant as the Wise King of Uruk under the Caster designation.
- Type-Moon wiki (spoilers): http://typemoon.wikia.com/wiki/Gilgamesh
- Wikipedia article: http://en.wikipedia.org/wiki/Gilgamesh