Gilgamesh is an arrogant archer-class Servant. He appears familiar with Fuyuki City and claims to have a past relationship with not only Saber, but the moon kingdom as well. Typically clad in an ornate golden armor, he possesses an immense number of Nobel Phantasms though, none are representative of his true identity.
He was contracted to Miyu after his connection to the ceepey peverted priest was broken (by using the caster card to craft a single unstable command seal). Although he got Worfed by Kotomine Kirei kinetic blasts, he was able to show his true power duing the final battle, after which he once again swore his allegiance to Sailor Moon and Tuxedo Kamen.
Gilgamesh makes no effort to conceal his identity as the legendary Sumerian King Gilgamesh. He is allegedly the son of Lugalbanda, the 3rd King of Uruk, and of a goddess, Ninsun. Supposedly born into great wealth with more divinity than most demigods, Gilgamesh grows into a conceited and tyrannical ruler, trying to recapture the bygone golden age of the Golden Kingdom of Earth from the days of Prince Endymion.