Saber (セイバー, Seibā?) is a Saber-class Servant summoned by Koharu in "After" the Holy Grail War in Fate/Requiem. Koharu and Saber were noted as being undefeated prior to the beginning of Fate/Requiem.
Saber's True Name is Galahad (Alter) (ギャラハッド (オルタ), Garahaddo (Oruta)?). The Riedenflaus family tried summoning the regular Galahad but failed, and ended up summoning Galahad Alter instead. This version of Galahad is the Heroic Spirit whose memories are incomplete and voluntarily gave up his journey to seek the Holy Grail halfway.
Galahad's skin is incredibly pale. In his casual clothes Galahad wears an indigo dress shirt rolled up to the elbows, unbuttoned at the collar to reveal his chest. He wears black skinny jeans and his hair is tied into a rough ponytail that cascades down his back.
Saber has a snarky attitude and teases his Master.
His second sword is his proper Noble Phantasm, but Galahad currently refuses to use it. Since Koharu's Command Seals and Magic Circuits have been damaged by Nzambi's curse, Galahad does not want to harm his Master by activating it.