Saber (Fate/Prototype)

Saber (セーバー) is the Servant of Sajyou Ayaka in Fate/Prototype.

Identity
Saber is an alternate version of King Arthur who is actually male as depicted in the legend.

Personality
From the small amount of screentime given, he seems to have none or nowhere near most of the issues that plague his counterpart, Arturia. He is seen as playful as he teases Ayaka by removing her glasses and smiling at her.

Role
Originally called Archetype Saber, he is the version of Saber that was to be used in the original Fate/stay night novel that was penned and left uncompleted. It was decided during the development of the visual novel that Saber's master, Sajyou Ayaka, was not an ideal protagonist for the target audience, so both Saber and Sajyou were redesigned and had their genders swapped to make them more appealing. He was detailed in Character Material, and has been given an expanded role in Prototype.

He had been summoned to fight in the Grail War eight years prior by Sajyou Manaka, the elder sister of Ayaka. Both he and Manaka had made it to the end however it was at that time that he discovered that she had been making sacrifices to the Grail. Learning her and the Grail's true nature, he called them insane and stabbed and killed his Master before throwing her corpse into the Grail.

He would be called on once more by Ayaka for the current Grail War, being summoned, albeit by accident, in time to save her life from Lancer who had been pursuing her.

During the war, he would be seen as a rival by Archer due to not only being summoned as a higher class than the Sumerian King, but also due to Archer's interest in Ayaka, whom Archer proposes to. Later on he would be nearly killed by Berserker and then corrupted by his Master, Sancraid Phahn.

Abilities
Saber has Excalibur and Invisible Air much like his counterpart. His version of Excalibur is bound by thirteen constraints placed upon it by the, and the conditions must be met in order for the constraints to be released. Against Archer's Enki, its full power was released, allowing it to evaporate the water and bisect the "star of destruction." His version of Excalibur is also more far more ornate in its details, such as bearing a haloed cross in the blade above the hilt.