Alter Ego (Fate/KOHA-ACE)

Alter Ego (アルターエゴ) is a Counter Guardian appearing in the Strange Tales of the Imperial Holy Grail of Fate/KOHA-ACE. She is also a Servant able to be summoned by Ritsuka Fujimaru in the Grand Orders of Fate/Grand Order. There is also a parody form known as Devil Saber.

Identity
Alter Ego's True Name is (Alter) ((オルタ)), also known as Okita Alter (沖田オルタ). She is a Counter Guardian formed through Sakura Saber's spiritual foundation taking in a Holy Grail filled with Seven Servants and being supported by the Counter Force.

Appearance
Devil Saber appears as a young woman with long white hair, tied back at either side with red tassels. She wears a red and black dress bearing similarity to a short kimono and long European style coat, complete with high collar held closed by a rope tassel. She appears to wear long stockings.

Personality
Devil Saber is more emotionless than normal due to her support from the CounterForce, but her roots as Okita remain the same. She takes on a "hitman attitude that will kill anything."

Fate/Koha-Ace
As Sakura Saber, Demon Archer, and Lancer face Caster and the Neo Fuhrer, they find themselves unable to defeat it. Archer kills Lancer, tells Saber to use the Grail, and then dies herself. Saber takes the Grail into herself and becomes Devil Saber. She then defeats Caster and the Neo Fuhrer. Okita returns to normal after and brings a small Archer back with her.

Abilities
Devil Saber possesses twelve special moves.
 * Eternity Three Stage (無穹三段), a move firing "infinite light" that defeats Maxwell's Demon and the Neo Fuhrer, blowing away its very concept.
 * Purgatory Sword (煉獄剣), "a cool black katana."
 * Furthest Earth (極地), "a mysterious dimension maneuver."

In her parody role, she has a great advantage over characters representing the Fate franchise.