Majin Saber.

Okita Souji Alter, an existence brought into being through prayer, destined to end in instability, an explosion to decide the ends of both her, and her adversaries in the hear of battle...

Such a life would be mortifying for most others, but for Okita, it's something that makes her time living all the the more valuable. If one's purpose is to end spontaneously akin to a candle close to being extinguished, she'll ensure that wick to burn as slowly as possible.

The halls of Chaldea are as simple to navigate to you as ever, with the sights of fellow staff, other Servants passing you by. Hearing that your Summon has been answered, the Servant in question walks to you, with a large katana held low. She looks almost exactly like Sakura Saber, albeit her attire, skin tone, nearly everything of her palette is different... She formally bows, and addresses you, introducing herself, her voice having a cold, neutral edge to it...

Okita: "I am Majin Okita Souji, manifested here, to answer your summons... Until this body's smashed apart, let us fight together... Master."

After her introduction, a voice comes from the hilt of her sword... A deep and masculine voice, as the blade faintly glows under the scabbard.

Rengoku: "And I am Rengoku, here to fulfill the same wishes as my Wielder. Let us fight together, lest we live the rest of our days in sabotage of precious time. We are at your beck and call... Master."