Twice H. Pieceman

The Master of Saver, and the primary antagonist of Fate/Extra. At the conclusion of the seventh battle, he can be found at the core of the Moon Cell.

Peaceman was a prominent scientist in the latter half of the 20th century, and pioneered the science of digital hacking. Killed in the terrorist attack occurring some thirty years prior, his data was recorded by the Automaton and became part of the system. Though a pacifist by nature, his constant exposure to war and the evils of mankind caused him to develop a mental illness. Twice hates war and cannot forgive it, but at the same time believes that humanity requires war to advance and evolve. This dissonance caused his data to become self-aware, and now exists in the Moon Cell as an NPC. To him, the Holy Grail War existing within the Moon Cell is a microcosm of the constant bloodshed that transpires in the outside world. The participants slaughter one another in the hopes of having the Grail grant their wish, all the while feeding information to the Automaton. Peaceman accepts this as survival of the fittest and believes that such a process is essential for humanity.

Therefore his request to you, the victor, is to wish for the perpetuation of war and the continued advancement of man.