トワイス・Ｈ・ピースマン

Twice H. Pieceman was born in born in a place where a war being fought. He was a war orphan and was later adopted by his foster parents. He became a prominent scientist in the fields of advanced neurosurgery in the latter half of the 20th century and pioneered the science of digital hacking and he is thought to be the first Spritron-hacker. He discovered a cure for the disease known as Amnesia Syndrome.  After becoming a scientist, he still risked his life to save others. When he was called to a city to treat victims of the disease he was killed in a bioterrorism attack. His data was recorded by the Moon Cell Automaton and became part of the system. After serving in multiple Grail Wars as an NPC, the constant exposure to the human Masters combining with his skill as a Spiritron-hacker eventually caused his data to become self-aware, and he now exists in the Moon Cell as both a NPC and a Master. 
After becoming self-aware, Twice became a Master and summoned Caster. He went on to fight in countless Holy Grail Wars, but failed to win the war. Eventually he lost Caster and he prayed for salvation until he was given a new servant, Saver. Saver responded to Twice, not because he agreed with Twice's ideals, but out of compassion for his soul. However, once he reached the core of the Moon Cell, he found that, as an NPC, he could not enter the core without being deleted as invalid data. From there, he redesigned the Holy Grail War to the current system and asked each Master who was victorious in the Holy Grail War to wish for the perpetuation of war and the continued advancement of man. However, all the Masters who faced him refused, and thus were killed by him and Saver. He and Saver are the final bosses of the game./