Jack the Ripper

ジャック・ザ・リッパー

Jack the Ripper, the Legendary Serial Killer (伝説の連続殺人鬼), is an Assassin-class Servant and one of the main characters in Fate/Apocrypha.
She is a young girl who embodies contradiction itself, combining the dual natures of "day" and "night." She speaks in a childish manner, yet she is truly quick of thought. Rationality dominates her behavior, but her psyche has many inherent weaknesses. Her personality is both pure and cruel, and she tends to repay cruelty with cruelty and benevolence with benevolence. Her psyche is inherently broken, and mistreatment may cause irreversible deterioration. Although she needs to feed on human souls to maintain her existence, she claims she will only eat evil people because their souls "taste" better.