Mahoro Andou

Mahoro is an android created by Vesper to fight an alien invasion by Saint, and proved to be quite quick and powerful, making her strong enough to destroy her enemies. After fighting successfully for Vesper with her great and powerful fighting skills, she is given an option to do what she wants with the rest of her remaining 398 days to live, as she had a limited life span. She decides to become a maid to Suguru Misato, who is the son of her superior officer who Mahoro reluctantly killed (out of his command) when she had to kill an alien that was taking him hostage.