Eri Kasamoto

An orphan who was abandoned in front of a church, her earliest memory is escaping the church and becoming the leader of a street gang. Her leadership skills were discovered by the Government Forces Intelligence Agency, who gave her special training as a spy. Eri, however, found assassination and subterfuge missions to be heavily distasteful, so she applied to be transferred to S.P.A.R.R.O.W.S., of which she was specially granted considering her ability and deeds. In the Second Uprising, she showed exemplary performance in suppression operations and stopped Morden's Army from executing the uprising. She was promoted to staff sergeant. Eri is also known as the "Memphis Bomb Princess" due to her extensive use of grenades. Source: Metal Slug Wikia