Aisha Neumann is a twelve year old Squad 7 shocktrooper, the youngest playable character in the Valkyria Chronicles videogame.
Aisha also appears as a member of Squad 7 in the Valkyria Chronicles anime.

She earned secondary military training credit at a record age, and was permitted to enlist after expressing a strong will to fight.

She paired the fathomless curiosity and energy stores of a child with impressive physical agility and intelligence. Back home, people called her "Girl Genius."

Over the course of the war, she grew to feel a strong admiration for Captain Varrot, and began reading up on the art of war in order to follow her example.

Source: valkyria.wikia.com