Fire Emblem: Eirika
Princess Eirika is the daughter of King Fado of Renais and the younger twin sister of Prince Ephraim. Kind, forgiving, and gentle, Eirika is pacifistic and will often try to avoid fighting. However, she will fight if she has to, as she is trained in the art of the sword, but mostly to protect those who are important to her.
As one of the two Lords of Sacred Stones, if Eirika falls in battle, it's a game over.
*See first comment for additional notes