For the sake of her deceased father and her family's name, Rin seeks to obtain the Holy Grail, though she has little personal desire for it. Unbeknownst to her sister Sakura, Rin feels guilty and believes that she has abandoned Sakura after she is adopted into the Matou household, so much the guilt was what driven her to revive Shirou, Sakura's target of affection, at the brink of death. In private, she is notably loud, shrewd, stingy and bossy, but usually means well for those she cares about. 

Best GIRL!!!!!!