Fate Staynight
Rin Tohsaka

7
Two centuries ago, the Tohsaka House, in collaboration with the estates of Makiri and Einzbern, helped found the Fuyuki Holy Grail Wars. The land of Fuyuki City, which possessed the second greatest spiritual power in all Japan, was owned by Rin's ancestor, Nagato Tohsaka; at the behest of the Einzberns, he provided his property as battleground for present and future wars. Nagato was a kirishitanWP, as well as a pupil of Zelretch; these titles gave him considerable influence in both the Mage's Association and the Holy Church, allowing the Tohsaka family to participate in the Holy Grail Wars, free from harassment by either organization.
Rin is a perceptive, serious, resourceful, and very competitive person. Though she is widely admired at school as a prim and proper honor student, it is a front she puts up in order to prevent others from prying into her life. In private, she is notably loud, shrewd, stingy, and bossy but usually means well for those she cares about. She is known as a model student and idol of her school. Her manner of speech is often hostile and dismissive of other people, but deep down she has a caring, big-sisterly disposition. Her tendency of making trivial mistakes at the worst possible moment is a hereditary curse. Though she really is a lot nicer than she seems, she claims to always make her decisions based on cold, rational logic in the end. In her own words, it's "not a very cute personality". During her childhood, she understood the Fourth Holy Grail War about as much as Shirou understands the Fifth, seemingly understanding while not actually comprehending it. She saw her father as a great magus who must be respected and loved, but failed to understand the negative aspect of his personality, the coldheartedness that accompanied such an ideal. If he had lived until Rin could actually understand his personality, it is likely that it would have greatly affected the development of her own personality.