Rin Tohsaka.
She's a kick-ass mage, probably the best the century has seen.
She's the single living successor of an estabilished and accalimed - although 'quite new' by mage standards, a 'mere 200 years' - mage family. While duirng the day she acts pristine and is miss honour student, the few people close to her are allowed to see her tomboyish side along with her pricklish sense of humour.
She aspires to be the best at everything, so she does the best and only the best she's capable of and demands others to do so as well. While she resents the sacrifices in her past she's also fiercly competitive, ready proove her worth anytime. Usually she acts reserved and tries to always do the cool headed logical thing. However in the end she can fudge up things in the worst possible moment. Her most endearing quality though is her tendecy to in spite of all the bragado and cool do the right thing by her hearth and put everything she's sought on the line for a mere gesture of humanity.
When angered she puts you down with such a English charm, ('insulting you by complimenting your lack of finesse') that makes you apreciate Han Solo's proverb: "No reward is worth this!"....This is a walk in the park though compared to what she will dish out when she actually likes you! Calling her a tease is the understatement of the year.