Tohsaka Sakura, Rin's younger sister...
I suppose I should write something here?
Well, of the Type-Moon works, I like the Fate stuff more than the Tsukihime stuff, though what interests me most is the whole Type-Moon universe and how everything connects.
Admittedly, the original Fate/stay-night doesn't quite appeal as much as the spinoffs - Fate/zero (AWESOME), Fate/Extra, and Fate/Prototype. I blame Shirou - I like the heroines and the three routes well enough. It's just... Shirou. =(