I claim Izayoi Sakuya from Touhou Project as my waifu.
Ah, the perfect and elegant maid. Reminiscing my first experience of playing Touhou, she was my main reason why I keep trying to play it even though I suck at bullet-hell-shooter-type-of-game. My interest toward her grew, into the extent that I could read her entry in wiki.net uncountable times. The more I read, the more I want to know about this enigmatic perfect maid since all of her background-story is shrouded in mystery... I just simply want to know her, to know what she hides, to know her reasons, to all around her.
That curiosity leads me to like her. I might have another touhou favorites, but for reasons above, she is always at the top, in the place where nobody can reach her.
Say, Sakuya, let's go for a ride together; I've been waiting for this time.