When the sky turns black, why do I feel so blue?

My second favorite anime of all time is Tekkon Kinkreet staring the sensational characters Black and White. What I really like about this story is the connection between the two main male characters. The bond they share is the same as ying and yang in a sense. They are children of the street and live by their own rules (see why I like them now). They live like brothers so their bond contains no sexual link, but they're very close, relying on no one else but each other.Black is a particularly interesting character. The more calm and collected of the two, he holds knowledge and strength, blended with a slight hint of insanity. He's the anime worlds Tyler Durden to a certain extent.