L

L

L is the world's three top-rated detectives (through two additional aliases), tasked with tracking down and arresting Kira. As such, he is Light's principal nemesis. His disheveled appearance masks his great powers of deduction and insight. L has many quirks, such as sitting in an odd manner (he squats on the edge of his seat, with his knees up by his chin), snacking on sweets in the middle of meetings, and holding his cellphone and other objects in a peculiar manner. He often takes drastic strategies to confuse and force his opponents, and on several occasions he has willingly disclosed several of his weaknesses to Kira at the risk of his own life in the hopes that he would lure him into a trap.

(information from http://en.wikipedia.org/wiki/Death_Note)