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L Lawliet, commonly referred to by his alias " L" , is a fictional character in the manga, anime and film series Death Note. L is considered the world' s greatest detective, whose identity remains unknown before the story takes place because he has never revealed himself to the public. L takes on the Kira investigation in the first arc. The character of L is portrayed by Ken' ichi Matsuyama in Death Note, Death Note: The Last Name and L: Change the WorLd.