L, the great detective of all time. He has a high level IQ. http://i720.photobucket.com/albums/ww206/omegaitachi/Decorated%20images/LifeSucks.jpg
Somewhat cocky, but very smart. Is a detective, and has an IQ higher than any other humans.
None...
L was discovered by Quillsh at age 8, after Quillsh discovers L's IQ to be higher than any other persons in the world. His parents were dead, and his mind was only being used on the streets. Quillsh took him to one of his orphanages and raised him there, where he became the worlds greatest detective.