Lavi (ラビ, Rabi?) is a cheerful 18-year old red-haired Exorcist of mixed race. He aims to become a Bookman, a person who records the hidden history of the world, and has been trained from a young age to achieve that goal. Lavi is the 49th alias he assumed after casting away his real name to reach that goal. He works along the Black Order just to be close to the events that must be seen, but slowly becomes more attached to his Black Order friends, and his original Bookman self is constantly being clouded by his growing care for them.
Text from wikipedia
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