Lavi 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 it. He works along the Black Order just to be close to the events that must be seen and slowly becomes more attached to his Black Order friends and his original Bookman self is constantly being clouded by his growing care. His anti-akuma weapon, simply named Tettsui and referred to as Ozuchi Kozuchi,is capable of growing and extending to undefined sizes and lengths.