An old man who records the hidden history of the world. He comes from the Bookman clan and doesn't have a name, but simply introducing himself as "Bookman" during his first meeting with Allen. He and Lavi appeared at the same time. He refers to Allen as "The Destroyer of Time" according to Hevlaska's prophecy, as he believes that Allen is the only one who can defeat the Earl of Millennium. Bookman also mentions that a "Bookman" does not put himself in the front-line and he allies himself with the Black Order merely to be close to events that must be witnessed and recorded.
His anti-Akuma weapon is called Heavenly Compass ( 天針 , Heavenly Compass), which is a set of acupuncture needles. In addition to Bookman's own skill in healing people through acupuncture.