Height 185 cm (6'1") Hometown East End A noble, a mathematics professor and the antiheroic protagonist of the manga. He is a genius who attempts to overthrow evil nobles and destroy the class system that has caused misery and pain to the poor everywhere.

Spoiler

He and his brother were orphans who were adopted by Albert Moriarty after noticing his capabilities and his ideals of overthrowing the evil nobility. At Albert's request, he concocts a plan to kill the remaining members of the family and make it look like an accident. After burning the entire manor down, he adopts the name of the one he killed, William James Moriarty. He assumes the position of the second son of the Moriarty household, and lives under the guise of a noble. He adopts the title of crime consultant as he, along with his gang, go around destroying the corrupt caste system from the shadows.