The story's main antagonist. Also known as "the Earl of Millennium." He tricks people with dead relatives and friends into creating Demons (Akuma). He is a sorcerer from long ago, and he plans to lead the world to its destruction. Sometime in the past he formed an alliance with the Noah Clan, who call him "Duke Millennium"(Except Road who calls him Millenie). Hoshino says she based the Earl of Millennium off a legendary alchemist/preacher (most likely the Count of St Germain or Nicolas Flamel, though in many ways he also reminiscent of Dorian Gray, possibly referenced in "Dorian Grey man" and thus "D.Gray-Man," as adapted in the film The League of Extraordinary Gentlemen) whose tale even claims he still may be alive somewhere.

In appearance, the Earl resembles a grotesque caricature of a Victorian gentleman—a rotund figure in cape and top hat, with an enormous grin that remains fixed even when he is speaking and even eating, and his eyes permanently hidden behind a pair of pince-nez spectacles. In the manga, almost every one of his lines of dialog ends with a heart. In the anime, he invariably uses polite Japanese. Throughout the story, he displays two different personalities. The first is his normal cheerful, friendly, and happy attitude, almost like a friendly old uncle. With the Noah, he's a member of the family, and is particularly playful and affectionate towards Road. His other personality is one of sheer, sadistic malice, capable of happily playing with people's lives.

He wears a different hat in each encounter, each with a different decoration. In a gag comic in Volume 2 of the manga, he is shown taking off his hat, and having another set of ears. His main form of combat involves his umbrella Lero. He has also shown the ability to create massive explosions of dark energy. The Earl is also able to summon a large black sword that is the opposite of Allen's Crown Clown sword.