Howard X Miller

Howard X Miller, known in Japan as X (エックス, Ekkusu) is Sartorius' lawyer, who dreamt of becoming a pastry chef when he was a child. In the Japanese version, he is a Pro League duelist associated with the Society of Light who has a higher ranking than that of Aster. He successfully reduces the cards in Jaden's deck to zero, but ironically loses when he's unable to draw due to the effect of the Neo-Spacian Glow Moss Jaden summons on X's field, causing him to discard his deck.

Voices/Mannerisms
In the English dub, his voice seems to be a parody/homage to Paul Lynde (Somewhat Similar to Escargoon in Kirby Right back at Ya!). His name is meant to be a pun in English, as mill (a term borrowed from Magic: The Gathering) denotes a direct disruption of a player's deck.

Deck
Howard plays a Deck Destruction Deck. His strategy relies primarily on Monster Register, a card that, under normal circumstances would effectively demolish the decks of both players. X, however, cleverly protects himself with the ability of Trap Sluzer, while rendering himself almost untouchable to its effect. In addition to it, Howard also has a wide array of Spells and Traps that stalls his opponent.