Trueman, also known as Mr. T, is a mysterious character that appears in the fourth season of Yu-Gi-Oh! GX.

As the powerful and mysterious "Messenger of Darkness" who vows to destroy those who try to figure out his agenda, Trueman serves as a main antagonist of the fourth season. However, it is later revealed that he is a herald of Nightshroud, the true mastermind behind the vicious siege.