Arystar Krory III is a supporting protagonist in the manga/anime series D. Gray Man. He is an Exorcist and member of the European Branch of the Black Order. A baron by birth, he spent a large portion of his life hidden in his grandfather's castle, and was believed by the members of a nearby village to be a "vampire." He was also the lover of an Akuma named Eliade. After discovering what she was, Arystar was forced to kill Eliade in order to free her soul. Initially after her death, he wished to have his life ended, as he believed he didn't deserve to live after murdering the only person who ever cared for him, but was convinced by Allen Walker to become an Exorcist, who believed Eliade's death would have been for nothing if he died.
He is voiced by Mitsuo Iwata in the Japanese version of the anime and Eric Vale in the English version.