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is an Exorcist and former member of the European Branch of the Black Order and the host of the former Noah, Nea Walker. He is the adoptive son of Mana Walker and the adoptive nephew of Nea Walker. He was also former apprentice of former exorcist general Cross Marian.

History
Before the start of the series, thirty-five years ago, a matured Allen stands in front of an dying Nea Walker a former Noah. Allen told Nea that he will protect his memories until he awaken.

Allen was abandoned by his biological parents because due the "deformity" of his left arm, which was later revealed caused by his Innocence. Allen was found and adopted by a travelling performer, Mana Walker, on Christmas Day. Some time later Mana died, and Allen, tormented with grief and manipulated by The Earl of Millennium,, turned Mana into an Akuma, hoping that his beloved surrogate father would be fully resurrected. But the Mana Akuma cursed Allen and sliced through his left eye, leaving the "Pentacle" -- the mark of the Akuma—which scars the left side of his face. This enabled his left eye to see the souls trapped within the Akuma from then on. It was at this same moment that Allen's left arm first invoked as an Anti-Akuma weapon, which instinctively destroyed the Mana Akuma. During the course of this traumatic event, Allen's hair turned from red (brown in the anime) into a stark white.