One of the descendant Noah and a follower of the Millennium Earl    Another descendant of Noah who's assigned to kill Froi Tiedoll (the General being escorted by Kanda and Marie) who has also come to Japan. Skin was first shown in the early manga where he showed disgust at the Earl's dinner, saying he preferred sweets over a hard-boiled egg. He got so angry over dinner that he destroyed the Akuma who prepared the meal with his bare hands and then began to grow large spikes from his arm and back where his skin had peeled off. Because of this, Tyki always calls him &quot;Sweet Tooth&quot; instead of his real name.    In a flashback, it is discovered that he worked in New Orleans at the docks three years before the story of the manga. During this time, he exhibited the Noah's genes which allowed him to recall the 7000 years old memories of Noah causing him great pain and nightmares. It is then that he declares that he will never &quot;forgive it (the Innocence)&quot;. The rage of Noah was transferred into his body and he saw the state of the world from perspective of the Millennium Earl. In addition to recovering these memories, he meets Road and the Earl, who gives him his first taste of candy to stop him from biting his fingers in pain.    He represents the &quot;hatred&quot; of Noah and since he comes from New Orleans, it is assumed he is American.  

A born exorcist, Walker's primary anti-akuma weapon is the cross that's embossed on his red, disfigured left hand, which contains Innocence. But not only does Walker destroy akuma, he sees the akuma hiding inside a person's soul! Together with his fellow exorcists fighting under the command of the Black Order, Walker leads the battle against the Millennium Earl, the evil being out to destroy mankind.
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(Source: Viz Media)

Towards the end of the 19th century, Allen Walker officially joins the organization of Exorcists that destroy the beings known as Akuma; mechanic weapons made by the Millennium Earl with the suffering souls of the dead. Allen has both a cursed eye and an anti-Akuma weapon as an arm, bearing the power of "Innocence", a gift given to him as an apostle of God. Allen, along with his fellow Exorcists must put a stop to the Millennium Earl's ultimate plot that could lead to the destruction of the world and all who live on it.

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