Nea D. Campbell

""I'm the one who will destroy everything, the 14th Noah - Neah""

Neah Walker, also referred to as "The 14th", "The Pianist" and "The Musician", was a traitor and disowned member of the The Noah Family. He is the younger brother of Mana Walker and the adopted uncle of Allen Walker. He was the only individual, besides the 9th of the Noah Family Road Kamelot and The Millennium Earl, who is able to control Noah's Ark. His true name was recently revealed to be Neah, though it is not known if that is his human name or his Noah name.

History
Before the events of the main series Neah had, to become the new patriarch of the Noah Family, attempted to stop the Family and Millennium Earl's plan to wipe out humanity, this betrayal included his attempted murder of the Earl himself and nearly succeeded. However the Earl came out as the ultimate victor, barely surviving his encounter with Neah. However unbeknownst to the Earl and the other Noah, he passed on his memories to Allen Walker. Sometime prior to his death, he had requested Cross Marian, to watch over Mana, promising that one day he would return from the dead.

Almost nothing has been revealed as to Neah's nature or history. It is known that he was the younger brother to Mana Walker. It could also be inferred from a conversation with Waizurii that Neah was not an original Noah family member, as Waizurii can use his Demon Eye to search his previous incarnation memories, and there were only thirteen Noah family members at the beginning.

It is revealed that Tyki Mikk's appearance is exactly what Neah used to look like (according to Road Kamelot, Waizurii and Allen Walker). Also, it is hinted that The Earl and Neah used to be close friends (The Earl's memories about Neah telling him that he "would always be by his side").

Although the exact time is unknown, it is also said that he implanted his memories in Allen before he died. It is speculated by the Black Order that he chose Allen because Allen was an accommodator of a powerful Innocence.

Noah's Ark Arc
His memories appear to Allen as a portly musician with an eerie black face with no features, other than eyes and a mouth. Neah also has wings in some pictures of him. Neah speaks gently to Allen in their encounters, and seems to mean him no harm, despite the fact that it is implied that someday he will consume Allen's body and be reborn. It is also apparent that the 14th's will is to gain revenge against the Millennium Earl upon his rebirth. No motive has been given as to why Neah betrayed the Earl, nor who exactly the human he gave his powers to is. It is also unknown what sort of supernatural power he possesses, besides the ability to control the Ark.

Phantom Thief G Arc
When Allen is almost killed by a level 4 Akuma, the Akuma sees the 14th Noah inside of him. At first, this is represented by Allen looking calm and smiling in a Noah-ish manner, but shortly after he seems to become a monster reminiscent of a flaming skeleton.

Third Exorcists Arc
In chapter 184, Allen seemed to be temporarily taken over by Neah after he awoke from his dream. During that time, Allen gave an angry-looking ominous expression, and looks down, probably at Timcanpy, before Lenalee Lee's voice brings Allen's conscious back.

It is revealed that Neah's reason of trying to kill the Earl was that he wanted to be the Earl himself. In chapter 189, as the Earl pins down Allen and reveals that he knows that Allen is the 14th (he says Neah "called to him" through an Akuma), Neah awakes in Allen and confirms this. He then goes further by calling the Earl "brother" and tells him that he's going to kill him to become the Millennium Earl himself.

Later, when Yu Kanda accidentally nearly frees Neah, Neah tells Allen that the Earl is nothing more than a puppet to destruction like Allen is a mad puppet (possibly referencing Allen's obsession with saving humans and akuma) and how he'll end it all by destroying the Noah. However during the attempt, the barrier that has been sealing Allen's left eye is broken by Timcanpy, an image of Mana saying "Allen" appears in his mind, and stops Allen from being eroded by Neah.

Natural abilities as a Noah
As a Noah, Neah has command over the Akuma. Even after his betrayal and demise, he seems to have retained such authority, as when he resurfaced in Allen, the Level 4 Akuma that tried to kill them froze in terror, realizing that its target was a Noah. As with all Noah, his abilities were based on Dark Matter, and he could destroy Innocence with a simple touch. As a Noah, he is immune to the Akuma blood virus, which is normally fatal to the humans touch. The 14th was powerful enough to match the Earl in combat for a time and almost kill him.

Allen Walker
Before he fought the Millennium Earl and the Noah Family he implanted his memories inside Allen Walker. When Allen used the Sword of Exorcism to stab through himself and the Level 4 Akuma together, the blade also hurt Allen, causing Neah to resurface.

It appears Neah is gaining more control over Allen's body. After he awoke in Allen to speak with the Earl, Allen retook control of his body, although he began experiencing the sensation of his body disintegrating as Neah's control grows stronger. In chapter 197, Kanda stabs Allen thus causing Allen's skin tone to change into that of a Noah's.

The Pianist
He is also one of the three members of the family that have the authority to control the ark, the other two being Road and the Millennium Earl. In fact, he has a secret room in the ark that contains a second piano (which serves as its heart) that none of the other Noah family members, even the Earl, knew about.

Trivia

 * It has been noted by several characters that Neah looks strikingly similar to Tyki Mikk.
 * He is the creator of Timcanpy.
 * In D.Gray-Man Reverse 3, It is implied that Neah has red hair.