The 14th, also referred to as "Pianist" and "Musician," and is the "Noah of Destruction" was a disowned member of the The Noah Family and the younger brother of Mana Walker. He was the only individual, besides the First Child 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 'Nea,' though it is not known if that is his human name or his Noah name.

(Source: D.Gray-man Wikia)