Negative Hollow is not a human character but rather a spectral entity from the anime and manga series One Piece. It is a ghost-like creation used by the character Perona, a member of the Thriller Bark Pirates. When Negative Hollows pass through a person, they inflict overwhelming negative emotions, causing their targets to become instantly depressed and lose the will to fight. This ability plays a crucial role during the Thriller Bark arc, serving as a formidable obstacle to the Straw Hat Pirates.