ダンタリオン

A demon possessing one mind, yet a great multitude of bodies, earning him the nickname of "Legion". His bodies number in the millions, but while they all stem from the same roots, Dantalion's corporeal manifestations nonetheless function as separate entities, birthing a peculiar sort of inner disparity within the group. They have been charged with the maintenance of Pandora's library, said to contain every single tome from all existing worlds. Due to the sheer amount of volumes present in the library, they have only just about recently finished sorting through two thirds of the entire collection... Incidentally, the differences between the psyche of individual corporeal manifestations can grow as wide as to divide their preferable roles in romantic relationships. [Source: MangaGamer]