When Heartless are created, the body and soul of those with strong hearts that have lost their hearts to darkness become another type of creature called . As they lack hearts possessing light and darkness, they are "nothing", yet still exist within the "Kingdom Hearts" universe. Despite this, Nobodies have the potential to gain new hearts of their own through time, separate from their original selves. Nobodies typically assume malformed, inhuman shapes; however, the members of Organization XIII, a group of Nobodies central to the plot of the series, keep their human forms because they possessed strong hearts as humans and thus remember their original existence. Most members of the Organization control one type of Nobody suited to their fighting style.