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info taken from here: darkerthanblack.wikia.com/
Contractors are individuals who have gained superhuman powers due to the appearance of the Hell's Gate and Heaven's Gate. The existence of Contractors is kept a secret from the general public by most governments around the world, but they are well-known to the higher echelons of society and in the criminal underworld. Contractors possess two other traits that give them a rather sinister reputation: the need to perform Obeisance, which is a bizarre, obsessive compulsive "payment" for the use of their powers, and a generally pragmatic, logical world view. This is described by the Contractors themselves as a lack of emotion in general, but not much evidence exists to verify this claim. Many Contractors exhibit at least some forms of emotion, including love, joy, guilt, and sorrow.
Info on Dolls.
Dolls are emotionless "mediums" created to mimic the forms of humans.
Dolls can form a variety of functions; the most commonly seen in the series is their use of observer spirits, which serve as reconnaissance. Dolls have different mediums through which they can send their observer spirits and must be in contact with this medium while observing. A Doll can also act as the perfect sleeper agent. It can be given the memories and personality of another person and assume a person's personality perfectly, mimicking all their habits, dreams, and feelings until the time is right. This suggests that Dolls, can go beyond their "set" characteristics and become something else