Doppelganger

Doppelgangers are monstrous humanoids, infamous for their shapeshifting abilities that allow them to mimic almost any humanoid creature. They are lazy but cunning creatures, who kill or dispose of people then assume their place. While not downright evil, doppelgangers are extremely self-centered and liable to look down on their victims. They are believed to be an artificial race, created by the Creator Race known as the batrachi. They have a fondness for working with the magically inclined; mainly being used as assassins or in elaborate plots to usurp power.

Doppelgangers are feared for their ability to assume the form of any humanoid creature they encounter. Doppelgangers are used as spies and assassins by many beings all over the world.

Many doppelgangers live a stolen life. Should they encounter a person whose appearance or station they desire for themselves, the doppelganger will use their mental powers to learn everything they can about the chosen target. Once they have all the knowledge they need, they will quietly eliminate their target and assume his or her form, taking their place in life.

Physical characteristics
In their true form, doppelgangers appear as tall, elven, gray-skinned humanoids, whose thin bodies make them appear, to human eyes, sexless. Even this form is deceptive, suggesting they are physically weak, when in fact they are quite strong and agile. The normal appearance of a doppelganger is that of a gray-skinned humanoid with a formless face and pale white eyes. They have no hair in their normal form.

Culture
Doppelganger families tend not to be close; usually a male and female meet, engage in casual sex, then leave one another, with the female being forced to single-handedly rear any resulting newborns—who will leave their mother upon reaching maturity. Some however, form tightly knit family clusters, while others will mate with humanoids, taking malicious delight in using their spouse as a cover for their inhumanity. Children born of such unions have a chance of being a half-doppelganger.