Shape-Shifters are miscellaneous creatures that can become familiars.
When in their natural form, they are amorphous, cloud like, creatures. They are able to read minds and become whatever a person most desires.
Familiars try to tempt people by turning into what they most desire. If a person can resist this temptation, the Shape-Shifter will ask to become a familiar. Even after being Familiarized, they turn into tempting things to meddle in their masters lives.
Shape-Shifters are Utility Familiars. Although they can get the powers of what they turn into, they don't like to fight at all. They will do whatever you ask of them, but in their own ways.