You can change your shadow to be a replica of a single person that possesses all the abilities, skills, and knowledge of the subject. You have complete control over it and can utilize the replica to be indistinguishable from the original. It can even pretend to be a real person.
The phantom can swap between chosen forms freely, but they must be real. The phantom cannot be larger than your own shadow. For the duration of the Phantom's existence, you no longer have any shadows.