Reptilicant
A peron exhibiting artificial intelligence replicant and chameleonlike abilities. A human capable of blending seamlessly into any environment, much like the reptile. This type of person usually has no true identity and assumes one based upon their environment.
Angel was such a reptilicant! I would never have guessed what kind of past she has led! She never appeared anything like that. I thought I knew her. Bitch.