Mimeoform. 

• Your creature type is Shapeshifter. You have a natural form, which is a featureless, mannequin-like humanoid. 
• You can perfectly mimic the physical appearance of humanoids that are the same Size as you. Your equipment, stats, and abilities do not change, but your mimicry is imperceptible by anything short of magical means.  
• To learn a form, you must study the original person from no more than 30 feet away for 1 minute. 
• You can memorize 4+your Character Level different forms in addition to your natural form. If you are at your limit, you can choose an old form to forget. At level 1, you start knowing three forms from your past.
• You can use 2 Actions to shift between forms you know.
• You can use one Free Action per Round to mildly distort a feature (such as making your eyes bulge or teeth grow), which reverts to normal after a moment.