Reed Richards is able to stretch, deform, expand, or compress his entire body or parts thereof into any contiguous shape he wants. Due to this he is able to more or less change his features (though not as well as Mystique).
As quoted from this well-written Marvel Wiki page:
- Shape Changing: Mister Fantastic can stretch, deform, expand, or compress his entire body or parts thereof into any contiguous shape he can imagine for a variety of uses:
- Imitation: Mister Fantastic may alter his basic physical features, allowing him to take on the appearance of any other man with similar hair and skin tone.
Has Mister Fantastic ever used his elasticity to impersonate someone?
I read somewhere that Reed had impersonated his mailman of some sort (would like a confirmation of this happening). Other than this, has Mister Fantastic ever impersonated anyone (else)?