[Badmash]

When a character uses Morph to imitate another character, what are they imitating? I have a player in my current campaign who has a character with Morph that suspects another character is masquerading as a member of the opposite gender. His plan is to watch that character from hiding and mimic them.

So when someone mimics someone else using Morph, are they imitating the actual person, or what they can see? Would things such as birthmarks or moles that the Morphing character hasn't seen show up as well?