I'm writing a spec TV script that includes a character that can imitate the other characters' appearances at will. When the impostor has dialogue do I use his real name or the name of the character he currently looks like? The storyline makes it clear that he's not the real person, but I want it to be clear to the reader that this is one character imitating different people, not three or four different characters. Hopefully that makes sense. I've never had a script with this issue before.