In my fics Fett has two faces: one is the helmet, the hunter, the Angel of Death. The other is the face of the man, the morals, the weaknesses, and everything he doesn't want the galaxy to see. But Fett never sees things this way. To him, he's all one person. And why do I portray him like this? Because it seems to be how he functions. He lets everyone see how scary he is, but it takes a bit of digging to figure out just how the gears in his head work.
As for unmasking Fett, I have the ultimate answer to what he look like! I know how to de-age people in Photoshop, you see. I took a picture of Jango Fett, changed his armor color, and took away all the wrinkles and scars and voila: Boba Fett, 20-odd years old. I'll see if I can figure out how to post it if anyone's interested. Then again, some people just want to wonder.
"There is no greater good than justice," -Boba Fett