[johnthebaptistmoore]

“Tabla Rasa” would be my pick.

[dr_lew]

... “tabula rasa” ( sorry )

I was going to say “cipher”, in the sense that he stands for nothing, or that nothing can be known of him.

[Redbob]

"“Tabla Rasa” would be my pick."

Stick with "blank slate" if it's easier for you to spell.

[gulfcoast6]

FALSE PHOFIT!