Do you agree that "Who is you" and "Who are you" mean different things? I hear some say that "Who is you" is wrong. But why is it wrong?
Who are you? - "Who" is focused on the qualities or capacities inherent in "you"?
Who is you? - "Who" is focused on other entities/people among whom there is you.
What do you think of "who is you?" Can it be used?