Identity of A H

Mr. A.H., or the man in the grey suit, or even "Alexander," is a magician. Unlike Prospero the Enchanter, he doesn’t perform on the stage. He is the most mysterious character of the story. Alexander appears when he wants and leaves when he wants. Alexander is neither good nor bad: he is neutral, just like the color of his eyes and the costume. He chooses Marco as his competitor for Celia; Tsukiko was his last student and she won her contest.