The Night Circus/WMG

World Mass Guess

 * The man in the grey suit (A.H) is actually  when he meets with Widget at the end, Widget can see he has an extraordinarily long past and the man in the grey suit insinuates that he used to be a romantic but has lost interest in things hinting that it did not go well for him, which fits in the  . If he's been competing with Hector Bowen for a truly long time, that might place Hector as someone important too. They both founded their schools of magic/thought.
 * It could be Hector who acted as.


 * Alternatively, A.H is slenderman . After all, The only things noted about him are that he's outlandishly tall and wears a dark suit.