Who is mr behrman the last leaf?

Behrman is a person who wants others to be happy. Although when for the first time sue told him about Jhonsy's fantasies about the leaf he reacted very badly but to give Jhonsy moral support which can be provided to her by preventing the last leaf from falling he risked his life and painted a picture of the last leaf on the opposite wall in the terrible cold weather. he is a down to earth person and a gem in millions.