Which character in "In Another Country" can be considered the Hemingway hero, and why?

Of course it is Nick. In the story, In Another Country the reader realizes that Nick Adams is honest, virile, and, more important, a person of extreme sensitivity. By observing the particular state of mind of the young narrator at the beginning of the story, we see that what happens to the major makes a tremendous impact on the young, wounded soldier. He is the Hemingway hero because of his virility and honesty and especially his sensitivity.