The element that is most likely to be featured in a work of realistic fiction is "well-defined character suggested by actual experience." This would provide the most realistic character.
The Water is Wide is the true story of a young white schoolteacher -- a man who gave a year of his life to give an island and a people renewed hope. He becomes the teacher to their children, and teaches the adults of Yamacraw Island extraordinary lessons they didn't even know they needed to learn.