John Dunbar is a fictional character from the movie Dances with Wolves, portrayed by actor Kevin Costner. He is a Union soldier during the American Civil War who becomes disillusioned with the conflict and seeks a new life on the frontier. His journey leads him to a remote outpost where he encounters the Lakota Sioux tribe, forming deep connections with them and learning their ways. As Dunbar immerses himself in the Lakota culture, he transforms from a soldier into a bridge between two worlds. His experiences challenge his beliefs and ultimately redefine his identity, highlighting themes of friendship, understanding, and the clash of cultures.