Luke’s childhood friend, Biggs Darklighter, was a big influence on him. He was the friend that got away, joined the Academy, and did something with his life, leaving Luke at home on the farm. Luke longed to be like his friend. He wanted off the farm and to have his own adventures. He got them all right. The relationship between Biggs and Luke was quite lost in the final film, however. There are casual mentions of Biggs and another friend Tank. There’s the short reunion with Biggs during the end battle. That’s about the extent of it, though. Biggs’ missing scenes fill in a lot of those blanks in Luke’s backstory.