Slim is described as a “big tall skinner” and is an important person on the ranch. He seems to be fairly impressive to Curley’s wife, and there are even rumors of an affair. The whole ranch looks up to him and respects him.
Slim does flirt with Curley’s wife, but not in a serious way. He seems to be on to her games. He is talented and well-respected. Physically, he is tall and has long, black hair and an ageless face. He moves “with a majesty achieved only by royalty and master craftsmen” and “his authority was so great that his word was taken on any subject, be it politics or love” (ch 2). In addition, he is very intelligent.
His ear heard more than was said to him, and his slow speech had overtones not of thought, but of understanding beyond thought. His hands, large and lean, were as delicate in their action as those of a temple dancer. (ch 2)
Slim is philosophical, and immediately takes an interest in George and Lennie.
Slim looked through George and beyond him. “Ain’t many guys travel around together,” he mused. “I don’t know why. Maybe ever’body in the whole damn world is scared of each other.” (ch 3)
Slim is practical, intelligent, and dignified. George and Lennie see him as an ally right away, especially in their combat with Curley. George trusts him enough to confide in him and tell him some of their story. He also assists them when Lennie does get into trouble with Curley, and later with his wife.