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Slim 

Slim is the "prince of the ranch." He’s the consummate Western male: masterful, strong, fair-minded, practical, non-talkative, and exceptionally good at what he does. He is a god among men, and his word on any subject is law. He decides who is wrong and right, who’s been naughty, and who’s been nice. The other men recognize his superiority and never question his actions or decisions. Slim is also sensitive, but not overly so. He is the only one who understands George’s affinity for Lennie, and also the only one to understand George’s final act for Lennie.

Slim represents the cool justice of the ranch world. While life isn’t always going to be pleasant, men like Slim can assure it will be fair, even if that means hurting some people. Slim’s keen sense of how things should be done isn’t too caught up in ethics, nor is it too sentimental. He just understands what should be and what shouldn’t be, and he seems to dictate according to the natural order, which is comforting to the men when so much of the world seems order-less, without rhyme or reason.