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He is a black man who work in the ranch, with the horse. He prefers to stay alone because he is a lonely person and he is the only black man in the ranch.
"Crooks, the negro stable buck, had his bunk in the harness room; a little shed that leaned off the wall of the barn (...) on which his blankets were flung." page 66.

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Candy is an old man who works on the ranch, and he gets attached a lot to things, especially his dog. "He ain't no good to you. Candy. An' he ain't no good to himself." "I had him for so long'. He said proudly,'You wouldn't think it to look at him now, but he was the best damn sheep dog I ever seen." page 44.  He lost his hand, because of a farm accident, and his dog.

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Carlson is a farm worker who shot Candy's dog, however we that he cared also about Candy's dog because he says that h wishes it would happen to him instead. He didn't do it by pleasure.
"I wish somebody'd shoot me if I got old an' a cripple" page 45.

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Slim is "the prince of the ranch" and is loved by everybody. He is a sweet guy and helps the other, for example when people need to talk about something they need to express, they go see him.
"Slim moved back slightly so the light was not on his face (...) It was Slim'scalm invitation to confidence".page 39.

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"The first man  was small and quick, drak of face, with restless eyes and sharp, strong features. Every part of him was defined: small, strong hands, slender arms, a thin and bony nose. " page 2.
As described in this quote; George seems to be the weak fellow that nobody respects, but he is not. Because of his intelligence, he has the power in his relation with Lennie and always tells him what to do even if he is twice as small as Lennie.

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Lennie is a big and sweet man, with a warm heart such as said in this quote; "A huge man, shapeless of face, with large, pale eyes, with sloping shoulders; and he walked heavily, dragging his feet a little, the way a bear drags his paws. His arms did not swing at his sides, but hung loosely." page 2
Lennie is super close to George even if he slows down the paste of their team, but George keeps patiently waiting for him and being nice to him because he appreciate his company.