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Allie is Holden's brother that recently died. Allie was a brilliant, friendly, red-headed boy "according to Holden, he was "the smartest of the Caulfield's."" Holden is tormented by Allie's death and carries around a baseball glove on which Allie used to write poems in green ink. .
Jane Gallagher is the girl who recently lived next door to Holden. Holden remembers her as a nice young girl who "always kept her kings in the back row."" This indicates that she is not like all the other phonies who would play to beat the opponent. She is being herself and doing what she wants to do.
Phoebe is Holden's sister that is incredibly intelligent, and Holden thinks she is a perfect model of a non-phony'. Holden knows to "watch her every minute. If you don't think she's smart, you're mad,"" and Phoebe always understands "what the hell your talking about."" Phoebe is Holden's only consistent source of happiness throughout the novel.
All these characters are very significant in Holden's mind. Holden is in-between the chasm of childhood and the adult world and he is having serious trouble negotiating the gap which is leading to a severe emotional breakdown. These characters represent the innocence of childhood. Holden doesn't want them to move into the adult world. He wants them to stay as a child and prevent them from the corruption, the dishonesty, the insincerity and most of all, the cold of the outside world. .
It is interesting to note when Holden realizes that Stadlater is going on a date with Jane and she's waiting outside and Holden doesn't want to see her. "I'm not in the mood right now."" This is because Holden is scared that she has changed and isn't the same Jane that keeps her kings in the back row. She might have lost her innocence and Holden is too afraid to face reality because it is too harsh to face.
What Holden really wants to do is keep all these people in a glass case in a museum. He wanted to keep them in because "everything always stayed right where it was.