How do Jem and Scout meet Dill? How does Scout describe the boy?

Jem and Scout meet Dill when he comes in the summer to his Aunt Rachel's house to stay with her next door to the Finches.' Scout describes Dill as an oddity in looks and in how he is dressed:

Dill was a curiosity. He wore blue linen shorts that buttoned to his shirt, his hair was snow white and stuck to his head like duckfluff; he was a year my senior, but I towered over him....[As he talks] his blue eyes would lighten and darken; his laugh was sudden and happy; he habitually pulled at a cowlick in the center of his forehead.