Douglas Spaulding: The protagonist of the novel, the entire summer is seen mostly through his eyes as a time of joys and sorrows. Douglas is imaginative, fanciful, and occasionally meditative on the state of the world. Most of the time, he aims to have fun as a 12-year-old kid, but sometimes he lapses into philosophical brooding on topics, including life and death, more mature topics than what would be expected of his age. Bradbury has stated that Douglas is based on the childhood version of him, and in fact, "Douglas" is Bradbury's actual middle name, while "Spaulding" is his father's middle name.
Tom Spaulding: Douglas' younger brother, Tom is the more logical and skeptical one, often questioning his brother's seemingly inexplicable actions. Tom is also somewhat more childish and naïve than Douglas, often failing to understand the seriousness of Douglas' thoughts about his life; nonetheless, he often acts as the voice of reason when Douglas' imagination gets the better of him.
Charlie: A friend of Douglas and Tom, Charlie often hangs around with them. Charlie sometimes comments on a situation or on the behavior of other characters. Other than that, he gets little character development and acts as more of a side character for Douglas and Tom's adventures.
