"I'm drawn particularly to stories that evolve out of the character of the protagonist"

This quote by David McCullough suggests that he is particularly thinking about stories that are driven by the character of the protagonist. He thinks that the lead character's character ought to be the main focus of the story, which the plot must be developed from the lead character's character. This suggests that the protagonist's motivations, goals, and worths ought to be the main focus of the story, which the plot should be established from these components. This kind of storytelling enables the reader to become more invested in the lead character and the story, as they can relate to the protagonist's battles and triumphs. It also enables the author to produce a more complicated and fascinating story, as the lead character's character can be checked out in more depth.