Final answer:
Harper Lee based the character Dill in 'To Kill a Mockingbird' on her childhood friend, the renowned author Truman Capote.
Step-by-step explanation:
The character Dill in Harper Lee's novel To Kill a Mockingbird was based on the author's childhood friend, Truman Capote. Lee and Capote were neighbors and close friends in their youth, and Lee drew upon their friendship in creating the character of Dill. Capote was an American novelist, screenwriter, playwright, and actor, known for his novella Breakfast at Tiffany's and his true crime novel In Cold Blood. Just as Dill is described in the novel, Capote was known for his stories and charisma.